10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2017
OR
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from            to

Commission file number 1-33128

ONEBEACON INSURANCE GROUP, LTD.

(Exact name of Registrant as specified in its charter)

Bermuda (State or other jurisdiction of incorporation or organization)	98-0503315 (I.R.S. Employer Identification No.)
605 North Highway 169 Plymouth, Minnesota (Address of principal executive offices)	55441 (Zip Code)

Registrant's telephone number, including area code: (952) 852-2431

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x    No o

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files). Yes x    No o

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer", "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer o	Accelerated filer x	Non-accelerated filer o
		(Do not check if a smaller reporting company)
Smaller reporting company o	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o    No x

As of July 31, 2017, 22,986,618 Class A common shares, par value $0.01 per share, and 71,754,738 Class B common shares, par value $0.01 per share, were outstanding.

ONEBEACON INSURANCE GROUP, LTD.

TABLE OF CONTENTS

		Page
PART I	FINANCIAL INFORMATION
ITEM 1.	Financial Statements
	Consolidated Balance Sheets: As of June 30, 2017 and December 31, 2016	1
	Consolidated Statements of Operations and Comprehensive Income: For the three and six months ended June 30, 2017 and 2016	2
	Consolidated Statements of Common Shareholders' Equity: For the six months ended June 30, 2017 and 2016	3
	Consolidated Statements of Cash Flows: For the six months ended June 30, 2017 and 2016	4
	Notes to Consolidated Financial Statements	5
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	47
	Results of Operations	48
	Liquidity and Capital Resources	61
	Critical Accounting Estimates	66
	Forward-Looking Statements	66
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	66
ITEM 4.	Controls and Procedures	66
PART II	OTHER INFORMATION	67
ITEM 1.	Legal Proceedings	67
ITEM 1A.	Risk Factors	68
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	69
ITEM 6.	Exhibits	69
SIGNATURES		70

PART I.     FINANCIAL INFORMATION

ITEM 1.     FINANCIAL STATEMENTS

ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED BALANCE SHEETS

($ in millions, except per share amounts)	June 30, 2017			December 31, 2016
Assets	(Unaudited)
Investment Securities:
Fixed maturity investments, at fair value (amortized cost: $2,269.8 in 2017 and $2,164.4 in 2016)	$	2,288.6		$	2,169.1
Short-term investments, at amortized cost (which approximates fair value)	55.5			112.1
Common equity securities, at fair value (cost: $183.8 in 2017 and $182.3 in 2016)	205.5			188.7
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	134.1			150.5
Total investment securities	2,683.7			2,620.4
Cash	71.3			69.6
Reinsurance recoverables	198.0			179.5
Premiums receivable	245.4			228.3
Deferred acquisition costs	106.9			96.3
Ceded unearned premiums	56.6			44.2
Net deferred tax asset	130.1			126.7
Investment income accrued	12.9			11.3
Accounts receivable on unsettled investment sales	5.8			1.4
Other assets	185.7			212.2
Total assets	$	3,696.4		$	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves	$	1,411.2		$	1,365.6
Unearned premiums	595.2			575.1
Funds held under insurance contracts	210.2			153.0
Debt	273.3			273.2
Accounts payable on unsettled investment purchases	9.3			—
Other liabilities	182.4			197.8
Total liabilities	2,681.6			2,564.7
OneBeacon's common shareholders' equity and noncontrolling interests
OneBeacon's common shareholders' equity
Preference shares (Par value $0.01; 80,000,000 authorized shares; none issued or outstanding)	—			—
Common shares and paid-in surplus (Class A: par value $0.01; 200,000,000 authorized shares; 22,986,618 and 22,592,731 issued and outstanding)(Class B: par value $0.01; 200,000,000 authorized shares; 71,754,738 issued and outstanding for both periods)	1,014.5			1,013.2
Retained earnings	4.5			12.3
Accumulated other comprehensive loss (AOCL)	(3.9		)	(4.2		)
Total OneBeacon's common shareholders' equity	1,015.1			1,021.3
Total noncontrolling interests	(0.3		)	3.9
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,014.8			1,025.2
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$	3,696.4		$	3,589.9

See Notes to Consolidated Financial Statements.

1

ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

(Unaudited)

	Three months ended June 30,						Six months ended June 30,
($ in millions, except per share amounts)	2017			2016			2017			2016
Revenues
Earned premiums	$	277.4		$	271.4		$	539.2		$	550.0
Net investment income	14.5			12.1			26.7			26.5
Net realized and change in unrealized investment gains	12.3			24.7			27.3			41.3
Net other revenues	2.1			0.8			5.5			1.7
Total revenues	306.3			309.0			598.7			619.5
Expenses
Loss and loss adjustment expenses	188.6			179.7			339.2			338.5
Policy acquisition expenses	48.4			48.7			93.7			99.7
Other underwriting expenses	59.6			50.9			111.3			106.2
General and administrative expenses	8.8			3.5			13.8			7.4
Interest expense	3.3			3.2			6.6			6.5
Total expenses	308.7			286.0			564.6			558.3
Pre-tax income (loss)	(2.4		)	23.0			34.1			61.2
Income tax (expense) benefit	2.7			2.0			(1.2		)	10.7
Net income, including noncontrolling interests	0.3			25.0			32.9			71.9
Less: Net income attributable to noncontrolling interests	(0.4		)	(0.5		)	(0.9		)	(1.0		)
Net income (loss) attributable to OneBeacon's common shareholders	(0.1		)	24.5			32.0			70.9
Other comprehensive income, net of tax	0.2			0.2			0.3			0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	0.1		$	24.7		$	32.3		$	71.1
Earnings per share attributable to OneBeacon's common shareholders—basic and diluted
Net income attributable to OneBeacon's common shareholders per share	$	—		$	0.26		$	0.34		$	0.75
Dividends declared and paid per OneBeacon's common share	$	0.21		$	0.21		$	0.42		$	0.42

See Notes to Consolidated Financial Statements.

2

ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY

(Unaudited)

			OneBeacon's Common Shareholders' Equity															Total OneBeacon's common shareholders' equity and noncontrolling interests
($ in millions)	Common shares  outstanding		Common shares and paid-in surplus			Retained earnings			AOCL			Total OneBeacon common shareholders' equity			Noncontrolling interests, after tax
Balances at January 1, 2017	94,347,469		$	1,013.2		$	12.3		$	(4.2	)	$	1,021.3		$	3.9		$	1,025.2
Comprehensive income:
Net income	—		—			32.0			—			32.0			0.9			32.9
Other comprehensive income, net of tax	—		—			—			0.3			0.3			—			0.3
Total comprehensive income	—		—			32.0			0.3			32.3			0.9			33.2
Amortization of restricted share awards	—		2.4			—			—			2.4			—			2.4
Issuance of common shares	461,160		—			—			—			—			—			—
Repurchase and retirement of common shares	(67,273	)	(1.1		)	—			—			(1.1		)	(4.1		)	(5.2		)
Dividends	—		—			(39.8		)	—			(39.8		)	(1.0		)	(40.8		)
Balances at June 30, 2017	94,741,356		$	1,014.5		$	4.5		$	(3.9	)	$	1,015.1		$	(0.3	)	$	1,014.8

			OneBeacon's Common Shareholders' Equity															Total OneBeacon's common shareholders' equity and noncontrolling interests
($ in millions)	Common  shares outstanding		Common shares and paid-in surplus			Retained earnings			AOCL			Total OneBeacon common shareholders' equity			Noncontrolling interests, after tax
Balances at January 1, 2016	95,089,240		$	1,022.0		$	(15.9	)	$	(5.2	)	$	1,000.9		$	3.6		$	1,004.5
Comprehensive income:
Net income	—		—			70.9			—			70.9			1.0			71.9
Other comprehensive income, net of tax	—		—			—			0.2			0.2			—			0.2
Total comprehensive income	—		—			70.9			0.2			71.1			1.0			72.1
Amortization of restricted share awards	—		1.3			—			—			1.3			—			1.3
Issuance of common shares	173,559		—			—			—			—			0.1			0.1
Repurchase and retirement of common shares	(915,330	)	(11.5		)	—			—			(11.5		)	—			(11.5		)
Dividends			—			(39.6		)	—			(39.6		)	(1.0		)	(40.6		)
Balances at June 30, 2016	94,347,469		$	1,011.8		$	15.4		$	(5.0	)	$	1,022.2		$	3.7		$	1,025.9

   See Notes to Consolidated Financial Statements.

3

ONEBEACON INSURANCE GROUP, LTD.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Six months ended June 30,
($ in millions)	2017			2016
Cash flows from operations:
Net income including noncontrolling interests	$	32.9		$	71.9
Charges (credits) to reconcile net income to cash flows provided from operations:
Net realized and change in unrealized investment gains	(27.3		)	(41.3		)
Deferred income tax (benefit) expense	(2.6		)	19.2
Other operating items:
Net change in loss and LAE reserves	45.6			(13.2		)
Net change in unearned premiums	20.1			(3.9		)
Net change in ceded unearned premium	(12.4		)	(5.0		)
Net change in premiums receivable	(17.1		)	(19.9		)
Net change in reinsurance recoverables on paid and unpaid losses	(18.5		)	10.0
Net change in funds held under insurance contracts	57.2			3.2
Net change in other assets and liabilities	8.3			(38.3		)
Net cash provided from (used for) operations	86.2			(17.3		)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	56.6			(45.4		)
Maturities of fixed maturity investments	158.6			229.5
Sales of fixed maturity investments	686.1			200.5
Sales of common equity securities	5.8			174.4
Return of capital and distributions of other investments	13.5			7.0
Purchases of fixed maturity investments	(957.9		)	(449.4		)
Purchases of common equity securities	(6.2		)	(109.5		)
Contributions for other investments	(0.9		)	(0.4		)
Net change in unsettled investment purchases and sales	4.8			42.5
Acquisitions of property and equipment	(4.0		)	(2.1		)
Net cash (used for) provided from investing activities	(43.6		)	47.1
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.8		)	(39.6		)
Repurchases and retirements of common stock	(1.1		)	(11.5		)
Payments on capital lease obligation	—			(1.0		)
Net cash used for financing activities	(40.9		)	(52.1		)
Net increase (decrease) in cash during period	1.7			(22.3		)
Cash balance at beginning of period	69.6			95.2
Cash balance at end of period	$	71.3		$	72.9

  See Notes to Consolidated Financial Statements.

4

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1. Nature of Operations and Summary of Significant Accounting Policies

Basis of presentation

These interim consolidated financial statements include the accounts of OneBeacon Insurance Group, Ltd. (the "Company" or the "Registrant") and its subsidiaries (collectively, "OneBeacon") and have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). The Company is an exempted Bermuda limited liability company with U.S.-based underwriting operating companies that are property and casualty insurance writers and a Bermuda-based reinsurance company, Split Rock Insurance, Ltd. ("Split Rock"). OneBeacon offers a wide range of specialty insurance products and services primarily through independent agencies, regional and national brokers, wholesalers and managing general agencies.

OneBeacon is 75.7% owned by White Mountains Insurance Group, Ltd. ("White Mountains"), a holding company whose businesses provide property and casualty insurance, reinsurance and certain other products. The Company's headquarters are located at 26 Reid Street, Hamilton HM 11, Bermuda. The Company's U.S. corporate headquarters are located at 605 North Highway 169, Plymouth, Minnesota 55441 and its registered office is located at Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

On May 2, 2017, Intact Financial Corporation (“Intact”), which is based in Toronto, Ontario, Canada and is the largest provider of property and casualty insurance in Canada, and the Company announced that they had entered into a definitive merger agreement ("Merger Agreement") which provides for the merger of an indirect subsidiary of Intact with and into the Company, following the satisfaction of various closing conditions, including approval by the Company’s shareholders and approval by applicable insurance regulatory authorities (the “OneBeacon Acquisition”). See Note 2—"OneBeacon Acquisition".

OneBeacon's reportable segments are Specialty Products, Specialty Industries and Investing, Financing and Corporate. The Specialty Products segment is comprised of ten active underwriting operating segments, representing an aggregation based on those that offer distinct products and tailored coverages and services to a broad customer base across the United States. The Specialty Industries segment is comprised of six active underwriting operating segments, representing an aggregation based on those that focus on solving the unique needs of a particular customer or industry group. The Investing, Financing and Corporate segment includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through the Company and its intermediate holding company subsidiaries. See Note 7—"Segment Information" for changes to underwriting operating and reportable segments during the three months ended March 31, 2017. Prior periods have been restated to conform to the current presentation of segment information.

All significant intercompany transactions have been eliminated in consolidation. These interim financial statements include all adjustments considered necessary by management to fairly state the financial position, results of operations and cash flows of OneBeacon. These interim financial statements may not be indicative of financial results for the full year and should be read in conjunction with the Company’s 2016 Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission (the "SEC") on February 27, 2017. The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Refer to the Company’s 2016 Annual Report on Form 10-K for a complete discussion regarding OneBeacon’s significant accounting policies. Certain amounts in the prior period financial statements have been reclassified to conform to the current presentation.

Derivatives

During 2017, OneBeacon began purchasing foreign currency forward contracts in order to provide an economic hedge against fluctuations in certain foreign-denominated fixed maturity securities that were purchased during the same time period. These foreign currency forward contracts are considered derivative financial instruments and they have not been designated or accounted for under hedge accounting. OneBeacon recognizes these derivatives as either assets or liabilities, measured at fair value, in the consolidated balance sheets. Changes in the fair value of derivative instruments, or realized gains and losses from the sale or maturity of the forward contracts, are recognized as components of investment results in current period pre-tax income.

5

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 1. Nature of Operations and Summary of Significant Accounting Policies

Recently Adopted Changes in Accounting Principles

Stock Compensation

Effective January 1, 2017, OneBeacon adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (ASC 718) which simplifies certain aspects of the accounting for share-based compensation. The new guidance provides an accounting policy election to account for forfeitures by either applying an assumption, as required under existing guidance, or by recognizing forfeitures when they actually occur. At adoption, OneBeacon did not change its accounting policy for forfeitures, which is to apply an assumed forfeiture rate. The new guidance has also changed the threshold for partial cash settlement to settle statutory withholding requirements for equity classified awards, increasing the threshold up to the maximum statutory tax rate.

In addition, the new guidance changed the treatment for excess tax benefits which arise from the difference between the deduction for tax purposes and the compensation costs recognized for financial reporting. Previously, excess tax benefits were recognized through other comprehensive income. Under the new guidance, OneBeacon will recognize excess tax benefits or expense in current period earnings.

Short-Duration Contracts

Effective December 31, 2016, OneBeacon adopted ASU 2015-09, Disclosures about Short Duration Contracts (ASC 944) which requires expanded footnote disclosures about loss and loss adjustment expense ("LAE") reserves. Upon adoption, OneBeacon modified its disclosures in the Company's 2016 Annual Report on Form 10-K to include loss development tables on a disaggregated basis by accident year and a reconciliation of loss development data to the loss and LAE reserves reflected on the balance sheet. The footnote disclosures were also expanded to include information about claim frequency data, including a description of how the claims frequency data is measured. Prior year disclosures were modified to conform to the new disclosures. There was no impact upon adoption to the financial statements contained herein as OneBeacon was already disclosing the new required loss rollforward. See Note 3—"Unpaid Loss and Loss Adjustment Expense (LAE) Reserves".

Recently Issued Accounting Pronouncements

Cash Flow Statement

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (ASC 230), which addresses the classification and presentation of certain items, including debt prepayment and extinguishment costs, contingent consideration payments made after a business combination and distributions received from equity method investees, for which there was diversity in practice.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash (ASC230). Under current guidance, restricted amounts of cash or cash equivalents are excluded from the cash flow statement. The new guidance requires restricted cash and restricted cash equivalents to be included in the reconciliation of beginning and end-of-period amounts presented on the statement of cash flows. In addition, the new guidance requires a description of the nature of the changes in restricted cash and cash equivalents during the periods presented.

The updated guidance in ASU 2016-15 and ASU 2016-18 are both effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. OneBeacon does not expect the adoption of this guidance to have a material impact on its consolidated statement of cash flows.

Credit Losses

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (ASC 326), which establishes new guidance for the recognition of credit losses for financial assets measured at amortized cost. The new ASU, which applies to financial assets that have the contractual right to receive cashrequires reporting entities to estimate the credit losses expected over the life of a credit exposure using historical information, current information, and reasonable and supportable forecasts that affect the collectability of the financial asset. The types of assets included in the scope of the new guidance includes premium receivables, reinsurance recoverables, and loans. ASU 2016-13 is effective for annual periods beginning after January 1, 2020, including interim periods. OneBeacon measures financial assets at fair value with changes therein recognized in current period earnings and accordingly, does not expect adoption to have a significant impact on its financial statements.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (ASC 842). The new guidance requires lessees to recognize lease assets and liabilities on the balance sheet for both operating and financing leases, with the exception of leases with an

6

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 1. Nature of Operations and Summary of Significant Accounting Policies

original term of 12 months or less. Under existing guidance recognition of lease assets and liabilities is not required for operating leases. The lease assets and liabilities to be recognized are both measured initially based on the present value of the lease payments. Under the new guidance, a sale-leaseback transaction must meet the recognition criteria under ASC 606, Revenues in order to be accounted for as a sale. The new guidance is effective for OneBeacon for years beginning after December 15, 2018, including interim periods therein. OneBeacon is evaluating the expected impact of this new guidance and available adoption methods.

Financial Instruments - Recognition and Measurement

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASC 825-10). The new ASU modifies the guidance for financial instruments, including investments in equity securities. Under the new guidance, all equity securities with readily determinable fair values are required to be measured at fair value with changes therein recognized through current period earnings. In addition, the new ASU requires a qualitative assessment for equity securities without readily determinable fair values to identify impairment, and for impaired equity securities to be measured at fair value. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017, with early adoption permitted. OneBeacon measures its portfolio of investment securities at fair value with changes therein recognized through current period earnings accordingly, does not expect the adoption of ASU 2016-01 to have a significant impact on its financial statements.

Stock Compensation

In May 2017, the FASB issued ASU 2017-09, Stock Compensation: Scope of Modification Accounting (ASC 718), which narrows the scope of transactions subject to modification accounting to changes in terms of an award that result in a change in the award's fair value, vesting conditions, or classification. ASU 2017-09 is effective for fiscal years beginning after December 15, 2017. OneBeacon does not expect the adoption of this guidance to have a material impact on its financial statements.

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASC 606), which modifies the guidance for revenue recognition. Under ASU 2014-09, revenue is to be recognized at an amount that reflects the consideration to which an entity expects to be entitled in exchange for goods and services transferred to customers. The new guidance sets forth the steps to be followed to recognize revenue: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the entity satisfies a performance obligation. Subsequently, the FASB issued additional ASUs clarifying the guidance in and providing implementation guidance for ASU 2014-09.In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (ASC 606),which delays the effective date of ASU 2014-09 and all related ASUs to annual and interim periods beginning after December 15, 2017. Most of OneBeacon's revenue from customer relates to insurance contracts, which are excluded from the scope of ASU 2014-09, as are investment income and investment gains and losses. However, the new guidance is applicable to some of OneBeacon's revenue streams, including certain fee arrangements as well as commissions and other non-insurance revenues. OneBeacon is evaluating the new guidance, but does not expect ASU 2014-09 to have a significant effect on recognition of OneBeacon's non-insurance revenues from customers.

NOTE 2. OneBeacon Acquisition

As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies", on May 2, 2017, Intact and the Company announced the OneBeacon Acquisition. The subsidiaries of White Mountains Insurance Group, Ltd. that own the Company's common stock have executed a voting agreement in support of the OneBeacon Acquisition. Under the terms of the Merger Agreement, which has been approved by the board of directors of both companies, the Company’s shareholders will be entitled to receive $18.10 for each outstanding share of the Company’s common stock. Aggregate cash consideration to Company shareholders is anticipated to be approximately $1.7 billion. The OneBeacon Acquisition is expected to be completed in the third quarter or early in the fourth quarter of 2017.

The closing of the OneBeacon Acquisition is subject to the satisfaction of various closing conditions, including the approval by the Company’s shareholders, which occurred on July 18, 2017, as well as the approval of various insurance regulatory authorities and other closing conditions customary for a transaction of this type. Pursuant to the Merger Agreement, the Company is required to carry on its business in the ordinary course consistent with past practice, in all material respects; however, certain actions are restricted or may not be taken without Intact's prior written consent.

7

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 3. Unpaid Loss and Loss Adjustment Expense (LAE) Reserves

Loss and LAE reserve summary

The following table summarizes the loss and LAE reserve activities of OneBeacon's insurance subsidiaries for the three and six months ended June 30, 2017 and 2016:

	Three months ended  June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Gross beginning balance	$	1,368.8		$	1,343.8		$	1,365.6		$	1,389.8
Less beginning reinsurance recoverables on unpaid losses	(174.7		)	(150.4		)	(172.9		)	(186.0		)
Net beginning loss and LAE reserves	1,194.1			1,193.4			1,192.7			1,203.8
Loss and LAE incurred relating to:
Current year losses	181.3			164.3			331.9			323.1
Prior year losses	7.3			15.4			7.3			15.4
Total incurred loss and LAE	188.6			179.7			339.2			338.5
Loss and LAE paid relating to:
Current year losses	(36.4		)	(37.1		)	(57.7		)	(59.1		)
Prior year losses	(132.1		)	(122.2		)	(260.0		)	(269.4		)
Total loss and LAE payments	(168.5		)	(159.3		)	(317.7		)	(328.5		)
Net ending loss and LAE reserves	1,214.2			1,213.8			1,214.2			1,213.8
Plus ending reinsurance recoverables on unpaid losses	197.0			162.8			197.0			162.8
Gross ending loss and LAE reserves	$	1,411.2		$	1,376.6		$	1,411.2		$	1,376.6

Loss and LAE development

Loss and LAE development—2017

During the three months ended June 30,2017, OneBeacon experienced $7.3 million net unfavorable loss and LAE reserve development on prior accident year reserves driven by Programs. The unfavorable development in Programs was driven by increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs.

During the six months ended June 30,2017, OneBeacon experienced $7.3 million net loss and LAE reserve development on prior accident year reserves as unfavorable reserve development, primarily in Healthcare due to an adverse settlement on a single managed care errors and omissions claim, and in Programs driven by increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs, with the unfavorable development partially offset by favorable reserve development driven in part by Technology and Accident & Health resulting from favorable loss experience.

Loss and LAE development—2016

During both the three and six months ended June 30, 2016, OneBeacon experienced $15.4 million net unfavorable loss and LAE reserve development on prior accident year reserves. During the three months ended June 30, 2016, the Healthcare operating segment recorded $24.0 million of net unfavorable loss reserve development as a result of increasing claim frequency, as well as higher than expected paid and case activity, most notably within the senior living sub-line, which provides medical malpractice and general liability insurance for extended care facilities, including assisted living, memory care and continuing care facilities. As a result of the continuing loss activity experienced in this sub-line, we performed an in-depth claim file review, which confirmed that the increased case incurred loss activity was driven by frequency, especially in the more recent prior accident years, as opposed to other potential considerations such as changes in claims-handling practices. In addition, a thorough actuarial review was completed, including analysis of the results of enhancements made to the predictive model deployed in the senior living sub-line. Adverse financial results were primarily observed in high-risk categories of business and in difficult geographic venues identified by the predictive model data. As a result of these analyses, management increased its best estimate of prior accident year losses during the prior year period, and increased its loss provisions for the current accident year based on the updated actuarial indications. In addition, also within the Healthcare operating segment, there were two large claims within the managed care errors and omissions sub-line related to unexpected outcomes from mediation and extended costs associated with claim defense, which contributed to the unfavorable development in prior accident years. In the six months ended June 30, 2016, Healthcare recorded $34.8 million of adverse prior year development, which included prior year

8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 3. Unpaid Loss and Loss Adjustment Expense (LAE) Reserves

loss activity recorded in the first quarter of 2016 in the complex risk sub-line, which provides professional liability coverage to hospitals, physicians, and physician groups as well as physicians' extended reporting period coverage.

In addition to Healthcare, but to a lesser extent, Programs also experienced unfavorable development during the three months ended June 30,2016 primarily as a result of two larger auto-related programs; the total unfavorable development in Healthcare and Programs, along with a few other businesses, was partially offset by favorable development in Financial Services and several other businesses.

During the six months ended June 30,2016, net unfavorable development was driven by Healthcare. In addition, to a lesser extent, unfavorable development in Programs and a few other businesses, was partially offset by favorable development in Technology, Financial Services and Accident, as well as other businesses.

NOTE 4. Reinsurance

In the normal course of business, OneBeacon's insurance subsidiaries seek to limit losses that may arise from catastrophes or other events by reinsuring with third-party reinsurers. OneBeacon remains liable for risks reinsured even if the reinsurer does not honor its obligations under reinsurance contracts.

Reinsurance Treaties

The Company's reinsurance coverage is discussed in Note 4—"Reinsurance" in the Company's 2016 Annual Report on Form 10-K. All of the Company's expiring reinsurance treaties were renewed during the three months ended June 30, 2017 with terms that were substantially similar to those reported in the 2016 Annual Report on Form 10-K.

Reinsurance Recoverables

As of June 30, 2017, OneBeacon had reinsurance recoverables on paid losses of $1.0 million and reinsurance recoverables on unpaid losses of $197.0 million. As reinsurance contracts do not relieve OneBeacon of its obligations, collectibility of balances due from reinsurers is important to OneBeacon's financial strength. The following table summarizes A.M. Best Company, Inc. ("A.M. Best") ratings for OneBeacon's reinsurers, excluding industry pools and associations, based upon reinsurance recoverable amounts on paid and unpaid losses and LAE:

	Balance at June 30, 2017		% of total
A.M.Best's Rating(1):	($ in millions)
A+ or better	$	85.9	43	%
A- to A	83.4		42	%
B, Not Rated and Other(2)	28.7		15	%
Total reinsurance recoverables	$	198.0	100	%

_______________________________________________________________________________

⁽¹⁾ A.M. Best's ratings as detailed above are "A+ or better" (Superior), "A- to A" (Excellent) and "B" (Fair).

⁽²⁾ Includes reinsurance recoverable on unpaid losses from Bedivere Insurance Company ("Bedivere"), one of the legal entities transferred as part of the runoff transaction in 2014, of $17.2 million.

NOTE 5. Investment Securities

OneBeacon's invested assets are comprised of securities and other investments held for general investment purposes. Refer to the Company's 2016 Annual Report on Form 10-K for a complete discussion.

OneBeacon classifies its portfolio of fixed maturity investments, common equity securities, including exchange traded funds ("ETFs"), and other investments held for general investment purposes, as trading securities. Trading securities are reported at fair value as of the balance sheet date as determined by quoted market prices when available. Realized and changes in unrealized investment gains on trading securities are reported, on a pre-tax basis, in revenues as net realized and change in unrealized investment gains.

Short-term investments consist of interest-bearing money market funds and other securities which, at the time of purchase, mature or become available for use within one year. Short-term investments are carried at amortized cost, which approximates fair value.

9

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Other investments consist primarily of surplus notes, hedge funds and private equity funds. Surplus notes provided in conjunction with the financing of the sale of the run-off business in 2014 are measured at estimated fair value based on a discounted expected cash flow model, with changes in fair value reported in total revenues as net realized and change in unrealized investment gains. OneBeacon measures its investments in hedge funds and private equity funds at fair value with changes therein reported in total revenues as net realized and change in unrealized investment gains. Other investments also include an investment in a community reinvestment vehicle which is accounted for at fair value, with changes in fair value reported in total revenues as net realized and change in unrealized investment gains, a tax advantaged federal affordable housing development fund, which is accounted for under the proportional amortization method, and beginning in the first quarter of 2017, a foreign currency forward contract which is accounted for at fair value, with changes in fair value reported in total revenues as net realized and change in unrealized investment gains.

OneBeacon's net investment income is comprised primarily of interest income associated with OneBeacon's fixed maturity investments and short-term investments and dividend income from its common equity securities and other investments.

Net investment income for the three and six months ended June 30, 2017 and 2016 consisted of the following:

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Fixed maturity investments	$	14.1		$	12.2		$	26.7		$	24.3
Short-term investments	0.1			0.1			0.2			0.1
Common equity securities	0.9			0.5			1.7			1.5
Other investments(1)	0.4			0.5			0.4			3.0
Gross investment income	15.5			13.3			29.0			28.9
Less investment expenses	(1.0		)	(1.2		)	(2.3		)	(2.4		)
Net investment income, pre-tax	$	14.5		$	12.1		$	26.7		$	26.5

_______________________________________________________________________________

⁽¹⁾ Includes an interest payment on the surplus notes of $2.4 million received in the six months ended June 30, 2016.

The composition of net realized investment gains and losses consisted of the following:

	Three months ended  June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Fixed maturity investments	$	0.8		$	0.4		$	(0.3	)	$	(1.0	)
Common equity securities	0.7			3.7			1.0			(1.0		)
Other investments	(1.0		)	(3.0		)	0.2			(2.8		)
Net realized investment gains (losses), pre-tax	$	0.5		$	1.1		$	0.9		$	(4.8	)

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

The net changes in net unrealized gains for the three and six months ended June 30, 2017 and 2016 are as follows:

	Three months ended June 30, 2017								Six months ended June 30, 2017
($ in millions)	Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in unrealized gains reflected in revenues			Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in fair value reflected in revenues
Fixed maturity investments	$	4.8		$	1.9	$	6.7		$	12.1		$	2.0	$	14.1
Common equity securities	5.2			—		5.2			15.3			—		15.3
Other investments	(0.1		)	—		(0.1		)	(3.0		)	—		(3.0		)
Net change, pre-tax	$	9.9		$	1.9	$	11.8		$	24.4		$	2.0	$	26.4

	Three months ended June 30, 2016								Six months ended June 30, 2016
($ in millions)	Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in unrealized gains reflected in revenues			Changes in net unrealized investment gains		Changes in net foreign currency gains (losses)		Total net changes in fair value reflected in revenues
Fixed maturity investments	$	12.0		$	—	$	12.0		$	27.0	$	—	$	27.0
Common equity securities	(5.4		)	—		(5.4		)	4.3		—		4.3
Other investments	17.0			—		17.0			14.8		—		14.8
Net change, pre-tax	$	23.6		$	—	$	23.6		$	46.1	$	—	$	46.1

The components of OneBeacon's ending net unrealized investment gains and losses, excluding the impact of net unrealized foreign currency translation gains and losses, on its investment portfolio as of June 30, 2017 and December 31, 2016 were as follows:

($ in millions)	June 30, 2017			December 31, 2016
Investment securities:
Gross unrealized investment gains	$	72.2		$	52.7
Gross unrealized investment losses	(7.1		)	(12.0		)
Total net unrealized investment gains, pre-tax	65.1			40.7
Income taxes	(20.4		)	(14.0		)
Total net unrealized investment gains, after-tax	$	44.7		$	26.7

The cost or amortized cost, gross unrealized pre-tax investment gains and losses, net foreign currency gains and losses and carrying values of OneBeacon's fixed maturity investments as of June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
U.S. Government and agency obligations	$	56.0	$	—	$	(0.3	)	$	—	$	55.7
Debt securities issued by corporations	892.7		9.6		(0.7		)	2.0		903.6
Municipal obligations	69.7		1.3		(0.4		)	—		70.6
Mortgage and asset-backed securities	1,238.8		3.7		(2.4		)	—		1,240.1
Foreign government obligations	4.3		0.1		—			—		4.4
Preferred stocks	8.3		5.9		—			—		14.2
Total fixed maturity investments	$	2,269.8	$	20.6	$	(3.8	)	$	2.0	$	2,288.6

11

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

	December 31, 2016
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
U.S. Government and agency obligations	$	169.6	$	—	$	(2.3	)	$	—	$	167.3
Debt securities issued by corporations	760.6		6.2		(3.7		)	—		763.1
Municipal obligations	70.1		0.8		(0.4		)	—		70.5
Mortgage and asset-backed securities	1,154.8		1.8		(3.5		)	—		1,153.1
Foreign government obligations	1.0		0.2		—			—		1.2
Preferred stocks	8.3		5.6		—			—		13.9
Total fixed maturity investments	$	2,164.4	$	14.6	$	(9.9	)	$	—	$	2,169.1

The following table summarizes the credit ratings⁽¹⁾ of the debt securities issued by corporations owned by OneBeacon as of June 30, 2017 and December 31, 2016:

	at Fair value
($ in millions)	June 30, 2017		December 31, 2016
AA	$	62.6	$	63.7
A	255.7		169.1
BBB	491.4		450.8
BB	87.0		70.8
B	6.9		8.7
Debt securities issued by corporations	$	903.6	$	763.1

_______________________________________________________________________________

⁽¹⁾ Credit ratings are assigned based on the following hierarchy: 1) Standard and Poor’s Financial Services LLC (“Standard and Poor’s”) and 2) Moody’s Investor Service (“Moody’s”).

The cost or amortized cost, gross unrealized pre-tax investment gains and losses, net unrealized pre-tax foreign currency gains and losses and carrying values of common equity securities and other investments as of June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
Common equity securities	$	183.8	$	22.5	$	(0.8	)	$	—	$	205.5
Other investments	107.5		29.1		(2.5		)	—		134.1
Total common equity securities and other investments	$	291.3	$	51.6	$	(3.3	)	$	—	$	339.6

12

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

	December 31, 2016
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
Common equity securities	$	182.3	$	6.9	$	(0.5	)	$	—	$	188.7
Other investments	120.9		31.2		(1.6		)	—		150.5
Total common equity securities and other investments	$	303.2	$	38.1	$	(2.1	)	$	—	$	339.2

As of June 30, 2017 and December 31, 2016, the Company held unrestricted collateral from its customers, primarily relating to its surety business, of $210.2 million and $153.0 million, respectively, which is included in cash and invested assets. The obligation to return these funds is classified as funds held under insurance contracts in the consolidated balance sheets.

Fair value measurements

Fair value measurements are categorized into a hierarchy that distinguishes between inputs based on market data from independent sources ("observable inputs") and a reporting entity's internal assumptions based upon the best information available when external market data is limited or unavailable ("unobservable inputs"). Quoted prices in active markets for identical assets or liabilities have the highest priority ("Level 1"), followed by observable inputs other than quoted prices, including prices for similar but not identical assets or liabilities ("Level 2") with unobservable inputs, including the reporting entity's estimates of the assumptions that market participants would use, having the lowest priority ("Level 3"). As of both June 30, 2017 and December 31, 2016, approximately 95% of the investment portfolio recorded at fair value was priced based upon observable inputs.

Investments valued using Level 1 inputs include fixed maturity investments, primarily investments in U.S. Treasuries, common equity securities and short-term investments, which include U.S. Treasury Bills. Investments valued using Level 2 inputs are comprised primarily of fixed maturity investments, which have been disaggregated into classes, including debt securities issued by corporations, municipal obligations, mortgage and asset-backed securities, foreign government obligations and preferred stocks. Certain ETFs that track U.S. stock indices such as the S&P 500 but are traded on foreign exchanges are also considered Level 2 measurements, as management values such investments using the fund's published net asset value ("NAV") to account for the difference in market close times. Fair value estimates for investments that trade infrequently and have few or no observable market prices are classified as Level 3 measurements. Level 3 fair value estimates based upon unobservable inputs include OneBeacon's investments in surplus notes and certain fixed maturity investments and common equity securities where quoted market prices are unavailable or are not considered reasonable. OneBeacon determines when transfers between levels have occurred as of the beginning of the period.

OneBeacon uses brokers and outside pricing services to assist in determining fair values. For investments in active markets, OneBeacon uses the quoted market prices provided by outside pricing services to determine fair value. The outside pricing services used by OneBeacon have indicated that if no observable inputs are available for the security, they will not provide a price. In such circumstances, where quoted market prices are unavailable or are not considered reasonable, OneBeacon estimates the fair value using industry standard pricing methodologies and observable inputs such as benchmark yields, reported trades, broker-dealer quotes, issuer spreads, benchmark securities, bids, offers, prepayment speeds, reference data including research publications and other relevant inputs. Given that many fixed maturity investments do not trade on a daily basis, the outside pricing services evaluate a wide range of fixed maturity investments by regularly drawing parallels from recent trades and quotes of comparable securities with similar features. The characteristics used to identify comparable fixed maturity investments vary by asset type and take into account market convention.

OneBeacon's process to assess the reasonableness of the market prices obtained from the outside pricing sources covers substantially all of its fixed maturity investments and includes, but is not limited to, the evaluation of pricing methodologies and a review of the pricing services' quality control processes and procedures on at least an annual basis, comparison of our invested asset market prices to prices obtained from different independent pricing vendors on at least a semi-annual basis, monthly analytical reviews of certain prices and review of the underlying assumptions utilized by our pricing services for selected measurements on an ad hoc basis throughout the year. OneBeacon also performs back-testing of selected sales activity to determine whether there are any significant differences between the market price used to value the security prior to sale and the actual sale price on an ad-hoc basis throughout the year. Prices provided by the pricing services that vary by more than 5% and $1.0 million from the expected price based on these procedures are considered outliers. Also considered outliers are prices that have not changed from period to period and prices that have trended unusually compared to market conditions. In

13

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

circumstances where the results of OneBeacon's review process do not appear to support the market price provided by the pricing services, OneBeacon challenges the price. If OneBeacon cannot gain satisfactory evidence to support the challenged price, it relies upon its own pricing methodologies to estimate the fair value of the security in question.

The valuation process above is generally applicable to all of OneBeacon’s fixed maturity investments. The techniques and inputs specific to asset classes within OneBeacon's fixed maturity investments for Level 2 securities that use observable inputs are as follows:

Debt securities issued by corporations: The fair value of debt securities issued by corporations is determined from a pricing evaluation technique that uses information from market sources and integrates relative credit information, observed market movements, and sector news. Key inputs include benchmark yields, reported trades, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including sector, coupon, credit quality ratings, duration, credit enhancements, early redemption features and market research publications.

Municipal obligations: The fair value of municipal obligations is determined from a pricing evaluation technique that uses information from market makers, broker-dealers, buy-side firms, and analysts along with general market information. Key inputs include benchmark yields, reported trades, issuer financial statements, material event notices and new issue data, as well as broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including type, coupon, credit quality ratings, duration, credit enhancements, geographic location and market research publications.

Mortgage and asset-backed securities: The fair value of mortgage and asset-backed securities is determined from a pricing evaluation technique that uses information from market sources and leveraging similar securities. Key inputs include benchmark yields, reported trades, underlying tranche cash flow data, collateral performance, plus new issue data, as well as broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including issuer, vintage, loan type, collateral attributes, prepayment speeds, default rates, recovery rates, cash flow stress testing, credit quality ratings and market research publications.

Foreign government obligations: The fair value of foreign government obligations is determined from a pricing evaluation technique that uses feeds from data sources in each respective country, including active market makers and inter-dealer brokers. Key inputs include benchmark yields, reported trades, broker-dealer quotes, two-sided markets, benchmark securities, bids, offers, local exchange prices, foreign exchange rates and reference data including coupon, credit quality ratings, duration and market research publications.

Preferred stocks: The fair value of preferred stocks is determined from a pricing evaluation technique that calculates the appropriate spread over a comparable security for each issue. Key inputs include exchange prices (underlying and common stock of same issuer), benchmark yields, reported trades, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including sector, coupon, credit quality ratings, duration, credit enhancements, early redemption features and market research publications.

Level 3 valuations are generated from techniques that use assumptions not observable in the market. These unobservable assumptions reflect OneBeacon's assumptions that market participants would use in valuing the investment. Generally, certain securities may start out as Level 3 when they are originally issued but as observable inputs become available in the market, they may be reclassified to Level 2.

The fair value of the surplus notes is determined based on a discounted expected cash flow model using information as of the measurement date, and is classified as a Level 3 measurement. OneBeacon’s other investments also include an investment in a community reinvestment vehicle and a foreign currency forward contract, which are accounted for at fair value, and a tax advantaged federal affordable housing development fund, which is accounted for under the proportional amortization method.

The fair values of OneBeacon's investments in hedge funds and private equity funds have been classified as NAV as prescribed by ASU 2015-07. OneBeacon employs a number of procedures to assess the reasonableness of the NAV reported by the fund's manager, including obtaining and reviewing periodic and audited financial statements and discussing each fund’s pricing with the fund manager throughout the year. In the event OneBeacon believes that its estimate of NAV differs from that reported by the fund due to illiquidity or other factors, OneBeacon will adjust the fund's reported NAV to more appropriately represent the fair value of its interest in the investment. As of June 30, 2017 and December 31, 2016, OneBeacon recorded negative adjustments of $1.1 million and $5.0 million, respectively, to the reported NAV of certain investments in hedge funds and private equity funds.

14

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Fair value measurements by level

The following tables summarize the Company's fair value measurements for investments as of June 30, 2017 and December 31, 2016 by level. The major security types were based on the legal form of the securities. OneBeacon has disaggregated its fixed maturity investments based on the issuing entity type, which impacts credit quality, with debt securities issued by U.S. government entities carrying minimal credit risk, while the credit and other risks associated with other issuers, such as corporations, foreign governments, municipalities or entities issuing asset-backed securities vary depending on the nature of the issuing entity type. OneBeacon further disaggregates debt securities issued by corporations and common equity securities by industry sector because investors often reference commonly used benchmarks and their subsectors to monitor risk and performance. Accordingly, OneBeacon has further disaggregated these asset classes into subclasses based on the similar sectors and industry classifications the Company uses to evaluate investment risk and performance against commonly used benchmarks, such as the Bloomberg Barclays U.S. Intermediate Aggregate and S&P 500 indices.

15

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

($ in millions)	Fair value at June 30, 2017		Level 1		Level 2		Level 3
Fixed maturity investments:
U.S. Government and agency obligations	$	55.7	$	55.7	$	—	$	—
Debt securities issued by corporations:
Consumer	187.3		—		187.3		—
Financials	154.9		—		154.9		—
Industrial	141.6		—		140.0		1.6
Health Care	122.3		—		122.3		—
Utilities	81.9		—		81.9		—
Technology	63.8		—		63.8		—
Communications	58.4		—		58.4		—
Basic materials	51.4		—		51.4		—
Energy	42.0		—		42.0		—
Debt securities issued by corporations	903.6		—		902.0		1.6
Municipal obligations	70.6		—		70.6		—
Mortgage and asset-backed securities	1,240.1		—		1,227.4		12.7
Foreign government obligations	4.4		0.6		3.8		—
Preferred stocks	14.2		—		14.2		—
Fixed maturity investments	2,288.6		56.3		2,218.0		14.3
Short-term investments	55.5		55.5		—		—
Common equity securities:
Exchange traded funds(1)	177.9		152.4		25.5		—
Health Care	6.2		6.2		—		—
Financials	5.4		5.4		—		—
Consumer	4.8		4.8		—		—
Communications	3.3		3.3		—		—
Technology	3.3		3.3		—		—
Industrial	3.3		3.3		—		—
Energy	1.3		1.3		—		—
Common equity securities	205.5		180.0		25.5		—
Other investments(2)(3)	84.7		—		—		84.7
Total(1)(2)(3)	$	2,634.3	$	291.8	$	2,243.5	$	99.0

_______________________________________________________________________________

⁽¹⁾ ETFs traded on foreign exchanges are priced using the fund's published NAV to account for the difference in market close times and are therefore designated as level 2 measurements.

⁽²⁾  Excludes the carrying value of $11.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method and ($2.5) million related to foreign currency forward contracts.

⁽³⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds of $40.6 million for which NAV is generally the practical expedient are no longer classified within the fair value hierarchy.

16

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

($ in millions)	Fair value at December 31, 2016		Level 1		Level 2		Level 3
Fixed maturity investments:
U.S. Government and agency obligations	$	167.3	$	167.3	$	—	$	—
Debt securities issued by corporations:
Consumer	194.8		—		194.8		—
Healthcare	129.2		—		129.2		—
Industrial	118.2		—		118.2		—
Financials	96.3		—		96.3		—
Communications	59.4		—		59.4		—
Energy	47.4		—		47.4		—
Technology	40.7		—		40.7		—
Utilities	39.5		—		39.5		—
Basic materials	37.6		—		37.6		—
Debt securities issued by corporations	763.1		—		763.1		—
Municipal obligations	70.5		—		70.5		—
Mortgage and asset-backed securities	1,153.1		—		1,153.1		—
Foreign government obligations	1.2		0.6		0.6		—
Preferred stocks	13.9		—		13.9		—
Fixed maturity investments	2,169.1		167.9		2,001.2		—
Short-term investments	112.1		112.1		—		—
Common equity securities:
Exchange traded funds(1)	164.4		140.9		23.5		—
Healthcare	7.0		7.0		—		—
Consumer	4.3		4.3		—		—
Financials	3.9		3.9		—		—
Technology	3.7		3.7		—		—
Communications	3.5		3.5		—		—
Energy	1.2		1.2		—		—
Industrial	0.7		0.7		—		—
Common equity securities	188.7		165.2		23.5		—
Other investments(2)(3)	86.2		—		—		86.2
Total(1)(2)(3)	$	2,556.1	$	445.2	$	2,024.7	$	86.2

_______________________________________________________________________________

⁽¹⁾ ETFs traded on foreign exchanges are priced using the fund's published NAV to account for the difference in market close times and are therefore designated as level 2 measurements.

⁽²⁾  Excludes the carrying value of $12.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method.

⁽³⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds of $52.0 million for which NAV is generally the practical expedient are no longer classified within the fair value hierarchy.

17

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Rollforwards of Fair Value Measurements by Level

The following tables summarize the changes in OneBeacon’s fair value measurements by level for the three and six months ended June 30, 2017 and 2016:

							Level 3 Investments
($ in millions)	Level 1 Investments			Level 2 Investments			Fixed maturity investments			Other investments(1)			NAV investments(2)			Total(1)(2)(3)
Balance at January 1, 2017	$	333.1		$	2,024.7		$	—		$	86.2		$	52.0		$	2,496.0
Amortization/accretion	—			(4.1		)	—			—			—			(4.1		)
Net realized and unrealized gains	9.4			7.2			0.1			(2.1		)	0.6			15.2
Purchases	9.3			539.4			47.1			—			0.8			596.6
Sales	(121.4		)	(479.2		)	—			—			(13.2		)	(613.8		)
Transfers in	—			—			—			—			—			—
Transfers out	—			—			—			—			—			—
Balance at March 31, 2017	$	230.4		$	2,088.0		$	47.2		$	84.1		$	40.2		$	2,489.9
Amortization/accretion	—			(3.4		)	—			—			—			(3.4		)
Net realized and unrealized gains	5.1			8.3			—			0.6			0.6			14.6
Purchases	5.4			348.7			14.3			—			0.1			368.5
Sales	(4.6		)	(245.3		)	—			—			(0.3		)	(250.2		)
Transfers in	—			47.2			—			—			—			47.2
Transfers out	—			—			(47.2		)	—			—			(47.2		)
Balance at June 30, 2017	$	236.3		$	2,243.5		$	14.3		$	84.7		$	40.6		$	2,619.4

_______________________________________________________________________________

⁽¹⁾  Excludes the carrying value of $11.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method and $(2.5) million related to foreign currency forward contracts as of June 30, 2017.

⁽²⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds measured generally using the NAV practical expedient are no longer classified within the fair value hierarchy.

⁽³⁾  Excludes short-term investments.

18

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

							Level 3 Investments
($ in millions)	Level 1 Investments			Level 2 Investments			Fixed maturity investments		Other investments(1)		NAV investments(2)			Total(1)(2)(3)
Balance at January 1, 2016	$	363.3		$	1,945.9		$	70.0	$	65.8	62.5			$	2,507.5
Amortization/accretion	—			(3.2		)	—		—		—			(3.2		)
Net realized and unrealized gains	5.6			12.5			0.5		0.4		(2.4		)	16.6
Purchases	98.2			187.0			—		—		0.4			285.6
Sales	(158.4		)	(216.8		)	—		—		(3.0		)	(378.2		)
Transfers in	—			—			—		—		—			—
Transfers out	—			—			—		—		—			—
Balance at March 31, 2016	$	308.7		$	1,925.4		$	70.5	$	66.2	$	57.5		$	2,428.3
Amortization/accretion	—			(2.9		)	—		—		—			(2.9		)
Net realized and unrealized gains	(2.1		)	12.1			0.7		10.9		3.1			24.7
Purchases	38.5			221.2			13.9		—		0.2			273.8
Sales	(75.5		)	(153.6		)	—		—		(4.1		)	(233.2		)
Transfers in	—			—			—		—		—			—
Transfers out	—			—			—		—		—			—
Balance at June 30, 2016	$	269.6		$	2,002.2		$	85.1	$	77.1	$	56.7		$	2,490.7

_______________________________________________________________________________

⁽¹⁾  Excludes the carrying value of $13.4 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method as of June 30, 2016.

⁽²⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds generally measured using the NAV practical expedient are no longer classified within the fair value hierarchy.

⁽³⁾  Excludes short-term investments.

There were no “Transfers in” to Level 3 investments for the six months ended June 30, 2017 and 2016. “Transfers out” of Level 3 investments for the six months ended June 30, 2017 were comprised of $47.2 million in residential mortgage backed securities, which were recategorized as Level 2 measurements when quoted market prices for similar securities that were considered reliable and could be validated against an alternative source became available. There were no "Transfers out" of Level 3 investments for the six months ended June 30, 2016.

The following table summarizes the change in net pre-tax unrealized gains or losses for assets designated as Level 3 for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,				Six months ended June 30,
($ in millions)	2017		2016		2017			2016
Fixed maturity investments	$	—	$	0.7	$	0.1		$	1.2
Other investments	0.6		10.9		(1.5		)	11.3
Total	$	0.6	$	11.6	$	(1.4	)	$	12.5

19

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Significant Unobservable Inputs

As previously described, in certain circumstances, OneBeacon estimates the fair value of investments using industry standard pricing methodologies and both observable and unobservable inputs. The following summarizes significant unobservable inputs used in estimating the fair value of fixed maturity and other investments classified within Level 3, as of June 30, 2017 and December 31, 2016.

($ in millions)	As of June 30, 2017
Description	Fair Value		Rating(1)	Valuation Technique	Unobservable Inputs	Input
Surplus notes:
- Seller priority note	$	48.9	N/R	Discounted cash flow	Discount rate(2)	10.6%
					Timing of interest payments(3)	2020
					Timing of principal payments(3)	2030
- Pari passu note	$	21.6	N/R	Discounted cash flow	Discount rate(4)	15.2%
					Timing of interest payments(5)	2021
					Timing of principal payments(5)	2035
Non-agency residential mortgage-backed securities	$	7.7	AAA	Broker pricing	Broker quote (6)	$	102.0
Non-agency commercial mortgage-backed securities	$	5.0	A-	Broker pricing	Broker quote (6)	$	100.0
Debt securities issued by corporations	$	1.6	BBB	Broker pricing	Broker quote (6)	$	127.5
Community reinvestment vehicle	$	14.2	N/R	Member share of GAAP net equity	GAAP net equity	$	14.2

($ in millions)	As of December 31, 2016
Description	Fair Value		Rating(1)	Valuation Technique	Unobservable Inputs	Input
Surplus notes:
- Seller priority note	$	51.1	N/R	Discounted cash flow	Discount rate(2)	9.6%
					Timing of interest payments(3)	2020
					Timing of principal payments(3)	2030
- Pari passu note	$	20.8	N/R	Discounted cash flow	Discount rate(4)	15.0%
					Timing of interest payments(5)	2021
					Timing of principal payments(5)	2035
Community reinvestment vehicle	$	14.3	N/R	Member share of GAAP net equity	GAAP net equity	$	14.3

_________________________________________________________________________

⁽¹⁾  Credit ratings, if rated, are assigned based on the following hierarchy: 1) Standard & Poor's and 2) Moody's

⁽²⁾  Stochastic modeling supporting the fair value estimation indicates that the average percentage of discounted payments missed on the seller priority note is roughly equivalent to that of a conventional debt security with a credit rating of ‘B’. The corresponding credit spread, increased by an additional 400 bps and 250 bps as of June 30, 2017 and December 31, 2016, respectively, to reflect both a liquidity discount for a private debt instrument and regulatory payment approval uncertainty, was added to the treasury rate to determine the discount rate for the seller priority note.

⁽³⁾  As of June 30, 2017 and December 31, 2016, the Company has assumed for the purpose of estimating fair value that all accrued but unpaid interest on the seller priority note since the date of issuance is paid in 2020, with regular annual interest payments beginning thereafter. Principal repayments are assumed to begin on a graduated basis in 2030.

⁽⁴⁾  Stochastic modeling supporting the fair value estimation indicates that the average percentage of discounted payments missed on the pari passu note is roughly equivalent to that of a conventional debt security with a credit rating of ‘CCC’. The corresponding credit spread, increased by an additional 400 bps and 250 bps as of June 30, 2017 and December 31, 2016, respectively, to reflect both a liquidity discount for a private debt instrument and regulatory payment approval uncertainty, was added to the treasury rate to determine the discount rate for the seller priority note.

⁽⁵⁾  As of June 30, 2017 and December 31, 2016, the company has assumed for the purpose of estimating fair value that regular annual interest payments on the pari passu note begin in 2021. All accrued but unpaid interest since the date of issuance is assumed to be paid in 2025. Principal repayments are assumed to begin on a graduated basis in 2035.

⁽⁶⁾ As of June 30, 2017, asset type consists of one security.

20

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Mortgage and Asset-backed Securities

OneBeacon purchases commercial mortgage-backed securities ("CMBS") and residential mortgage-backed securities ("RMBS") to maximize its risk adjusted returns in the context of a diversified portfolio. OneBeacon's non-agency CMBS are generally short tenor and structurally senior, with approximately 30 points of subordination on average for fixed rate and floating rate CMBS as of June 30, 2017. In general, subordination represents the percentage of principal loss on the underlying collateral that would have to occur before the security incurs a loss. These collateral losses, instead, are first absorbed by other securities lower in the capital structure. OneBeacon believes this structural protection mitigates the risk of loss tied to refinancing challenges facing the commercial real estate market. As of June 30, 2017, none of the underlying loans of the agency and non-agency CMBS were reported as non-performing.

OneBeacon's non-agency RMBS portfolio is generally of moderate average life, fixed rate, and structurally senior. OneBeacon considers sub-prime mortgage-backed securities to be those that have underlying loan pools that exhibit weak credit characteristics or are issued from dedicated sub-prime shelves or dedicated second-lien shelf registrations (i.e., OneBeacon considers investments backed primarily by second-liens to be sub-prime risks regardless of credit scores or other metrics). OneBeacon did not hold any RMBS categorized as sub-prime as of June 30, 2017.

There are also mortgage-backed securities that OneBeacon categorizes as "non-prime" (also called "Alt A" or "A-") that are backed by collateral that has overall credit quality between prime and sub-prime, as determined based on OneBeacon's review of the characteristics of their underlying mortgage loan pools, such as credit scores and financial ratios. As of June 30, 2017, OneBeacon did not hold any mortgage-backed securities classified as non-prime. OneBeacon's non-agency RMBS portfolio is generally of moderate average life, fixed rate and structurally senior. OneBeacon does not own any collateralized debt obligations, with the exception of $23.3 million of non-agency RMBS resecuritization tranches, each a senior tranche in its own right and each collateralized by a single earlier vintage Super Senior or Senior non-agency RMBS.

The following table summarizes the carrying value of OneBeacon's mortgage and asset-backed securities as of June 30, 2017 and December 31, 2016:

	June 30, 2017						December 31, 2016
($ in millions)	Fair Value		Level 2		Level 3		Fair Value		Level 2		Level 3
Mortgage-backed securities:
Agency:
GNMA	$	170.7	$	170.7	$	—	$	213.5	$	213.5	$	—
FNMA	45.7		45.7		—		42.8		42.8		—
FHLMC	22.3		22.3		—		30.3		30.3		—
Total agency(1)	238.7		238.7		—		286.6		286.6		—
Non-agency:
Residential	218.5		210.8		7.7		135.0		135.0		—
Commercial	145.8		140.8		5.0		123.6		123.6		—
Total Non-agency	364.3		351.6		12.7		258.6		258.6		—
Total mortgage-backed securities	603.0		590.3		12.7		545.2		545.2		—
Other asset-backed securities:
Vehicle receivables	216.8		216.8		—		273.6		273.6		—
Credit card receivables	266.3		266.3		—		224.3		224.3		—
Other	154.0		154.0		—		110.0		110.0		—
Total other asset-backed securities	637.1		637.1		—		607.9		607.9		—
Total mortgage and asset-backed securities	$	1,240.1	$	1,227.4	$	12.7	$	1,153.1	$	1,153.1	$	—

_______________________________________________________________________________

⁽¹⁾ Represents publicly traded mortgage-backed securities which carry the full faith and credit guarantee of the U.S. government (i.e., GNMA) or are guaranteed by a government sponsored entity (i.e., FNMA, FHLMC).

21

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Non-agency Mortgage-backed Securities

The security issuance years of OneBeacon's investments in non-agency RMBS and non-agency CMBS securities as of June 30, 2017 are as follows:

	Fair Value		Security Issuance Year
($ in millions)			2004		2005		2006		2008		2010		2011		2012		2013		2014		2015		2016		2017
Total non-agency RMBS	$	218.5	$	16.8	$	5.0	$	2.5	$	2.3	$	4.7	$	7.7	$	3.5	$	17.4	$	24.9	$	50.0	$	31.0	$	52.7
Total non-agency CMBS	145.8		—		—		—		—		3.8		—		18.1		11.5		23.5		43.8		21.2		23.9
Total non-agency	$	364.3	$	16.8	$	5.0	$	2.5	$	2.3	$	8.5	$	7.7	$	21.6	$	28.9	$	48.4	$	93.8	$	52.2	$	76.6

Non-agency Residential Mortgage-backed Securities

The classification of the underlying collateral quality and the tranche levels of OneBeacon's non-agency RMBS securities are as follows as of June 30, 2017:

($ in millions)	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
Prime	$	218.5	$	46.2	$	172.3	$	—
Total non-agency RMBS	$	218.5	$	46.2	$	172.3	$	—

_______________________________________________________________________________

⁽¹⁾ At issuance, Super Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch Ratings ("Fitch") and were senior to other AAA or Aaa securities.

⁽²⁾ At issuance, Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were senior to non-AAA or non-Aaa securities.

⁽³⁾ At issuance, Subordinate were not rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were junior to other AAA or Aaa securities.

Non-agency Commercial Mortgage-backed Securities

The amount of fixed and floating rate securities and their tranche levels of OneBeacon's non-agency CMBS securities are as follows as of June 30, 2017:

($ in millions)	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
Fixed rate CMBS	$	126.4	$	1.6	$	83.0	$	41.8
Floating rate CMBS	19.4		—		—		19.4
Total non-agency CMBS	$	145.8	$	1.6	$	83.0	$	61.2

_______________________________________________________________________________

⁽¹⁾ At issuance, Super Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's or AAA by Fitch and were senior to other AAA or Aaa securities.

⁽²⁾ At issuance, Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were senior to non-AAA or non-Aaa securities.

⁽³⁾ At issuance, Subordinate were not rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were junior to other AAA or Aaa securities.

22

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Other Investments

As of both June 30, 2017 and December 31, 2016, other investments reported at fair value represented approximately 5% of the total investment portfolio and consisted of the following:

($ in millions)	June 30, 2017			December 31, 2016
Hedge funds(1)	$	18.2		$	18.4
Private equity funds(2)	22.4			33.6
Total hedge funds and private equity funds	40.6			52.0
Surplus notes (par value $101.0)(3)	70.5			71.9
Investment in community reinvestment vehicle	14.2			14.3
Foreign currency forward contract	(2.5		)	—
Total other investments(4)	$	122.8		$	138.2

_______________________________________________________________________________

⁽¹⁾  Consists of 4 hedge funds as of both June 30, 2017 and December 31, 2016.

⁽²⁾  Consists of 14 and 17 private equity funds as of June 30, 2017 and December 31, 2016, respectively.

⁽³⁾  The decrease in fair value of the surplus notes during the six months ended June 30, 2017 was driven primarily by an increase in the assumed liquidity spread, partially offset by the narrowing of non-investment grade credit spreads as well as the time value of money benefit generated by moving six months closer to modeled cash receipts.

⁽⁴⁾  Excludes the carrying value of $11.3 million and $12.3 million as of June 30, 2017 and December 31, 2016, respectively, associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method.

The largest investment in a single hedge fund or private equity fund was $16.1 million and $15.0 million as of June 30, 2017 and December 31, 2016, respectively.

Surplus Notes

In the fourth quarter of 2014, in conjunction with the Runoff Transaction, OneBeacon provided financing in the form of surplus notes, which had a fair value of $70.5 million and $71.9 million as of June 30, 2017 and December 31, 2016, respectively. The surplus notes, issued by one of the transferred entities, Bedivere Insurance Company (“Bedivere" or "Issuer”), were in the form of both seller priority and pari passu notes.

The internal valuation model used to estimate the fair value of the surplus notes is based on discounted expected cash flows using information as of the measurement date. The estimated fair value of the surplus notes is sensitive to changes in public debt credit spreads, as well as changes in estimates with respect to other variables including a discount to reflect the private nature of the notes (and the related lack of liquidity), the credit quality of the notes, based on the financial performance of the Issuer relative to expectations, and the timing, amount, and likelihood of interest and principal payments on the notes, which are subject to regulatory approval and therefore may vary from the contractual terms. For the purposes of estimating fair value, the Company has assumed that all accrued but unpaid interest on the seller priority note since the date of issuance is paid in 2020, with regular annual interest payments on both the seller priority note and the pari passu note beginning in 2021, all accrued but unpaid interest on the pari passu note since the date of issuance is paid in 2025 and principal repayments begin on a graduated basis in 2030 for the seller priority note and 2035 for the pari passu note. Although these variables involve considerable judgment, the Company does not currently expect any resulting changes in the estimated value of the surplus notes to be material to its financial position. An interest payment of $2.4 million was received in the six months ended June 30, 2016.

23

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Below is a table illustrating the valuation adjustments taken to arrive at estimated fair value of the surplus notes as of June 30, 2017 and December 31, 2016:

	Type of Surplus Note						Total as of June 30, 2017
	Seller Priority			Pari Passu
	(in millions)
Par value	$	57.9		$	43.1		$	101.0
Fair value adjustments to reflect:
Current market rates on public debt and contract-based repayments(1)	7.9			2.1			10.0
Regulatory approval(2)	2.7			(13.7		)	(11.0		)
Liquidity adjustment(3)	(19.6		)	(9.9		)	(29.5		)
Total	(9.0		)	(21.5		)	(30.5		)
Fair value(4)	$	48.9		$	21.6		$	70.5

	Type of Surplus Note						Total as of December 31, 2016
	Seller Priority			Pari Passu
	(in millions)
Par value	$	57.9		$	43.1		$	101.0
Fair value adjustments to reflect:
Current market rates on public debt and contract-based repayments(1)	6.2			(1.1		)	5.1
Regulatory approval(2)	(0.2		)	(15.4		)	(15.6		)
Liquidity adjustment(3)	(12.8		)	(5.8		)	(18.6		)
Total	(6.8		)	(22.3		)	(29.1		)
Fair value	$	51.1		$	20.8		$	71.9

_______________________________________________________________________________

⁽¹⁾  Represents the value of the surplus notes, at current market yields on comparable publicly traded debt, and assuming issuer is allowed to make principal and interest payments when its financial capacity is available, as measured by statutory capital in excess of a 250% RBC score under the National Association of Insurance Commissioners’ risk-based capital standards for property and casualty companies. The favorable year-to-date change in impact is due principally to the narrowing of non-investment grade credit spreads as well as the time value of money benefit from moving three months closer to modeled cash receipts.

⁽²⁾  Represents anticipated delay in securing regulatory approvals of interest and principal payments to reflect graduated changes in Issuer's statutory surplus. The monetary impact of the anticipated delay is measured based on credit spreads of public securities with roughly equivalent percentages of discounted payments missed. The favorable year-to-date change in impact is driven primarily by the narrowing of non-investment grade credit spreads, which causes the anticipated delay in securing regulatory approval to be less punitive.

⁽³⁾  Represents impact of liquidity spread to account for OneBeacon's sole ownership of the notes, lack of a trading market, and unique nature of the ongoing regulatory approval process. The unfavorable year-to-date change in impact is due largely to an increase in the assumed liquidity spread to 400 basis points at June 30, 2017 from 250 basis points at December 31, 2016.

⁽⁴⁾  The decrease in fair value of the surplus notes during the six months ended June 30, 2017 was driven primarily by an increase in the assumed liquidity spread, partially offset by the narrowing of non-investment grade credit spreads as well as the time value of money benefit generated by moving six months closer to modeled cash receipts.

24

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Hedge Funds and Private Equity Funds

OneBeacon holds investments in hedge funds and private equity funds which are included in other investments. The fair value of these investments has generally been estimated using the net asset value of the funds. The following table summarizes investments in hedge funds and private equity funds as of June 30, 2017 and December 31, 2016:

	June 30, 2017				December 31, 2016
($ in millions)	Fair Value		Unfunded Commitments		Fair Value		Unfunded Commitments
Hedge funds
Long/short equity banks and financials	$	16.1	$	—	$	15.0	$	—
Other	2.1		—		3.4		—
Total hedge funds	18.2		—		18.4		—
Private equity funds
Multi-sector	11.0		2.0		11.5		2.0
Healthcare	3.4		0.4		3.5		0.4
Energy infrastructure and services	3.2		3.0		14.1		3.2
Private equity secondaries	2.4		2.1		3.0		2.1
Direct lending / mezzanine debt	1.3		6.2		0.4		7.1
Insurance	0.9		0.1		0.8		0.1
Real estate	0.2		0.1		0.3		0.1
Total private equity funds	22.4		13.9		33.6		15.0
Total hedge funds and private equity funds	$	40.6	$	13.9	$	52.0	$	15.0

Redemptions of investments in certain hedge funds are subject to restrictions including "lock-up" periods where no redemptions or withdrawals are allowed, restrictions on redemption frequency and advance notice periods for redemptions. Amounts requested for redemptions remain subject to market fluctuations until the redemption effective date, which generally falls at the end of the defined redemption period. As of June 30, 2017, none of OneBeacon's hedge funds were subject to lock-up. The following summarizes the June 30, 2017 fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds:

	Hedge Funds Notice Period
($ in millions)	30 - 59 days notice		60 - 89 days notice		90 - 119 days notice		120+ days notice		Total
Redemption frequency
Monthly	$	—	$	—	$	—	$	—	$	—
Quarterly	16.1		—		—		—		16.1
Annual	—		—		2.1		—		2.1
Total hedge funds	$	16.1	$	—	$	2.1	$	—	$	18.2

Certain hedge fund investments are no longer active and are in the process of disposing of their underlying investments. Distributions from such funds are remitted to investors as the fund's underlying investments are liquidated. As of June 30, 2017, OneBeacon's hedge funds in liquidation had a fair value of zero. The actual amount of the final distribution is subject to market fluctuations. The date at which such distributions, if any, will be received is not determinable as of June 30, 2017.

OneBeacon has also submitted redemption requests for certain of its investments in active hedge funds. As of June 30, 2017, redemptions of $2.1 million were outstanding and remain subject to market fluctuations. The date at which such redemptions will be received is not determinable at June 30, 2017. Redemptions are recorded as receivables when the investment is no longer subject to market fluctuations.

25

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 5. Investment Securities

Investments in private equity funds are generally subject to lock-up periods during which investors may not request a redemption. Distributions prior to the expected termination date of the fund may be limited to dividends or proceeds arising from the liquidation of the fund's underlying investment. In addition, certain private equity funds provide an option to extend the lock-up period at either the sole discretion of the fund manager or upon agreement between the fund and the investors. As of June 30, 2017, investments in private equity funds were subject to lock-up periods as follows:

($ in millions)	1 - 3 years		3 - 5 years		5 - 10 years		>10 years		Total
Private Equity Funds—expected lock-up period remaining	$	18.7	$	2.4	$	—	$	1.3	$	22.4

Foreign Currency Forward Contracts

During the first quarter of 2017, OneBeacon established a portfolio of investment grade fixed maturity investments denominated in British Pound Sterling ("GBP"). As part of managing exposure to foreign currency risk within that portfolio, the Company entered into a foreign currency forward contract with notional amounts of $62.6 million (GBP 50.0 million) as of June 30, 2017. The contract does not meet the criteria to be accounted for as a hedge.

As of June 30, 2017, the fair value of the foreign currency forward contracts, as estimated using OTC quotes for similar instruments, which are classified as Level 2 measurements with the fair value hierarchy, was negative $2.5 million, and was included in other investments. During the three and six months ended June 30, 2017, change in fair value of negative $2.3 million and negative $2.5 million, respectively, was included in net realized and change in unrealized investment gains, with no such amount included for the three and six months ended June 30, 2016. The Company's derivative transactions are documented under an International Swaps and Derivatives Association ("ISDA") agreement and are subject to a master netting agreement. In conjunction with the ISDA agreement, no collateral is either pledged or received related to this contract. The following table summarizes the notional amount and uncollaterized balance as of June 30, 2017:

($ in millions)	Notional Amount		Carrying Value			Standard & Poor's Rating
Counterparty
Barclays Bank PLC	$	62.6	$	(2.5	)	A-

NOTE 6. Debt

OneBeacon's debt outstanding as of June 30, 2017 and December 31, 2016 consisted of the following:

($ in millions)	June 30, 2017			December 31, 2016
Senior unsecured notes, at face value	$	275.0		$	275.0
Unamortized original issue discount	(0.2		)	(0.2		)
Unamortized issuance costs	(1.5		)	(1.6		)
Senior unsecured notes, carrying value	$	273.3		$	273.2

2012 Senior Notes

In November 2012, OneBeacon U.S. Holdings, Inc. ("OBH") issued $275.0 million face value of senior unsecured notes ("2012 Senior Notes") through a public offering, at an issue price of 99.9% and received $272.9 million of proceeds. The 2012 Senior Notes bear an annual interest rate of 4.6% payable semi-annually in arrears on May 9 and November 9, until maturity on November 9, 2022, and are fully and unconditionally guaranteed as to the payment of principal and interest by the Company. Taking into effect the amortization of the original issue discount and all underwriting and issuance expenses, the 2012 Senior Notes have an effective yield to maturity of approximately 4.7% per annum.

Credit Facility

On September 29, 2015, the Company and OBH, as co-borrowers and co-guarantors, entered into a revolving credit facility administered by U.S. Bank N.A. and also including BMO Harris Bank N.A., which has a total commitment of $65.0 million and has a maturity date of September 29, 2019 (the "Credit Facility"). As of June 30, 2017, the Credit Facility was undrawn.

26

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 6. Debt

Debt Covenants

The 2012 Senior Notes were issued under indentures that contain restrictive covenants which, among other things, limit the ability of the Company, OBH, and their respective subsidiaries to create liens and enter into sale and leaseback transactions and limits the ability of the Company and OBH to consolidate, merge or transfer its properties and assets. The indentures do not contain any financial ratios or specified levels of net worth or liquidity to which the Company or OBH must adhere. In addition, a failure by the Company or OBH or their respective subsidiaries to pay principal and interest on covered debt, where such failure results in the acceleration of at least $75.0 million of the principal amount of covered debt, could trigger the acceleration of the 2012 Senior Notes.

The Credit Facility contains various affirmative, negative and financial covenants which OneBeacon considers to be customary for such borrowings, including certain minimum net worth and maximum debt to capitalization standards. These covenants can restrict the Company, OBH and their respective subsidiaries in several ways, including their ability to incur additional indebtedness. An uncured breach of these covenants could result in an event of default under the Credit Facility, which would allow lenders to declare any amounts owed under the Credit Facility to be immediately due and payable.

As of June 30, 2017, OneBeacon was in compliance with all of the covenants under the 2012 Senior Notes and the Credit Facility. The closing of the OneBeacon Acquisition will not result in any default under the indenture for the 2012 Senior Notes. While the closing of the OneBeacon Acquisition would constitute an event of default under the Credit Facility, OneBeacon intends to voluntarily terminate the Credit Facility, which is undrawn, effective as of the closing.

NOTE 7. Segment Information

The Company has sixteen active underwriting operating segments, which are managed by the Chief Operating Decision Maker ("CODM") and are aggregated into two underwriting reportable segments, Specialty Products and Specialty Industries. In addition, the Investing, Financing and Corporate reportable segment includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through the Company and its intermediate holding company subsidiaries.

Invested assets are not allocated to the Specialty Products and Specialty Industries segments since OneBeacon does not manage them by segment. Invested assets, net investment income and net realized and change in unrealized investment gains related to OneBeacon's Specialty Products and Specialty Industries segments are included in the Investing, Financing and Corporate segment since these assets are available for payment of losses and expenses for all segments. Debt and related interest expense also are not allocated to or managed by segment and are also included in the Investing, Financing and Corporate segment.

During the three months ended March 31, 2017, the Company completed its transition to reflect certain management changes and a re-segmenting of various business lines within underwriting operating segments. As part of the transition, the Company's executive management, including the CODM, began receiving a new CODM package which reflected an adjusted aggregation of the underwriting operating segments among the existing underwriting reportable segments. The new underwriting operating segments are also consistent with how the Company began externally branding the related insurance products during the three months ended March 31, 2017. The following represents a summary of the changes made:

Media liability: The media liability line, which was previously included in the Other Professional Lines underwriting operating segment within Specialty Products, was moved into the Entertainment underwriting operating segment within Specialty Industries.

Medical excess:The medical excess line, which was previously included in the Healthcare underwriting operating segment within Specialty Products, was moved into the Accident underwriting operating segment which, in turn, has been renamed "Accident and Health" within Specialty Industries.

Architects and Engineers:The Architects and Engineers line, which was previously included in the Other Professional Lines underwriting operating segment within Specialty Products, has been separately broken out such that it is now a separate underwriting operating segment.

Other Professional Lines:The Other Professional Lines former underwriting operating segment is no longer considered an underwriting operating segment.

Other than these changes, there have been no material changes to the Company's determination of reportable segments from that reported in the 2016 Annual Report on Form 10-K.

27

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 7. Segment Information

The Specialty Products segment now includes Healthcare, Tuition Reimbursement, Programs, Surety, Management Liability, Financial Services, Architects and Engineers, Specialty Property, Environmental, and Financial Institutions underwriting operating segments. The Specialty Industries segment includes the Accident and Health, Technology, Ocean Marine, Government Risks, Entertainment, and Inland Marine underwriting operating segments

Prior periods have been restated to conform to the current presentation of segment information. Substantially all of the Company's revenue is generated from customers located in the United States.

Financial information for OneBeacon's reportable segments is as follows:

	Insurance Operations						Investing, Financing and Corporate
($ in millions)	Specialty Products			Specialty Industries						Consolidated
Three months ended June 30, 2017
Earned premiums	$	130.4		$	147.0		$	—		$	277.4
Loss and loss adjustment expense	(98.6		)	(90.0		)	—			(188.6		)
Policy acquisition expenses	(22.0		)	(26.4		)	—			(48.4		)
Other underwriting expenses	(24.8		)	(34.8		)	—			(59.6		)
Total underwriting loss	(15.0		)	(4.2		)	—			(19.2		)
Net investment income	—			—			14.5			14.5
Net realized and change in unrealized investment gains	—			—			12.3			12.3
Net other revenues	—			0.2			1.9			2.1
General and administrative expenses	—			(0.5		)	(8.3		)	(8.8		)
Interest expense	—			—			(3.3		)	(3.3		)
Pre-tax income (loss)	$	(15.0	)	$	(4.5	)	$	17.1		$	(2.4	)
Three months ended June 30, 2016
Earned premiums	$	123.1		$	148.3		$	—		$	271.4
Loss and loss adjustment expense	(99.4		)	(80.3		)	—			(179.7		)
Policy acquisition expenses	(21.6		)	(27.1		)	—			(48.7		)
Other underwriting expenses	(22.3		)	(28.6		)	—			(50.9		)
Total underwriting income (loss)	(20.2		)	12.3			—			(7.9		)
Net investment income	—			—			12.1			12.1
Net realized and change in unrealized investment gains	—			—			24.7			24.7
Net other revenues	—			0.2			0.6			0.8
General and administrative expenses	—			(0.5		)	(3.0		)	(3.5		)
Interest expense	—			—			(3.2		)	(3.2		)
Pre-tax income (loss)	$	(20.2	)	$	12.0		$	31.2		$	23.0

28

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 7. Segment Information

	Insurance Operations						Investing, Financing and Corporate
($ in millions)	Specialty Products			Specialty Industries						Consolidated
Six months ended June 30, 2017
Earned premiums	$	249.6		$	289.6		$	—		$	539.2
Loss and loss adjustment expense	(181.5		)	(157.7		)	—			(339.2		)
Policy acquisition expenses	(41.6		)	(52.1		)	—			(93.7		)
Other underwriting expenses	(45.5		)	(65.8		)	—			(111.3		)
Total underwriting income (loss)	(19.0		)	14.0			—			(5.0		)
Net investment income	—			—			26.7			26.7
Net realized and change in unrealized investment gains	—			—			27.3			27.3
Net other revenues (expenses)	(0.1		)	0.4			5.2			5.5
General and administrative expenses	—			(1.0		)	(12.8		)	(13.8		)
Interest expense	—			—			(6.6		)	(6.6		)
Pre-tax income (loss)	$	(19.1	)	$	13.4		$	39.8		$	34.1
Six months ended June 30, 2016
Earned premiums	$	246.3		$	303.7		$	—		$	550.0
Loss and loss adjustment expense	(185.8		)	(152.7		)	—			(338.5		)
Policy acquisition expenses	(44.8		)	(54.9		)	—			(99.7		)
Other underwriting expenses	(43.6		)	(62.6		)	—			(106.2		)
Total underwriting income (loss)	(27.9		)	33.5			—			5.6
Net investment income	—			—			26.5			26.5
Net realized and change in unrealized investment gains	—			—			41.3			41.3
Net other revenues (expenses)	(0.1		)	0.5			1.3			1.7
General and administrative expenses	—			(1.0		)	(6.4		)	(7.4		)
Interest expense	—			—			(6.5		)	(6.5		)
Pre-tax income (loss)	$	(28.0	)	$	33.0		$	56.2		$	61.2

29

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 7. Segment Information

	Insurance Operations				Investing, Financing and Corporate
($ in millions)	Specialty Products		Specialty Industries				Consolidated
June 30, 2017
Assets
Total investment securities	$	—	$	—	$	2,683.7	$	2,683.7
Premiums receivable	72.9		172.5		—		245.4
Reinsurance recoverables(1)	134.3		46.5		17.2		198.0
Deferred acquisition costs	51.1		55.8		—		106.9
Ceded unearned premiums	46.2		10.4		—		56.6
Other assets	1.0		0.1		404.7		405.8
Total Assets	$	305.5	$	285.3	$	3,105.6	$	3,696.4
Liabilities
Unpaid loss and loss adjustment expense reserves(1)	$	778.7	$	615.3	$	17.2	$	1,411.2
Unearned premiums	301.9		293.3		—		595.2
Funds held under insurance contracts	210.2		—		—		210.2
Debt	—		—		273.3		273.3
Other liabilities	—		—		191.7		191.7
Total Liabilities	$	1,290.8	$	908.6	$	482.2	$	2,681.6
December 31, 2016
Assets
Total investment securities	$	—	$	—	$	2,620.4	$	2,620.4
Premiums receivable	80.1		148.2		—		228.3
Reinsurance recoverables(1)	120.9		40.3		18.3		179.5
Deferred acquisition costs	46.1		50.2		—		96.3
Ceded unearned premiums	33.7		10.5		—		44.2
Other assets	1.1		0.1		420.0		421.2
Total Assets	$	281.9	$	249.3	$	3,058.7	$	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves(1)	$	734.9	$	612.4	$	18.3	$	1,365.6
Unearned premiums	307.3		267.8		—		575.1
Funds held under insurance contracts	153.0		—		—		153.0
Debt	—		—		273.2		273.2
Other liabilities	—		—		197.8		197.8
Total Liabilities	$	1,195.2	$	880.2	$	489.3	$	2,564.7

_______________________________________________________________________________

⁽¹⁾  Atlantic Specialty Insurance Company ("ASIC"), the top tier regulated U.S. insurance operating subsidiary of the Company, is ceding to Bedivere 100% of the legacy runoff business that was written by ASIC or one of the ongoing entities. As of June 30, 2017 and December 31, 2016, $17.2 million and $18.3 million, respectively, are included in both unpaid loss and loss adjustment expense reserves and reinsurance recoverables included within Investing, Financing, and Corporate.

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 8. Retirement Plans

OneBeacon previously sponsored the OneBeacon qualified pension plan (the "Qualified Plan"). During the six months ended June 30, 2016, the Qualified Plan finalized its termination by purchasing group annuity contracts from the Principal Financial Group ("Principal"), and making lump sum distributions to Qualified Plan participants electing such payments, which eliminated the remaining Qualified Plan liability, and also ceased administratively paying benefits. As a result of these transactions, the Company recognized a pre-tax pension settlement charge of $0.2 million during the six months ended June 30, 2016, and no longer has a projected benefit obligation with respect to the Qualified Plan. During the year ended December 31, 2016, the Company transferred $47.1 million of excess invested assets from the Qualified Plan into the trust supporting the OneBeacon 401(k) Savings and Employee Stock Ownership Plan ("KSOP"), which is the Qualified Replacement Plan ("QRP"), with $14.3 million of excess invested assets remaining in the Qualified Plan trust as of June 30, 2017 in order to wind-down potential post-termination obligations of that plan, as approved by way of a March 2016 private letter ruling from the IRS. The invested assets related to both the legacy Qualified Plan trust and the QRP of $43.0 million as of June 30, 2017, are included in other assets and are accounted for at fair value with related income recognized in net other revenues.

OneBeacon continues to sponsor a non-qualified, non-contributory, defined benefit pension plan ("Non-qualified Plan") covering certain employees who were employed as of December 31, 2001 and former employees who had met the eligibility requirements, as well as retirees. The Non-qualified Plan was frozen and curtailed in 2002 resulting in the pension benefit obligation being equal to the accumulated benefit obligation. The benefits are based primarily on years of service and employees’ compensation through December 31, 2002. OneBeacon’s funding policy is generally to contribute amounts to satisfy actual disbursements for the calendar year.

The components of net periodic benefit cost for the three and six months ended June 30, 2017 and 2016 for the Non-qualified Plan and Qualified Plan were as follows:

	Three months ended  June 30,					Six months ended June 30,
($ in millions)	2017 (1)		2016			2017		2016
Service cost	$	—	$	—		$	—	$	0.2
Interest cost	0.2		0.3			0.4		1.1
Expected return on plan assets	—		—			—		(1.0		)
Amortization of unrecognized loss	0.2		0.2			0.4		0.5
Net periodic pension cost	0.4		0.5			0.8		0.8
Settlement loss(2)	—		(0.1		)	—		0.2
Total net periodic benefit income	$	0.4	$	0.4		$	0.8	$	1.0

_______________________________________________________________________________

⁽¹⁾ Represents the components of net periodic benefit cost for the Non-qualified Plan as the Qualified Plan was terminated in 2016.

⁽²⁾ Represents the impact of the termination of the Qualified Plan during the three and six months ended June 30, 2016.

OneBeacon anticipates contributing $2.1 million to the Non-qualified Plan in 2017, for which OneBeacon has assets held in a rabbi trust. During the three and six months ended June 30, 2017, the Company contributed $0.5 million and $1.0 million, respectively, to the Non-qualified Plan.

OneBeacon sponsors an employee savings plan (defined contribution plan) covering the majority of employees. The contributory plan historically provided qualifying employees with matching contributions of 50% of the first 6% of salary (subject to federal limits on allowable contributions in a given year). During mid-2016, the matching contribution of the contributory plan was replaced with a fixed 3% of salary employer contribution (subject to federal limits on allowable contributions in a given year). Total expense for the contribution was $0.8 million and $0.7 million in the three months ended June 30, 2017, and 2016, respectively and $1.8 million and $1.4 million in the six months ended June 30, 2017 and 2016, respectively. The employee savings plan also includes an employee stock ownership component. See Note 9—"Employee Share-Based Incentive Compensation Plans."

OneBeacon had a post-employment benefit liability related to disability and health benefits available to former employees that are no longer employed by the Company of $2.7 million and $3.1 million as of June 30, 2017 and December 31, 2016, respectively.

OneBeacon also had a post-employment benefit liability related to death benefits to beneficiaries of former executives that are no longer employed by the Company of $12.8 million both June 30, 2017 and December 31, 2016. OneBeacon has set aside funds to satisfy its obligation in a rabbi trust of $22.7 million and $29.3 million as of June 30, 2017 and December 31, 2016,

31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 8. Retirement Plans

respectively. During the last half of 2016, the Company withdrew $5.5 million from the rabbi trust in accordance with the trust agreement, which remains overfunded.

NOTE 9. Employee Share-Based Incentive Compensation Plans

OneBeacon's share-based compensation plans include performance shares, restricted shares and restricted stock units ("RSUs"), which are designed to maximize shareholder value over long periods of time by aligning the financial interests of its management with those of its owners. Performance shares are payable only upon achievement of pre-defined business goals and are valued based on the market value of OneBeacon's common shares at the time awards are earned. Performance shares and restricted stock units are typically paid in cash, though, in some instances, they may be paid in common shares or may be deferred in accordance with the terms of OneBeacon's deferred compensation plan. Beginning with the 2017-2019 cycle, performance shares were eliminated as a component of the Company's share-based compensation. Restricted shares vest either annually in equal installments over the specified service period or cliff-vest in full after the service period, depending on the award. OneBeacon expenses the full cost of all its share-based compensation over the requisite service period. The Company recognized expense related to its share-based compensation plans, including the KSOP plan, of $6.5 million and $2.5 million for the three months ended June 30, 2017 and 2016, respectively and $9.5 million and $5.2 million for the six months ended June 30, 2017 and 2016, respectively.

Performance Shares

The following summarizes performance share activity for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,
	2017			2016
($ in millions)	Target Performance Shares outstanding	Accrued expense		Target Performance Shares outstanding	Accrued expense
Beginning of period	309,796	$	1.9	441,206	$	1.1
Payments and deferrals (1)	—	—		—	—
New awards	—	—		—	—
Forfeitures and net change in assumed forfeitures	—	—		—	—
Expense (income) recognized (2)	—	2.0		—	(0.1		)
End of period	309,796	$	3.9	441,206	$	1.0

	Six months ended June 30,
	2017				2016
($ in millions)	Target Performance Shares outstanding		Accrued expense		Target Performance Shares outstanding		Accrued expense
Beginning of period	452,519		$	1.6	449,435		$	1.4
Payments and deferrals (1)	(142,710	)	—		(167,300	)	(0.7		)
New awards	—		—		163,150		—
Forfeitures and net change in assumed forfeitures	(13	)	—		(4,079	)	—
Expense (income) recognized (2)	—		2.3		—		0.3
End of period	309,796		$	3.9	441,206		$	1.0

_______________________________________________________________________________

⁽¹⁾  There were no Performance share payments in 2017 for the 2014-2016 performance cycle due to the factor being zero. Performance share payments in 2016 for the 2013-2015 performance cycle were based upon a performance factor of 24.3%.

⁽²⁾  The assumed performance factor for the 2015-2017 performance cycle was increased to 100% during the three months ended June 30, 2017 as per the terms of the OneBeacon Acquisition.

32

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 9. Employee Share-Based Incentive Compensation Plans

The following summarizes performance shares outstanding and accrued performance share expense at June 30, 2017 for each performance cycle:

($ in millions)	Target OB Performance Shares outstanding	Accrued expense
Performance cycle:
2015 — 2017	146,646	$	2.5
2016 — 2018	163,150	1.4
Subtotal	309,796	3.9
Assumed forfeitures	—	—
Total at June 30, 2017	309,796	$	3.9

All performance shares cliff vest on December 31 of the last year in the cycle. If 100% of the outstanding performance shares had been vested on June 30, 2017, the total additional compensation cost to be recognized would have been $1.9 million, based on current accrual factors (common share price, accumulated dividends and payout assumptions) at June 30, 2017.

All performance shares earned and paid were settled in cash or by deferral into OneBeacon's deferred compensation plan.

Restricted Shares

On February 28, 2017, OneBeacon issued to certain employees 461,160 shares of restricted stock having a grant date fair value of $7.4 million, of which 235,000 were issued in anticipation of a sale transaction, as described in Note 2—"OneBeacon Acquisition," andare scheduled to cliff vest on August 28, 2018, 110,710 are scheduled to vest in two equal installments on February 24, 2018 and February 24, 2019, and 115,450 are scheduled to cliff vest on January 1, 2020.

On February 24, 2016, OneBeacon issued to certain employees 170,650 shares of restricted stock having a grant date fair value of $2.3 million, of which 92,500 are scheduled to cliff vest in full on February 24, 2018 and the remaining 78,150 are scheduled to cliff vest in full on January 1, 2019.

On February 24, 2015, OneBeacon issued to certain employees 75,950 shares of restricted stock having a grant date fair value of $1.1 million, of which 67,722 were outstanding as of June 30, 2017 and are scheduled to cliff vest in full on January 1, 2018.

On May 25, 2011, OneBeacon issued to its CEO 630,000 shares of restricted stock, of which 157,500 restricted shares vested on each of February 22, 2014, 2015, 2016, and 2017.

The restricted shares contain dividend participation features and therefore are considered participating securities.

33

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 9. Employee Share-Based Incentive Compensation Plans

The following summarizes restricted shares activity for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,
	2017				2016
($ in millions)	Restricted Shares	Unamortized Issue Date Fair Value			Restricted Shares	Unamortized Issue Date Fair Value
Beginning of period	699,532	$	8.6		395,872	$	4.3
New awards	—	—			—	—
Forfeitures	—	—			—	—
Vested	—	—			—	—
Expense recognized	—	(1.5		)	—	(0.8		)
End of period	699,532	$	7.1		395,872	$	3.5

	Six months ended June 30,
	2017					2016
($ in millions)	Restricted Shares		Unamortized Issue Date Fair Value			Restricted Shares		Unamortized Issue Date Fair Value
Beginning of period	395,872		$	2.1		382,722		$	2.5
New awards	461,160		7.4			170,650		2.3
Forfeitures	—		—			—		—
Vested	(157,500	)	—			(157,500	)	—
Expense recognized	—		(2.4		)	—		(1.3		)
End of period	699,532		$	7.1		395,872		$	3.5

Restricted shares that vested during the six months ended June 30, 2017 and 2016 had a grant date fair value of $2.1 million and $2.1 million, respectively. No shares vested during the three months ended June 30, 2017 or 2016. As of June 30, 2017, unrecognized compensation expense of $7.1 million related to restricted stock awards is expected to be recognized over a weighted-average period of 0.8 years.

Restricted Stock Units

During the six months ended June 30, 2017, 240,840 RSUs were issued, 239,470 of which were outstanding as of June 30, 2017. The RSUs are scheduled to cliff vest in full on December 31, 2019, at which time the RSUs will be paid out in cash or shares at the discretion of the Compensation Committee. During the six months ended June 30, 2016, 227,788 RSUs were issued, of which 206,502 were outstanding as of June 30, 2017. The expense associated with the RSUs, which is being recognized over the vesting period, was $1.5 million and $0.5 million for the three months ended June 30,2017 and 2016, respectively, and $2.1 million and $0.9 million for the six months ended June 30,2017 and 2016, respectively.

If 100% of outstanding RSUs had vested on June 30, 2017, additional compensation cost to be recognized would have been $7.0 million, based on current accrual factors (common share price and accumulated dividends) as of June 30, 2017.

Share-Based Compensation under Qualified Retirement Plans

OneBeacon sponsors a defined contribution plan, the KSOP. Under the KSOP, participants have the ability to invest their balances in several different investment options, including the common shares of White Mountains and the common shares of the Company. OneBeacon has recorded $1.5 million and $1.3 million in compensation expense to pay benefits and allocate common shares to participants' accounts for the three months ended June 30,2017 and 2016, respectively, and recorded $2.7 million and $2.7 million for the six months ended June 30,2017 and 2016, respectively.

As of June 30, 2017 and December 31, 2016, the KSOP owned less than 3% of either of the total White Mountains common shares outstanding or the total Company common shares outstanding. All common shares held by the KSOP are considered outstanding for earnings per share computations.

34

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 10. Income Taxes

OneBeacon and its Bermuda-domiciled subsidiaries are not subject to Bermuda income tax under current Bermuda law. In the event that there is a change in the current law such that taxes are imposed, OneBeacon and its Bermuda-domiciled subsidiaries would be exempt from such tax until March 31, 2035, pursuant to the Bermuda Exempted Undertakings Tax Protection Act of 1966. OneBeacon also has subsidiaries that operate in Gibraltar, Barbados, Luxembourg, Ireland, the United Kingdom and the United States. U.S. operations are financed with a combination of debt and equity and the financing income and underwriting income currently account for the majority of non-U.S. earnings.

OneBeacon's income tax benefit related to pre-tax income for the three months ended June 30, 2017 and 2016 represented a net effective tax rate of 112.5% and (8.7)%, respectively, and for the six months ended June 30, 2017 and 2016 represented a net effective tax rate of 3.5% and (17.5)%, respectively. The effective tax rates for the three and six months ended June 30, 2017 and 2016, were lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income and underwriting income taxed in a jurisdiction with a lower effective tax rate. Additionally, the rate for the three months ended June 30, 2016 was impacted by a $3.5 million favorable settlement of the 2010-2012 IRS exam and the rate for the six months ended June 30, 2016 was impacted by a $12.8 million favorable settlement of the 2007-2009 IRS exam in addition to the $3.5 million favorable settlement of the 2010-2012 IRS exam. For the three months ended June 30, 2017 and 2016, the effective tax rate on non-U.S. income was 0.7% and 0.5%, respectively and for the six months ended June 30, 2017 and 2016, the effective tax rate on non-U.S. income was 0.3% and 0.7%, respectively.

In arriving at the effective tax rate for the three and six months ended June 30, 2017 and 2016, OneBeacon forecasted all income and expense items including the realized and change in unrealized investment gains for the years ending December 31, 2017 and 2016, and included these gains in the effective tax rate calculation.

OneBeacon records a valuation allowance against deferred tax assets if it becomes more likely than not that all or a portion of a deferred tax asset will not be realized. Changes in valuation allowances from period to period are included in income tax expense in the period of change. In determining whether or not a valuation allowance, or change therein, is warranted, OneBeacon considers factors such as prior earnings history, expected future earnings, carryback and carryforward periods as well as prudent and economically feasible strategies that, if executed would result in the realization of a deferred tax asset. It is possible that certain planning strategies or projected earnings in certain subsidiaries may not be feasible to utilize the entire deferred tax asset, which could result in material changes to OneBeacon’s deferred tax assets and tax expense.

OneBeacon classifies all interest and penalties on unrecognized tax benefits as part of income tax expense. With few exceptions, OneBeacon is no longer subject to U.S. federal, state or non-U.S. income tax examinations by tax authorities for years before 2013.

NOTE 11. Fair Value of Financial Instruments

OneBeacon carries its financial instruments on its balance sheet at fair value with the exception of its investment in qualified affordable housing projects, which is accounted for using the proportional amortization method, and fixed-rate, long-term indebtedness. For certain financial instruments where quoted market prices are not available, other independent valuation techniques and assumptions are used. Because considerable judgment is used, these estimates are not necessarily indicative of amounts that could be realized in a current market exchange. Certain financial instruments are excluded from disclosure, including insurance contracts.

As of June 30, 2017 and December 31, 2016, the fair value of OneBeacon's 2012 Senior Notes (its fixed-rate, long-term indebtedness) was $282.4 million and $274.2 million, respectively. As described in Note 6—"Debt", the net carrying value of the 2012 Senior Notes was $273.3 million and $273.2 million as of June 30, 2017 and December 31, 2016, respectively. The fair value measurement of the 2012 Senior Notes is classified as Level 2 in the valuation hierarchy and determined based on the closing market price at the end of the fiscal quarter.

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 12. Legal Contingencies

OneBeacon, and the insurance and reinsurance industry in general, is routinely subject to claims related litigation and arbitration in the normal course of business, as well as litigation and arbitration that does not arise from, or directly relate to, claims activity. OneBeacon's estimates of the costs of settling matters routinely encountered in claims activity are reflected in the reserves for unpaid loss and LAE. See Note 3—"Unpaid Loss and Loss Adjustment Expense ("LAE") Reserves."

OneBeacon evaluates its exposure to non-claims related litigation and arbitration and establishes accruals for litigation and arbitration if it is probable that a loss has been incurred and it can be reasonably estimated. Disclosure of litigation and arbitration is made if it is probable that a loss has been incurred or if there is a reasonable possibility that a loss may have been incurred. Although the ultimate outcome of claims and non-claims related litigation and arbitration, and the amount or range of potential loss at any particular time, is often inherently uncertain, management does not believe that the ultimate outcome of such claims and non-claims related litigation and arbitration will have a material adverse effect on OneBeacon's financial position, full year results of operations, or cash flows.

The following summarizes significant ongoing non-claims related litigation or arbitration as of June 30, 2017:

Litigation Related to the OneBeacon Acquisition

 On June 2, 2017, Stephen Bushansky, a purported Company shareholder, filed a class action complaint against the Company and each of the Company’s directors in the U.S. District Court for the District of Minnesota (the “Minnesota Court”), purportedly on behalf of the Company’s public shareholders. Thereafter, three additional lawsuits were filed in the Minnesota Court by additional purported shareholders, Darrin Dickers, Raymond Martino and Robert Berg (collectively with Bushansky, the “Plaintiffs”). The complaints in each pending class action allege that the Company’s preliminary proxy statement filed with the U.S. Securities and Exchange Commission (“SEC”) omitted or misrepresented certain material information, allegedly in violation of Sections 14(a) and 20(a) of the Securities Exchange Act of 1934 and SEC Rule 14a-9 and sought to enjoin the Company and Intact Financial Corporation from closing the OneBeacon Acquisition, or if the Acquisition closes, to award Plaintiffs damages and costs.

On June 26, 2017, Plaintiffs jointly filed a motion for preliminary injunction to enjoin the shareholder vote on the OneBeacon Acquisition, but withdrew their motion on July 7, 2017. Company shareholders approved the OneBeacon Acquisition on July 18, 2017 at a special general meeting of shareholders. Plaintiffs have not dismissed their cases and OneBeacon’s responsive pleadings are due August 14, 2017. The Company believes the cases lack merit and continues to vigorously defend this litigation.

Deutsche Bank Litigation

In June 2011, Deutsche Bank Trust Company Americas, Law Debenture Company of New York and Wilmington Trust Company (collectively referred to as “Plaintiffs”), in their capacity as trustees for certain senior notes issued by the Tribune Company (“Tribune”), filed lawsuits in various jurisdictions (the “Noteholder Actions”) against numerous defendants including OneBeacon, OneBeacon-sponsored benefit plans and other affiliates of White Mountains in their capacity as former shareholders of Tribune seeking recovery of the proceeds from the sale of common stock of Tribune in connection with Tribune's leveraged buyout in 2007 (the “LBO”). Tribune filed for bankruptcy in 2008 in the Delaware bankruptcy court (the “Bankruptcy Court”). The Bankruptcy Court granted Plaintiffs permission to commence these LBO-related actions, and in 2011, the Judicial Panel on Multidistrict Litigation granted a motion to consolidate the actions for pretrial matters and transferred all such proceedings to the United States District Court for the Southern District of New York (the SDNY). Plaintiffs seek recovery of the proceeds received by the former Tribune shareholders on a theory of constructive fraudulent transfer asserting that Tribune purchased or repurchased its common shares without receiving fair consideration at a time when it was, or as a result of the purchases of shares, was rendered, insolvent. OneBeacon has entered into a joint defense agreement with other affiliates of White Mountains that are defendants in the action. OneBeacon and OneBeacon-sponsored benefit plans received approximately $32 million for Tribune common stock tendered in connection with the LBO. The Court granted an omnibus motion to dismiss the Noteholders Action in September 2013 and plaintiffs appealed. On March 29, 2016, a three judge panel of the U.S Second Circuit Court of Appeals affirmed the dismissal of the Noteholders Action. On July 22, 2016, the Plaintiff's petition to the Second Circuit for reconsideration or for a rehearing en banc was denied in full. On September 9, 2016 the Plaintiffs filed for a writ of certiorari, seeking review in the United States Supreme Court.

In addition, OneBeacon, OneBeacon-sponsored benefit plans and other affiliates of White Mountains in their capacity as former shareholders of Tribune, along with thousands of former Tribune shareholders, have been named as defendants in an adversary proceeding brought by the Official Committee of Unsecured Creditors of the Tribune Company (the “Committee”), on behalf of the Tribune Company, which seeks to avoid the repurchase of shares by Tribune in the LBO on a theory of

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 12. Legal Contingencies

intentional fraudulent transfer (the “Committee Action”). Tribune emerged from bankruptcy in 2012, and a litigation trustee replaced the Committee as plaintiff in the Committee Action. This matter was consolidated for pretrial matters with the Noteholder Actions in the SDNY and was stayed pending the motion to dismiss in the Noteholder Action. An omnibus motion to dismiss the shareholder defendants in the Committee Action was filed in May 2014 and the motion was granted on January 6, 2017. The plaintiff has requested permission to move the SDNY to certify the decision as a final judgment capable of immediate appeal. No amount has been accrued in connection with this matter as of June 30, 2017, as the amount of loss, if any, cannot be reasonably estimated.

NOTE 13. Earnings per Share

Basic and diluted earnings per share amounts are based on the weighted average number of common shares outstanding, including unvested restricted shares that are considered participating securities. Diluted earnings per share amounts are based on the weighted average number of common shares including unvested restricted shares.

The following table outlines the Company's computation of earnings per share for net income attributable to OneBeacon's common shareholders for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Earnings attributable to OneBeacon's common shareholders—basic and diluted (in millions):
Net income (loss) attributable to OneBeacon's common shareholders	$	(0.1	)	$	24.5		$	32.0		$	70.9
Allocation of income for participating unvested restricted common shares	—			(0.1		)	(0.2		)	(0.3		)
Dividends paid on participating restricted common shares	(0.2		)	(0.1		)	(0.3		)	(0.1		)
Total allocation to restricted common shares	(0.2		)	(0.2		)	(0.5		)	(0.4		)
Net income (loss) attributable to OneBeacon's common shareholders, net of restricted common share amounts	$	(0.3	)	$	24.3		$	31.5		$	70.5
Undistributed net earnings (in millions):
Net income attributable to OneBeacon's common shareholders, net of restricted common share amounts	$	(0.3	)	$	24.3		$	31.5		$	70.5
Dividends paid, net of restricted common share amounts	(19.7		)	(19.7		)	(39.5		)	(39.5		)
Total undistributed (overdistributed) net earnings, net of restricted common share amounts	$	(20.0	)	$	4.6		$	(8.0	)	$	31.0
Earnings per share denominator—basic and diluted (in millions):
Total weighted average common shares outstanding	94.7			94.3			94.6			94.4
Weighted average unvested restricted common shares(1)	(0.7		)	(0.4		)	(0.6		)	(0.4		)
Basic and diluted earnings per share denominator	94.0			93.9			94.0			94.0
Earnings per share attributable to OneBeacon's common shareholders—basic and diluted (in dollars):
Net income attributable to OneBeacon's common shareholders	$	—		$	0.26		$	0.34		$	0.75
Dividends declared and paid	(0.21		)	(0.21		)	(0.42		)	(0.42		)
Undistributed (overdistributed) earnings	$	(0.21	)	$	0.05		$	(0.08	)	$	0.33

_______________________________________________________________________________

⁽¹⁾  Restricted shares outstanding vest in equal installments upon a stated date or upon the occurrence of a specified event.

37

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 14. Common Shareholders' Equity and Noncontrolling Interest

Common Shares Repurchased and Retired

On August 22, 2007, the Company's Board authorized the repurchase of up to $200.0 million of its Class A common shares from time to time, subject to market conditions. Shares may be repurchased on the open market or through privately negotiated transactions. This authorization does not have a stated expiration date. No shares were repurchased under the share repurchase authorization during the six months ended June 30, 2017. During the six months ended June 30, 2016, 850,349 shares were repurchased under the share repurchase authorization for $10.6 million at an average share price of $12.42. The amount of authorization remaining is $75.0 million as of June 30, 2017.

During the six months ended June 30, 2017 and 2016, the Company repurchased 67,273 and 64,981 common shares, respectively, for $1.1 million and $0.9 million, to satisfy employee income tax withholding, pursuant to employee benefit plans. Shares repurchased pursuant to employee benefit plans do not reduce the board authorization referred to above.

Dividends on Common Shares

During the six months ended June 30, 2017 and 2016 the Company declared and paid cash dividends to OneBeacon shareholders of 0.42 per common share for a total of $39.8 million and $39.6 million, respectively.

Accumulated Other Comprehensive Loss

The pre-tax components of the Company's other comprehensive income and the related tax expense are as follows:

	Six months ended June 30,
($ in millions)	2017			2016
Net change in benefit plan assets and obligations	$	0.4		$	0.3
Income tax expense	(0.1		)	(0.1		)
Net change in benefit plan assets and obligations, net of tax	$	0.3		$	0.2

Noncontrolling Interests

On June 30, 2017, A.W.G. Dewar, Inc. ("Dewar"), which is consolidated within OneBeacon's financial statements, repurchased $4.1 million of stock from Dewar management. As a result of the repurchase, OneBeacon owns approximately 89% of Dewar as of June 30, 2017, an increase from ownership of 81% as of December 31, 2016.

NOTE 15. Consolidating Financial Information

The Company has fully and unconditionally guaranteed the 2012 Senior Notes issued by its 100% owned subsidiary, OBH, as well as any draw made by OBH on the Credit Facility, which was undrawn as of June 30, 2017. The following tables present OneBeacon's consolidating balance sheets as of June 30, 2017 and December 31, 2016 and statements of operations and comprehensive income for the three and six months ended June 30, 2017 and 2016 and cash flows for the six months ended June 30, 2017 and 2016. These financial statements reflect the Company's ("guarantor") financial position, results of operations and cash flows on a stand-alone basis, that of OBH ("the issuer") and of the Company's other entities ("non-guarantor subsidiaries") as well as the necessary consolidating adjustments to eliminate intercompany balances and transactions.

38

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Balance Sheet As of June 30, 2017 (in millions)	The Company (guarantor)		Non-guarantor subsidiaries			OBH (issuer)		Consolidating adjustments			Consolidated
Assets
Investment Securities:
Fixed maturity investments, at fair value	$	—	$	2,288.6		$	—	$	—		$	2,288.6
Short-term investments, at amortized cost (which approximates fair value)	5.4		44.2			5.9		—			55.5
Common equity securities, at fair value	—		205.5			—		—			205.5
Other investments	—		134.1			—		—			134.1
Total investment securities	5.4		2,672.4			5.9		—			2,683.7
Cash	—		71.2			0.1		—			71.3
Reinsurance recoverables	—		198.0			—		—			198.0
Premiums receivable	—		245.4			—		—			245.4
Deferred acquisition costs	—		106.9			—		—			106.9
Ceded unearned premiums	—		56.6			—		—			56.6
Net deferred tax asset	—		130.0			—		0.1			130.1
Investment income accrued	—		12.9			—		—			12.9
Accounts receivable on unsettled investment sales	—		5.8			—		—			5.8
Investments in subsidiaries	1,015.6		—			966.9		(1,982.5		)	—
Other assets	0.6		184.0			1.1		—			185.7
Total assets	$	1,021.6	$	3,683.2		$	974.0	$	(1,982.4	)	$	3,696.4
Liabilities
Unpaid loss and loss adjustment expense reserves	$	—	$	1,411.2		$	—	$	—		$	1,411.2
Unearned premiums	—		595.2			—		—			595.2
Funds held under insurance contracts	—		210.2			—		—			210.2
Debt	—		—			273.3		—			273.3
Accounts payable on unsettled investment purchases	—		9.3			—		—			9.3
Other liabilities	6.5		171.0			4.9		—			182.4
Total liabilities	6.5		2,396.9			278.2		—			2,681.6
OneBeacon's common shareholders' equity and noncontrolling interests
Total OneBeacon's common shareholders' equity	1,015.1		1,286.6			695.8		(1,982.4		)	1,015.1
Total noncontrolling interests	—		(0.3		)	—		—			(0.3		)
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,015.1		1,286.3			695.8		(1,982.4		)	1,014.8
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$	1,021.6	$	3,683.2		$	974.0	$	(1,982.4	)	$	3,696.4

39

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Balance Sheet As of December 31, 2016 (in millions)	The Company (guarantor)		Non-guarantor subsidiaries		OBH (issuer)		Consolidating adjustments			Consolidated
Assets
Investment Securities:
Fixed maturity investments, at fair value	$	—	$	2,169.1	$	—	$	—		$	2,169.1
Short-term investments, at amortized cost (which approximates fair value)	2.5		108.1		1.5		—			112.1
Common equity securities, at fair value	—		188.7		—		—			188.7
Other investments	—		150.5		—		—			150.5
Total investment securities	2.5		2,616.4		1.5		—			2,620.4
Cash	—		69.5		0.1		—			69.6
Reinsurance recoverables	—		179.5		—		—			179.5
Premiums receivable	—		228.3		—		—			228.3
Deferred acquisition costs	—		96.3		—		—			96.3
Ceded unearned premiums	—		44.2		—		—			44.2
Net deferred tax asset	—		126.6		—		0.1			126.7
Investment income accrued	—		11.3		—		—			11.3
Accounts receivable on unsettled investment sales	—		1.4		—		—			1.4
Investments in subsidiaries	1,018.8		—		989.4		(2,008.2		)	—
Other assets	0.4		211.4		0.4		—			212.2
Total assets	$	1,021.7	$	3,584.9	$	991.4	$	(2,008.1	)	$	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves	$	—	$	1,365.6	$	—	$	—		$	1,365.6
Unearned premiums	—		575.1		—		—			575.1
Funds held under insurance contracts	—		153.0		—		—			153.0
Debt	—		—		273.2		—			273.2
Other liabilities	0.4		190.6		6.8		—			197.8
Total liabilities	0.4		2,284.3		280.0		—			2,564.7
OneBeacon's common shareholders' equity and noncontrolling interests
Total OneBeacon's common shareholders' equity	1,021.3		1,296.7		711.4		(2,008.1		)	1,021.3
Total noncontrolling interests	—		3.9		—		—			3.9
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,021.3		1,300.6		711.4		(2,008.1		)	1,025.2
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$	1,021.7	$	3,584.9	$	991.4	$	(2,008.1	)	$	3,589.9

40

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Statement of Operations and Comprehensive Income (Loss) Three months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	277.4		$	—		$	—		$	277.4
Net investment income	—			14.5			—			—			14.5
Net realized and change in unrealized investment gains	—			12.3			—			—			12.3
Net other revenues	—			2.1			—			—			2.1
Total revenues	—			306.3			—			—			306.3
Expenses
Loss and loss adjustment expenses	—			188.6			—			—			188.6
Policy acquisition expenses	—			48.4			—			—			48.4
Other underwriting expenses	—			59.6			—			—			59.6
General and administrative expenses	6.5			2.2			0.1			—			8.8
Interest expense	—			—			3.3			—			3.3
Total expenses	6.5			298.8			3.4			—			308.7
Pre-tax income (loss)	(6.5		)	7.5			(3.4		)	—			(2.4		)
Income tax benefit	—			1.5			1.2			—			2.7
Income (loss) before equity in earnings of unconsolidated affiliates	(6.5		)	9.0			(2.2		)	—			0.3
Equity in earnings of subsidiaries, net of tax	6.4			—			0.5			(6.9		)	—
Net income including noncontrolling interests	(0.1		)	9.0			(1.7		)	(6.9		)	0.3
Less: Net income attributable to noncontrolling interests	—			(0.4		)	—			—			(0.4		)
Net income (loss) attributable to OneBeacon's common shareholders	(0.1		)	8.6			(1.7		)	(6.9		)	(0.1		)
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	0.1		$	8.6		$	(1.5	)	$	(7.1	)	$	0.1

41

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Statement of Operations and Comprehensive Income Three months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	271.4		$	—		$	—		$	271.4
Net investment income	—			12.1			—			—			12.1
Net realized and change in unrealized investment gains	—			24.7			—			—			24.7
Net other revenues	—			0.8			—			—			0.8
Total revenues	—			309.0			—			—			309.0
Expenses
Loss and loss adjustment expenses	—			179.7			—			—			179.7
Policy acquisition expenses	—			48.7			—			—			48.7
Other underwriting expenses	—			50.9			—			—			50.9
General and administrative expenses	1.2			2.1			0.2			—			3.5
Interest expense	—			—			3.2			—			3.2
Total expenses	1.2			281.4			3.4			—			286.0
Pre-tax income (loss)	(1.2		)	27.6			(3.4		)	—			23.0
Income tax benefit	—			—			2.0			—			2.0
Net income (loss) before equity in earnings of unconsolidated affiliates	(1.2		)	27.6			(1.4		)	—			25.0
Equity in earnings of subsidiaries, net of tax	25.7			—			18.0			(43.7		)	—
Net income including noncontrolling interests	24.5			27.6			16.6			(43.7		)	25.0
Less: Net income attributable to noncontrolling interests	—			(0.5		)	—			—			(0.5		)
Net income attributable to OneBeacon's common shareholders	24.5			27.1			16.6			(43.7		)	24.5
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	24.7		$	27.1		$	16.8		$	(43.9	)	$	24.7

42

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Statement of Operations and Comprehensive Income Six months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	539.2		$	—		$	—		$	539.2
Net investment income	—			26.7			—			—			26.7
Net realized and change in unrealized investment gains	—			27.3			—			—			27.3
Net other revenues	—			5.5			—			—			5.5
Total revenues	—			598.7			—			—			598.7
Expenses
Loss and loss adjustment expenses	—			339.2			—			—			339.2
Policy acquisition expenses	—			93.7			—			—			93.7
Other underwriting expenses	—			111.3			—			—			111.3
General and administrative expenses	9.4			4.2			0.2			—			13.8
Interest expense	—			—			6.6			—			6.6
Total expenses	9.4			548.4			6.8			—			564.6
Pre-tax income (loss)	(9.4		)	50.3			(6.8		)	—			34.1
Income tax benefit (expense)	—			(3.8		)	2.6			—			(1.2		)
Net income (loss) before equity in earnings of unconsolidated affiliates	(9.4		)	46.5			(4.2		)	—			32.9
Equity in earnings of subsidiaries, net of tax	41.4			—			11.7			(53.1		)	—
Net income including noncontrolling interests	32.0			46.5			7.5			(53.1		)	32.9
Less: Net income attributable to noncontrolling interests	—			(0.9		)	—			—			(0.9		)
Net income attributable to OneBeacon's common shareholders	32.0			45.6			7.5			(53.1		)	32.0
Other comprehensive income, net of tax	0.3			—			0.3			(0.3		)	0.3
Comprehensive income attributable to OneBeacon's common shareholders	$	32.3		$	45.6		$	7.8		$	(53.4	)	$	32.3

43

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Statement of Operations and Comprehensive Income Six months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	550.0		$	—		$	—		$	550.0
Net investment income	—			26.5			—			—			26.5
Net realized and change in unrealized investment gains	—			41.3			—			—			41.3
Net other revenues	—			1.7			—			—			1.7
Total revenues	—			619.5			—			—			619.5
Expenses
Loss and loss adjustment expenses	—			338.5			—			—			338.5
Policy acquisition expenses	—			99.7			—			—			99.7
Other underwriting expenses	—			106.2			—			—			106.2
General and administrative expenses	2.4			4.8			0.2			—			7.4
Interest expense	—			—			6.5			—			6.5
Total expenses	2.4			549.2			6.7			—			558.3
Pre-tax income (loss)	(2.4		)	70.3			(6.7		)	—			61.2
Income tax benefit	—			7.1			3.6			—			10.7
Net income (loss) before equity in earnings of unconsolidated affiliates	(2.4		)	77.4			(3.1		)	—			71.9
Equity in earnings of subsidiaries, net of tax	73.3			—			40.7			(114.0		)	—
Net income including noncontrolling interests	70.9			77.4			37.6			(114.0		)	71.9
Less: Net income attributable to noncontrolling interests	—			(1.0		)	—			—			(1.0		)
Net income attributable to OneBeacon's common shareholders	70.9			76.4			37.6			(114.0		)	70.9
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	71.1		$	76.4		$	37.8		$	(114.2	)	$	71.1

44

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Statement of Cash Flows Six months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Cash flows from operations:
Net income including noncontrolling interests	$	32.0		$	46.5		$	7.5		$	(53.1	)	$	32.9
Charges (credits) to reconcile net income to cash flows provided from (used for) operations:
Undistributed earnings from subsidiaries	(41.4		)	—			(11.7		)	53.1			—
Net realized and change in unrealized investment gains	—			(27.3		)	—			—			(27.3		)
Deferred income tax benefit	—			(2.6		)	—			—			(2.6		)
Dividends received from subsidiaries	45.0			—			—			(45.0		)	—
Other operating items:
Net change in loss and LAE reserves	—			45.6			—			—			45.6
Net change in unearned premiums	—			20.1			—			—			20.1
Net change in ceded unearned premiums	—			(12.4		)	—			—			(12.4		)
Net change in premiums receivable	—			(17.1		)	—			—			(17.1		)
Net change in reinsurance recoverables on paid and unpaid losses	—			(18.5		)	—			—			(18.5		)
Net change in funds held under insurance contracts	—			57.2			—			—			57.2
Net change in other assets and liabilities	8.2			2.5			(2.4		)	—			8.3
Net cash provided from (used for) operations	43.8			94.0			(6.6		)	(45.0		)	86.2
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	(2.9		)	63.9			(4.4		)	—			56.6
Maturities of fixed maturity investments	—			158.6			—			—			158.6
Sales of fixed maturity investments	—			686.1			—			—			686.1
Sales of common equity securities	—			5.8			—			—			5.8
Return of capital and distributions of other investments	—			13.5			—			—			13.5
Purchases of fixed maturity investments	—			(957.9		)	—			—			(957.9		)
Purchases of common equity securities	—			(6.2		)	—			—			(6.2		)
Contributions for other investments	—			(0.9		)	—			—			(0.9		)
Net change in unsettled investment purchases and sales	—			4.8			—			—			4.8
Net acquisitions of property and equipment	—			(4.0		)	—			—			(4.0		)
Capital contribution from parent	—			23.5			34.5			(58.0		)	—
Net cash provided from (used for) investing activities	(2.9		)	(12.8		)	30.1			(58.0		)	(43.6		)
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.8		)	—			—			—			(39.8		)
Cash dividends paid to parent	—			(45.0		)	—			45.0			—
Capital contribution to subsidiary	—			(34.5		)	(23.5		)	58.0			—
Repurchases and retirements of common stock	(1.1		)	—			—			—			(1.1		)
Payments on capital lease obligation	—			—			—			—			—
Net cash used for financing activities	(40.9		)	(79.5		)	(23.5		)	103.0			(40.9		)
Net increase in cash during period	—			1.7			—			—			1.7
Cash balance at beginning of period	—			69.5			0.1			—			69.6
Cash balance at end of period	$	—		$	71.2		$	0.1		$	—		$	71.3

45

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 15. Consolidating Financial Information

Consolidating Statement of Cash Flows Six months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Cash flows from operations:
Net income including noncontrolling interests	$	70.9		$	77.4		$	37.6		$	(114.0	)	$	71.9
Charges (credits) to reconcile net income to cash flows provided from (used for) operations:
Undistributed earnings from subsidiaries	(73.3		)	—			(40.7		)	114.0			—
Net realized and change in unrealized investment gains	—			(41.3		)	—			—			(41.3		)
Deferred income tax expense	—			19.2			—			—			19.2
Dividends received from subsidiaries	51.0			—			—			(51.0		)	—
Other operating items:
Net change in loss and LAE reserves	—			(13.2		)	—			—			(13.2		)
Net change in unearned premiums	—			(3.9		)	—			—			(3.9		)
Net change in ceded unearned premiums	—			(5.0		)	—			—			(5.0		)
Net change in premiums receivable	—			(19.9		)	—			—			(19.9		)
Net change in reinsurance recoverables on paid and unpaid losses	—			10.0			—			—			10.0
Net change in funds held under insurance contracts	—			3.2			—			—			3.2
Net change in other assets and liabilities	1.2			(35.4		)	(4.1		)	—			(38.3		)
Net cash provided from (used for) operations	49.8			(8.9		)	(7.2		)	(51.0		)	(17.3		)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	1.3			(47.8		)	1.1			—			(45.4		)
Maturities of fixed maturity investments	—			229.5			—			—			229.5
Sales of fixed maturity investments	—			218.8			24.2			(42.5		)	200.5
Sales of common equity securities	—			174.4			—			—			174.4
Return of capital and distributions of other investments	—			7.0			—			—			7.0
Purchases of fixed maturity investments	—			(473.6		)	(18.3		)	42.5			(449.4		)
Purchases of common equity securities	—			(109.5		)	—			—			(109.5		)
Contributions for other investments	—			(0.4		)	—			—			(0.4		)
Net change in unsettled investment purchases and sales	—			42.5			—			—			42.5
Net acquisitions of property and equipment	—			(2.1		)	—			—			(2.1		)
Capital contribution from parent	—			27.3			28.5			(55.8		)	—
Net cash provided from investing activities	1.3			66.1			35.5			(55.8		)	47.1
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.6		)	—			—			—			(39.6		)
Cash dividends paid to parent	—			(51.0		)	—			51.0			—
Capital contribution to subsidiary	—			(28.5		)	(27.3		)	55.8			—
Repurchases and retirements of common stock	(11.5		)	—			—			—			(11.5		)
Payments on capital lease obligation	—			(1.0		)	—			—			(1.0		)
Net cash used for financing activities	(51.1		)	(80.5		)	(27.3		)	106.8			(52.1		)
Net increase (decrease) in cash during period	—			(23.3		)	1.0			—			(22.3		)
Cash balance at beginning of period	—			94.6			0.6			—			95.2
Cash balance at end of period	$	—		$	71.3		$	1.6		$	—		$	72.9

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ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion contains "forward-looking statements." Statements that are not historical in nature are forward-looking statements. OneBeacon Insurance Group, Ltd. (the "Company" or the "Registrant") and its subsidiaries (collectively, "OneBeacon") cannot promise that its expectations in such forward-looking statements will turn out to be correct. OneBeacon's actual results could be materially different from and worse than its expectations. See "Forward-Looking Statements" on page 66 for specific important factors that could cause actual results to differ materially from those contained in forward-looking statements.

Overview—OneBeacon Acquisition

On May 2, 2017, Intact Financial Corporation (“Intact”), which is based in Toronto, Ontario, Canada and is the largest provider of property and casualty insurance in Canada, and the Company, announced that they had entered into a definitive merger agreement ("Merger Agreement") which provides for the merger of an indirect subsidiary of Intact with and into the Company, following the satisfaction of various closing conditions, (the “OneBeacon Acquisition”).

Under the terms of the Merger Agreement, which has been approved by the board of directors of both companies, OneBeacon shareholders will be entitled to receive $18.10 for each outstanding share of our common stock. Aggregate cash consideration to OneBeacon shareholders is anticipated to be approximately $1.7 billion. The OneBeacon Acquisition is expected to be completed in the third quarter or early in the fourth quarter of 2017.

The closing of the OneBeacon Acquisition is subject to the satisfaction of various closing conditions, including the approval by the Company’s shareholders, which occurred on July 18, 2017, as well as the approval of various insurance regulatory authorities and other closing conditions customary for a transaction of this type. Pursuant to the Merger Agreement, the Company is required to carry on its business in the ordinary course consistent with past practice, in all material respects; however, certain actions are restricted or may not be taken without Intact's prior written consent. See also Note 2—"OneBeacon Acquisition" and "Liquidity and Capital Resources"—"Financing and Capital Items"

Overview—Three months ended June 30, 2017 versus three months ended June 30, 2016

We ended the second quarter of 2017 with a book value per share of $10.71, reflecting a 0.1% increase, including a quarterly dividend of $0.21 per share, for the three months ended June 30, 2017.

Net loss attributable to OneBeacon's common shareholders was $0.1 million for the second quarter of 2017, compared to net income of $24.5 million for the second quarter of 2016. Pre-tax underwriting loss of $19.2 million for the second quarter of 2017, reflecting a combined ratio of 106.9%, compared to pre-tax underwriting loss of $7.9 million for the second quarter of 2016, reflecting a combined ratio of 102.9%. The change in pre-tax underwriting results for the second quarter of 2017 was driven by higher current accident year non-catastrophe and catastrophe losses as well as higher expenses in the current year period.

Pre-tax net investment return was $26.8 million for the second quarter of 2017, representing a 1.1% total return on average invested assets, compared to $36.8 million for the second quarter of 2016, representing a 1.5% total return on average invested assets. The slight decrease from the prior year period was primarily driven by the fixed maturity investments portfolio driven by interest rate movements in the respective periods and a decreased return in our other investments portfolio driven by the surplus notes. These decreases were partially offset by a higher return in our common equity securities portfolio which benefited from stronger market performance (as measured by the S&P 500 total return index) as compared to the 2016 period.

Overview—Six months ended June 30, 2017 versus six months ended June 30, 2016

We ended the first six months of 2017 with a book value per share of $10.71, reflecting a 2.9% increase, including quarterly dividends totaling $0.42 per share, for the six months ended June 30, 2017.

Net income attributable to OneBeacon's common shareholders was $32.0 million for the six months ended June 30, 2017, compared to $70.9 million for the six months ended June 30, 2016. Pre-tax underwriting loss of $5.0 million for the six months ended June 30, 2017, reflecting a combined ratio of 100.9%, compared to pre-tax underwriting income of $5.6 million for the six months ended June 30, 2016, reflecting a combined ratio of 98.9%. The change in pre-tax underwriting results for the six months ended June 30, 2017 was driven by higher current accident year non-catastrophe and catastrophe losses as well as higher expenses in the current year period.

Pre-tax net investment return was $54.0 million for the six months ended June 30, 2017, representing a 2.1% total return on average invested assets, compared to $67.8 million for the six months ended June 30, 2016, representing a 2.7% total return on average invested assets. The decrease from the prior year period was primarily driven by the impact of interest rate movements on the fixed maturity investments portfolio in the respective periods and a decreased return in our other investments portfolio driven by the surplus notes. These decreases were partially offset by a higher return in our common

47

equity securities portfolio which benefited from stronger market performance (as measured by the S&P 500 total return index) as compared to the 2016 period.

Book Value Per Share

The following table presents our book value per share:

(in millions except per share amounts)	June 30,  2017		March 31, 2017		December 31, 2016
Numerator
OneBeacon's common shareholders' equity	$	1,015.1	$	1,033.4	$	1,021.3
Denominator
Common shares outstanding(1)	94.7		94.7		94.3
Book value per share(1)	$	10.71	$	10.91	$	10.82
Dividends paid per share, year-to-date	$	0.42	$	0.21	$	0.84

_______________________________________________________________________________

⁽¹⁾  Common shares outstanding includes unvested restricted shares.

48

Results of Operations

Review of Consolidated Results

A summary of our consolidated financial results for the three and six months ended June 30, 2017 and 2016 is as follows:

	Three months ended  June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Gross written premiums(1)	$	322.9		$	286.0		$	620.2		$	596.5
Net written premiums(1)	$	290.1		$	261.0		$	547.0		$	541.1
Revenues
Earned premiums	$	277.4		$	271.4		$	539.2		$	550.0
Net investment income	14.5			12.1			26.7			26.5
Net realized and change in unrealized investment gains	12.3			24.7			27.3			41.3
Net other revenues	2.1			0.8			5.5			1.7
Total revenues	306.3			309.0			598.7			619.5
Expenses
Loss and loss adjustment expense (LAE)	188.6			179.7			339.2			338.5
Policy acquisition expenses	48.4			48.7			93.7			99.7
Other underwriting expenses	59.6			50.9			111.3			106.2
General and administrative expenses	8.8			3.5			13.8			7.4
Interest expense	3.3			3.2			6.6			6.5
Total expenses	308.7			286.0			564.6			558.3
Pre-tax income (loss)	(2.4		)	23.0			34.1			61.2
Income tax (expense) benefit	2.7			2.0			(1.2		)	10.7
Net income including noncontrolling interests	0.3			25.0			32.9			71.9
Less: Net income attributable to noncontrolling interests	(0.4		)	(0.5		)	(0.9		)	(1.0		)
Net income (loss) attributable to OneBeacon's common shareholders	(0.1		)	24.5			32.0			70.9
Other comprehensive income, net of tax	0.2			0.2			0.3			0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	0.1		$	24.7		$	32.3		$	71.1

_______________________________________________________________________________

⁽¹⁾  Gross and net written premiums are operating metrics used by the Company to measure business volume. The gross written premium metric is calculated by totaling all premium amounts, both direct and assumed, that customers are required to pay for policies that are written, or bound, during the relevant accounting period, with the net written premium metric being net of amounts ceded to reinsurance companies.

A summary of our consolidated underwriting income and pre-tax income is as follows:

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Earned premiums	$	277.4		$	271.4		$	539.2		$	550.0
Loss and LAE	(188.6		)	(179.7		)	(339.2		)	(338.5		)
Policy acquisition expenses	(48.4		)	(48.7		)	(93.7		)	(99.7		)
Other underwriting expenses	(59.6		)	(50.9		)	(111.3		)	(106.2		)
Pre-tax underwriting income (loss)	(19.2		)	(7.9		)	(5.0		)	5.6
Net investment income	14.5			12.1			26.7			26.5
Net realized and change in unrealized investment gains	12.3			24.7			27.3			41.3
Net other revenues	2.1			0.8			5.5			1.7
General and administrative expenses	(8.8		)	(3.5		)	(13.8		)	(7.4		)
Interest expense	(3.3		)	(3.2		)	(6.6		)	(6.5		)
Pre-tax income (loss)	$	(2.4	)	$	23.0		$	34.1		$	61.2

49

The following table provides our consolidated underwriting ratios for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Underwriting ratios(1)
Loss and LAE	68.0	%	66.2	%	62.9	%	61.5	%
Expense	38.9		36.7		38.0		37.4
Total combined ratio	106.9	%	102.9	%	100.9	%	98.9	%

_______________________________________________________________________________

⁽¹⁾  Underwriting ratios are used to measure the components of underwriting profitability and include: the loss and LAE ratio, calculated by dividing loss and LAE by earned premiums; the expense ratio, calculated by dividing policy acquisition and other underwriting expenses by earned premiums; and the combined ratio, the sum of the loss and LAE ratio and the expense ratio.

The impact of certain items to our underwriting ratios was as follows:

	Three months ended June 30,		Six months ended June 30,
(Favorable) unfavorable impact	2017	2016	2017	2016
Point impact on loss and LAE ratio and combined ratio:
Catastrophe losses, net of reinsurance	3.8 pts	1.9 pts	2.2 pts	1.4 pts
Prior year loss reserve development	2.6 pts	5.7 pts	1.4 pts	2.8 pts

Consolidated Results—Three months ended June 30, 2017 versus three months ended June 30, 2016

Our comprehensive income attributable to OneBeacon's common shareholders was $0.1 million for the second quarter of 2017 compared to $24.7 million for the second quarter of 2016, with the change driven primarily by lower underwriting results and investment returns. Pre-tax investment results decreased $10.0 million due to lower returns in the fixed maturity investments and other investments portfolios but were partially offset by higher returns in the common equity securities portfolio driven by the factors discussed below in "Summary of Investment Results." Pre-tax underwriting results decreased by $11.3 million in the second quarter of 2017 driven by adverse impacts from Entertainment, Government Risks, Financial Institutions, and Programs, as described in more detail below, along with higher incentive compensation expenses due primarily to the impact of the OneBeacon Acquisition. These adverse impacts were partially off-set by favorable relative results from Healthcare, which experienced significant unfavorable development in the prior period and less unfavorable development in the current period. As a result of continued under-performance in our Programs business, we are considering strategic alternatives for that business.

Our total revenues of $306.3 million for the second quarter of 2017 decreased $2.7 million from $309.0 million for the 2016 period, due primarily to a decrease in net realized and change in unrealized investment gains of $12.4 million driven bythe factors described below, partially offset by an increase in earned premiums of $6.0 million or 2.2% compared to the second quarter of 2016, due to the prior period including a negative $7.0 million adjustment related to return Healthcare premium, as well as higher return ceded premiums under reinsurance policies in the current period of $7.9 million but only benefited the prior year period by $3.4 million, and all of which were fully earned in the respective periods. These favorable impacts were partially off-set by the earned effect of recently lower written premium generally due to refocusing our sales activity on more desirable risks.

Written Premiums

Consolidated net written premiums were $290.1 million in the second quarter of 2017, with the increase of 11.1% from the comparative prior year period driven by increases in Surety ($6.1 million), and Management Liability ($5.2 million) due to strength in both renewals and new business. In addition, return ceded premiums benefited the second quarter of 2017 by $7.9 million, but only benefited the prior year period by $3.4 million, while the prior year period was impacted by a $7 million adverse return Healthcare premium.

Underwriting Results

Pre-tax underwriting loss was $19.2 million for the second quarter of 2017, compared to $7.9 million for the second quarter of 2016 driven by the factors discussed below.

Our combined ratio for the second quarter of 2017 of 106.9% reflected a 68.0% loss and LAE ratio and a 38.9% expense ratio, which compared to a combined ratio for the second quarter of 2016 of 102.9%, consisting of a 66.2% loss and LAE ratio and a 36.7% expense ratio.

50

The 1.8 point increase in the loss and LAE ratio was comprised of a 3.0 point increase in current accident year non-catastrophe losses, and a 1.9 point increase in catastrophe losses, offset by a 3.1 point decrease in prior accident year losses.

Current accident year non-catastrophe losses for the second quarter of 2017 of $170.9 million, or 61.6 points, compared to $159.0 million, or 58.6 points, for the 2016 period. The increased current accident year non-catastrophe loss ratio was primarily driven by increased losses in our Financial Institutions,Healthcare, and Programs businesses.

There were 2.6 points of net unfavorable prior year loss and LAE reserve development, or $7.3 million, in the second quarter of 2017 driven by Programs due to increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs. This compared to 5.7 points of net unfavorable prior year loss and LAE reserve development in the second quarter of 2016, due to the Healthcare operating segment, which recorded $24.0 million of net unfavorable loss reserve development as a result of increasing claim frequency, as well as higher than expected paid and case activity, most notably within the senior living sub-line, which provides medical malpractice and general liability insurance for extended care facilities, including assisted living, memory care and continuing care facilities. As a result of the continuing loss activity experienced in this sub-line, an in-depth claim file review was performed at that time which confirmed that the increased case incurred was driven by frequency of claims, especially in the more recent prior accident years, as opposed to other potential considerations such as changes in claims-handling practices. In addition, a thorough actuarial review was completed, including analysis of the results of enhancements made to the predictive model deployed in the senior living sub-line. Adverse financial results were primarily observed in high-risk categories of business and in difficult geographic venues identified by the predictive model data. As a result of these analyses, management increased its best estimate of prior accident year losses during the prior year period, and increased its loss provisions for the current accident year based on the updated actuarial indications. Also within the Healthcare operating segment, there were two large claims within the managed care errors and omissions sub-line related to unexpected outcomes from mediation and extended costs associated with claim defense, which contributed to the unfavorable development in prior accident years. In addition, there were two large auto-related accounts within Programs that experienced adverse claim activity.

Catastrophe losses of $10.4 million, or 3.8 points, in the second quarter of 2017, compared to $5.3 million, or 1.9 points, for the second quarter of 2016, with the increase being driven by a large hail storm in Texas impacting Government Risk.

The expense ratio increased 2.2 points to 38.9% for the second quarter of 2017, compared to 36.7% for the second quarter of 2016, driven by higher incentive compensation expense related to the OneBeacon Acquisition discussed in Note 2—"OneBeacon Acquisition."

Investments

Net investment income increased to $14.5 million for the second quarter of 2017, compared to $12.1 million for the second quarter of 2016. Net realized and change in unrealized investment gains of $12.3 million for the second quarter of 2017, compared to $24.7 million for the second quarter of 2016. The decrease was driven by a lower return in our fixed maturity investments portfolio driven by relative interest rate movements in the second quarter of 2017 compared to the second quarter of 2016, as well as surplus notes, within our other investments portfolio, which experienced a smaller positive valuation adjustment during the second quarter of 2017 of $0.9 million as opposed to $11.0 million in the prior period. These decreases were partially offset by a higher return in our common equity securities portfolio which benefited from stronger market performance (as measured by the S&P 500 total return index) as compared to 2016.

Other Revenues

Other revenues increased $1.3 million in the second quarter of 2017 compared to the second quarter of 2016, driven by income for the second quarter of 2017 from the excess invested assets remaining after the termination of the OneBeacon qualified pension plan (Qualified Plan).

General and Administrative Expenses

The Company accrued $5.0 million of general and administrative expenses, related substantially to legal and banker fees, during the quarter ended June 30, 2017 in conjunction with the transaction described in Note 2—"OneBeacon Acquisition."

Income Taxes

Our income tax benefit related to pre-tax income represented a net effective tax rate of 112.5% for the second quarter of 2017 compared to a net effective tax rate of (8.7)% for the second quarter of 2016. The effective tax rate for the second quarter of 2017 and 2016 were lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income and underwriting income taxed in a jurisdiction with a lower effective tax rate and, for the second quarter of 2016, the impact of a $3.5 million favorable settlement of the IRS examinations for the 2010 through 2012 tax years. The effective tax rate on non-U.S. income for the second quarter of 2017 and 2016 was 0.7% and 0.5%, respectively.

51

Consolidated Results—Six months ended June 30, 2017 versus six months ended June 30, 2016

Our comprehensive income attributable to OneBeacon's common shareholders was $32.3 million for the six months ended June 30, 2017 compared to $71.1 million for the six months ended June 30, 2016, with the change driven primarily by a $16.3 million tax benefit in the second quarter of 2016 resulting from the settlement of an IRS examination for tax years 2007 through 2012, lower underwriting results, and lower investment returns. Pre-tax investment results decreased $13.8 million during the same period due to lower returns in the fixed maturity investments and other investments portfolios but were partially offset by higher returns in the common equity securities portfolio driven by the factors discussed below in "Summary of Investment Results." Pre-tax underwriting results decreased by $10.6 million in the six months ended June 30, 2017 compared to the 2016 period, driven by the factors discussed below. While most of our businesses contributed strong relative performance year over year, the favorable results were mostly offset by the performance of our Government Risks business which was negatively impacted by claims related to wind and thunderstorms in Texas in the six months ended June 30, 2017. Both of the six months ending June 30, 2017 and 2016 were also adversely impacted by the poor performance of our Healthcare, and to a lesser extent, our Programs business as described below.

Our total revenues of $598.7 million for the six months ended June 30, 2017 decreased $20.8 million from $619.5 million for the 2016 period, primarily due to a decrease in net realized and change in unrealized investment gains of $14.0 million driven by the factors described below, as well as a decrease in earned premiums of $10.8 million or 2.0% compared to the six months ended June 30, 2016. The decrease in earned premiums was due to the earned effect of recently lower written premium generally due to refocusing our sales activity on more desirable risks, which more than off-set the effects of the prior period including a negative $7.0 million adjustment related to return Healthcare premium, as well as higher return ceded premiums under reinsurance policies in the current period of $7.9 million that only benefited the prior year period by $2.9 million, and all of which were fully earned in the respective periods.

Written Premiums

Consolidated net written premiums were $547.0 million in the six months ended June 30, 2017, with an increase of 1.1% from the comparative prior year period driven by increases in twelve of our sixteen operating segments, including Management Liability ($8.7 million), Architects & Engineers ($5.4 million), Surety ($4.8 million), and Technology ($4.6 million) due to strength in both renewals and new business, partially offset by decreases in Programs ($15.9 million), due to exiting two underperforming large accounts, and Entertainment ($12.5 million) due to a refinement of our underwriting appetite.

Underwriting Results

Pre-tax underwriting loss was $5.0 million for the six months ended June 30, 2017, compared to pre-tax underwriting income of $5.6 million for the six months ended June 30, 2016 driven by the factors discussed below.

Our combined ratio for the six months ended June 30, 2017 of 100.9% reflected a 62.9% loss and LAE ratio and a 38.0% expense ratio, which compared to a combined ratio for the six months ended June 30, 2016 of 98.9%, consisting of a 61.5% loss and LAE ratio and a 37.4% expense ratio.

The 1.4 point increase in the loss and LAE ratio was comprised of a 2.0 point increase in current accident year non-catastrophe losses, and a 0.8 point increase in catastrophe losses, partially offset by a 1.4 point decrease in prior accident year losses.

Current accident year non-catastrophe losses for the six months ended June 30, 2017 of $319.8 million, or 59.3 points, compared to $315.3 million, or 57.3 points, for the 2016 period. The increased current accident year non-catastrophe loss ratio was primarily driven by Financial Institutions, which had a large loss, Healthcare, which had increased loss activity in extended care facilities, and continued increased provisions in Programs and Architects & Engineers. These adverse impacts were partially offset by the favorable impacts of Accident & Health, which experienced favorable loss activity.

There was 1.4 points net loss and LAE reserve development on prior accident year reserves, or $7.3 million in the six months ended June 30, 2017, as unfavorable reserve development, primarily in Healthcare due to an adverse settlement on a single managed care errors and omissions claim, and in Programs driven by increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs, with the unfavorable development partially offset by favorable reserve development driven in part by Technology and Accident & Health resulting from favorable loss experience. There was 2.8 points net loss and LAE reserve development on prior accident year reserves in six months ended June 30, 2016, which was driven by Healthcare which recorded $34.8 million of adverse prior year development, which included prior year loss activity recorded in the first quarter of 2016 in the complex risk sub-line, which provides professional liability coverage to hospitals, physicians, and physician groups as well as physicians' extended reporting period coverage. In addition, to a lesser extent, unfavorable development in Programs and a few other businesses, was partially offset by favorable development in Technology, Financial Services and Accident, as well as other businesses.

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Catastrophe losses of $12.1 million, or 2.2 points, in the six months ended June 30, 2017, compared to $7.8 million, or 1.4 points, for the six months ended June 30, 2016, the increase being driven by a large hail storm in Texas impacting Government Risk.

The expense ratio increased 0.6 points to 38.0% for the six months ended June 30, 2017, compared to 37.4% for the six months ended June 30, 2016, driven by higher incentive compensation costs related to the OneBeacon Acquisition.

Investments

Net investment income increased slightly to $26.7 million for the six months ended June 30, 2017, compared to $26.5 million for the six months ended June 30, 2016. Net realized and change in unrealized investment gains of $27.3 million for the six months ended June 30, 2017, compared to $41.3 million for the six months ended June 30, 2016. The decrease was driven by a lower return in our fixed maturity investments portfolio driven by relative interest rate movements in the first six months of 2017 compared to the first six months of 2016. In addition, our other investments portfolio was adversely impacted by the surplus notes, which experienced a negative valuation adjustment during the first six months of 2017 of $1.4 million as opposed to a $11.3 million favorable adjustment in the prior year period. These decreases were partially offset by a higher return in our common equity securities portfolio which benefited from stronger market performance (as measured by the S&P 500 total return index) as compared to the first six months of 2016.

Other Revenues (Expenses)

Other revenues (expenses) increased $3.8 million for the six months ended June 30, 2017 compared to the six months ended June 30, 2016, which was primarily driven by income for the six months ended June 30, 2017 from the excess invested assets remaining after the termination of the OneBeacon qualified pension plan (Qualified Plan).

General and Administrative Expenses

The Company accrued $6.4 million of general and administrative expenses through the six months ended June 30, 2017 in conjunction with the transaction described in Note 2—"OneBeacon Acquisition."

Income Taxes

Our income tax expense (benefit) related to pre-tax income represented a net effective tax rate of 3.5% and (17.5)% for the six months ended June 30, 2017 and 2016, respectively. The effective tax rate for six months ended June 30, 2017 and 2016 were lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income and underwriting income taxed in a jurisdiction with a lower effective tax rate and, for the six months ended June 30, 2016, the impact of a $16.3 million favorable settlement of IRS examinations for the 2007 through 2012 tax years. The effective tax rate on non-U.S. income for the six months ended June 30, 2017 and 2016 was 0.3% and 0.7%, respectively.

Reinsurance Protection

We purchase reinsurance in order to minimize loss from large risks or catastrophic events. We also purchase individual property reinsurance coverage for certain risks to reduce large loss volatility through property-per-risk excess of loss reinsurance programs and individual risk facultative reinsurance. We also maintain excess of loss casualty reinsurance programs that provide protection for individual risk or catastrophe losses involving workers' compensation, general liability, automobile liability, professional liability or umbrella liability. The availability and cost of reinsurance protection is subject to market conditions, which are outside of our control. Limiting our risk of loss through reinsurance arrangements serves to mitigate the impact of large losses; however, the cost of this protection in an individual period may exceed the benefit.

For the six months ended June 30, 2017 and 2016, our net combined ratio was higher than our gross combined ratio by 3.5 points and 4.4 points, respectively, as a result of the cost of the reinsurance programs more than offsetting the benefits from ceded losses. 

Summary of Operations By Segment

Our reportable segments are Specialty Products, Specialty Industries, and Investing, Financing and Corporate.

During the three months ended March 31, 2017, the Company completed its transition to reflect certain management changes and a re-segmenting of various business lines within underwriting operating segments. As part of the transition, the Company's executive management, including the Chief Operating Decision Maker ("CODM"), began receiving a new CODM package which reflected an adjusted aggregation of the underwriting operating segments among the existing underwriting reportable segments. The new underwriting operating segments are also consistent with how we began externally branding the related insurance products during the three months ended March 31, 2017. The following represents a summary of the changes made:

Media liability: The media liability line, which was previously included in the Other Professional Lines underwriting operating segment within Specialty Products, was moved into the Entertainment underwriting operating segment within Specialty Industries.

Medical excess: The medical excess line, which was previously included in the Healthcare underwriting operating segment within Specialty Products, was moved into the Accident underwriting operating segment which, in turn, has been renamed "Accident and Health" within Specialty Industries.

Architects and Engineers:The Architects and Engineers line, which was previously included in the Other Professional Lines underwriting operating segment within Specialty Products, has been separately broken out such that it is now a separate underwriting operating segment.

Other Professional Lines:The Other Professional Lines former underwriting operating segment is no longer considered an underwriting operating segment.

Prior periods have been restated to conform to current presentation of segment information. Other than these changes, there have been no material changes to the Company's determination of reportable segments from that reported in the 2016 Annual Report on Form 10-K.

The Specialty Products segment is comprised of ten active underwriting operating segments, representing an aggregation based on those that offer distinct products and tailored coverages and services to a broad customer base across the United States. Specialty Products includes the Healthcare, Management Liability, Financial Services, Architects and Engineers, Specialty Property, Environmental, Tuition Reimbursement, Programs, Surety and Financial Institutions underwriting operating segments.

The Specialty Industries segment is comprised of six active underwriting operating segments, representing an aggregation based on those that focus on solving the unique needs of a particular customer or industry group. The Specialty Industries segment includes the Ocean Marine, Inland Marine, Technology, Accident & Health, Government Risks and Entertainment underwriting operating segments.

The Investing, Financing and Corporate segment includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through the Company and our intermediate holding company subsidiaries.

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Specialty Products

Financial results for our Specialty Products reportable segment for the three and six months ended June 30, 2017 and 2016 were as follows:

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Gross written premiums	$	150.2		$	120.6		$	285.1		$	258.4
Net written premiums	$	126.8		$	105.0		$	231.9		$	223.4
Earned premiums	$	130.4		$	123.1		$	249.6		$	246.3
Loss and LAE	(98.6		)	(99.4		)	(181.5		)	(185.8		)
Policy acquisition expenses	(22.0		)	(21.6		)	(41.6		)	(44.8		)
Other underwriting expenses	(24.8		)	(22.3		)	(45.5		)	(43.6		)
Total underwriting loss	(15.0		)	(20.2		)	(19.0		)	(27.9		)
Net other expenses	—			—			(0.1		)	(0.1		)
Pre-tax loss	$	(15.0	)	$	(20.2	)	$	(19.1	)	$	(28.0	)

The following table provides underwriting ratios for Specialty Products for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Underwriting ratios:
Loss and LAE	75.6	%	80.8	%	72.7	%	75.5	%
Expense	35.8		35.6		34.9		35.9
Total combined ratio	111.4	%	116.4	%	107.6	%	111.4	%

The impact of certain items to our underwriting ratios was as follows:

	Three months ended June 30,		Six months ended June 30,
(Favorable) unfavorable impact	2017	2016	2017	2016
Point impact on loss and LAE ratio and combined ratio:
Catastrophe losses, net of reinsurance	0.5 pts	1.3 pts	0.4 pts	0.9 pts
Prior year loss reserve development	6.9 pts	19.5 pts	7.8 pts	15.8 pts

Specialty Products—Three months ended June 30, 2017 versus three months ended June 30, 2016

Net written premiums for Specialty Products increased to $126.8 million for the second quarter of 2017 from $105.0 million for the comparative 2016 period, primarily due to increases at our Surety ($6.1 million) and Management Liability ($5.2 million) businesses, as well as smaller increases at most other businesses driven generally by stronger renewals and new business.

The Specialty Products combined ratio for the second quarter of 2017 decreased to 111.4% from 116.4% for the second quarter of 2016, as the loss and LAE ratio decreased by 5.2 points to 75.6%, and the expense ratio increased by 0.2 points to 35.8%.

The 5.2 point decrease to the loss and LAE ratio in the second quarter of 2017 compared to the 2016 period was comprised of a 8.2 point increase in current accident year non-catastrophe losses that was more than offset by a 12.6 point favorable change in net prior year loss reserve development and a 0.8 point decrease in catastrophe losses.

The current accident year non-catastrophe loss ratio for the second quarter of 2017 was 68.2%, compared to 60.0% for the second quarter of 2016, with the increase driven by increased losses in our Financial Institutions, driven by one large loss, Healthcare, which had increased loss activity in extended care facilities, and Programs, driven by continued adverse results across accounts. As a result of continued under-performance in our Programs business, we are considering strategic alternatives for that business.

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The second quarter of 2017 results included 6.9 points of net unfavorable prior accident year loss reserve development, primarily due to unfavorable development in Programs, due to increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs. This compared with 19.5 points of net unfavorable prior year loss reserve development in the second quarter of 2016, primarily related to unfavorable loss reserve development driven by large claims and heavy loss activity in Healthcare, and to a lesser extent, Programs, related to two larger programs that we have exited, and Architects & Engineers, which was partially offset by favorable development in Financial Services.

The second quarter of 2017 included 0.5 points of catastrophe losses which compared to 1.3 points in the second quarter of 2016, with Financial Services in the prior year being adversely affected by wind and thunderstorms in the midwest and on the east coast of the United States.

The 0.2 point slight increase in the expense ratio for the second quarter of 2017, compared to the second quarter of 2016, was driven by incentive compensation expenses related to the OneBeacon Acquisition, which were partially offset by lower insurance acquisition expenses.

Specialty Products—Six months ended June 30, 2017 versus six months ended June 30, 2016

Net written premiums for Specialty Products increased to $231.9 million for the six months ended June 30, 2017 from $223.4 million for the comparative 2016 period, primarily due to increases at our Management Liability ($8.7 million), Architects & Engineers ($5.4 million), and Surety ($4.8 million) businesses as well as smaller increases at most other businesses. These increases were partially offset by a large decrease at our Programs business ($15.9 million), as we have exited two large accounts as a result of poor underwriting results, and to a lesser extent a decrease at our Healthcare business due to refocusing our sales activity on more desirable risks.

The Specialty Products combined ratio for the six months ended June 30, 2017 decreased to 107.6% from 111.4% for the six months ended June 30, 2016, as the loss and LAE ratio decreased by 2.8 points to 72.7%, and the expense ratio decreased by 1.0 points to 34.9%.

The 2.8 point decrease to the loss and LAE ratio in the six months ended June 30, 2017 compared to the 2016 period was comprised of a 5.7 point increase in current accident year non-catastrophe losses that was more than offset by a 8.0 point favorable change in net prior year loss reserve development and a 0.5 point decrease in catastrophe losses.

The current accident year non-catastrophe loss ratio for the six months ended June 30, 2017 was 64.5%, compared to 58.8% for the six months ended June 30, 2016, with the increase driven by increased losses in Financial Institutions and Healthcare, which had increased loss activity in extended care facilities.

The results for the six months ended June 30, 2017 included 7.8 points of net unfavorable prior accident year loss reserve development, primarily in Healthcare due to an adverse settlement on a single managed care errors and omissions claim and other claim activity, and in Programs driven by increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs,which was modestly offset by favorable development elsewhere. This compared with 15.8 points of net unfavorable prior year loss reserve development in the six months ended June 30, 2016, primarily related to unfavorable loss reserve development driven by large claims and heavy loss activity in Healthcare, and to a lesser extent Architects & Engineers and Programs, which was partially offset by favorable development in Financial Services.

The six months ended June 30, 2017 included 0.4 points of catastrophe losses which compared to 0.9 points of catastrophe losses for the six months ended June 30, 2016 related to wind and thunderstorms in Texas impacting Financial Services.

The 1.0 point decrease in the expense ratio for the six months ended June 30, 2017, compared to the six months ended June 30, 2016, was as a result of ceding commissions related to our Financial Institutions business and fronting of other business, which were partially offset by incentive compensation expenses related to the OneBeacon Acquisition.

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Specialty Industries

Financial results for our Specialty Industries reportable segment for the three and six months ended June 30, 2017 and 2016 were as follows:

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Gross written premiums	$	172.7		$	165.4		$	335.1		$	338.1
Net written premiums	$	163.3		$	156.0		$	315.1		$	317.7
Earned premiums	$	147.0		$	148.3		$	289.6		$	303.7
Loss and LAE	(90.0		)	(80.3		)	(157.7		)	(152.7		)
Policy acquisition expenses	(26.4		)	(27.1		)	(52.1		)	(54.9		)
Other underwriting expenses	(34.8		)	(28.6		)	(65.8		)	(62.6		)
Total underwriting income (loss)	(4.2		)	12.3			14.0			33.5
Net other revenues	0.2			0.2			0.4			0.5
General and administrative expenses	(0.5		)	(0.5		)	(1.0		)	(1.0		)
Pre-tax income	$	(4.5	)	$	12.0		$	13.4		$	33.0

The following table provides underwriting ratios for Specialty Industries for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Underwriting ratios:
Loss and LAE	61.2	%	54.3	%	54.5	%	50.2	%
Expense	41.6		37.5		40.7		38.7
Total combined ratio	102.8	%	91.8	%	95.2	%	88.9	%

The impact of certain items to our underwriting ratios was as follows:

	Three months ended June 30,		Six months ended June 30,
(Favorable) unfavorable impact	2017	2016	2017	2016
Point impact on loss and LAE ratio and combined ratio:
Catastrophe losses, net of reinsurance	6.7 pts	2.5 pts	3.8 pts	1.9 pts
Prior year loss reserve development	(1.1) pts	(5.8) pts	(4.2) pts	(7.8) pts

Specialty Industries—Three months ended June 30, 2017 versus three months ended June 30, 2016

Net written premiums for Specialty Industries increased to $163.3 million for the second quarter of 2017 from $156.0 million for the comparative 2016 period. The increase in the second quarter of 2017 was driven by increases at our Accident & Health ($3.7 million) and Technology ($2.9 million) businesses partially offset by a decrease at our Entertainment ($2.9 million) business.

The Specialty Industries combined ratio for the second quarter of 2017 increased to 102.8%, compared to 91.8% for the second quarter of 2016, as the loss and LAE ratio increased by 6.9 points to 61.2%, and the expense ratio increased by 4.1 points to 41.6%.

The 6.9 point increase to the loss and LAE ratio was comprised of a 2.0 point decrease in current accident year non-catastrophe losses, a 4.7 point decrease in favorable prior year loss reserve development and a 4.2 point increase in catastrophe losses.

The current accident year non-catastrophe loss ratio for the second quarter of 2017 was 55.6%, compared to 57.6% for the second quarter of 2016, with the decrease driven by the performance of our Accident & Health business, with the Medical Excess sub-line improving relative to the prior year period, partially offset by higher current accident year non-catastrophe losses in our Ocean Marine and Entertainment businesses.

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Results for the second quarter of 2017 included 1.1 points of net favorable prior accident year loss reserve development driven by Technology, Ocean Marine, and Accident & Health, resulting generally from better than expected case incurred activity, which was partially offset by unfavorable development in Government Risks and Entertainment, due to a large claim settlement. This compared to 5.8 points of net favorable prior accident year loss reserve development in the second quarter of 2016.

Results for the second quarter of 2017 included 6.7 points of catastrophe losses, resulting substantially from claims related to a hail storm within our Government Risks business, as well as modest activity impacting several other businesses. This compared to 2.5 points of catastrophe losses in the second quarter of 2016.

The 4.1 point increase in the expense ratio for the second quarter of 2017, compared to the second quarter of 2016, was driven by incentive compensation expenses related to the OneBeacon Acquisition.

Specialty Industries—Six months ended June 30, 2017 versus six months ended June 30, 2016

Net written premiums for Specialty Industries decreased to $315.1 million for the six months ended June 30, 2017 from $317.7 million for the comparative 2016 period. The decrease in the six months ended June 30, 2017 was driven by a $12.5 million decrease at our Entertainment business due to a refinement of our underwriting appetite and was offset by modest increases at most other business units, most notably, Technology ($4.6 million).

The Specialty Industries combined ratio for the six months ended June 30, 2017 increased to 95.2%, compared to 88.9% for the six months ended June 30, 2016, as the loss and LAE ratio increased by 4.3 points to 54.5%, and the expense ratio increased by 2.0 points to 40.7%.

The 4.3 point increase to the loss and LAE ratio was comprised of a 1.2 point decrease in current accident year non-catastrophe losses, a 3.6 point unfavorable change in prior year loss reserve development and a 1.9 point increase in catastrophe losses due to a large claim.

The current accident year non-catastrophe loss ratio for the six months ended June 30, 2017 was 54.9%, compared to 56.1% for the six months ended June 30, 2016, driven by the performance of our Accident & Health business, partially offset by higher current accident year non-catastrophe losses primarily in Government Risks, driven by the auto and professional and excess liability lines.

Results for the six months ended June 30, 2017 included 4.2 points of net favorable prior accident year loss reserve development driven by Technology, Accident & Health, and Ocean Marine resulting from better than expected case incurred activity, which was partially offset by unfavorable development in Government Risks, driven by the auto and professional and excess liability lines, and Inland Marine, due to several large claims. This compared to 7.8 points of net favorable prior accident year loss reserve development in the six months ended June 30, 2016.

Results for the six months ended June 30, 2017 included 3.8 points of catastrophe losses, resulting substantially from claims related to a large hail storm in Texas within our Government Risks business, as well as modest activity impacting several other businesses. This compared to 1.9 points of catastrophe losses in the six months ended June 30, 2016.

The 2.0 point increase in the expense ratio for the six months ended June 30, 2017, compared to the six months ended June 30, 2016, was driven by incentive compensation expenses related to the OneBeacon Acquisition, which were partially offset by lower insurance acquisition expenses.

Investing, Financing and Corporate

A summary of results from our Investing, Financing and Corporate reportable segment for the three and six months ended June 30, 2017 and 2016 is as follows:

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Net investment income	$	14.5		$	12.1		$	26.7		$	26.5
Net realized and change in unrealized investment gains	12.3			24.7			27.3			41.3
Pre-tax investment results	26.8			36.8			54.0			67.8
Net other revenues	1.9			0.6			5.2			1.3
General and administrative expenses	(8.3		)	(3.0		)	(12.8		)	(6.4		)
Interest expense	(3.3		)	(3.2		)	(6.6		)	(6.5		)
Pre-tax income	$	17.1		$	31.2		$	39.8		$	56.2

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Investing, Financing and Corporate—Three months ended June 30, 2017 versus three months ended June 30, 2016

Investing, Financing and Corporate reported pre-tax income of $17.1 million in the second quarter of 2017, compared to $31.2 million in the second quarter of 2016. The decrease was driven by lower pre-tax investment results due to lower positive valuation adjustments on the surplus notes of $0.9 million compared to $11.0 million in the 2016 period, as well as lower returns in the fixed maturity investments portfolio, but was partially offset by higher returns in the common equity securities portfolio. In addition, general and administrative expenses increased from $3.0 million to $8.3 million as a result of expenses related to the OneBeacon Acquisition. These decreases were partially offset by a $1.3 million increase in net other revenues compared to the second quarter of 2016 resulting from income from the excess invested assets that previously supported the Qualified Plan.

Investing, Financing and Corporate—Six months ended June 30, 2017 versus six months ended June 30, 2016

Investing, Financing and Corporate reported pre-tax income of $39.8 million in six months ended June 30, 2017, compared to $56.2 million in the six months ended June 30, 2016. The decrease was driven by lower pre-tax investment results due to a negative valuation adjustment on the surplus notes of $1.4 million compared to a positive valuation adjustment of $13.7 million in the 2016 period, as well as lower returns in the fixed maturity investments portfolio but was partially offset by higher returns in the common equity securities portfolio. In addition, general and administrative expenses increased from $6.4 million to $12.8 million as a result of expenses related to the OneBeacon Acquisition. These decreases were partially offset by a $3.9 million increase in net other revenues compared to the six months ended June 30, 2016 resulting from income from the excess invested assets that previously supported the Qualified Plan, the majority of which are now held in the Qualified Replacement Plan.

Summary of Investment Results

OneBeacon invests to maximize long-term total returns (after-tax) while taking prudent levels of risk and maintaining a diversified portfolio, subject to investment guidelines and regulatory restrictions. Investments include fixed maturity investments, short-term investments, common equity securities and other investments.

During the third quarter of 2016, OneBeacon established a portfolio of high-yield fixed maturity investments. Given the risk profile of these investments, OneBeacon's management believes that the returns associated with the high-yield fixed maturity investments are more appropriately included with the returns from common equity securities and other investments instead of with returns associated with short-term investments and investment grade fixed maturity investments. See "INVESTMENT RETURNNON-GAAP FINANCIAL MEASURE" on page 61.    

Investment Returns

OneBeacon's investment return percentages are presented gross of management fees and trading expenses in order to produce a better comparison to benchmark returns, while all dollar amounts are presented net of management fees and trading expenses. A summary of our consolidated pre-tax investment results for the three and six months ended June 30, 2017 and 2016 is as follows:

Components of Investment Results	Three months ended June 30,				Six months ended June 30,
($ in millions)	2017		2016		2017		2016
Net investment income	$	14.5	$	12.1	$	26.7	$	26.5
Net realized investment gains (losses)	0.5		1.1		0.9		(4.8		)
Change in net unrealized investment gains	11.8		23.6		26.4		46.1
Total pre-tax investment results	$	26.8	$	36.8	$	54.0	$	67.8

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Gross investment returns on average invested assets versus typical benchmarks for the three and six months ended June 30, 2017 and 2016 are as follows:

	Three months ended June 30,(1)				Six months ended June 30,(1)
	2017		2016		2017		2016
Short-term investments	0.1	%	0.1	%	0.2	%	0.1	%
Investment grade fixed maturity investments	0.9	%	1.2	%	1.7	%	2.4	%
High-yield fixed maturity investments	3.1	%	N/A		5.4	%	N/A
Total fixed income investments	0.9	%	1.1	%	1.8	%	2.3	%
Total fixed income investments, excluding high-yield fixed maturity investments	0.8	%	N/A		1.6	%	N/A
Bloomberg Barclays U.S. Intermediate Aggregate Index	0.9	%	1.4	%	1.6	%	3.8	%
Common equity securities	3.4	%	(0.5	)%	9.1	%	1.8	%
Other investments	(0.5	)%	10.2	%	(1.7	)%	10.5	%
Total common equity securities and other investments	1.8	%	3.3	%	4.6	%	4.8	%
Total common equity securities, other investments and high-yield fixed maturity investments	2.1	%	N/A		4.8	%	N/A
S&P 500 Index	3.1	%	2.5	%	9.3	%	3.8	%
Total consolidated portfolio	1.1	%	1.5	%	2.1	%	2.7	%

_______________________________________________________________________________

⁽¹⁾  Gross investment returns exclude investment expenses of $1.0 million and $1.1 million for the three months ended June 30, 2017 and 2016, respectively, and $2.3 million and $2.4 million for the six months ended June 30, 2017 and 2016, respectively.

Investment Returns—Three months ended June 30, 2017 versus three months ended June 30, 2016

Overview

Our total pre-tax investment results were $26.8 million, a return on average invested assets of 1.1%, for the three months ended June 30, 2017, compared to $36.8 million, a return on average invested assets of 1.5%, for the three months ended June 30, 2016. The decrease was driven primarily by a lower return on our other invested asset portfolio, which was positively impacted by an $11.0 million favorable valuation adjustment on the surplus notes in the 2016 period. Partially offsetting the decrease was a higher return on our common equity portfolio, which benefited from stronger market performance (as measured by the S&P 500 total return index) as compared to 2016 as well as improved relative performance in the 2017 period.

Fixed income

We maintain a high quality fixed income portfolio with a relatively short duration of approximately 2.6 years excluding short-term investments and approximately 2.5 years including short-term investments as of June 30, 2017. Our fixed income portfolio returned 0.9% for the three months ended June 30, 2017, in line with the longer duration, but higher credit quality Bloomberg Barclays U.S. Intermediate Aggregate Index return of 0.9%. That compares to a 1.1% return on our fixed income portfolio for the three months ended June 30, 2016, underperforming the Bloomberg Barclays U.S. Intermediate Aggregate Index return of 1.4% for that period.

Excluding high-yield fixed maturity investments, our fixed income portfolio returned 0.8% for the three months ended June 30, 2017, underperforming the longer duration Bloomberg Barclays U.S. Intermediate Aggregate Index return of 0.9%.

Common equity securities and other investments

OneBeacon maintains a portfolio of common equity securities and other investments, including surplus notes, hedge funds and private equity funds. We believe that prudent levels of these investments are likely to enhance long-term after-tax total returns. Our portfolio of common equity securities and other investments represented approximately 12.6% and 12.9% of total invested assets as of June 30, 2017 and December 31, 2016, respectively. Including high-yield fixed maturity investments OneBeacon’s portfolio of common equity securities, other investments and high-yield fixed maturity investments represented approximately 16.5% and 16.4% of total invested assets as of June 30, 2017 and December 31, 2016, respectively.

Our common equity securities portfolio returned 3.4% for the three months ended June 30, 2017, outperforming the S&P 500 Index return of 3.1%, compared to (0.5)% for the three months ended June 30, 2016, underperforming the S&P 500 Index

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return of 2.5%. Both variances to the S&P 500 Index return can be attributed largely to the results of our actively-managed publicly traded common equity securities portfolio.

Our other investments portfolio returned (0.5)% for the three months ended June 30, 2017, underperforming the S&P 500 Index return of 3.1%, compared to 10.2% for the three months ended June 30, 2016, significantly outperforming the S&P 500 Index return of 2.5%. The variance for the three months ended June 30, 2017 is partially attributable to a negative $2.3 million valuation adjustment to our currency forward position, which was adversely impacted by the strengthening of the British Pound Sterling relative to the United States Dollar.

Our common equity securities and other investments portfolio returned 1.8% for the three months ended June 30, 2017, underperforming the S&P 500 Index return of 3.1%, compared to 3.3% for the three months ended March 31, 2016, outperforming the S&P 500 Index return of 2.5%.

The portfolio of common equity securities, other investments and high-yield fixed maturity investments returned 2.1% for the three months ended June 30, 2017, underperforming the S&P 500 Index return of 3.1%.

OneBeacon invests in ETFs that seek to provide investment results that, before expenses, generally correspond to the performance of broad market indices. The ETF investments earned the effective market return, before expenses.

The following summarizes OneBeacon's investments in ETFs by exposure to each index:

	Fair Value ($ in millions)
Index	June 30, 2017		December 31, 2016
S&P 500	$	177.9	$	164.4

We, through White Mountains Advisors LLC (WM Advisors), a registered investment advisor and wholly owned subsidiary of White Mountains, have established a relationship with an unrelated third party registered investment adviser, Lateef Investment Management (Lateef), to actively manage a portion of our common equity securities portfolio. The Lateef common equity portfolio had fair values of $27.6 million and $24.3 million as of June 30, 2017 and December 31, 2016, respectively.

During the third quarter of 2016, we established a portfolio of high-yield fixed maturity investments. The high-yield portfolio had fair values of $102.4 million and $91.0 million as of June 30, 2017 and December 31, 2016, respectively.

Investment Returns—Six months ended June 30, 2017 versus six months ended June 30, 2016

Overview

Our total pre-tax investment results were $54.0 million, a return on average invested assets of 2.1%, for the six months ended June 30, 2017, compared to $67.8 million, a return on average invested assets of 2.7%, for the six months ended June 30, 2016. The decrease was driven primarily by a lower return on our other invested asset portfolio, which was positively impacted by an $11.3 million favorable valuation adjustment on the surplus notes in the 2016 period, as well as a lower return on our fixed income portfolio, which was positively impacted by declining interest rates in the 2016 period. Partially offsetting the decrease was a higher return on our common equity portfolio, which benefited from stronger market performance (as measured by the S&P 500 total return index) as compare to 2016 as well as improved relative performance in the 2017 period.

Fixed income

We maintain a high quality fixed income portfolio with a relatively short duration of approximately 2.6 years excluding short-term investments and approximately 2.5 years including short-term investments as of June 30, 2017. Our fixed income portfolio returned 1.8% for the six months ended June 30, 2017, outperforming the longer duration, but higher credit quality Bloomberg Barclays U.S. Intermediate Aggregate Index return of 1.6%. That compares to a 2.3% return on our fixed income portfolio for the six months ended June 30, 2016, underperforming the Bloomberg Barclays U.S. Intermediate Aggregate Index return of 3.8% for that period.

Excluding high-yield fixed maturity investments, our fixed income portfolio returned 1.6% for the six months ended June 30, 2017, in-line with the longer duration Bloomberg Barclays U.S. Intermediate Aggregate Index return of 1.6%.

Common equity securities and other investments

Our common equity securities portfolio returned 9.1% for the six months ended June 30, 2017, largely in-line with the S&P 500 Index return of 9.3%, compared to 1.8% for the six months ended June 30, 2016, underperforming the S&P 500 Index return of 3.8%. Both variances to the S&P 500 Index return can be attributed largely to the results of our actively-managed publicly traded common equity securities portfolio.

Our other investments portfolio returned (1.7)% for the six months ended June 30, 2017, significantly underperforming the S&P 500 Index return of 9.3%, compared to 10.5% for the six months ended June 30, 2016, significantly outperforming the S&P 500 Index return of 3.8%. The variance for the six months ended June 30, 2017 is partially attributable to a negative $2.3

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million valuation adjustment to our currency forward position, which was adversely impacted by the strengthening of the British Pound Sterling relative to the United States Dollar as well as a negative $1.4 million valuation adjustment to the surplus notes, reflecting an increase in the assumed liquidity spread from 250 basis points to 400 basis points, partially offset by the impact of narrowing of non-investment grade credit spreads. The change in estimated liquidity spread reflects management’s increasing view that the surplus notes would be difficult to sell.

Our common equity securities and other investments portfolio returned 4.6% for the six months ended June 30, 2017, underperforming the S&P 500 Index return of 9.3%, compared to 4.8% for the six months ended June 30, 2016, outperforming the S&P 500 Index return of 3.8%.

The portfolio of common equity securities, other investments and high-yield fixed maturity investments returned 4.8% for the six months ended June 30, 2017, underperforming the S&P 500 Index return of 9.3%.

INVESTMENT RETURNNON-GAAP FINANCIAL MEASURE

In the third quarter of 2016, OneBeacon purchased high-yield fixed maturity investments, which are U.S. dollar denominated publicly traded and 144A debt securities issued by corporations with generally at least one rating between "B-" and "BB+" inclusive by Standard and Poor's or similar ratings from other agencies. Given the risk profile of these investments, OneBeacon has included returns on high-yield fixed maturity investment returns with returns on common equity securities and other investments. A reconciliation of these returns follows:

	Three Months Ended June 30, 2017
	GAAP return		Include: Impact of return on high yield fixed maturity investments(1)		Reported return
Common equity securities and other investment returns	1.8	%	0.3	%	2.1	%

	Six Months Ended June 30, 2017
	GAAP return		Include: Impact of return on high yield fixed maturity investments(1)		Reported return
Common equity securities and other investment returns	4.6	%	0.2	%	4.8	%

_______________________________________________________________________________

⁽¹⁾ High-yield fixed maturity investments returned 3.1% and 5.4% for the three and six months ended June 30, 2017, respectively.

Liquidity and Capital Resources

Operating Cash and Short-term Investments

Our sources and uses of cash are as follows:

Holding company level. The primary sources of cash for OneBeacon Insurance Group, Ltd. (OneBeacon Ltd.) and certain of our intermediate subsidiaries are expected to be distributions and tax sharing payments received from our insurance operating subsidiaries, capital raising activities, net investment income, and proceeds from sales and maturities of holding company investments. The primary uses of cash are expected to be interest payments on our debt obligations, repurchases and retirements of our debt obligations, dividend payments on our common shares, common share repurchases, purchases of investments, payments made to tax authorities, contributions to our operating subsidiaries, and holding company operating expenses.

Operating subsidiary level. The primary sources of cash for our operating subsidiaries are expected to be premium collections, net investment income, capital raising activities, contributions from our holding companies, and proceeds from sales and maturities of investments. The primary uses of cash are expected to be claim payments, policy acquisition and other underwriting expenses, interest payments on internal debt obligations, repurchases and retirements of internal debt obligations, purchases of investments, and distributions and tax sharing payments made to parent holding companies.

Insurance companies typically collect premiums on policies that they write prior to paying claims made under those policies. During periods of premium growth, insurance companies typically experience positive cash flow from operations, as premium receipts typically exceed claim payments and other operating expenses. When this happens, positive cash flow from operations is usually offset by negative cash flow from investing activities, as the positive operating cash flow is used to purchase investments. Conversely, during periods of premium decline, insurance companies typically experience negative cash flow from operations, even during periods in which they report net income, as the claims and other operating expenses that they

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pay exceed the premiums that they collect. When this happens, negative cash flow from operations is typically offset by positive cash flow from investing activities, as invested assets are sold to fund current claim payments.

Both internal and external forces influence our financial position, results of operations and cash flows. Claim settlements, premium levels and investment returns may be impacted by changing rates of inflation and other economic conditions. In many cases, significant periods of time, sometimes several years or more, may lapse between the occurrence of an insured loss, the reporting of the loss to us and the settlement of the liability for that loss. The exact timing of the payment of claims and benefitscannot be predicted with certainty. Our operating subsidiaries maintain portfolios of invested assets with varying maturities and a substantial amount of cash and short-term investments to provide adequate liquidity for the payment of claims.

Management believes that our cash balances, cash flows from operations and cash flows from investments are adequate to meet expected cash requirements for the foreseeable future on both a holding company and operating subsidiary level.

Dividend Capacity

Under the insurance laws of the states and jurisdictions under which our insurance operating subsidiaries are domiciled, an insurer is restricted with respect to the timing and the amount of dividends it may pay without prior approval by regulatory authorities. Accordingly, there can be no assurance regarding the amount of such dividends that may be paid by such subsidiaries in the future.

Our top tier regulated U.S. insurance operating subsidiary, Atlantic Specialty Insurance Company (ASIC), has the ability to pay dividends to its immediate parent without the prior approval of regulatory authorities in an amount set by formula based on the lesser of (i) adjusted net investment income, as defined by statute, or (ii) 10% of statutory surplus, in both cases as most recently reported to regulatory authorities, subject to availability of earned surplus. During the six months ended June 30, 2017, ASIC paid $30.0 million of dividend to its immediate parent which took into consideration the rolling 12 month portion of this statutorily defined calculation, including adjusted net investment income and the timing of dividends paid. As of March 31, 2017, ASIC had $624.8 million of statutory surplus and $69.0 million of earned surplus.

In 2017, Split Rock Insurance, Ltd. ("Split Rock") has the ability to distribute statutory capital without the prior approval of the Bermuda Monetary Authority, provided it does not reduce its total statutory capital, as shown in its previous financial year’s statutory financial statements, by 15% or more. In addition, Split Rock has the ability to pay dividends without the prior notification of regulatory authorities of up to 25% of its previous financial year's total statutory capital and surplus, subject to meeting all appropriate liquidity and solvency requirements as specified in the Insurance Act and the Companies Act. As of December 31, 2016, Split Rock had $210.1 million of total statutory capital and $60.1 million of surplus for total statutory capital and surplus of $270.2 million.

Based upon the limitations described above, Split Rock currently has the ability to distribute up to $31.5 million of statutory capital and pay up to $60.1 million of dividends during 2017 without the prior approval of regulatory authorities. During the six months ended June 30, 2017 and 2016, Split Rock did not pay any dividends or distributions to its immediate parent.

During the six months ended June 30, 2017 and 2016, our unregulated insurance operating subsidiaries paid $4.8 millionand $4.7 million, respectively, of dividends to their immediate parent. As of June 30, 2017, our unregulated insurance operating subsidiaries had $57.5 million of net unrestricted cash, short-term investments, and fixed maturity investments and $70.5 million of other investments consisting of the surplus notes.

As described in Note 13—"Common Shareholders' Equity" to the accompanying consolidated financial statements, during the six months ended June 30, 2017 and 2016, we declared and paid dividends totaling $39.8 million and $39.6 million, respectively, to our common shareholders.

As of June 30, 2017, the Company and its intermediate holding company subsidiaries held $50.5 million of net unrestricted cash, short-term investments and fixed maturity investments and $12.8 million of common equity securities outside of its regulated and unregulated insurance operating subsidiaries.

Ratings

Insurance companies are evaluated by various rating agencies in order to measure each company's financial strength. Higher ratings generally indicate financial stability and a stronger ability to pay claims. We believe that strong ratings are an important factor in the marketing of insurance products and services to distribution partners and customers. These claims-paying (or financial strength) ratings do not refer to our ability to meet non-insurance obligations and are not a recommendation to purchase or discontinue any policy or contract issued by us or to buy, hold, or sell our securities.

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The following table presents the financial strength ratings assigned to our principal insurance operating subsidiaries as of August 4, 2017:

	A.M. Best(1)	Fitch(2)	Moody's(3)	Standard & Poor's(4)
Ratings	"A" (Excellent)	"A" (Strong)	"A3" (Good)	"A-" (Strong)
Outlook	Under Review	Positive Watch	Under Review	Developing

_______________________________________________________________________________

⁽¹⁾  "A" is the third highest of sixteen financial strength ratings assigned by A.M. Best.

⁽²⁾  "A" is the sixth highest of nineteen international financial strength ratings assigned by Fitch.

⁽³⁾  "A3" is the seventh highest of twenty-one financial strength ratings assigned by Moody's.

⁽⁴⁾  "A-" is the seventh highest of twenty-one financial strength ratings assigned by Standard & Poor's.

Subsequent to the announcement of the OneBeacon Acquisition, the rating agencies listed above revised their Outlook. On May 2, 2017, Fitch placed the rating on "Positive Watch." On May 3, 2017, Moody's placed the rating on "review for upgrade." On May 2, 2017, Standard & Poor's revised the rating outlook to "Developing" from "Stable." On May 3, 2017, A.M. Best placed the rating on "under review with positive implications."

Insurance Float

Insurance float is an important aspect of our insurance operations. Insurance float represents funds that an insurance company holds for a limited time. In an insurance operation, float arises because premiums are collected before losses are paid. This interval can extend over many years. During that time, the insurer invests the funds. When the premiums that an insurer collects do not cover the losses and expenses it eventually must pay, the result is an underwriting loss, which can be considered as the cost of insurance float. One manner in which we calculate our insurance float is by taking our insurance liabilities and subtracting insurance assets. Although insurance float can be calculated using numbers determined under GAAP, insurance float is not a GAAP concept and, therefore, there is no comparable GAAP measure.

Insurance float can increase in a number of ways, including through acquisitions of insurance operations, organic growth in existing insurance operations and recognition of losses that do not immediately cause a corresponding reduction in investment assets. Conversely, insurance float can decrease in a number of other ways, including sales of insurance operations, shrinking or run-off of existing insurance operations, the acquisition of operations that do not have substantial investment assets (e.g., an agency) and the recognition of gains that do not cause a corresponding increase in investment assets. We intend to generate low-cost float over time through a combination of organic growth and acquisitions.

Certain operational leverage metrics can be measured with ratios that are calculated using insurance float. There are many activities that do not change the amount of insurance float at an insurance company but can have a significant impact on the company's operational leverage metrics. For example, investment gains and losses, debt issuances and repurchases/repayments, common share issuances and repurchases and dividends paid to shareholders are all activities that do not change insurance float but that can meaningfully impact operational leverage metrics that are calculated using insurance float.

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The following table illustrates our consolidated insurance float position and two operational leverage ratios based on insurance float as of June 30, 2017 and December 31, 2016:

($ in millions)	June 30, 2017			December 31, 2016
Loss and LAE reserves	$	1,411.2		$	1,365.6
Unearned premiums	595.2			575.1
Reinsurance balances payable	7.1			17.0
Funds held under insurance contracts	210.2			153.0
Insurance liabilities	$	2,223.7		$	2,110.7
Cash in regulated insurance and reinsurance subsidiaries	$	14.5		$	13.6
Reinsurance recoverable on paid and unpaid losses	198.0			179.5
Premiums receivable	245.4			228.3
Deferred acquisition costs	106.9			96.3
Ceded unearned premiums	56.6			44.2
Insurance assets	$	621.4		$	561.9
Insurance float	$	1,602.3		$	1,548.8
Insurance float as a multiple of total capital	1.2		x	1.2		x
Insurance float as a multiple of OneBeacon's common shareholders' equity	1.6		x	1.5		x

During the six months ended June 30, 2017, insurance float increased by $53.5 million, primarily due to an increase in funds held under insurance contracts as a result of additional collateral received related to our Surety business.

Financing and Capital Items

Debt

The following table summarizes our debt to capital ratio at June 30, 2017 and December 31, 2016:

($ in millions)	June 30, 2017			December 31, 2016
Senior Notes, carrying value	$	273.3		$	273.2
Non-controlling interest	(0.3		)	3.9
OneBeacon's common shareholders' equity	1,015.1			1,021.3
Total capital	$	1,288.1		$	1,298.4
Ratio of debt to total capital	21.2		%	21.0		%

We believe that we have the flexibility and capacity to obtain funds externally as needed through debt or equity financing on both a short-term and long-term basis. However, we can provide no assurance that, if needed, we would be able to obtain additional debt or equity financing on satisfactory terms, if at all.

On September 29, 2015, the Company and OneBeacon Holdings, Inc. (OBH), as co-borrowers and co-guarantors, entered into a revolving credit facility administered by U.S. Bank N.A. (U.S. Bank) and including BMO Harris Bank N.A. as an additional lender, which has a total commitment of $65.0 million and has a maturity date of September 29, 2019 (Credit Facility). As of June 30, 2017, the Credit Facility was undrawn.

The Credit Facility contains various affirmative, negative and financial covenants which OneBeacon considers to be customary for such borrowings, including certain minimum net worth and maximum debt to capitalization standards. These covenants can restrict the Company, OBH and their respective subsidiaries in several ways, including their ability to incur additional indebtedness. An uncured breach of these covenants could result in an event of default under the Credit Facility, which would allow lenders to declare any amounts owed under the Credit Facility to be immediately due and payable.

In November 2012, OBH issued $275.0 million face value of senior unsecured notes (2012 Senior Notes) through a public offering, at an issue price of 99.9% and received $272.9 million of proceeds. The 2012 Senior Notes bear an annual interest rate of 4.6% payable semi-annually in arrears on May 9 and November 9, until maturity on November 9, 2022, and are fully and unconditionally guaranteed as to the payment of principal and interest by the Company.

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The 2012 Senior Notes were issued under indentures that contain restrictive covenants which, among other things, limit the ability of the Company, OBH, and their respective subsidiaries to create liens and enter into sale and leaseback transactions and limit the ability of the Company and OBH to consolidate, merge or transfer their properties and assets. The indentures do not contain any financial ratios or specified levels of net worth or liquidity to which the Company or OBH must adhere. In addition, a failure by the Company, OBH or their respective subsidiaries to pay principal and interest on covered debt, where such failure results in the acceleration of at least $75.0 million of the principal amount of covered debt, could trigger the acceleration of the 2012 Senior Notes.

Interest payments on the 2012 Senior Notes during the six months ended June 30, 2017 and 2016 totaled $6.3 million in both periods.

As of June 30, 2017, the Company and OBH were in compliance with all of the covenants under the 2012 Senior Notes and the Credit Facility. The closing of the OneBeacon Acquisition will not result in any default under the indenture for the 2012 Senior Notes. While the closing of the OneBeacon Acquisition would constitute an event of default under the Credit Facility, OneBeacon intends to voluntarily terminate the Credit Facility, which is undrawn, effective as of the closing.

Pursuant to the Merger Agreement, OneBeacon, without the prior written consent of Intact, cannot take certain actions until the effective time of the merger or termination of the Merger Agreement, including incurring any additional indebtedness, issuing equity, selling any material properties or assets, acquiring assets or making, or committing to make, capital expenditures, in each case except as permitted pursuant to the Merger Agreement.

Share Repurchase Authorization

On August 22, 2007, our Board authorized us to repurchase up to $200.0 million of OneBeacon's Class A common shares from time to time, subject to market conditions. Shares may be repurchased on the open market or through privately negotiated transactions. This authorization does not have a stated expiration date. Since the inception of this authorization, the Company has repurchased and retired 6.7 million of its Class A common shares. During the six months ended June 30, 2017, no shares were repurchased under the share repurchase authorization. During the six months ended June 30, 2016, 850,349 shares were repurchased under the share repurchase authorization for $10.6 million at an average share price of $12.42. The amount of authorization remaining is $75.0 million as of June 30, 2017.

During the six months ended June 30, 2017 and 2016, the Company repurchased 67,273 and 64,981 common shares, respectively, for $1.1 million and $0.9 million to satisfy employee income tax withholding pursuant to employee benefit plans. Shares repurchased pursuant to employee benefit plans do not reduce the board authorization referred to above.

Cash Flows

Detailed information concerning our cash flows during the six months ended June 30, 2017 and 2016 follows:

Cash flows from operations for the six months ended June 30, 2017 and 2016

Net cash flows provided from operations for the six months ended June 30, 2017 were $86.2 million compared to net cash flows used for operations of $17.3 million for the six months ended June 30, 2016. Net cash flows relating to operations increased primarily due to additional collateral received related to our Surety business, as well as lower paid losses.

Other Liquidity and Capital Resource Activities

During the six months ended June 30, 2017, we made payments with respect to our long-term incentive compensation plans totaling $6.5 million, in cash or by deferral into certain of our non-qualified compensation plans. These payments were made primarily with respect to 113,950 performance units, and 3,767,500 long-term cash awards for the 2014-2016 performance cycle.

During the six months ended June 30, 2016, we made payments with respect to our long-term incentive compensation plans totaling $9.3 million, in cash or by deferral into certain of our non-qualified compensation plans. These payments were made primarily with respect to 167,300 performance shares, 126,900 performance units, and 3,825,000 long-term cash awards for the 2013-2015 performance cycle.

Cash flows from investing and financing activities for the six months ended June 30, 2017 and 2016

Financing and Other Capital Activities

During the six months ended June 30, 2017 and 2016, we declared and paid $39.8 million and $39.6 million, respectively, of regular quarterly cash dividends to holders of OneBeacon's common shares.

During the six months ended June 30, 2017, we repurchased and retired no shares of our Class A common stock. During the six months ended June 30, 2016, we repurchased and retired 850,349 shares of our Class A common stock for $10.6 million at an average share price of $12.42 under the board authorization referred to above.

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During the six months ended June 30, 2017 and 2016, the Company repurchased 67,273 and 64,981 common shares, respectively, for $1.1 million and $0.9 million, respectively, to satisfy employee income tax withholding pursuant to employee benefit plans. Shares repurchased pursuant to employee benefit plans do not fall under the board authorization referred to above.

Recently Issued Accounting Pronouncements

Refer to Note 1—"Nature of Operations and Summary of Significant Accounting Policies" to the Company’s unaudited consolidated financial statements contained in this quarterly report and in the Company’s 2016 Annual Report on Form 10-K for a discussion of recently issued accounting pronouncements.

Fair Value of Financial Instruments

Refer to Note 5—"Investment Securities" to the Company’s unaudited consolidated financial statements contained in this quarterly report and Note 5—"Investment Securities" in the Company’s 2016 Annual Report on Form 10-K for discussion regarding assets measured at fair value using unobservable inputs.

Critical Accounting Estimates

Refer to the Company's 2016 Annual Report on Form 10-K for a complete discussion regarding our critical accounting estimates. As of June 30, 2017, there were no material changes to our critical accounting estimates.

FORWARD-LOOKING STATEMENTS

The information contained in this report may contain "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements, other than statements of historical facts, included or referenced in this report that address activities, events or developments which we expect will or may occur in the future are forward-looking statements. The words "will," "believe," "intend," "expect," "anticipate," "project," "estimate," "predict" and similar expressions are also intended to identify forward-looking statements. These forward-looking statements include, among others, statements with respect to our:

• change in book value per share or return on equity;

• business strategy;

• financial and operating targets or plans;

• incurred loss and loss adjustment expenses and the adequacy of our loss and loss adjustment expense reserves and related reinsurance;

• projections of revenues, income (or loss), earnings (or loss) per share, dividends, market share or other financial forecasts;

• expansion and growth of our business and operations;

• proposed merger with Intact Financial Corporation ("Intact");

• future capital expenditures; and

• pending legal proceedings.

These statements are based on certain assumptions and analyses made by us in light of our experience and judgments about historical trends, current conditions and expected future developments, as well as other factors believed to be appropriate in the circumstances. However, whether actual results and developments will conform to our expectations is subject to a number of risks, uncertainties or other factors which are described in more detail in Part II, Item 1A under the caption "Risk Factors" of this report and beginning on page 16 of the Company's 2016 Annual Report on Form 10-K, that could cause actual results to differ materially from expectations, including:

• recorded loss and loss adjustment expense reserves subsequently proving to have been inadequate;

• changes in interest rates, debt or equity markets or other market volatility that negatively impact our investment portfolio;

• competitive forces and the cyclicality of the property and casualty insurance industry;

• claims arising from catastrophic events, such as hurricanes, windstorms, earthquakes, floods or terrorist attacks;

• the continued availability of capital and financing;

• the continued availability and cost of reinsurance coverage and our ability to collect reinsurance recoverables;

• the ability to maintain data and system security;

• the outcome of litigation and other legal or regulatory proceedings;

• our ability to continue meeting our debt and related service obligations or to pay dividends;

• our ability to successfully develop new specialty businesses;

• changes in laws or regulations, or their interpretations, which are applicable to us, our competitors, our agents or our customers;

• actions taken by rating agencies from time to time with respect to us, such as financial strength or credit rating downgrades or placing our ratings on negative watch;

• our ability to retain key personnel;

• participation in guaranty funds and mandatory market mechanisms;

• our ability to maintain effective operating procedures and manage operational risk;

• changes to current shareholder dividend practice and regulatory restrictions on dividends;

• credit risk exposure in certain of our business operations;

• Bermuda law may afford less protection to shareholders;

• our status as a subsidiary of White Mountains, including potential conflicts of interest, competition, and related-party transaction;

• changes in tax laws or tax treaties;

• the risk that the proposed merger with Intact may not be completed on the currently contemplated timeline or at all;

• risks related to diverting management’s attention from our ongoing business operations and other risks related to the pendency of the proposed merger with Intact, including on our ability to retain and hire key personnel, our ability to maintain relationships with our customers, policyholders, brokers, service providers and others with whom we do business, our stock price and our business, financial condition and results of operations generally;

• the risk that shareholder litigation in connection with the proposed merger with Intact may result in significant costs of defense, indemnification and liability; and

• other factors, most of which are beyond our control.

Consequently, all of the forward-looking statements made in this report are qualified by these cautionary statements, and there can be no assurance that the anticipated results or developments will be realized or, even if substantially realized, that they will have the expected consequences. Readers should carefully review these risk factors, and are cautioned not to place undue reliance on our forward-looking statements. The forward-looking statements in this report speak only as of the date on which they are made. We assume no obligation to update publicly any such forward-looking statements, whether as a result of new information, future events or otherwise.

ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Refer to our 2016 Annual Report on Form 10-K and in particular Item 7A — "Quantitative and Qualitative Disclosures About Market Risk." As of June 30, 2017, there were no material changes to the market risks described in our most recent Annual Report on Form 10-K.

ITEM 4.    CONTROLS AND PROCEDURES

Management’s Quarterly Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in the reports that we file or submit under the Securities Exchange Act of 1934, as amended (the "Exchange Act") is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), as appropriate, to allow timely decisions regarding required financial disclosure.

The Company's management, with the participation of the CEO and CFO (the principal executive officer and principal financial officer, respectively), has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) of the Exchange Act) as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on this evaluation, the CEO and CFO have concluded that as of June 30, 2017, our disclosure controls and procedures are adequate and effective to provide reasonable assurance that material information required to be included in our periodic SEC reports is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms. During the quarter ended June 30, 2017, there were no changes with respect to our internal control over financial reporting that materially affected, or are reasonably likely to materially affect, internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

OneBeacon, and the insurance and reinsurance industry in general, is routinely subject to claims-related litigation and arbitration in the normal course of business, as well as litigation and arbitration that do not arise from, or directly relate to, claims activity. We believe that the outcome of these proceedings, even if determined adversely, would not have a material adverse effect on our business, financial condition and results of operations.

Litigation Related to the OneBeacon Acquisition

 On June 2, 2017, Stephen Bushansky, a purported Company shareholder, filed a class action complaint against the Company and each of the Company’s directors in the U.S. District Court for the District of Minnesota (the “Minnesota Court”), purportedly on behalf of the Company’s public shareholders. Thereafter, three additional lawsuits were filed in the Minnesota Court by additional purported shareholders, Darrin Dickers, Raymond Martino and Robert Berg (collectively with Bushansky, the “Plaintiffs”). The complaints in each pending class action allege that the Company’s preliminary proxy statement filed with the U.S. Securities and Exchange Commission (“SEC”) omitted or misrepresented certain material information, allegedly in violation of Sections 14(a) and 20(a) of the Securities Exchange Act of 1934 and SEC Rule 14a-9 and sought to enjoin the Company and Intact Financial Corporation from closing the OneBeacon Acquisition, or if the Acquisition closes, to award Plaintiffs damages and costs.

On June 26, 2017, Plaintiffs jointly filed a motion for preliminary injunction to enjoin the shareholder vote on the OneBeacon Acquisition, but withdrew their motion on July 7, 2017. Company shareholders approved the OneBeacon Acquisition on July 18, 2017 at a special general meeting of shareholders. Plaintiffs have not dismissed their cases and OneBeacon’s responsive pleadings are due August 14, 2017. The Company believes the cases lack merit and continues to vigorously defend this litigation.

Deutsche Bank Litigation

In June 2011, Deutsche Bank Trust Company Americas, Law Debenture Company of New York and Wilmington Trust Company (collectively referred to as “Plaintiffs”), in their capacity as trustees for certain senior notes issued by the Tribune Company (“Tribune”), filed lawsuits in various jurisdictions (the “Noteholder Actions”) against numerous defendants including OneBeacon, OneBeacon-sponsored benefit plans and other affiliates of White Mountains in their capacity as former shareholders of Tribune seeking recovery of the proceeds from the sale of common stock of Tribune in connection with Tribune's leveraged buyout in 2007 (the “LBO”). Tribune filed for bankruptcy in 2008 in the Delaware bankruptcy court (the “Bankruptcy Court”). The Bankruptcy Court granted Plaintiffs permission to commence these LBO-related actions, and in 2011, the Judicial Panel on Multidistrict Litigation granted a motion to consolidate the actions for pretrial matters and transferred all such proceedings to the United States District Court for the Southern District of New York (the SDNY). Plaintiffs seek recovery of the proceeds received by the former Tribune shareholders on a theory of constructive fraudulent transfer asserting that Tribune purchased or repurchased its common shares without receiving fair consideration at a time when it was, or as a result of the purchases of shares, was rendered, insolvent. OneBeacon has entered into a joint defense agreement with other affiliates of White Mountains that are defendants in the action. OneBeacon and OneBeacon-sponsored benefit plans received approximately $32 million for Tribune common stock tendered in connection with the LBO. The Court granted an omnibus motion to dismiss the Noteholders Action in September 2013 and plaintiffs appealed. On March 29, 2016, a three judge panel of the U.S Second Circuit Court of Appeals affirmed the dismissal of the Noteholders Action. On July 22, 2016, the Plaintiff's petition to the Second Circuit for reconsideration or for a rehearing en banc was denied in full. On September 9, 2016 the Plaintiffs filed for a writ of certiorari, seeking review in the United States Supreme Court.

In addition, OneBeacon, OneBeacon-sponsored benefit plans and other affiliates of White Mountains in their capacity as former shareholders of Tribune, along with thousands of former Tribune shareholders, have been named as defendants in an adversary proceeding brought by the Official Committee of Unsecured Creditors of the Tribune Company (the “Committee”), on behalf of the Tribune Company, which seeks to avoid the repurchase of shares by Tribune in the LBO on a theory of intentional fraudulent transfer (the “Committee Action”). Tribune emerged from bankruptcy in 2012, and a litigation trustee replaced the Committee as plaintiff in the Committee Action. This matter was consolidated for pretrial matters with the Noteholder Actions in the SDNY and was stayed pending the motion to dismiss in the Noteholder Action. An omnibus motion to dismiss the shareholder defendants in the Committee Action was filed in May 2014 and the motion was granted on January 6, 2017. The plaintiff has requested permission to move the SDNY to certify the decision as a final judgment capable of immediate appeal. No amount has been accrued in connection with this matter as of June 30, 2017, as the amount of loss, if any, cannot be reasonably estimated.

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ITEM 1A. RISK FACTORS

Our business is subject to a number of risks, including those identified in Item 1A - “Risk Factors” of our 2016 Annual Report on Form 10-K, that could have a material effect on our business, results of operations, financial condition and/or liquidity and that could cause our operating results to vary significantly from period to period. As of June 30, 2017, there have been no material changes to the risk factors disclosed in our most recent Annual Report on Form 10-K, except for those noted below. We may disclose changes to any risk factors presented or disclose additional factors from time to time in our future filings with the Securities and Exchange Commission.

Risks Related to the Merger

The pendency of the proposed merger with Intact could have a material and adverse effect on OneBeacon’s business, financial condition and results of operations.

The pendency of the proposed acquisition of OneBeacon by Intact could cause disruptions and create uncertainty surrounding OneBeacon’s business, including affecting OneBeacon’s relationships with its customers, policyholders, brokers, service providers and employees, which could have an adverse effect on its business, financial condition, results of operations and ability to retain and hire key personnel, regardless of whether the proposed merger is completed. In particular, OneBeacon could potentially lose customers, policyholders, brokers or service providers. In addition, OneBeacon has diverted, and will continue to divert, significant management resources towards the completion of the proposed merger, which could have a material and adverse effect on its business, financial condition and results of operations.

OneBeacon is also subject to certain restrictions on the conduct of its business prior to the consummation of the merger as provided in the merger agreement, which may adversely affect its ability to execute certain of its business strategies, including, among other things, the ability in certain cases to enter into material contracts, acquire or dispose of assets, incur indebtedness or incur capital expenditures. These restrictions could result in OneBeacon’s inability to respond effectively to competitive pressures, industry developments and future opportunities and may otherwise have a material and adverse effect on its business, financial condition and results of operations.

The merger is subject to conditions, including certain conditions that may not be satisfied, or satisfied on a timely basis. Failure to complete the merger could have a material and adverse effect on OneBeacon.

Completion of the merger is subject to the satisfaction or waiver of a number of closing conditions, including the receipt of required regulatory approvals or consents, including from the domestic insurance regulators of the states of Delaware, Pennsylvania, Texas and New York, the absence of any injunction or restraint enjoining the merger, as well as other conditions to closing as are customary in transactions such as the merger. Many of the conditions to closing are outside of OneBeacon’s control and may prevent, delay or otherwise adversely affect the completion of the merger.

If the merger is not completed on a timely basis, or at all, OneBeacon’s ongoing businesses may be adversely affected and OneBeacon will be subject to a number of risks, including the following:

• OneBeacon will be required to pay costs relating to the merger, such as legal, accounting, financial advisory and costs relating to regulatory filings and notices, SEC filing fees, printing and mailing costs and other transaction-related costs, fees and expenses, whether or not the merger is completed;

• time and resources committed by OneBeacon’s management to matters relating to the merger could otherwise have been devoted to OneBeacon’s existing business or to pursuing other beneficial opportunities;

• the manner in which brokers, insurers and other third parties perceive OneBeacon may be negatively impacted, which in turn could affect OneBeacon’s ability to compete for or write new business or obtain renewals in the marketplace;

• OneBeacon may experience negative reactions from current and prospective employees;

• OneBeacon’s stock price may decline significantly from the current market price to the extent its current stock price reflects a market assumption that the merger will occur;

• OneBeacon’s ratings may be adversely affected, which could have an adverse effect on its business, financial condition and results of operations; and

• OneBeacon could be subject to litigation related to any failure to complete the merger or related to any enforcement proceeding commenced against OneBeacon to perform its obligations under the merger agreement.

Additionally, in approving the merger agreement, OneBeacon’s board of directors considered a number of factors and potential benefits. If the merger is not completed, OneBeacon will not realize these and other anticipated benefits of the merger.

Lawsuits have been and may continue to be filed against OneBeacon or its board of directors or officers and could prevent or delay the completion of the merger or result in the payment of damages following the completion of the merger.

Transactions such as the merger are often subject to lawsuits filed against OneBeacon or its board of directors or officers in connection with the merger, which could prevent or delay the completion of the merger and result in substantial costs to OneBeacon, including costs associated with defense, indemnification and liability. To date, multiple purported class action

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lawsuits, which have been consolidated into one lawsuit, have been filed by shareholders seeking an award of unspecified damages, attorneys’ and other fees and costs and other relief. OneBeacon and its directors believe these claims are without merit and intend to vigorously defend the litigation. OneBeacon cannot predict the outcome of or estimate the possible loss or delay of the completion of the merger, if any, resulting from these matters.

ITEM 2.     UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Purchases of Equity Securities by the Issuer

On August 22, 2007, the Company's Board authorized the repurchase of up to $200.0 million of its Class A common shares from time to time, subject to market conditions. Shares may be repurchased on the open market or through privately negotiated transactions. This authorization does not have a stated expiration date. During the three months ended June 30, 2017, no shares were repurchased under the share repurchase authorization. As of June 30, 2017, an aggregate of 6.7 million Class A common shares were repurchased for $125.0 million under this authorization and retired. The amount of authorization remaining is $75.0 million as of June 30, 2017.

ITEM 6.     EXHIBITS

(a)   Exhibits

2.1**	Agreement and Plan of Merger, dated as of May 2, 2017, by and among OneBeacon Insurance Group, Ltd., Intact Financial Corporation, Intact Bermuda Holdings Ltd. and Intact Acquisition Co. Ltd. incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed on May 2, 2017.
10.1*	Form of OneBeacon Insurance Group, Ltd. 2017-2019 Performance Unit Award Agreement (combined ratio)
10.2*	Form of OneBeacon Insurance Group, Ltd. 2017-2019 Performance Unit Agreement (combined ratio and growth in book value per common share)
10.3**	Form of Retention Agreement for CEO incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on May 24, 2017.
10.4**	Form of Retention Agreement for Non-CEO Named Executive Officers incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed on May 24, 2017.
10.5**	OneBeacon Severance Plan incorporated by reference to Exhibit 10.3 to the Company’s Current Report on Form 8-K filed on May 24, 2017.
10.6**	OneBeacon 2017 Long-Term Incentive Plan incorporated by reference to Exhibit 4.4 to the Company’s Registration Statement on Form S-8 filed on May 26, 2017.
31.1*	Certification of T. Michael Miller pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Paul H. McDonough pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1***	Certification of T. Michael Miller pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2***	Certification of Paul H. McDonough pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.1*	The following financial information from OneBeacon Insurance Group, Ltd.'s Quarterly Report on Form 10-Q for the quarter ended June 30, 2017 formatted in XBRL: (i) Consolidated Balance Sheets, June 30, 2017 and December 31, 2016; (ii) Consolidated Statements of Operations and Comprehensive Income, Six Months Ended June 30, 2017 and 2016; (iii) Consolidated Statements of Common Shareholders' Equity, Six Months Ended June 30, 2017 and 2016; (iv) Consolidated Statements of Cash Flows, Six Months Ended June 30, 2017 and 2016; and (v) Notes to Consolidated Financial Statements.

_______________________________________________________________________________

* Filed Herewith

** Previously filed

***Furnished Herewith

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

		OneBeacon Insurance Group, Ltd.
Date:	August 4, 2017	By:	/s/ JOHN C. TREACY
			John C. Treacy Chief Accounting Officer and Treasurer*
*Executing as both the Chief Accounting Officer and a duly authorized officer of the Company

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EX-10.1

Exhibit 10.1

OneBeacon Insurance Group, Ltd.

Long-Term Incentive Plan

2017-2019 Performance Unit Award Agreement

THIS AWARD AGREEMENT (this “Agreement”) is made effective as of February 28, 2017, between OneBeacon Insurance Group, Ltd., a Bermuda company (the “Company”) and <First NAME> <Last NAME> (the “Participant”).

RECITALS:

WHEREAS, the Board of Directors of the Company (the “Board”) has adopted the OneBeacon 2017 Long-Term Incentive Plan, as may be amended or restated from time to time (the “Plan”), which Plan is incorporated herein by reference and made part of this Agreement;

WHEREAS, the Plan is subject to approval by the Company’s shareholders at the 2017 annual meeting; and

WHEREAS, subject to the approval of the Plan by the Company’s shareholders, the Performance Compensation Subcommittee of the Compensation Committee of the Board (the “Committee”) has determined that it would be in the best interests of the Company to grant the performance unit award provided for herein to the Participant pursuant to the Plan and the terms set forth herein.

NOW, THEREFORE, for good and valuable consideration the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.Definitions. Capitalized terms not defined in the body of this Agreement have the meanings ascribed to them in Annex A (attached hereto and incorporated by reference). Capitalized terms not defined in the body of this Agreement or in Annex A have the meanings ascribed to them in the Plan.

2.Grant of Performance Units. Pursuant to Section 8 of the Plan, the Company hereby grants to the Participant a Performance Unit Award (this “Award”), covering a number of units determined in the manner set forth in this Agreement (the “Units”), in consideration of services to be rendered by Participant to the Company.The target number ofUnits granted under this Award is <# Of UNITS> (the “Target Performance Units”). The value of one Unit shall be fixed at $100.00 (the “Unit Value”) for all purposes under this Agreement. The grant of Units hereunder is subject to approval of the Plan by the shareholders of the Company in accordance with Section 19 of the Plan. If such shareholder approval is not obtained, the grant of Units hereunder shall automatically terminate and become null and void and be of no further force or effect.

3.Award Period. The Award Period shall be January 1, 2017 through December 31, 2019.

4.Performance Percentage. The Performance Percentage shall be determined based on achievement against the Combined Ratio Performance Objective set forth on Annex A. The Performance Percentage may range from 0% to 200% of target.

5.Vesting. Except as otherwise provided herein or in the Plan, the Units will vest on the last day of the Award Period, December 31, 2019 (the “Vesting Date”), provided that the Participant has remained continuously employed with the Company and its subsidiaries through such date.

6.Award Value. As soon as administratively practicable after the end of the Award Period, the Committee shall certify the level attained for each Performance Objective. At such time, the Participant shall be awarded an Actual Value, if any, equal to the product of: (x) the number of Target Performance Units, multiplied by (y) the Performance Percentage (determined pursuant to Section 4), multiplied by (z) the Unit Value. The Award Value shall be subject to adjustments pursuant to the Plan and this Agreement.

7.Settlement. The Actual Value will be settled following the Committee’s certification, and in any event within the first 74 days of 2020 (the “Settlement Date”), except as set forth in Section 8. Settlement shall be subject to all terms and conditions of the Plan and to Participant’s compliance with Section 9. The Actual Value will be settled in cash, in the Company’s Class A common shares (“Shares”), or partly in cash and partly in Shares, as determined by the Committee.

(a) To the extent settled in cash, the cash value will equal (x) the Actual Value, multiplied by (y) the percentage of this Award settled in cash.

(b) To the extent settled in Shares, the number of Shares issued will equal (x) the Actual Value, divided by the fair market value of one Share on the date that the Committee certified the level attained for the Performance Objectives, multiplied by (y) the percentage of this Award settled in Shares.

8.Termination of Employment. This Award shall be canceled and forfeited, and no payment shall be made therefor, if the Participant’s continuous employment with the Company and its subsidiaries shall terminate for any reason prior to the Vesting Date, except as set forth below:

(a)Death or Disability. If the Participant’s employment with the Company and its subsidiaries terminates before the Vesting Date due to the Participant’s death or Disability, a pro rata portion of the Units shall vest as of the date on which such termination of employment occurs, determined as follows: (i) the number of Target Performance Units, multiplied by (ii) a percentage, the numerator of which is equal to the number of months from the beginning of January 1, 2017 through the last day of the calendar year in which the Participant’s termination of employment occurs, and the denominator of which is equal to 36. Notwithstanding the foregoing, in the case of termination of employment due to Disability, such pro rata vesting shall be subject to the Participant (or his representative, as appropriate) signing and delivering an effective and irrevocable general release of claims (“Release”), in the form provided by the Company. Such Release must become effective and irrevocable no later than the 61st day after termination of such Participant’s employment. Any such pro rata vested portion of the Units will be settled in cash, Shares or partly in cash and partly in Shares, as determined by the Committee, in the manner contemplated by Section 7. Such settlement shall be made (A) in the case of death, within 60 days following the date of termination of employment due to death, or (B) in the case of Disability, in connection with the next regularly scheduled payroll after the effectiveness of the Release. For the avoidance of doubt, this Section 8(a) shall not apply to any death or Disability of the Participant occurring after the date of termination of the Participant’s employment for any reason (including Retirement).

(b)Eligible Retirement. In the discretion of the Committee, if the Participant’s employment with the Company and its subsidiaries terminates before the Vesting Date due to the Participant’s Retirement, and the Participant executes and delivers a separation agreement in the form provided by the Company, containing noncompetition, nonsolicitation and other restrictive covenants, the Committee, in its sole discretion, may determine to provide for continued vesting credit of the Units, on a pro rata basis, determined as follows:

(i) the number of Target Performance Units shall be modified by multiplying (x) the original number of Target Performance Units set forth in Section 2 by (y) a fraction, the numerator of which is equal to the number of months from the beginning of the Award Period through the last day of the Performance Period in which the Participant’s termination of employment occurs, and the denominator of which is equal to 36 (the “Modified Target Performance Units”);

(ii) the excess of the original number of Target Performance Units set forth in Section 2 over the Modified Target Performance Units shall be immediately forfeited upon the Participant’s termination of employment;

(iii) the Modified Target Performance Units shall remain eligible to vest hereunder, and shall be settled based on their Actual Value; provided that, in determining Actual Value, the Performance Percentage used shall be determined by the Committee based on actual performance achievement through the end of the Performance Period in which the termination of employment occurred (subject to adjustments pursuant to the Plan and this Agreement).

Such pro rata vesting shall be subject to the Participant’s continued compliance with the noncompetition, nonsolicitation or other restrictive covenants in his separation agreement. In addition, such pro rata vesting shall be subject to the Participant (or his representative, as appropriate) signing and delivering an effective and irrevocable Release in the form provided by the Company. Such Release must be signed and delivered after the Committee’s certification of performance achievement through the end of the Performance Period (such determination to occur within the first 60 days of the year following such Performance Period), and must become effective and irrevocable on or before April 30th of the year of such certification (or such earlier date occurring between the date of certification and April 30th of such year as may be specified by the Company). Any such pro rata vested portion of the Units will be settled in cash, Shares or partly in cash and partly in Shares, as determined by the Committee, in the manner contemplated by Section 7 (except that, if the relevant Performance Unit is settled in Shares, the Actual Value shall be divided by the Fair Market Value of a Share on the last day of the Performance Period in which the Retirement occurred). Such settlement shall be made on the next regularly scheduled payroll after the effectiveness of the Release. Notwithstanding the foregoing, if the Participant breaches the noncompetition, nonsolicitation or other restrictive covenants in his separation agreement at any time, then the Participant’s outstanding Units shall be immediately canceled and forfeited upon such breach, and the full amount recognized from any prior vesting or settlement of the Units granted hereunder (and any gain thereto) shall be forfeited and the Participant shall be required to promptly repay such amounts to the Company within ten (10) days following such breach.

(c)Terminations after the Vesting Date but before Settlement. Notwithstanding anything herein to the contrary, if the Participant’s employment with the Company and its subsidiaries terminates on or after the Vesting Date but before the Settlement Date for any reason (including due to Retirement or a Termination Without Cause), then settlement of this Award shall be contingent on the Participant (or his representative, as appropriate) signing and delivering an effective and irrevocable Release, in the form provided by the Company. Such Release must be signed and delivered after the Committee’s certification of performance achievement through the end of the Award Period (such determination to occur within the first 60 days of the year following such Award Period), and must become effective and irrevocable on or before April 30th, 2020 (or such earlier date occurring between the date of certification and April 30, 2020, as may be specified by the Company). The settlement made in exchange for such Release shall be made in connection with the next regularly scheduled payroll after the effectiveness of such Release.

(d)Other. With respect to any Termination Without Cause, Constructive Termination or Adverse Change in the Plan occurring within 24 months after a Change in Control, Section 8(f) of the Plan shall apply to the Units. In addition, any continued vesting in connection with Related Employment shall be determined in the Committee’s sole discretion, pursuant to Section 8(e) of the Plan.

9.Withholding. The Participant agrees to make appropriate arrangements with the Company for satisfaction of any applicable income tax withholding requirements, including the payment to the Company, upon vesting and/or settlement of the Units (or such earlier or later date as may be applicable under the Internal Revenue Code), of all such taxes and other amounts, and the Company shall be authorized to take such action as may be necessary, in the opinion of the Company’s counsel (including, without limitation, withholding amounts from any compensation, including cash or Shares payable in settlement of this Award, or other amount owing from the Company to the Participant), to satisfy all obligations for the payment of such taxes and other amounts. Unless otherwise provided by the Company, tax withholding shall be at the applicable minimum statutory rate.

10.Reduction of the Award. Notwithstanding anything to the contrary herein, the Committee, in its sole discretion, but subject to Section 409A of the Code and other applicable law, may reduce any amounts payable to the Participant under this Agreement in order to satisfy any liabilities owed to the Company by the Participant.

11.Clawback Policy. Amounts paid pursuant to this Agreement are subject to clawback by the Company pursuant to the Clawback Policy adopted by the Board on June 16, 2010. The Clawback Policy generally provides that, in the event of a restatement of the financial statements of the Company for failure to comply with the federal securities laws due to misconduct of the Participant, the Board may require the Participant to reimburse the Company for all or a portion of his or her compensation, gain or other value realized thereafter on the vesting or settlement of the Units granted under this Agreement; provided, however, that in the event of fraud, the Participant shall reimburse the Company for all of such compensation, gain or other value realized.

12.Securities Laws. The granting of the Units and any other obligations of the Company under this Agreement shall be subject to all applicable federal, provincial, state, local and foreign laws, rules and regulations and to such approvals by any regulatory or governmental agency as may be required. If any portion of this Award is settled in Shares, the Participant will make or enter into such written representations, warranties and agreements as the Committee may reasonably request in order to comply with applicable securities laws and with this Agreement.

13.No Right to Continued Employment. Neither the Plan nor this Agreement shall be construed as giving the Participant the right to be retained in the employ of, or in any consulting relationship to, the Company or any of its subsidiaries. Further, the Company or any of its subsidiaries may at any time dismiss the Participant or discontinue any consulting relationship, free from any liability or any claim under the Plan or this Agreement, except as otherwise expressly provided herein in this Agreement or the Plan. In addition, nothing herein shall obligate the Company to make future awards to the Participant.

14.Award Subject to Plan. By entering into this Agreement, the Participant agrees and acknowledges that the Participant has received and read a copy of the Plan, understands the terms of the Plan and this Agreement and that this Award is subject to all of the terms and provisions set forth in the Plan and in this Agreement and accepts this Award subject to all such terms and conditions which are incorporated herein by reference, including, but not limited to, the requirement to execute a Confidentiality and Nonsolicitation Agreement. In the event of a conflict between any vesting or forfeiture provision contained in this Agreement and vesting or forfeiture provision contained in the Plan, this Agreement will govern and prevail. In the event of any other conflict between a term or provision contained in this Agreement and a term or provision of the Plan, the applicable terms and provisions of the Plan will govern and prevail.

15.Beneficiary Designation. The Participant may file with the Company a written designation of a beneficiary on such form as may be prescribed by the Company and may, from time to time, amend or revoke such designation. If no beneficiary is designated, if the designation is ineffective, or if the beneficiary dies before the balance of a Participant’s benefit is paid, the balance shall be paid to the Participant’s estate. Notwithstanding the foregoing, however, a Participant’s beneficiary shall be determined under applicable state law if such state law does not recognize beneficiary designations under Awards of this type and is not preempted by laws which recognize the provisions of this Section.

16.No Rights as Shareholder. The Participant will not be considered a shareholder of the Company for any purpose with respect to this Award unless and until Shares are issued to the Participant in settlement of this Award.

17.Adjustments. Without limiting Section 12 of the Plan, in the event of any certain changes or events affecting the Shares, the Company or one of its affiliates, or the financial statements of the Company (including any change in the outstanding Shares by reason of any stock split, stock or extraordinary cash dividend, recapitalization, merger, consolidation, reorganization, combination or exchange of Shares or other distribution (other than normal cash dividends) of Company assets to shareholders), the Committee is authorized to take certain actions under the Plan that the Committee may determine is appropriate, including: (i) making equitable adjustments, if any, in the terms

and conditions of this Award, including an adjustment in the target and maximum number of Shares or kind of Shares or other property that may be issued under this Award, or an adjustment to any measure of performance, or (ii) making provision for payment in cash or other property in replacement of this Award, or substitution or assumption of this Award by any successor. Any such adjustment shall be made by the Committee and shall be conclusive and binding for all purposes of the Plan.

18.Sections 409A and 457A of the Internal Revenue Code. The Participant will not be permitted to elect to defer any payments that may be made pursuant to this Award, unless the Participant is a participant in the Company’s Deferred Compensation Plan. This Award is intended to be compliant with Section 409A of the Code and, if applicable, fall within the “short-term deferral” exception of Section 457A of the Code, and shall be interpreted accordingly. Notwithstanding anything in this Agreement to the contrary, to the extent that this Award constitutes a deferral of compensation to which Section 409A of the Code applies:

(a) For purposes of any amount that becomes vested and payable upon a termination of employment, a termination of employment will be deemed to have occurred only at such time as the Participant has experienced a “separation from service” as such term is defined for purposes of Section 409A of the Code.

(b) If any amount subject to this Award shall become vested and payable as a result of the Participant’s separation from service at such time as the Participant is a “specified employee” within the meaning of Section 409A of the Code, then no payment shall be made, except as permitted under Section 409A of the Code, prior to the first business day after the earlier of (i) the date that is six months after the Participant’s separation from service or (ii) the Participant’s death. Unless a specified employee identification policy as contemplated by Section 409A of the Code has been adopted by the Company, specified employees will be identified in accordance with the default provisions specified under Section 409A of the Code.

(c) To the extent applicable, “Disabled” or “Disability” shall be defined in a manner consistent with Treasury Regulation 1.409A-3(i)(4).

19.No Transfer. Subject to any exceptions set forth in this Agreement or the Plan, the Units may not be sold, assigned, transferred, pledged, hypothecated or otherwise disposed of or encumbered by the Participant, and shall not be subject to execution, attachment or similar process, except by will or the laws of descent and distribution.

20.Successors and Assigns. This Award shall be binding upon and inure to the benefit of the Company and its successors and assigns, and of the Participant and the beneficiaries, executors, administrators, heirs and successors of the Participant. If the Participant is employed by a business unit of the Company which is sold or transferred, the Company shall request the purchaser of such business unit (the “Purchaser”) to fully assume the obligations of the Company under this Award or provide a substitute or replacement award of equal economic value, as determined by the Committee. If a Purchaser declines to assume such obligations or provide such a substitute or replacement award, the Company shall remain obligated under the terms of this Award; provided that the Company may condition vesting on the Participant’s continued employment with the Purchaser, subject to applicable law.

21.Amendment; Waiver. The Committee at any time, and from time to time, may amend the terms of this Agreement; provided, however, that the rights of the Participant shall not be materially adversely affected without the Participant’s written consent (except to the extent permitted under the Plan). Any right of the Company contained in this Agreement may be waived in writing by the Committee. No waiver of any right hereunder by any party shall operate as a waiver of any other right, or as a waiver of the same right with respect to any subsequent occasion for its exercise, or as a waiver of any right to damages.

22.Notice. Any notice necessary under this Award shall be addressed to the Corporate Secretary of the Company at the Company’s principal executive offices and to the Participant at the address appearing in the personnel

records of the Company for such Participant or to either party at such other address as such party, hereto, may hereafter designate in writing to the other. Any such notice shall be deemed effective upon receipt thereof by the addressee.

23.Severability. The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement, and each other provision of this Agreement shall be severable and enforceable to the extent permitted by law.

24.Headings. The headings of the Sections hereof are provided for convenience only and are not to serve as a basis for interpretation or construction, and shall not constitute a part, of this Agreement.

25.Governing Law. This Agreement shall be governed by and construed in accordance with the laws of Bermuda.

26.Entire Agreement. This Agreement (including Annex A), the Plan, and the rules and procedures adopted by the Committee, contain all of the provisions applicable to this Award and no other statements, documents or practices may modify, waive or alter such provisions unless expressly set forth in writing, signed by an authorized officer of the Company and delivered to Participant.

27.Signature in Counterparts. This Agreement may be signed in counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement effective as of the day and year first above written.

OneBeacon Insurance Group, Ltd.

By:__________________________________ By:________________________________

<first><last> T. Michael Miller

President and Chief Executive Officer

Award Details:

2017-2019 Performance Unit Plan - CR

<# Units> Units Granted

Annex A

2017-2019 PERFORMANCE PERCENTAGE

Combined Ratio

	Combined Ratio for the Award Period	Performance Percentage
Maximum	91.5% or lower	200%
Target	96.5%	100%
Threshold	101.5% or higher	0%

* “Combined Ratio” means reported GAAP Combined Ratio for the underwriting reportable segments (currently defined as the summation of the Specialty Industries and Specialty Products reportable segments, to be adjusted to include any additional underwriting reportable segments in the future).

* The Combined Ratio for the Award Period as a whole will be the average (mean) of the Combined Ratio for each of the three Performance Periods. Combined Ratio will be calculated to the nearest one-tenth of one percent. “Performance Period” means each of the fiscal years of the Company ending December 31, 2017, 2018 and 2019, respectively.

* Linear interpolation applies between data points (i.e., between threshold and target, and between target and maximum).

EX-10.2

Exhibit 10.2

OneBeacon Insurance Group, Ltd.

Long-Term Incentive Plan

2017-2019 Performance Unit Award Agreement

THIS AWARD AGREEMENT (this “Agreement”) is made, effective as of February 28, 2017, between OneBeacon Insurance Group, Ltd., a Bermuda company (the “Company”) and <First NAME> <Last NAME> (the “Participant”).

RECITALS:

WHEREAS, the Board of Directors of the Company (the “Board”) has adopted the OneBeacon 2017 Long-Term Incentive Plan, as may be amended or restated from time to time (the “Plan”), which Plan is incorporated herein by reference and made part of this Agreement;

WHEREAS, the Plan is subject to approval by the Company’s shareholders at the 2017 annual meeting; and

WHEREAS, subject to the approval of the Plan by the Company’s shareholders, the Performance Compensation Subcommittee of the Compensation Committee of the Board (the “Committee”) has determined that it would be in the best interests of the Company to grant the performance unit award provided for herein to the Participant pursuant to the Plan and the terms set forth herein.

NOW, THEREFORE, for good and valuable consideration the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.Definitions. Capitalized terms not defined in the body of this Agreement have the meanings ascribed to them in Annex A (attached hereto and incorporated by reference). Capitalized terms not defined in the body of this Agreement or in Annex A have the meanings ascribed to them in the Plan.

2.Grant of Performance Units. Pursuant to Section 8 of the Plan, the Company hereby grants to the Participant a Performance Unit Award (this “Award”), covering a number of units determined in the manner set forth in this Agreement (the “Units”), in consideration of services to be rendered by Participant to the Company.The target number ofUnits granted under this Award is <# Of UNITS> (the “Target Performance Units”). The value of one Unit shall be fixed at $100.00 (the “Unit Value”) for all purposes under this Agreement. The grant of Units hereunder is subject to approval of the Plan by the shareholders of the Company in accordance with Section 19 of the Plan. If such shareholder approval is not obtained, the grant of Units hereunder shall automatically terminate and become null and void and be of no further force or effect.

3.Award Period. The Award Period shall be January 1, 2017 through December 31, 2019.

4.Performance Percentage. The Performance Percentage shall be determined based on achievement against two performance measures during the Award Period, weighted as follows: (a) Combined Ratio (67%) and (b) Growth in Book Value per Share (“GBVPS”) (33%). In each case, achievement will be measured against the Performance Objectives set forth on Annex A. The Performance Percentage may range from 0% to 200% of target, and shall equal the sum of:

(a) The Combined Ratio Performance Factor set forth on Annex A, multiplied by 67%; and

(b) The GBVPS Performance Factor set forth on Annex A, multiplied by 33%.

5.Vesting. Except as otherwise provided herein or in the Plan, the Units will vest on the last day of the Award Period, December 31, 2019 (the “Vesting Date”), provided that the Participant has remained continuously employed with the Company and its subsidiaries through such date.

6.Award Value. As soon as administratively practicable after the end of the Award Period, the Committee shall certify the level attained for each Performance Objective. At such time, the Participant shall be awarded an Actual Value, if any, equal to the product of: (x) the number of Target Performance Units, multiplied by (y) the Performance Percentage (determined pursuant to Section 4), multiplied by (z) the Unit Value. The Award Value shall be subject to adjustments pursuant to the Plan and this Agreement.

7.Settlement. The Actual Value will be settled following the Committee’s certification, and in any event within the first 74 days of 2020 (the “Settlement Date”), except as set forth in Section 8. Settlement shall be subject to all terms and conditions of the Plan and to Participant’s compliance with Section 9. The Actual Value will be settled in cash, in the Company’s Class A common shares (“Shares”), or partly in cash and partly in Shares, as determined by the Committee.

(a) To the extent settled in cash, the cash value will equal (x) the Actual Value, multiplied by (y) the percentage of this Award settled in cash.

(b) To the extent settled in Shares, the number of Shares issued will equal (x) the Actual Value, divided by the fair market value of one Share on the date that the Committee certified the level attained for the Performance Objectives, multiplied by (y) the percentage of this Award settled in Shares.

8.Termination of Employment. This Award shall be canceled and forfeited, and no payment shall be made therefor, if the Participant’s continuous employment with the Company and its subsidiaries shall terminate for any reason prior to the Vesting Date, except as set forth below:

(a)Death or Disability. If the Participant’s employment with the Company and its subsidiaries terminates before the Vesting Date due to the Participant’s death or Disability, a pro rata portion of the Units shall vest as of the date on which such termination of employment occurs, determined as follows: (i) the number of Target Performance Units, multiplied by (ii) a percentage, the numerator of which is equal to the number of months from the beginning of January 1, 2017 through the last day of the calendar year in which the Participant’s termination of employment occurs, and the denominator of which is equal to 36. Notwithstanding the foregoing, in the case of termination of employment due to Disability, such pro rata vesting shall be subject to the Participant (or his representative, as appropriate) signing and delivering an effective and irrevocable general release of claims (“Release”), in the form provided by the Company. Such Release must become effective and irrevocable no later than the 61st day after termination of such Participant’s employment. Any such pro rata vested portion of the Units will be settled in cash, Shares or partly in cash and partly in Shares, as determined by the Committee, in the manner contemplated by Section 7. Such settlement shall be made (A) in the case of death, within 60 days following the date of termination of employment due to death, or (B) in the case of Disability, in connection with the next regularly scheduled payroll after the effectiveness of the Release. For the avoidance of doubt, this Section 8(a) shall not apply to any death or Disability of the Participant occurring after the date of termination of the Participant’s employment for any reason (including Retirement).

(b)Eligible Retirement. In the discretion of the Committee, if the Participant’s employment with the Company and its subsidiaries terminates before the Vesting Date due to the Participant’s Retirement, and the Participant executes and delivers a separation agreement in the form provided by the Company, containing noncompetition, nonsolicitation and other restrictive covenants, the Committee, in its sole discretion, may determine to provide for continued vesting credit of the Units, on a pro rata basis, determined as follows:

(i) the number of Target Performance Units shall be modified by multiplying (x) the original number of Target Performance Units set forth in Section 2 by (y) a fraction, the numerator of which is equal to the number of months from the beginning of the Award Period through the last day of

the Performance Period in which the Participant’s termination of employment occurs, and the denominator of which is equal to 36 (the “Modified Target Performance Units”);

(ii) the excess of the original number of Target Performance Units set forth in Section 2 over the Modified Target Performance Units shall be immediately forfeited upon the Participant’s termination of employment;

(iii) the Modified Target Performance Units shall remain eligible to vest hereunder, and shall be settled based on their Actual Value; provided that, in determining Actual Value, the Performance Percentage used shall be determined by the Committee based on actual performance achievement through the end of the Performance Period in which the termination of employment occurred (subject to adjustments pursuant to the Plan and this Agreement).

Such pro rata vesting shall be subject to the Participant’s continued compliance with the noncompetition, nonsolicitation or other restrictive covenants in his separation agreement. In addition, such pro rata vesting shall be subject to the Participant (or his representative, as appropriate) signing and delivering an effective and irrevocable Release in the form provided by the Company. Such Release must be signed and delivered after the Committee’s certification of performance achievement through the end of the Performance Period (such determination to occur within the first 60 days of the year following such Performance Period), and must become effective and irrevocable on or before April 30th of the year of such certification (or such earlier date occurring between the date of certification and April 30th of such year as may be specified by the Company). Any such pro rata vested portion of the Units will be settled in cash, Shares or partly in cash and partly in Shares, as determined by the Committee, in the manner contemplated by Section 7 (except that, if the relevant Performance Unit is settled in Shares, the Actual Value shall be divided by the Fair Market Value of a Share on the last day of the Performance Period in which the Retirement occurred). Such settlement shall be made on the next regularly scheduled payroll after the effectiveness of the Release. Notwithstanding the foregoing, if the Participant breaches the noncompetition, nonsolicitation or other restrictive covenants in his separation agreement at any time, then the Participant’s outstanding Units shall be immediately canceled and forfeited upon such breach, and the full amount recognized from any prior vesting or settlement of the Units granted hereunder (and any gain thereto) shall be forfeited and the Participant shall be required to promptly repay such amounts to the Company within ten (10) days following such breach.

(c)Terminations after the Vesting Date but before Settlement. Notwithstanding anything herein to the contrary, if the Participant’s employment with the Company and its subsidiaries terminates on or after the Vesting Date but before the Settlement Date for any reason (including due to Retirement or a Termination Without Cause), then settlement of this Award shall be contingent on the Participant (or his representative, as appropriate) signing and delivering an effective and irrevocable Release, in the form provided by the Company. Such Release must be signed and delivered after the Committee’s certification of performance achievement through the end of the Award Period (such determination to occur within the first 60 days of the year following such Award Period), and must become effective and irrevocable on or before April 30th, 2020 (or such earlier date occurring between the date of certification and April 30, 2020, as may be specified by the Company). The settlement made in exchange for such Release shall be made in connection with the next regularly scheduled payroll after the effectiveness of such Release.

(d)Other. With respect to any Termination Without Cause, Constructive Termination or Adverse Change in the Plan occurring within 24 months after a Change in Control, Section 8(f) of the Plan shall apply to the Units. In addition, any continued vesting in connection with Related Employment shall be determined in the Committee’s sole discretion, pursuant to Section 8(e) of the Plan.

9.Withholding. The Participant agrees to make appropriate arrangements with the Company for satisfaction of any applicable income tax withholding requirements, including the payment to the Company, upon vesting and/or settlement of the Units (or such earlier or later date as may be applicable under the Internal Revenue Code), of all such taxes and other amounts, and the Company shall be authorized to take such action as may be necessary, in the opinion of the Company’s counsel (including, without limitation, withholding amounts from any compensation,

including cash or Shares payable in settlement of this Award, or other amount owing from the Company to the Participant), to satisfy all obligations for the payment of such taxes and other amounts. Unless otherwise provided by the Company, tax withholding shall be at the applicable minimum statutory rate.

10.Reduction of the Award. Notwithstanding anything to the contrary herein, the Committee, in its sole discretion, but subject to Section 409A of the Code and other applicable law, may reduce any amounts payable to the Participant under this Agreement in order to satisfy any liabilities owed to the Company by the Participant.

11.Clawback Policy. Amounts paid pursuant to this Agreement are subject to clawback by the Company pursuant to the Clawback Policy adopted by the Board on June 16, 2010. The Clawback Policy generally provides that, in the event of a restatement of the financial statements of the Company for failure to comply with the federal securities laws due to misconduct of the Participant, the Board may require the Participant to reimburse the Company for all or a portion of his or her compensation, gain or other value realized thereafter on the vesting or settlement of the Units granted under this Agreement; provided, however, that in the event of fraud, the Participant shall reimburse the Company for all of such compensation, gain or other value realized.

12.Securities Laws. The granting of the Units and any other obligations of the Company under this Agreement shall be subject to all applicable federal, provincial, state, local and foreign laws, rules and regulations and to such approvals by any regulatory or governmental agency as may be required. If any portion of this Award is settled in Shares, the Participant will make or enter into such written representations, warranties and agreements as the Committee may reasonably request in order to comply with applicable securities laws and with this Agreement.

13.No Right to Continued Employment. Neither the Plan nor this Agreement shall be construed as giving the Participant the right to be retained in the employ of, or in any consulting relationship to, the Company or any of its subsidiaries. Further, the Company or any of its subsidiaries may at any time dismiss the Participant or discontinue any consulting relationship, free from any liability or any claim under the Plan or this Agreement, except as otherwise expressly provided herein in this Agreement or the Plan. In addition, nothing herein shall obligate the Company to make future awards to the Participant.

14.Award Subject to Plan. By entering into this Agreement, the Participant agrees and acknowledges that the Participant has received and read a copy of the Plan, understands the terms of the Plan and this Agreement and that this Award is subject to all of the terms and provisions set forth in the Plan and in this Agreement and accepts this Award subject to all such terms and conditions which are incorporated herein by reference, including, but not limited to, the requirement to execute a Confidentiality and Nonsolicitation Agreement. In the event of a conflict between any vesting or forfeiture provision contained in this Agreement and vesting or forfeiture provision contained in the Plan, this Agreement will govern and prevail. In the event of any other conflict between a term or provision contained in this Agreement and a term or provision of the Plan, the applicable terms and provisions of the Plan will govern and prevail.

15.Beneficiary Designation. The Participant may file with the Company a written designation of a beneficiary on such form as may be prescribed by the Company and may, from time to time, amend or revoke such designation. If no beneficiary is designated, if the designation is ineffective, or if the beneficiary dies before the balance of a Participant’s benefit is paid, the balance shall be paid to the Participant’s estate. Notwithstanding the foregoing, however, a Participant’s beneficiary shall be determined under applicable state law if such state law does not recognize beneficiary designations under Awards of this type and is not preempted by laws which recognize the provisions of this Section.

16.No Rights as Shareholder. The Participant will not be considered a shareholder of the Company for any purpose with respect to this Award unless and until Shares are issued to the Participant in settlement of this Award.

17.Adjustments. Without limiting Section 12 of the Plan, in the event of any certain changes or events affecting the Shares, the Company or one of its affiliates, or the financial statements of the Company (including any change in the outstanding Shares by reason of any stock split, stock or extraordinary cash dividend, recapitalization,

merger, consolidation, reorganization, combination or exchange of Shares or other distribution (other than normal cash dividends) of Company assets to shareholders), the Committee is authorized to take certain actions under the Plan that the Committee may determine is appropriate, including: (i) making equitable adjustments, if any, in the terms and conditions of this Award, including an adjustment in the target and maximum number of Shares or kind of Shares or other property that may be issued under this Award, or an adjustment to any measure of performance, or (ii) making provision for payment in cash or other property in replacement of this Award, or substitution or assumption of this Award by any successor. Any such adjustment shall be made by the Committee and shall be conclusive and binding for all purposes of the Plan.

18.Sections 409A and 457A of the Internal Revenue Code. The Participant will not be permitted to elect to defer any payments that may be made pursuant to this Award, unless the Participant is a participant in the Company’s Deferred Compensation Plan. This Award is intended to be compliant with Section 409A of the Code and, if applicable, fall within the “short-term deferral” exception of Section 457A of the Code, and shall be interpreted accordingly. Notwithstanding anything in this Agreement to the contrary, to the extent that this Award constitutes a deferral of compensation to which Section 409A of the Code applies:

(a) For purposes of any amount that becomes vested and payable upon a termination of employment, a termination of employment will be deemed to have occurred only at such time as the Participant has experienced a “separation from service” as such term is defined for purposes of Section 409A of the Code.

(b) If any amount subject to this Award shall become vested and payable as a result of the Participant’s separation from service at such time as the Participant is a “specified employee” within the meaning of Section 409A of the Code, then no payment shall be made, except as permitted under Section 409A of the Code, prior to the first business day after the earlier of (i) the date that is six months after the Participant’s separation from service or (ii) the Participant’s death. Unless a specified employee identification policy as contemplated by Section 409A of the Code has been adopted by the Company, specified employees will be identified in accordance with the default provisions specified under Section 409A of the Code.

(c) To the extent applicable, “Disabled” or “Disability” shall be defined in a manner consistent with Treasury Regulation 1.409A-3(i)(4).

19.No Transfer. Subject to any exceptions set forth in this Agreement or the Plan, the Units may not be sold, assigned, transferred, pledged, hypothecated or otherwise disposed of or encumbered by the Participant, and shall not be subject to execution, attachment or similar process, except by will or the laws of descent and distribution.

20.Successors and Assigns. This Award shall be binding upon and inure to the benefit of the Company and its successors and assigns, and of the Participant and the beneficiaries, executors, administrators, heirs and successors of the Participant. If the Participant is employed by a business unit of the Company which is sold or transferred, the Company shall request the purchaser of such business unit (the “Purchaser”) to fully assume the obligations of the Company under this Award or provide a substitute or replacement award of equal economic value, as determined by the Committee. If a Purchaser declines to assume such obligations or provide such a substitute or replacement award, the Company shall remain obligated under the terms of this Award; provided that the Company may condition vesting on the Participant’s continued employment with the Purchaser, subject to applicable law.

21.Amendment; Waiver. The Committee at any time, and from time to time, may amend the terms of this Agreement; provided, however, that the rights of the Participant shall not be materially adversely affected without the Participant’s written consent (except to the extent permitted under the Plan). Any right of the Company contained in this Agreement may be waived in writing by the Committee. No waiver of any right hereunder by any party shall operate as a waiver of any other right, or as a waiver of the same right with respect to any subsequent occasion for its exercise, or as a waiver of any right to damages.

22.Notice. Any notice necessary under this Award shall be addressed to the Corporate Secretary of the Company at the Company’s principal executive offices and to the Participant at the address appearing in the personnel records of the Company for such Participant or to either party at such other address as such party, hereto, may hereafter designate in writing to the other. Any such notice shall be deemed effective upon receipt thereof by the addressee.

23.Severability. The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement, and each other provision of this Agreement shall be severable and enforceable to the extent permitted by law.

24.Headings. The headings of the Sections hereof are provided for convenience only and are not to serve as a basis for interpretation or construction, and shall not constitute a part, of this Agreement.

25.Governing Law. This Agreement shall be governed by and construed in accordance with the laws of Bermuda.

26.Entire Agreement. This Agreement (including Annex A), the Plan, and the rules and procedures adopted by the Committee, contain all of the provisions applicable to this Award and no other statements, documents or practices may modify, waive or alter such provisions unless expressly set forth in writing, signed by an authorized officer of the Company and delivered to Participant.

27.Signature in Counterparts. This Agreement may be signed in counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement effective as of the day and year first above written.

OneBeacon Insurance Group, Ltd.

By:__________________________________ By: ________________________________

<first><last> T. Michael Miller

President and Chief Executive Officer

Award Details:

2017-2019 Performance Unit Plan - CR/GBVPS

<# Units> Units Granted

Annex A

2017-2019 PERFORMANCE PERCENTAGE

Performance Objectives are weighted 67% to Combined Ratio performance and 33% to GBVPS performance.

Combined Ratio

	Combined Ratio for the Award Period	Combined Ratio Performance Factor
Maximum	91.5% or lower	200%
Target	96.5%	100%
Threshold	101.5% or higher	0%

* “Combined Ratio” means reported GAAP Combined Ratio for the underwriting reportable segments (currently defined as the summation of the Specialty Industries and Specialty Products reportable segments, to be adjusted to include any additional underwriting reportable segments in the future).

* The Combined Ratio for the Award Period as a whole will be the average (mean) of the Combined Ratio for each of the three Performance Periods. Combined Ratio will be calculated to the nearest one-tenth of one percent. “Performance Period” means each of the fiscal years of the Company ending December 31, 2017, 2018 and 2019, respectively.

* Linear interpolation applies between data points (i.e., between threshold and target, and between target and maximum).

Growth in Book Value per Common Share (GBVPS)

	GBVPS for the Award Period	GBVPS Performance Factor
Maximum	17% or higher	200%
Target	10%	100%
Threshold	3% or lower	0%

* “GBVPS” means Growth in Book Value per Common Share, including an adjustment for dividends paid, calculated on an internal rate of return basis.

* The GBVPS for the Award Period as a whole will be the average (mean) of GBVPS for each of the three Performance Periods. GBVPS will be calculated to the nearest one-tenth of one percent.

* Linear interpolation applies between data points (i.e., between threshold and target, and between target and maximum).

EX-31.1

Exhibit 31.1

302 CERTIFICATION

I, T. Michael Miller, President and Chief Executive Officer, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of OneBeacon Insurance Group, Ltd.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	August 4, 2017	/s/ T. MICHAEL MILLER
		T. Michael Miller President and Chief Executive Officer

EX-31.2

Exhibit 31.2

302 CERTIFICATION

I, Paul H. McDonough, Executive Vice President and Chief Financial Officer, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of OneBeacon Insurance Group, Ltd.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	August 4, 2017	/s/ PAUL H. MCDONOUGH
		Paul H. McDonough Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of OneBeacon Insurance Group, Ltd. (the “Company”) on Form 10-Q for the period ending June 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, T. Michael Miller, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 4, 2017	/s/ T. MICHAEL MILLER
		T. Michael Miller President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of OneBeacon Insurance Group, Ltd. (the “Company”) on Form 10-Q for the period ending June 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Paul H. McDonough, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 4, 2017	/s/ PAUL H. MCDONOUGH
		Paul H. McDonough Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Entity Registrant Name	OneBeacon Insurance Group, Ltd.
Entity Central Index Key	0001369817
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Class A common
Entity Common Stock, Shares Outstanding		22,986,618
Class B common
Entity Common Stock, Shares Outstanding		71,754,738

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investment Securities:
Fixed maturity investments, at fair value (amortized cost: $2,269.8 in 2017 and $2,164.4 in 2016)	$ 2,288.6	$ 2,169.1
Short-term investments, at amortized cost (which approximates fair value)	55.5	112.1
Common equity securities, at fair value (cost: $183.8 in 2017 and $182.3 in 2016)	205.5	188.7
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	134.1	150.5
Total investment securities	2,683.7	2,620.4
Cash	71.3	69.6
Reinsurance recoverables	198.0	179.5
Premiums receivable	245.4	228.3
Deferred acquisition costs	106.9	96.3
Ceded unearned premiums	56.6	44.2
Net deferred tax asset	130.1	126.7
Investment income accrued	12.9	11.3
Accounts receivable on unsettled investment sales	5.8	1.4
Other assets	185.7	212.2
Total assets	3,696.4	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves	1,411.2	1,365.6
Unearned premiums	595.2	575.1
Funds held under insurance contracts	210.2	153.0
Debt	273.3	273.2
Accounts payable on unsettled investment purchases	9.3	0.0
Other liabilities	182.4	197.8
Total liabilities	2,681.6	2,564.7
OneBeacon's common shareholders' equity
Preference shares (Par value $0.01; 80,000,000 authorized shares; none issued or outstanding)	0.0	0.0
Common shares and paid-in surplus (Class A: par value $0.01; 200,000,000 authorized shares; 22,986,618 and 22,592,731 issued and outstanding)(Class B: par value $0.01; 200,000,000 authorized shares; 71,754,738 issued and outstanding for both periods)	1,014.5	1,013.2
Retained earnings	4.5	12.3
Accumulated other comprehensive loss (AOCL)	(3.9)	(4.2)
Total OneBeacon's common shareholders' equity	1,015.1	1,021.3
Total noncontrolling interests	(0.3)	3.9
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,014.8	1,025.2
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$ 3,696.4	$ 3,589.9

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Common shares, issued shares (in shares)	94,741,356	94,347,469
Common shares, outstanding shares (in shares)	94,741,356	94,347,469
Preferred shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares, authorized shares (in shares)	80,000,000	80,000,000
Preferred shares, issued shares (in shares)	0	0
Preferred shares, outstanding shares (in shares)	0	0
Trading Securities, Debt, Amortized Cost	$ 2,269.8	$ 2,164.4
Trading Securities, Equity, Cost	183.8	182.3
Other Investments and Securities, at Cost	$ 107.5	$ 120.9
Class A common
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized shares (in shares)	200,000,000	200,000,000
Common shares, issued shares (in shares)	22,986,618	22,592,731
Common shares, outstanding shares (in shares)	22,986,618	22,592,731
Class B common
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized shares (in shares)	200,000,000	200,000,000
Common shares, issued shares (in shares)	71,754,738	71,754,738
Common shares, outstanding shares (in shares)	71,754,738	71,754,738

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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Earned premiums	$ 277.4	$ 271.4	$ 539.2	$ 550.0
Net investment income	14.5	12.1	26.7	26.5
Net realized and change in unrealized investment gains	12.3	24.7	27.3	41.3
Net other revenues	2.1	0.8	5.5	1.7
Total revenues	306.3	309.0	598.7	619.5
Expenses
Loss and loss adjustment expenses	188.6	179.7	339.2	338.5
Policy acquisition expenses	48.4	48.7	93.7	99.7
Other underwriting expenses	59.6	50.9	111.3	106.2
General and administrative expenses	8.8	3.5	13.8	7.4
Interest expense	3.3	3.2	6.6	6.5
Total expenses	308.7	286.0	564.6	558.3
Pre-tax income (loss)	(2.4)	23.0	34.1	61.2
Income tax (expense) benefit	2.7	2.0	(1.2)	10.7
Net income including noncontrolling interests	0.3	25.0	32.9	71.9
Less: Net income attributable to noncontrolling interests	(0.4)	(0.5)	(0.9)	(1.0)
Net income (loss) attributable to OneBeacon's common shareholders	(0.1)	24.5	32.0	70.9
Other comprehensive income, net of tax	0.2	0.2	0.3	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$ 0.1	$ 24.7	$ 32.3	$ 71.1
Earnings per share attributable to OneBeacon's common shareholders—basic and diluted
Net income attributable to OneBeacon's common shareholders per share	$ 0.00	$ 0.26	$ 0.34	$ 0.75
Dividends declared and paid per OneBeacon's common share	$ 0.21	$ 0.21	$ 0.42	$ 0.42

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CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common shares outstanding	Common shares and paid-in surplus	Retained earnings	AOCL	Total OneBeacon common shareholders' equity	Noncontrolling interests, after tax
Common shares, outstanding shares (in shares) at Dec. 31, 2015		95,089,240
Balances at Dec. 31, 2015	$ 1,004.5		$ 1,022.0	$ (15.9)	$ (5.2)	$ 1,000.9	$ 3.6
Increase (Decrease) in Stockholders' Equity
Net income	71.9		0.0	70.9	0.0	70.9	1.0
Other comprehensive income, net of tax	0.2		0.0	0.0	0.2	0.2	0.0
Total comprehensive income	72.1		0.0	70.9	0.2	71.1	1.0
Amortization of restricted share awards	1.3		1.3	0.0	0.0	1.3	0.0
Issuance of common shares (in shares)		173,559
Issuance of common shares	0.1		0.0	0.0	0.0	0.0	0.1
Repurchase and retirement of common shares (in shares)		(915,330)
Repurchase and retirement of common shares	(11.5)		(11.5)	0.0	0.0	(11.5)	0.0
Dividends	(40.6)		0.0	(39.6)	0.0	(39.6)	(1.0)
Common shares, outstanding shares (in shares) at Jun. 30, 2016		94,347,469
Balances at Jun. 30, 2016	$ 1,025.9		1,011.8	15.4	(5.0)	1,022.2	3.7
Common shares, outstanding shares (in shares) at Dec. 31, 2016	94,347,469	94,347,469
Balances at Dec. 31, 2016	$ 1,025.2		1,013.2	12.3	(4.2)	1,021.3	3.9
Increase (Decrease) in Stockholders' Equity
Net income	32.9		0.0	32.0	0.0	32.0	0.9
Other comprehensive income, net of tax	0.3		0.0	0.0	0.3	0.3	0.0
Total comprehensive income	33.2		0.0	32.0	0.3	32.3	0.9
Amortization of restricted share awards	2.4		2.4	0.0	0.0	2.4	0.0
Issuance of common shares (in shares)		461,160
Issuance of common shares	0.0		0.0	0.0	0.0	0.0	0.0
Repurchase and retirement of common shares (in shares)		(67,273)
Repurchase and retirement of common shares	(5.2)		(1.1)	0.0	0.0	(1.1)	(4.1)
Dividends	$ (40.8)		0.0	(39.8)	0.0	(39.8)	(1.0)
Common shares, outstanding shares (in shares) at Jun. 30, 2017	94,741,356	94,741,356
Balances at Jun. 30, 2017	$ 1,014.8		$ 1,014.5	$ 4.5	$ (3.9)	$ 1,015.1	$ (0.3)

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operations:
Net income including noncontrolling interests	$ 32.9	$ 71.9
Charges (credits) to reconcile net income to cash flows provided from operations:
Net realized and change in unrealized investment gains	(27.3)	(41.3)
Deferred income tax (benefit) expense	(2.6)	19.2
Other operating items:
Net change in loss and LAE reserves	45.6	(13.2)
Net change in unearned premiums	20.1	(3.9)
Net change in ceded unearned premium	(12.4)	(5.0)
Net change in premiums receivable	(17.1)	(19.9)
Net change in reinsurance recoverables on paid and unpaid losses	(18.5)	10.0
Net change in funds held under insurance contracts	57.2	3.2
Net change in other assets and liabilities	8.3	(38.3)
Net cash provided from (used for) operations	86.2	(17.3)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	56.6	(45.4)
Maturities of fixed maturity investments	158.6	229.5
Sales of fixed maturity investments	686.1	200.5
Sales of common equity securities	5.8	174.4
Return of capital and distributions of other investments	13.5	7.0
Purchases of fixed maturity investments	(957.9)	(449.4)
Purchases of common equity securities	(6.2)	(109.5)
Contributions for other investments	(0.9)	(0.4)
Net change in unsettled investment purchases and sales	4.8	42.5
Acquisitions of property and equipment	(4.0)	(2.1)
Net cash (used for) provided from investing activities	(43.6)	47.1
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.8)	(39.6)
Repurchases and retirements of common stock	(1.1)	(11.5)
Payments on capital lease obligation	0.0	(1.0)
Net cash used for financing activities	(40.9)	(52.1)
Net increase (decrease) in cash during period	1.7	(22.3)
Cash balance at beginning of period	69.6	95.2
Cash balance at end of period	$ 71.3	$ 72.9

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Nature of Operations and Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Nature of Operations and Summary of Significant Accounting Policies

NOTE 1. Nature of Operations and Summary of Significant Accounting Policies

Basis of presentation

These interim consolidated financial statements include the accounts of OneBeacon Insurance Group, Ltd. (the "Company" or the "Registrant") and its subsidiaries (collectively, "OneBeacon") and have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). The Company is an exempted Bermuda limited liability company with U.S.-based underwriting operating companies that are property and casualty insurance writers and a Bermuda-based reinsurance company, Split Rock Insurance, Ltd. ("Split Rock"). OneBeacon offers a wide range of specialty insurance products and services primarily through independent agencies, regional and national brokers, wholesalers and managing general agencies.

OneBeacon is 75.7% owned by White Mountains Insurance Group, Ltd. ("White Mountains"), a holding company whose businesses provide property and casualty insurance, reinsurance and certain other products. The Company's headquarters are located at 26 Reid Street, Hamilton HM 11, Bermuda. The Company's U.S. corporate headquarters are located at 605 North Highway 169, Plymouth, Minnesota 55441 and its registered office is located at Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda.

On May 2, 2017, Intact Financial Corporation (“Intact”), which is based in Toronto, Ontario, Canada and is the largest provider of property and casualty insurance in Canada, and the Company announced that they had entered into a definitive merger agreement ("Merger Agreement") which provides for the merger of an indirect subsidiary of Intact with and into the Company, following the satisfaction of various closing conditions, including approval by the Company’s shareholders and approval by applicable insurance regulatory authorities (the “OneBeacon Acquisition”). See Note 2—"OneBeacon Acquisition".

OneBeacon's reportable segments are Specialty Products, Specialty Industries and Investing, Financing and Corporate. The Specialty Products segment is comprised of ten active underwriting operating segments, representing an aggregation based on those that offer distinct products and tailored coverages and services to a broad customer base across the United States. The Specialty Industries segment is comprised of six active underwriting operating segments, representing an aggregation based on those that focus on solving the unique needs of a particular customer or industry group. The Investing, Financing and Corporate segment includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through the Company and its intermediate holding company subsidiaries. See Note 7—"Segment Information" for changes to underwriting operating and reportable segments during the three months ended March 31, 2017. Prior periods have been restated to conform to the current presentation of segment information.

All significant intercompany transactions have been eliminated in consolidation. These interim financial statements include all adjustments considered necessary by management to fairly state the financial position, results of operations and cash flows of OneBeacon. These interim financial statements may not be indicative of financial results for the full year and should be read in conjunction with the Company’s 2016 Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission (the "SEC") on February 27, 2017. The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Refer to the Company’s 2016 Annual Report on Form 10-K for a complete discussion regarding OneBeacon’s significant accounting policies. Certain amounts in the prior period financial statements have been reclassified to conform to the current presentation.

Derivatives

During 2017, OneBeacon began purchasing foreign currency forward contracts in order to provide an economic hedge against fluctuations in certain foreign-denominated fixed maturity securities that were purchased during the same time period. These foreign currency forward contracts are considered derivative financial instruments and they have not been designated or accounted for under hedge accounting. OneBeacon recognizes these derivatives as either assets or liabilities, measured at fair value, in the consolidated balance sheets. Changes in the fair value of derivative instruments, or realized gains and losses from the sale or maturity of the forward contracts, are recognized as components of investment results in current period pre-tax income.

Recently Adopted Changes in Accounting Principles

Stock Compensation

Effective January 1, 2017, OneBeacon adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (ASC 718) which simplifies certain aspects of the accounting for share-based compensation. The new guidance provides an accounting policy election to account for forfeitures by either applying an assumption, as required under existing guidance, or by recognizing forfeitures when they actually occur. At adoption, OneBeacon did not change its accounting policy for forfeitures, which is to apply an assumed forfeiture rate. The new guidance has also changed the threshold for partial cash settlement to settle statutory withholding requirements for equity classified awards, increasing the threshold up to the maximum statutory tax rate.

In addition, the new guidance changed the treatment for excess tax benefits which arise from the difference between the deduction for tax purposes and the compensation costs recognized for financial reporting. Previously, excess tax benefits were recognized through other comprehensive income. Under the new guidance, OneBeacon will recognize excess tax benefits or expense in current period earnings.

Short-Duration Contracts

Effective December 31, 2016, OneBeacon adopted ASU 2015-09, Disclosures about Short Duration Contracts (ASC 944) which requires expanded footnote disclosures about loss and loss adjustment expense ("LAE") reserves. Upon adoption, OneBeacon modified its disclosures in the Company's 2016 Annual Report on Form 10-K to include loss development tables on a disaggregated basis by accident year and a reconciliation of loss development data to the loss and LAE reserves reflected on the balance sheet. The footnote disclosures were also expanded to include information about claim frequency data, including a description of how the claims frequency data is measured. Prior year disclosures were modified to conform to the new disclosures. There was no impact upon adoption to the financial statements contained herein as OneBeacon was already disclosing the new required loss rollforward. See Note 3—"Unpaid Loss and Loss Adjustment Expense (LAE) Reserves".

Recently Issued Accounting Pronouncements

Cash Flow Statement

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (ASC 230), which addresses the classification and presentation of certain items, including debt prepayment and extinguishment costs, contingent consideration payments made after a business combination and distributions received from equity method investees, for which there was diversity in practice.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash (ASC230). Under current guidance, restricted amounts of cash or cash equivalents are excluded from the cash flow statement. The new guidance requires restricted cash and restricted cash equivalents to be included in the reconciliation of beginning and end-of-period amounts presented on the statement of cash flows. In addition, the new guidance requires a description of the nature of the changes in restricted cash and cash equivalents during the periods presented.

The updated guidance in ASU 2016-15 and ASU 2016-18 are both effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. OneBeacon does not expect the adoption of this guidance to have a material impact on its consolidated statement of cash flows.

Credit Losses

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (ASC 326), which establishes new guidance for the recognition of credit losses for financial assets measured at amortized cost. The new ASU, which applies to financial assets that have the contractual right to receive cashrequires reporting entities to estimate the credit losses expected over the life of a credit exposure using historical information, current information, and reasonable and supportable forecasts that affect the collectability of the financial asset. The types of assets included in the scope of the new guidance includes premium receivables, reinsurance recoverables, and loans. ASU 2016-13 is effective for annual periods beginning after January 1, 2020, including interim periods. OneBeacon measures financial assets at fair value with changes therein recognized in current period earnings and accordingly, does not expect adoption to have a significant impact on its financial statements.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (ASC 842). The new guidance requires lessees to recognize lease assets and liabilities on the balance sheet for both operating and financing leases, with the exception of leases with an original term of 12 months or less. Under existing guidance recognition of lease assets and liabilities is not required for operating leases. The lease assets and liabilities to be recognized are both measured initially based on the present value of the lease payments. Under the new guidance, a sale-leaseback transaction must meet the recognition criteria under ASC 606, Revenues in order to be accounted for as a sale. The new guidance is effective for OneBeacon for years beginning after December 15, 2018, including interim periods therein. OneBeacon is evaluating the expected impact of this new guidance and available adoption methods.

Financial Instruments - Recognition and Measurement

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASC 825-10). The new ASU modifies the guidance for financial instruments, including investments in equity securities. Under the new guidance, all equity securities with readily determinable fair values are required to be measured at fair value with changes therein recognized through current period earnings. In addition, the new ASU requires a qualitative assessment for equity securities without readily determinable fair values to identify impairment, and for impaired equity securities to be measured at fair value. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017, with early adoption permitted. OneBeacon measures its portfolio of investment securities at fair value with changes therein recognized through current period earnings accordingly, does not expect the adoption of ASU 2016-01 to have a significant impact on its financial statements.

Stock Compensation

In May 2017, the FASB issued ASU 2017-09, Stock Compensation: Scope of Modification Accounting (ASC 718), which narrows the scope of transactions subject to modification accounting to changes in terms of an award that result in a change in the award's fair value, vesting conditions, or classification. ASU 2017-09 is effective for fiscal years beginning after December 15, 2017. OneBeacon does not expect the adoption of this guidance to have a material impact on its financial statements.

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASC 606), which modifies the guidance for revenue recognition. Under ASU 2014-09, revenue is to be recognized at an amount that reflects the consideration to which an entity expects to be entitled in exchange for goods and services transferred to customers. The new guidance sets forth the steps to be followed to recognize revenue: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the entity satisfies a performance obligation. Subsequently, the FASB issued additional ASUs clarifying the guidance in and providing implementation guidance for ASU 2014-09.In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (ASC 606),which delays the effective date of ASU 2014-09 and all related ASUs to annual and interim periods beginning after December 15, 2017. Most of OneBeacon's revenue from customer relates to insurance contracts, which are excluded from the scope of ASU 2014-09, as are investment income and investment gains and losses. However, the new guidance is applicable to some of OneBeacon's revenue streams, including certain fee arrangements as well as commissions and other non-insurance revenues. OneBeacon is evaluating the new guidance, but does not expect ASU 2014-09 to have a significant effect on recognition of OneBeacon's non-insurance revenues from customers.

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OneBeacon Acquisition

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

OneBeacon Acquisition

NOTE 2. OneBeacon Acquisition

As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies", on May 2, 2017, Intact and the Company announced the OneBeacon Acquisition. The subsidiaries of White Mountains Insurance Group, Ltd. that own the Company's common stock have executed a voting agreement in support of the OneBeacon Acquisition. Under the terms of the Merger Agreement, which has been approved by the board of directors of both companies, the Company’s shareholders will be entitled to receive $18.10 for each outstanding share of the Company’s common stock. Aggregate cash consideration to Company shareholders is anticipated to be approximately $1.7 billion. The OneBeacon Acquisition is expected to be completed in the third quarter or early in the fourth quarter of 2017.

The closing of the OneBeacon Acquisition is subject to the satisfaction of various closing conditions, including the approval by the Company’s shareholders, which occurred on July 18, 2017, as well as the approval of various insurance regulatory authorities and other closing conditions customary for a transaction of this type. Pursuant to the Merger Agreement, the Company is required to carry on its business in the ordinary course consistent with past practice, in all material respects; however, certain actions are restricted or may not be taken without Intact's prior written consent.

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Unpaid Loss and Loss Adjustment Expense (LAE) Reserves

6 Months Ended

Jun. 30, 2017

Insurance Loss Reserves [Abstract]

Unpaid Loss and Loss Adjustment Expense (LAE) Reserves

NOTE 3. Unpaid Loss and Loss Adjustment Expense (LAE) Reserves

Loss and LAE reserve summary

The following table summarizes the loss and LAE reserve activities of OneBeacon's insurance subsidiaries for the three and six months ended June 30, 2017 and 2016:

	Three months ended  June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Gross beginning balance	$	1,368.8		$	1,343.8		$	1,365.6		$	1,389.8
Less beginning reinsurance recoverables on unpaid losses	(174.7		)	(150.4		)	(172.9		)	(186.0		)
Net beginning loss and LAE reserves	1,194.1			1,193.4			1,192.7			1,203.8
Loss and LAE incurred relating to:
Current year losses	181.3			164.3			331.9			323.1
Prior year losses	7.3			15.4			7.3			15.4
Total incurred loss and LAE	188.6			179.7			339.2			338.5
Loss and LAE paid relating to:
Current year losses	(36.4		)	(37.1		)	(57.7		)	(59.1		)
Prior year losses	(132.1		)	(122.2		)	(260.0		)	(269.4		)
Total loss and LAE payments	(168.5		)	(159.3		)	(317.7		)	(328.5		)
Net ending loss and LAE reserves	1,214.2			1,213.8			1,214.2			1,213.8
Plus ending reinsurance recoverables on unpaid losses	197.0			162.8			197.0			162.8
Gross ending loss and LAE reserves	$	1,411.2		$	1,376.6		$	1,411.2		$	1,376.6

Loss and LAE development

Loss and LAE development—2017

During the three months ended June 30,2017, OneBeacon experienced $7.3 million net unfavorable loss and LAE reserve development on prior accident year reserves driven by Programs. The unfavorable development in Programs was driven by increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs.

During the six months ended June 30,2017, OneBeacon experienced $7.3 million net loss and LAE reserve development on prior accident year reserves as unfavorable reserve development, primarily in Healthcare due to an adverse settlement on a single managed care errors and omissions claim, and in Programs driven by increased loss activity, including numerous mid-size losses, across most accounts, including auto-related programs, with the unfavorable development partially offset by favorable reserve development driven in part by Technology and Accident & Health resulting from favorable loss experience.

Loss and LAE development—2016

During both the three and six months ended June 30, 2016, OneBeacon experienced $15.4 million net unfavorable loss and LAE reserve development on prior accident year reserves. During the three months ended June 30, 2016, the Healthcare operating segment recorded $24.0 million of net unfavorable loss reserve development as a result of increasing claim frequency, as well as higher than expected paid and case activity, most notably within the senior living sub-line, which provides medical malpractice and general liability insurance for extended care facilities, including assisted living, memory care and continuing care facilities. As a result of the continuing loss activity experienced in this sub-line, we performed an in-depth claim file review, which confirmed that the increased case incurred loss activity was driven by frequency, especially in the more recent prior accident years, as opposed to other potential considerations such as changes in claims-handling practices. In addition, a thorough actuarial review was completed, including analysis of the results of enhancements made to the predictive model deployed in the senior living sub-line. Adverse financial results were primarily observed in high-risk categories of business and in difficult geographic venues identified by the predictive model data. As a result of these analyses, management increased its best estimate of prior accident year losses during the prior year period, and increased its loss provisions for the current accident year based on the updated actuarial indications. In addition, also within the Healthcare operating segment, there were two large claims within the managed care errors and omissions sub-line related to unexpected outcomes from mediation and extended costs associated with claim defense, which contributed to the unfavorable development in prior accident years. In the six months ended June 30, 2016, Healthcare recorded $34.8 million of adverse prior year development, which included prior year loss activity recorded in the first quarter of 2016 in the complex risk sub-line, which provides professional liability coverage to hospitals, physicians, and physician groups as well as physicians' extended reporting period coverage.

In addition to Healthcare, but to a lesser extent, Programs also experienced unfavorable development during the three months ended June 30,2016 primarily as a result of two larger auto-related programs; the total unfavorable development in Healthcare and Programs, along with a few other businesses, was partially offset by favorable development in Financial Services and several other businesses.

During the six months ended June 30,2016, net unfavorable development was driven by Healthcare. In addition, to a lesser extent, unfavorable development in Programs and a few other businesses, was partially offset by favorable development in Technology, Financial Services and Accident, as well as other businesses.

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Reinsurance

6 Months Ended

Jun. 30, 2017

Reinsurance Disclosures [Abstract]

Reinsurance

NOTE 4. Reinsurance

In the normal course of business, OneBeacon's insurance subsidiaries seek to limit losses that may arise from catastrophes or other events by reinsuring with third-party reinsurers. OneBeacon remains liable for risks reinsured even if the reinsurer does not honor its obligations under reinsurance contracts.

Reinsurance Treaties

The Company's reinsurance coverage is discussed in Note 4—"Reinsurance" in the Company's 2016 Annual Report on Form 10-K. All of the Company's expiring reinsurance treaties were renewed during the three months ended June 30, 2017 with terms that were substantially similar to those reported in the 2016 Annual Report on Form 10-K.

Reinsurance Recoverables

As of June 30, 2017, OneBeacon had reinsurance recoverables on paid losses of $1.0 million and reinsurance recoverables on unpaid losses of $197.0 million. As reinsurance contracts do not relieve OneBeacon of its obligations, collectibility of balances due from reinsurers is important to OneBeacon's financial strength. The following table summarizes A.M. Best Company, Inc. ("A.M. Best") ratings for OneBeacon's reinsurers, excluding industry pools and associations, based upon reinsurance recoverable amounts on paid and unpaid losses and LAE:

	Balance at June 30, 2017		% of total
A.M.Best's Rating(1):	($ in millions)
A+ or better	$	85.9	43	%
A- to A	83.4		42	%
B, Not Rated and Other(2)	28.7		15	%
Total reinsurance recoverables	$	198.0	100	%

_______________________________________________________________________________

⁽¹⁾ A.M. Best's ratings as detailed above are "A+ or better" (Superior), "A- to A" (Excellent) and "B" (Fair).

⁽²⁾ Includes reinsurance recoverable on unpaid losses from Bedivere Insurance Company ("Bedivere"), one of the legal entities transferred as part of the runoff transaction in 2014, of $17.2 million.

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Investment Securities

6 Months Ended

Jun. 30, 2017

Schedule of Investments [Abstract]

Investment Securities

NOTE 5. Investment Securities

OneBeacon's invested assets are comprised of securities and other investments held for general investment purposes. Refer to the Company's 2016 Annual Report on Form 10-K for a complete discussion.

OneBeacon classifies its portfolio of fixed maturity investments, common equity securities, including exchange traded funds ("ETFs"), and other investments held for general investment purposes, as trading securities. Trading securities are reported at fair value as of the balance sheet date as determined by quoted market prices when available. Realized and changes in unrealized investment gains on trading securities are reported, on a pre-tax basis, in revenues as net realized and change in unrealized investment gains.

Short-term investments consist of interest-bearing money market funds and other securities which, at the time of purchase, mature or become available for use within one year. Short-term investments are carried at amortized cost, which approximates fair value.

Other investments consist primarily of surplus notes, hedge funds and private equity funds. Surplus notes provided in conjunction with the financing of the sale of the run-off business in 2014 are measured at estimated fair value based on a discounted expected cash flow model, with changes in fair value reported in total revenues as net realized and change in unrealized investment gains. OneBeacon measures its investments in hedge funds and private equity funds at fair value with changes therein reported in total revenues as net realized and change in unrealized investment gains. Other investments also include an investment in a community reinvestment vehicle which is accounted for at fair value, with changes in fair value reported in total revenues as net realized and change in unrealized investment gains, a tax advantaged federal affordable housing development fund, which is accounted for under the proportional amortization method, and beginning in the first quarter of 2017, a foreign currency forward contract which is accounted for at fair value, with changes in fair value reported in total revenues as net realized and change in unrealized investment gains.

OneBeacon's net investment income is comprised primarily of interest income associated with OneBeacon's fixed maturity investments and short-term investments and dividend income from its common equity securities and other investments.

Net investment income for the three and six months ended June 30, 2017 and 2016 consisted of the following:

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Fixed maturity investments	$	14.1		$	12.2		$	26.7		$	24.3
Short-term investments	0.1			0.1			0.2			0.1
Common equity securities	0.9			0.5			1.7			1.5
Other investments(1)	0.4			0.5			0.4			3.0
Gross investment income	15.5			13.3			29.0			28.9
Less investment expenses	(1.0		)	(1.2		)	(2.3		)	(2.4		)
Net investment income, pre-tax	$	14.5		$	12.1		$	26.7		$	26.5

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⁽¹⁾ Includes an interest payment on the surplus notes of $2.4 million received in the six months ended June 30, 2016.

The composition of net realized investment gains and losses consisted of the following:

	Three months ended  June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Fixed maturity investments	$	0.8		$	0.4		$	(0.3	)	$	(1.0	)
Common equity securities	0.7			3.7			1.0			(1.0		)
Other investments	(1.0		)	(3.0		)	0.2			(2.8		)
Net realized investment gains (losses), pre-tax	$	0.5		$	1.1		$	0.9		$	(4.8	)

The net changes in net unrealized gains for the three and six months ended June 30, 2017 and 2016 are as follows:

	Three months ended June 30, 2017								Six months ended June 30, 2017
($ in millions)	Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in unrealized gains reflected in revenues			Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in fair value reflected in revenues
Fixed maturity investments	$	4.8		$	1.9	$	6.7		$	12.1		$	2.0	$	14.1
Common equity securities	5.2			—		5.2			15.3			—		15.3
Other investments	(0.1		)	—		(0.1		)	(3.0		)	—		(3.0		)
Net change, pre-tax	$	9.9		$	1.9	$	11.8		$	24.4		$	2.0	$	26.4

	Three months ended June 30, 2016								Six months ended June 30, 2016
($ in millions)	Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in unrealized gains reflected in revenues			Changes in net unrealized investment gains		Changes in net foreign currency gains (losses)		Total net changes in fair value reflected in revenues
Fixed maturity investments	$	12.0		$	—	$	12.0		$	27.0	$	—	$	27.0
Common equity securities	(5.4		)	—		(5.4		)	4.3		—		4.3
Other investments	17.0			—		17.0			14.8		—		14.8
Net change, pre-tax	$	23.6		$	—	$	23.6		$	46.1	$	—	$	46.1

The components of OneBeacon's ending net unrealized investment gains and losses, excluding the impact of net unrealized foreign currency translation gains and losses, on its investment portfolio as of June 30, 2017 and December 31, 2016 were as follows:

($ in millions)	June 30, 2017			December 31, 2016
Investment securities:
Gross unrealized investment gains	$	72.2		$	52.7
Gross unrealized investment losses	(7.1		)	(12.0		)
Total net unrealized investment gains, pre-tax	65.1			40.7
Income taxes	(20.4		)	(14.0		)
Total net unrealized investment gains, after-tax	$	44.7		$	26.7

The cost or amortized cost, gross unrealized pre-tax investment gains and losses, net foreign currency gains and losses and carrying values of OneBeacon's fixed maturity investments as of June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
U.S. Government and agency obligations	$	56.0	$	—	$	(0.3	)	$	—	$	55.7
Debt securities issued by corporations	892.7		9.6		(0.7		)	2.0		903.6
Municipal obligations	69.7		1.3		(0.4		)	—		70.6
Mortgage and asset-backed securities	1,238.8		3.7		(2.4		)	—		1,240.1
Foreign government obligations	4.3		0.1		—			—		4.4
Preferred stocks	8.3		5.9		—			—		14.2
Total fixed maturity investments	$	2,269.8	$	20.6	$	(3.8	)	$	2.0	$	2,288.6

	December 31, 2016
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
U.S. Government and agency obligations	$	169.6	$	—	$	(2.3	)	$	—	$	167.3
Debt securities issued by corporations	760.6		6.2		(3.7		)	—		763.1
Municipal obligations	70.1		0.8		(0.4		)	—		70.5
Mortgage and asset-backed securities	1,154.8		1.8		(3.5		)	—		1,153.1
Foreign government obligations	1.0		0.2		—			—		1.2
Preferred stocks	8.3		5.6		—			—		13.9
Total fixed maturity investments	$	2,164.4	$	14.6	$	(9.9	)	$	—	$	2,169.1

The following table summarizes the credit ratings⁽¹⁾ of the debt securities issued by corporations owned by OneBeacon as of June 30, 2017 and December 31, 2016:

	at Fair value
($ in millions)	June 30, 2017		December 31, 2016
AA	$	62.6	$	63.7
A	255.7		169.1
BBB	491.4		450.8
BB	87.0		70.8
B	6.9		8.7
Debt securities issued by corporations	$	903.6	$	763.1

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⁽¹⁾ Credit ratings are assigned based on the following hierarchy: 1) Standard and Poor’s Financial Services LLC (“Standard and Poor’s”) and 2) Moody’s Investor Service (“Moody’s”).

The cost or amortized cost, gross unrealized pre-tax investment gains and losses, net unrealized pre-tax foreign currency gains and losses and carrying values of common equity securities and other investments as of June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
Common equity securities	$	183.8	$	22.5	$	(0.8	)	$	—	$	205.5
Other investments	107.5		29.1		(2.5		)	—		134.1
Total common equity securities and other investments	$	291.3	$	51.6	$	(3.3	)	$	—	$	339.6

	December 31, 2016
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
Common equity securities	$	182.3	$	6.9	$	(0.5	)	$	—	$	188.7
Other investments	120.9		31.2		(1.6		)	—		150.5
Total common equity securities and other investments	$	303.2	$	38.1	$	(2.1	)	$	—	$	339.2

As of June 30, 2017 and December 31, 2016, the Company held unrestricted collateral from its customers, primarily relating to its surety business, of $210.2 million and $153.0 million, respectively, which is included in cash and invested assets. The obligation to return these funds is classified as funds held under insurance contracts in the consolidated balance sheets.

Fair value measurements

Fair value measurements are categorized into a hierarchy that distinguishes between inputs based on market data from independent sources ("observable inputs") and a reporting entity's internal assumptions based upon the best information available when external market data is limited or unavailable ("unobservable inputs"). Quoted prices in active markets for identical assets or liabilities have the highest priority ("Level 1"), followed by observable inputs other than quoted prices, including prices for similar but not identical assets or liabilities ("Level 2") with unobservable inputs, including the reporting entity's estimates of the assumptions that market participants would use, having the lowest priority ("Level 3"). As of both June 30, 2017 and December 31, 2016, approximately 95% of the investment portfolio recorded at fair value was priced based upon observable inputs.

Investments valued using Level 1 inputs include fixed maturity investments, primarily investments in U.S. Treasuries, common equity securities and short-term investments, which include U.S. Treasury Bills. Investments valued using Level 2 inputs are comprised primarily of fixed maturity investments, which have been disaggregated into classes, including debt securities issued by corporations, municipal obligations, mortgage and asset-backed securities, foreign government obligations and preferred stocks. Certain ETFs that track U.S. stock indices such as the S&P 500 but are traded on foreign exchanges are also considered Level 2 measurements, as management values such investments using the fund's published net asset value ("NAV") to account for the difference in market close times. Fair value estimates for investments that trade infrequently and have few or no observable market prices are classified as Level 3 measurements. Level 3 fair value estimates based upon unobservable inputs include OneBeacon's investments in surplus notes and certain fixed maturity investments and common equity securities where quoted market prices are unavailable or are not considered reasonable. OneBeacon determines when transfers between levels have occurred as of the beginning of the period.

OneBeacon uses brokers and outside pricing services to assist in determining fair values. For investments in active markets, OneBeacon uses the quoted market prices provided by outside pricing services to determine fair value. The outside pricing services used by OneBeacon have indicated that if no observable inputs are available for the security, they will not provide a price. In such circumstances, where quoted market prices are unavailable or are not considered reasonable, OneBeacon estimates the fair value using industry standard pricing methodologies and observable inputs such as benchmark yields, reported trades, broker-dealer quotes, issuer spreads, benchmark securities, bids, offers, prepayment speeds, reference data including research publications and other relevant inputs. Given that many fixed maturity investments do not trade on a daily basis, the outside pricing services evaluate a wide range of fixed maturity investments by regularly drawing parallels from recent trades and quotes of comparable securities with similar features. The characteristics used to identify comparable fixed maturity investments vary by asset type and take into account market convention.

OneBeacon's process to assess the reasonableness of the market prices obtained from the outside pricing sources covers substantially all of its fixed maturity investments and includes, but is not limited to, the evaluation of pricing methodologies and a review of the pricing services' quality control processes and procedures on at least an annual basis, comparison of our invested asset market prices to prices obtained from different independent pricing vendors on at least a semi-annual basis, monthly analytical reviews of certain prices and review of the underlying assumptions utilized by our pricing services for selected measurements on an ad hoc basis throughout the year. OneBeacon also performs back-testing of selected sales activity to determine whether there are any significant differences between the market price used to value the security prior to sale and the actual sale price on an ad-hoc basis throughout the year. Prices provided by the pricing services that vary by more than 5% and $1.0 million from the expected price based on these procedures are considered outliers. Also considered outliers are prices that have not changed from period to period and prices that have trended unusually compared to market conditions. In circumstances where the results of OneBeacon's review process do not appear to support the market price provided by the pricing services, OneBeacon challenges the price. If OneBeacon cannot gain satisfactory evidence to support the challenged price, it relies upon its own pricing methodologies to estimate the fair value of the security in question.

The valuation process above is generally applicable to all of OneBeacon’s fixed maturity investments. The techniques and inputs specific to asset classes within OneBeacon's fixed maturity investments for Level 2 securities that use observable inputs are as follows:

Debt securities issued by corporations: The fair value of debt securities issued by corporations is determined from a pricing evaluation technique that uses information from market sources and integrates relative credit information, observed market movements, and sector news. Key inputs include benchmark yields, reported trades, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including sector, coupon, credit quality ratings, duration, credit enhancements, early redemption features and market research publications.

Municipal obligations: The fair value of municipal obligations is determined from a pricing evaluation technique that uses information from market makers, broker-dealers, buy-side firms, and analysts along with general market information. Key inputs include benchmark yields, reported trades, issuer financial statements, material event notices and new issue data, as well as broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including type, coupon, credit quality ratings, duration, credit enhancements, geographic location and market research publications.

Mortgage and asset-backed securities: The fair value of mortgage and asset-backed securities is determined from a pricing evaluation technique that uses information from market sources and leveraging similar securities. Key inputs include benchmark yields, reported trades, underlying tranche cash flow data, collateral performance, plus new issue data, as well as broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including issuer, vintage, loan type, collateral attributes, prepayment speeds, default rates, recovery rates, cash flow stress testing, credit quality ratings and market research publications.

Foreign government obligations: The fair value of foreign government obligations is determined from a pricing evaluation technique that uses feeds from data sources in each respective country, including active market makers and inter-dealer brokers. Key inputs include benchmark yields, reported trades, broker-dealer quotes, two-sided markets, benchmark securities, bids, offers, local exchange prices, foreign exchange rates and reference data including coupon, credit quality ratings, duration and market research publications.

Preferred stocks: The fair value of preferred stocks is determined from a pricing evaluation technique that calculates the appropriate spread over a comparable security for each issue. Key inputs include exchange prices (underlying and common stock of same issuer), benchmark yields, reported trades, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including sector, coupon, credit quality ratings, duration, credit enhancements, early redemption features and market research publications.

Level 3 valuations are generated from techniques that use assumptions not observable in the market. These unobservable assumptions reflect OneBeacon's assumptions that market participants would use in valuing the investment. Generally, certain securities may start out as Level 3 when they are originally issued but as observable inputs become available in the market, they may be reclassified to Level 2.

The fair value of the surplus notes is determined based on a discounted expected cash flow model using information as of the measurement date, and is classified as a Level 3 measurement. OneBeacon’s other investments also include an investment in a community reinvestment vehicle and a foreign currency forward contract, which are accounted for at fair value, and a tax advantaged federal affordable housing development fund, which is accounted for under the proportional amortization method.

The fair values of OneBeacon's investments in hedge funds and private equity funds have been classified as NAV as prescribed by ASU 2015-07. OneBeacon employs a number of procedures to assess the reasonableness of the NAV reported by the fund's manager, including obtaining and reviewing periodic and audited financial statements and discussing each fund’s pricing with the fund manager throughout the year. In the event OneBeacon believes that its estimate of NAV differs from that reported by the fund due to illiquidity or other factors, OneBeacon will adjust the fund's reported NAV to more appropriately represent the fair value of its interest in the investment. As of June 30, 2017 and December 31, 2016, OneBeacon recorded negative adjustments of $1.1 million and $5.0 million, respectively, to the reported NAV of certain investments in hedge funds and private equity funds.

Fair value measurements by level

The following tables summarize the Company's fair value measurements for investments as of June 30, 2017 and December 31, 2016 by level. The major security types were based on the legal form of the securities. OneBeacon has disaggregated its fixed maturity investments based on the issuing entity type, which impacts credit quality, with debt securities issued by U.S. government entities carrying minimal credit risk, while the credit and other risks associated with other issuers, such as corporations, foreign governments, municipalities or entities issuing asset-backed securities vary depending on the nature of the issuing entity type. OneBeacon further disaggregates debt securities issued by corporations and common equity securities by industry sector because investors often reference commonly used benchmarks and their subsectors to monitor risk and performance. Accordingly, OneBeacon has further disaggregated these asset classes into subclasses based on the similar sectors and industry classifications the Company uses to evaluate investment risk and performance against commonly used benchmarks, such as the Bloomberg Barclays U.S. Intermediate Aggregate and S&P 500 indices.

($ in millions)	Fair value at June 30, 2017		Level 1		Level 2		Level 3
Fixed maturity investments:
U.S. Government and agency obligations	$	55.7	$	55.7	$	—	$	—
Debt securities issued by corporations:
Consumer	187.3		—		187.3		—
Financials	154.9		—		154.9		—
Industrial	141.6		—		140.0		1.6
Health Care	122.3		—		122.3		—
Utilities	81.9		—		81.9		—
Technology	63.8		—		63.8		—
Communications	58.4		—		58.4		—
Basic materials	51.4		—		51.4		—
Energy	42.0		—		42.0		—
Debt securities issued by corporations	903.6		—		902.0		1.6
Municipal obligations	70.6		—		70.6		—
Mortgage and asset-backed securities	1,240.1		—		1,227.4		12.7
Foreign government obligations	4.4		0.6		3.8		—
Preferred stocks	14.2		—		14.2		—
Fixed maturity investments	2,288.6		56.3		2,218.0		14.3
Short-term investments	55.5		55.5		—		—
Common equity securities:
Exchange traded funds(1)	177.9		152.4		25.5		—
Health Care	6.2		6.2		—		—
Financials	5.4		5.4		—		—
Consumer	4.8		4.8		—		—
Communications	3.3		3.3		—		—
Technology	3.3		3.3		—		—
Industrial	3.3		3.3		—		—
Energy	1.3		1.3		—		—
Common equity securities	205.5		180.0		25.5		—
Other investments(2)(3)	84.7		—		—		84.7
Total(1)(2)(3)	$	2,634.3	$	291.8	$	2,243.5	$	99.0

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⁽¹⁾ ETFs traded on foreign exchanges are priced using the fund's published NAV to account for the difference in market close times and are therefore designated as level 2 measurements.

⁽²⁾  Excludes the carrying value of $11.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method and ($2.5) million related to foreign currency forward contracts.

⁽³⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds of $40.6 million for which NAV is generally the practical expedient are no longer classified within the fair value hierarchy.

($ in millions)	Fair value at December 31, 2016		Level 1		Level 2		Level 3
Fixed maturity investments:
U.S. Government and agency obligations	$	167.3	$	167.3	$	—	$	—
Debt securities issued by corporations:
Consumer	194.8		—		194.8		—
Healthcare	129.2		—		129.2		—
Industrial	118.2		—		118.2		—
Financials	96.3		—		96.3		—
Communications	59.4		—		59.4		—
Energy	47.4		—		47.4		—
Technology	40.7		—		40.7		—
Utilities	39.5		—		39.5		—
Basic materials	37.6		—		37.6		—
Debt securities issued by corporations	763.1		—		763.1		—
Municipal obligations	70.5		—		70.5		—
Mortgage and asset-backed securities	1,153.1		—		1,153.1		—
Foreign government obligations	1.2		0.6		0.6		—
Preferred stocks	13.9		—		13.9		—
Fixed maturity investments	2,169.1		167.9		2,001.2		—
Short-term investments	112.1		112.1		—		—
Common equity securities:
Exchange traded funds(1)	164.4		140.9		23.5		—
Healthcare	7.0		7.0		—		—
Consumer	4.3		4.3		—		—
Financials	3.9		3.9		—		—
Technology	3.7		3.7		—		—
Communications	3.5		3.5		—		—
Energy	1.2		1.2		—		—
Industrial	0.7		0.7		—		—
Common equity securities	188.7		165.2		23.5		—
Other investments(2)(3)	86.2		—		—		86.2
Total(1)(2)(3)	$	2,556.1	$	445.2	$	2,024.7	$	86.2

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⁽¹⁾ ETFs traded on foreign exchanges are priced using the fund's published NAV to account for the difference in market close times and are therefore designated as level 2 measurements.

⁽²⁾  Excludes the carrying value of $12.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method.

⁽³⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds of $52.0 million for which NAV is generally the practical expedient are no longer classified within the fair value hierarchy.

Rollforwards of Fair Value Measurements by Level

The following tables summarize the changes in OneBeacon’s fair value measurements by level for the three and six months ended June 30, 2017 and 2016:

							Level 3 Investments
($ in millions)	Level 1 Investments			Level 2 Investments			Fixed maturity investments			Other investments(1)			NAV investments(2)			Total(1)(2)(3)
Balance at January 1, 2017	$	333.1		$	2,024.7		$	—		$	86.2		$	52.0		$	2,496.0
Amortization/accretion	—			(4.1		)	—			—			—			(4.1		)
Net realized and unrealized gains	9.4			7.2			0.1			(2.1		)	0.6			15.2
Purchases	9.3			539.4			47.1			—			0.8			596.6
Sales	(121.4		)	(479.2		)	—			—			(13.2		)	(613.8		)
Transfers in	—			—			—			—			—			—
Transfers out	—			—			—			—			—			—
Balance at March 31, 2017	$	230.4		$	2,088.0		$	47.2		$	84.1		$	40.2		$	2,489.9
Amortization/accretion	—			(3.4		)	—			—			—			(3.4		)
Net realized and unrealized gains	5.1			8.3			—			0.6			0.6			14.6
Purchases	5.4			348.7			14.3			—			0.1			368.5
Sales	(4.6		)	(245.3		)	—			—			(0.3		)	(250.2		)
Transfers in	—			47.2			—			—			—			47.2
Transfers out	—			—			(47.2		)	—			—			(47.2		)
Balance at June 30, 2017	$	236.3		$	2,243.5		$	14.3		$	84.7		$	40.6		$	2,619.4

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⁽¹⁾  Excludes the carrying value of $11.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method and $(2.5) million related to foreign currency forward contracts as of June 30, 2017.

⁽²⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds measured generally using the NAV practical expedient are no longer classified within the fair value hierarchy.

⁽³⁾  Excludes short-term investments.

							Level 3 Investments
($ in millions)	Level 1 Investments			Level 2 Investments			Fixed maturity investments		Other investments(1)		NAV investments(2)			Total(1)(2)(3)
Balance at January 1, 2016	$	363.3		$	1,945.9		$	70.0	$	65.8	62.5			$	2,507.5
Amortization/accretion	—			(3.2		)	—		—		—			(3.2		)
Net realized and unrealized gains	5.6			12.5			0.5		0.4		(2.4		)	16.6
Purchases	98.2			187.0			—		—		0.4			285.6
Sales	(158.4		)	(216.8		)	—		—		(3.0		)	(378.2		)
Transfers in	—			—			—		—		—			—
Transfers out	—			—			—		—		—			—
Balance at March 31, 2016	$	308.7		$	1,925.4		$	70.5	$	66.2	$	57.5		$	2,428.3
Amortization/accretion	—			(2.9		)	—		—		—			(2.9		)
Net realized and unrealized gains	(2.1		)	12.1			0.7		10.9		3.1			24.7
Purchases	38.5			221.2			13.9		—		0.2			273.8
Sales	(75.5		)	(153.6		)	—		—		(4.1		)	(233.2		)
Transfers in	—			—			—		—		—			—
Transfers out	—			—			—		—		—			—
Balance at June 30, 2016	$	269.6		$	2,002.2		$	85.1	$	77.1	$	56.7		$	2,490.7

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⁽¹⁾  Excludes the carrying value of $13.4 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method as of June 30, 2016.

⁽²⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds generally measured using the NAV practical expedient are no longer classified within the fair value hierarchy.

⁽³⁾  Excludes short-term investments.

There were no “Transfers in” to Level 3 investments for the six months ended June 30, 2017 and 2016. “Transfers out” of Level 3 investments for the six months ended June 30, 2017 were comprised of $47.2 million in residential mortgage backed securities, which were recategorized as Level 2 measurements when quoted market prices for similar securities that were considered reliable and could be validated against an alternative source became available. There were no "Transfers out" of Level 3 investments for the six months ended June 30, 2016.

The following table summarizes the change in net pre-tax unrealized gains or losses for assets designated as Level 3 for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,				Six months ended June 30,
($ in millions)	2017		2016		2017			2016
Fixed maturity investments	$	—	$	0.7	$	0.1		$	1.2
Other investments	0.6		10.9		(1.5		)	11.3
Total	$	0.6	$	11.6	$	(1.4	)	$	12.5

Significant Unobservable Inputs

As previously described, in certain circumstances, OneBeacon estimates the fair value of investments using industry standard pricing methodologies and both observable and unobservable inputs. The following summarizes significant unobservable inputs used in estimating the fair value of fixed maturity and other investments classified within Level 3, as of June 30, 2017 and December 31, 2016.

($ in millions)	As of June 30, 2017
Description	Fair Value		Rating(1)	Valuation Technique	Unobservable Inputs	Input
Surplus notes:
- Seller priority note	$	48.9	N/R	Discounted cash flow	Discount rate(2)	10.6%
					Timing of interest payments(3)	2020
					Timing of principal payments(3)	2030
- Pari passu note	$	21.6	N/R	Discounted cash flow	Discount rate(4)	15.2%
					Timing of interest payments(5)	2021
					Timing of principal payments(5)	2035
Non-agency residential mortgage-backed securities	$	7.7	AAA	Broker pricing	Broker quote (6)	$	102.0
Non-agency commercial mortgage-backed securities	$	5.0	A-	Broker pricing	Broker quote (6)	$	100.0
Debt securities issued by corporations	$	1.6	BBB	Broker pricing	Broker quote (6)	$	127.5
Community reinvestment vehicle	$	14.2	N/R	Member share of GAAP net equity	GAAP net equity	$	14.2

($ in millions)	As of December 31, 2016
Description	Fair Value		Rating(1)	Valuation Technique	Unobservable Inputs	Input
Surplus notes:
- Seller priority note	$	51.1	N/R	Discounted cash flow	Discount rate(2)	9.6%
					Timing of interest payments(3)	2020
					Timing of principal payments(3)	2030
- Pari passu note	$	20.8	N/R	Discounted cash flow	Discount rate(4)	15.0%
					Timing of interest payments(5)	2021
					Timing of principal payments(5)	2035
Community reinvestment vehicle	$	14.3	N/R	Member share of GAAP net equity	GAAP net equity	$	14.3

_________________________________________________________________________

⁽¹⁾  Credit ratings, if rated, are assigned based on the following hierarchy: 1) Standard & Poor's and 2) Moody's

⁽²⁾  Stochastic modeling supporting the fair value estimation indicates that the average percentage of discounted payments missed on the seller priority note is roughly equivalent to that of a conventional debt security with a credit rating of ‘B’. The corresponding credit spread, increased by an additional 400 bps and 250 bps as of June 30, 2017 and December 31, 2016, respectively, to reflect both a liquidity discount for a private debt instrument and regulatory payment approval uncertainty, was added to the treasury rate to determine the discount rate for the seller priority note.

⁽³⁾  As of June 30, 2017 and December 31, 2016, the Company has assumed for the purpose of estimating fair value that all accrued but unpaid interest on the seller priority note since the date of issuance is paid in 2020, with regular annual interest payments beginning thereafter. Principal repayments are assumed to begin on a graduated basis in 2030.

⁽⁴⁾  Stochastic modeling supporting the fair value estimation indicates that the average percentage of discounted payments missed on the pari passu note is roughly equivalent to that of a conventional debt security with a credit rating of ‘CCC’. The corresponding credit spread, increased by an additional 400 bps and 250 bps as of June 30, 2017 and December 31, 2016, respectively, to reflect both a liquidity discount for a private debt instrument and regulatory payment approval uncertainty, was added to the treasury rate to determine the discount rate for the seller priority note.

⁽⁵⁾  As of June 30, 2017 and December 31, 2016, the company has assumed for the purpose of estimating fair value that regular annual interest payments on the pari passu note begin in 2021. All accrued but unpaid interest since the date of issuance is assumed to be paid in 2025. Principal repayments are assumed to begin on a graduated basis in 2035.

⁽⁶⁾ As of June 30, 2017, asset type consists of one security.

Mortgage and Asset-backed Securities

OneBeacon purchases commercial mortgage-backed securities ("CMBS") and residential mortgage-backed securities ("RMBS") to maximize its risk adjusted returns in the context of a diversified portfolio. OneBeacon's non-agency CMBS are generally short tenor and structurally senior, with approximately 30 points of subordination on average for fixed rate and floating rate CMBS as of June 30, 2017. In general, subordination represents the percentage of principal loss on the underlying collateral that would have to occur before the security incurs a loss. These collateral losses, instead, are first absorbed by other securities lower in the capital structure. OneBeacon believes this structural protection mitigates the risk of loss tied to refinancing challenges facing the commercial real estate market. As of June 30, 2017, none of the underlying loans of the agency and non-agency CMBS were reported as non-performing.

OneBeacon's non-agency RMBS portfolio is generally of moderate average life, fixed rate, and structurally senior. OneBeacon considers sub-prime mortgage-backed securities to be those that have underlying loan pools that exhibit weak credit characteristics or are issued from dedicated sub-prime shelves or dedicated second-lien shelf registrations (i.e., OneBeacon considers investments backed primarily by second-liens to be sub-prime risks regardless of credit scores or other metrics). OneBeacon did not hold any RMBS categorized as sub-prime as of June 30, 2017.

There are also mortgage-backed securities that OneBeacon categorizes as "non-prime" (also called "Alt A" or "A-") that are backed by collateral that has overall credit quality between prime and sub-prime, as determined based on OneBeacon's review of the characteristics of their underlying mortgage loan pools, such as credit scores and financial ratios. As of June 30, 2017, OneBeacon did not hold any mortgage-backed securities classified as non-prime. OneBeacon's non-agency RMBS portfolio is generally of moderate average life, fixed rate and structurally senior. OneBeacon does not own any collateralized debt obligations, with the exception of $23.3 million of non-agency RMBS resecuritization tranches, each a senior tranche in its own right and each collateralized by a single earlier vintage Super Senior or Senior non-agency RMBS.

The following table summarizes the carrying value of OneBeacon's mortgage and asset-backed securities as of June 30, 2017 and December 31, 2016:

	June 30, 2017						December 31, 2016
($ in millions)	Fair Value		Level 2		Level 3		Fair Value		Level 2		Level 3
Mortgage-backed securities:
Agency:
GNMA	$	170.7	$	170.7	$	—	$	213.5	$	213.5	$	—
FNMA	45.7		45.7		—		42.8		42.8		—
FHLMC	22.3		22.3		—		30.3		30.3		—
Total agency(1)	238.7		238.7		—		286.6		286.6		—
Non-agency:
Residential	218.5		210.8		7.7		135.0		135.0		—
Commercial	145.8		140.8		5.0		123.6		123.6		—
Total Non-agency	364.3		351.6		12.7		258.6		258.6		—
Total mortgage-backed securities	603.0		590.3		12.7		545.2		545.2		—
Other asset-backed securities:
Vehicle receivables	216.8		216.8		—		273.6		273.6		—
Credit card receivables	266.3		266.3		—		224.3		224.3		—
Other	154.0		154.0		—		110.0		110.0		—
Total other asset-backed securities	637.1		637.1		—		607.9		607.9		—
Total mortgage and asset-backed securities	$	1,240.1	$	1,227.4	$	12.7	$	1,153.1	$	1,153.1	$	—

_______________________________________________________________________________

⁽¹⁾ Represents publicly traded mortgage-backed securities which carry the full faith and credit guarantee of the U.S. government (i.e., GNMA) or are guaranteed by a government sponsored entity (i.e., FNMA, FHLMC).

Non-agency Mortgage-backed Securities

The security issuance years of OneBeacon's investments in non-agency RMBS and non-agency CMBS securities as of June 30, 2017 are as follows:

	Fair Value		Security Issuance Year
($ in millions)			2004		2005		2006		2008		2010		2011		2012		2013		2014		2015		2016		2017
Total non-agency RMBS	$	218.5	$	16.8	$	5.0	$	2.5	$	2.3	$	4.7	$	7.7	$	3.5	$	17.4	$	24.9	$	50.0	$	31.0	$	52.7
Total non-agency CMBS	145.8		—		—		—		—		3.8		—		18.1		11.5		23.5		43.8		21.2		23.9
Total non-agency	$	364.3	$	16.8	$	5.0	$	2.5	$	2.3	$	8.5	$	7.7	$	21.6	$	28.9	$	48.4	$	93.8	$	52.2	$	76.6

Non-agency Residential Mortgage-backed Securities

The classification of the underlying collateral quality and the tranche levels of OneBeacon's non-agency RMBS securities are as follows as of June 30, 2017:

($ in millions)	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
Prime	$	218.5	$	46.2	$	172.3	$	—
Total non-agency RMBS	$	218.5	$	46.2	$	172.3	$	—

_______________________________________________________________________________

⁽¹⁾ At issuance, Super Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch Ratings ("Fitch") and were senior to other AAA or Aaa securities.

⁽²⁾ At issuance, Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were senior to non-AAA or non-Aaa securities.

⁽³⁾ At issuance, Subordinate were not rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were junior to other AAA or Aaa securities.

Non-agency Commercial Mortgage-backed Securities

The amount of fixed and floating rate securities and their tranche levels of OneBeacon's non-agency CMBS securities are as follows as of June 30, 2017:

($ in millions)	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
Fixed rate CMBS	$	126.4	$	1.6	$	83.0	$	41.8
Floating rate CMBS	19.4		—		—		19.4
Total non-agency CMBS	$	145.8	$	1.6	$	83.0	$	61.2

_______________________________________________________________________________

⁽¹⁾ At issuance, Super Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's or AAA by Fitch and were senior to other AAA or Aaa securities.

⁽²⁾ At issuance, Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were senior to non-AAA or non-Aaa securities.

⁽³⁾ At issuance, Subordinate were not rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were junior to other AAA or Aaa securities.

Other Investments

As of both June 30, 2017 and December 31, 2016, other investments reported at fair value represented approximately 5% of the total investment portfolio and consisted of the following:

($ in millions)	June 30, 2017			December 31, 2016
Hedge funds(1)	$	18.2		$	18.4
Private equity funds(2)	22.4			33.6
Total hedge funds and private equity funds	40.6			52.0
Surplus notes (par value $101.0)(3)	70.5			71.9
Investment in community reinvestment vehicle	14.2			14.3
Foreign currency forward contract	(2.5		)	—
Total other investments(4)	$	122.8		$	138.2

_______________________________________________________________________________

⁽¹⁾  Consists of 4 hedge funds as of both June 30, 2017 and December 31, 2016.

⁽²⁾  Consists of 14 and 17 private equity funds as of June 30, 2017 and December 31, 2016, respectively.

⁽³⁾  The decrease in fair value of the surplus notes during the six months ended June 30, 2017 was driven primarily by an increase in the assumed liquidity spread, partially offset by the narrowing of non-investment grade credit spreads as well as the time value of money benefit generated by moving six months closer to modeled cash receipts.

⁽⁴⁾  Excludes the carrying value of $11.3 million and $12.3 million as of June 30, 2017 and December 31, 2016, respectively, associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method.

The largest investment in a single hedge fund or private equity fund was $16.1 million and $15.0 million as of June 30, 2017 and December 31, 2016, respectively.

Surplus Notes

In the fourth quarter of 2014, in conjunction with the Runoff Transaction, OneBeacon provided financing in the form of surplus notes, which had a fair value of $70.5 million and $71.9 million as of June 30, 2017 and December 31, 2016, respectively. The surplus notes, issued by one of the transferred entities, Bedivere Insurance Company (“Bedivere" or "Issuer”), were in the form of both seller priority and pari passu notes.

The internal valuation model used to estimate the fair value of the surplus notes is based on discounted expected cash flows using information as of the measurement date. The estimated fair value of the surplus notes is sensitive to changes in public debt credit spreads, as well as changes in estimates with respect to other variables including a discount to reflect the private nature of the notes (and the related lack of liquidity), the credit quality of the notes, based on the financial performance of the Issuer relative to expectations, and the timing, amount, and likelihood of interest and principal payments on the notes, which are subject to regulatory approval and therefore may vary from the contractual terms. For the purposes of estimating fair value, the Company has assumed that all accrued but unpaid interest on the seller priority note since the date of issuance is paid in 2020, with regular annual interest payments on both the seller priority note and the pari passu note beginning in 2021, all accrued but unpaid interest on the pari passu note since the date of issuance is paid in 2025 and principal repayments begin on a graduated basis in 2030 for the seller priority note and 2035 for the pari passu note. Although these variables involve considerable judgment, the Company does not currently expect any resulting changes in the estimated value of the surplus notes to be material to its financial position. An interest payment of $2.4 million was received in the six months ended June 30, 2016.

Below is a table illustrating the valuation adjustments taken to arrive at estimated fair value of the surplus notes as of June 30, 2017 and December 31, 2016:

	Type of Surplus Note						Total as of June 30, 2017
	Seller Priority			Pari Passu
	(in millions)
Par value	$	57.9		$	43.1		$	101.0
Fair value adjustments to reflect:
Current market rates on public debt and contract-based repayments(1)	7.9			2.1			10.0
Regulatory approval(2)	2.7			(13.7		)	(11.0		)
Liquidity adjustment(3)	(19.6		)	(9.9		)	(29.5		)
Total	(9.0		)	(21.5		)	(30.5		)
Fair value(4)	$	48.9		$	21.6		$	70.5

	Type of Surplus Note						Total as of December 31, 2016
	Seller Priority			Pari Passu
	(in millions)
Par value	$	57.9		$	43.1		$	101.0
Fair value adjustments to reflect:
Current market rates on public debt and contract-based repayments(1)	6.2			(1.1		)	5.1
Regulatory approval(2)	(0.2		)	(15.4		)	(15.6		)
Liquidity adjustment(3)	(12.8		)	(5.8		)	(18.6		)
Total	(6.8		)	(22.3		)	(29.1		)
Fair value	$	51.1		$	20.8		$	71.9

_______________________________________________________________________________

⁽¹⁾  Represents the value of the surplus notes, at current market yields on comparable publicly traded debt, and assuming issuer is allowed to make principal and interest payments when its financial capacity is available, as measured by statutory capital in excess of a 250% RBC score under the National Association of Insurance Commissioners’ risk-based capital standards for property and casualty companies. The favorable year-to-date change in impact is due principally to the narrowing of non-investment grade credit spreads as well as the time value of money benefit from moving three months closer to modeled cash receipts.

⁽²⁾  Represents anticipated delay in securing regulatory approvals of interest and principal payments to reflect graduated changes in Issuer's statutory surplus. The monetary impact of the anticipated delay is measured based on credit spreads of public securities with roughly equivalent percentages of discounted payments missed. The favorable year-to-date change in impact is driven primarily by the narrowing of non-investment grade credit spreads, which causes the anticipated delay in securing regulatory approval to be less punitive.

⁽³⁾  Represents impact of liquidity spread to account for OneBeacon's sole ownership of the notes, lack of a trading market, and unique nature of the ongoing regulatory approval process. The unfavorable year-to-date change in impact is due largely to an increase in the assumed liquidity spread to 400 basis points at June 30, 2017 from 250 basis points at December 31, 2016.

⁽⁴⁾  The decrease in fair value of the surplus notes during the six months ended June 30, 2017 was driven primarily by an increase in the assumed liquidity spread, partially offset by the narrowing of non-investment grade credit spreads as well as the time value of money benefit generated by moving six months closer to modeled cash receipts.

Hedge Funds and Private Equity Funds

OneBeacon holds investments in hedge funds and private equity funds which are included in other investments. The fair value of these investments has generally been estimated using the net asset value of the funds. The following table summarizes investments in hedge funds and private equity funds as of June 30, 2017 and December 31, 2016:

	June 30, 2017				December 31, 2016
($ in millions)	Fair Value		Unfunded Commitments		Fair Value		Unfunded Commitments
Hedge funds
Long/short equity banks and financials	$	16.1	$	—	$	15.0	$	—
Other	2.1		—		3.4		—
Total hedge funds	18.2		—		18.4		—
Private equity funds
Multi-sector	11.0		2.0		11.5		2.0
Healthcare	3.4		0.4		3.5		0.4
Energy infrastructure and services	3.2		3.0		14.1		3.2
Private equity secondaries	2.4		2.1		3.0		2.1
Direct lending / mezzanine debt	1.3		6.2		0.4		7.1
Insurance	0.9		0.1		0.8		0.1
Real estate	0.2		0.1		0.3		0.1
Total private equity funds	22.4		13.9		33.6		15.0
Total hedge funds and private equity funds	$	40.6	$	13.9	$	52.0	$	15.0

Redemptions of investments in certain hedge funds are subject to restrictions including "lock-up" periods where no redemptions or withdrawals are allowed, restrictions on redemption frequency and advance notice periods for redemptions. Amounts requested for redemptions remain subject to market fluctuations until the redemption effective date, which generally falls at the end of the defined redemption period. As of June 30, 2017, none of OneBeacon's hedge funds were subject to lock-up. The following summarizes the June 30, 2017 fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds:

	Hedge Funds Notice Period
($ in millions)	30 - 59 days notice		60 - 89 days notice		90 - 119 days notice		120+ days notice		Total
Redemption frequency
Monthly	$	—	$	—	$	—	$	—	$	—
Quarterly	16.1		—		—		—		16.1
Annual	—		—		2.1		—		2.1
Total hedge funds	$	16.1	$	—	$	2.1	$	—	$	18.2

Certain hedge fund investments are no longer active and are in the process of disposing of their underlying investments. Distributions from such funds are remitted to investors as the fund's underlying investments are liquidated. As of June 30, 2017, OneBeacon's hedge funds in liquidation had a fair value of zero. The actual amount of the final distribution is subject to market fluctuations. The date at which such distributions, if any, will be received is not determinable as of June 30, 2017.

OneBeacon has also submitted redemption requests for certain of its investments in active hedge funds. As of June 30, 2017, redemptions of $2.1 million were outstanding and remain subject to market fluctuations. The date at which such redemptions will be received is not determinable at June 30, 2017. Redemptions are recorded as receivables when the investment is no longer subject to market fluctuations.

Investments in private equity funds are generally subject to lock-up periods during which investors may not request a redemption. Distributions prior to the expected termination date of the fund may be limited to dividends or proceeds arising from the liquidation of the fund's underlying investment. In addition, certain private equity funds provide an option to extend the lock-up period at either the sole discretion of the fund manager or upon agreement between the fund and the investors. As of June 30, 2017, investments in private equity funds were subject to lock-up periods as follows:

($ in millions)	1 - 3 years		3 - 5 years		5 - 10 years		>10 years		Total
Private Equity Funds—expected lock-up period remaining	$	18.7	$	2.4	$	—	$	1.3	$	22.4

Foreign Currency Forward Contracts

During the first quarter of 2017, OneBeacon established a portfolio of investment grade fixed maturity investments denominated in British Pound Sterling ("GBP"). As part of managing exposure to foreign currency risk within that portfolio, the Company entered into a foreign currency forward contract with notional amounts of $62.6 million (GBP 50.0 million) as of June 30, 2017. The contract does not meet the criteria to be accounted for as a hedge.

As of June 30, 2017, the fair value of the foreign currency forward contracts, as estimated using OTC quotes for similar instruments, which are classified as Level 2 measurements with the fair value hierarchy, was negative $2.5 million, and was included in other investments. During the three and six months ended June 30, 2017, change in fair value of negative $2.3 million and negative $2.5 million, respectively, was included in net realized and change in unrealized investment gains, with no such amount included for the three and six months ended June 30, 2016. The Company's derivative transactions are documented under an International Swaps and Derivatives Association ("ISDA") agreement and are subject to a master netting agreement. In conjunction with the ISDA agreement, no collateral is either pledged or received related to this contract. The following table summarizes the notional amount and uncollaterized balance as of June 30, 2017:

($ in millions)	Notional Amount		Carrying Value			Standard & Poor's Rating
Counterparty
Barclays Bank PLC	$	62.6	$	(2.5	)	A-

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Debt

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Debt

NOTE 6. Debt

OneBeacon's debt outstanding as of June 30, 2017 and December 31, 2016 consisted of the following:

($ in millions)	June 30, 2017			December 31, 2016
Senior unsecured notes, at face value	$	275.0		$	275.0
Unamortized original issue discount	(0.2		)	(0.2		)
Unamortized issuance costs	(1.5		)	(1.6		)
Senior unsecured notes, carrying value	$	273.3		$	273.2

2012 Senior Notes

In November 2012, OneBeacon U.S. Holdings, Inc. ("OBH") issued $275.0 million face value of senior unsecured notes ("2012 Senior Notes") through a public offering, at an issue price of 99.9% and received $272.9 million of proceeds. The 2012 Senior Notes bear an annual interest rate of 4.6% payable semi-annually in arrears on May 9 and November 9, until maturity on November 9, 2022, and are fully and unconditionally guaranteed as to the payment of principal and interest by the Company. Taking into effect the amortization of the original issue discount and all underwriting and issuance expenses, the 2012 Senior Notes have an effective yield to maturity of approximately 4.7% per annum.

Credit Facility

On September 29, 2015, the Company and OBH, as co-borrowers and co-guarantors, entered into a revolving credit facility administered by U.S. Bank N.A. and also including BMO Harris Bank N.A., which has a total commitment of $65.0 million and has a maturity date of September 29, 2019 (the "Credit Facility"). As of June 30, 2017, the Credit Facility was undrawn.

Debt Covenants

The 2012 Senior Notes were issued under indentures that contain restrictive covenants which, among other things, limit the ability of the Company, OBH, and their respective subsidiaries to create liens and enter into sale and leaseback transactions and limits the ability of the Company and OBH to consolidate, merge or transfer its properties and assets. The indentures do not contain any financial ratios or specified levels of net worth or liquidity to which the Company or OBH must adhere. In addition, a failure by the Company or OBH or their respective subsidiaries to pay principal and interest on covered debt, where such failure results in the acceleration of at least $75.0 million of the principal amount of covered debt, could trigger the acceleration of the 2012 Senior Notes.

The Credit Facility contains various affirmative, negative and financial covenants which OneBeacon considers to be customary for such borrowings, including certain minimum net worth and maximum debt to capitalization standards. These covenants can restrict the Company, OBH and their respective subsidiaries in several ways, including their ability to incur additional indebtedness. An uncured breach of these covenants could result in an event of default under the Credit Facility, which would allow lenders to declare any amounts owed under the Credit Facility to be immediately due and payable.

As of June 30, 2017, OneBeacon was in compliance with all of the covenants under the 2012 Senior Notes and the Credit Facility. The closing of the OneBeacon Acquisition will not result in any default under the indenture for the 2012 Senior Notes. While the closing of the OneBeacon Acquisition would constitute an event of default under the Credit Facility, OneBeacon intends to voluntarily terminate the Credit Facility, which is undrawn, effective as of the closing.

XML

Segment Information

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Information

NOTE 7. Segment Information

The Company has sixteen active underwriting operating segments, which are managed by the Chief Operating Decision Maker ("CODM") and are aggregated into two underwriting reportable segments, Specialty Products and Specialty Industries. In addition, the Investing, Financing and Corporate reportable segment includes the investing and financing activities for OneBeacon on a consolidated basis, and certain other activities conducted through the Company and its intermediate holding company subsidiaries.

Invested assets are not allocated to the Specialty Products and Specialty Industries segments since OneBeacon does not manage them by segment. Invested assets, net investment income and net realized and change in unrealized investment gains related to OneBeacon's Specialty Products and Specialty Industries segments are included in the Investing, Financing and Corporate segment since these assets are available for payment of losses and expenses for all segments. Debt and related interest expense also are not allocated to or managed by segment and are also included in the Investing, Financing and Corporate segment.

During the three months ended March 31, 2017, the Company completed its transition to reflect certain management changes and a re-segmenting of various business lines within underwriting operating segments. As part of the transition, the Company's executive management, including the CODM, began receiving a new CODM package which reflected an adjusted aggregation of the underwriting operating segments among the existing underwriting reportable segments. The new underwriting operating segments are also consistent with how the Company began externally branding the related insurance products during the three months ended March 31, 2017. The following represents a summary of the changes made:

Media liability: The media liability line, which was previously included in the Other Professional Lines underwriting operating segment within Specialty Products, was moved into the Entertainment underwriting operating segment within Specialty Industries.

Medical excess:The medical excess line, which was previously included in the Healthcare underwriting operating segment within Specialty Products, was moved into the Accident underwriting operating segment which, in turn, has been renamed "Accident and Health" within Specialty Industries.

Architects and Engineers:The Architects and Engineers line, which was previously included in the Other Professional Lines underwriting operating segment within Specialty Products, has been separately broken out such that it is now a separate underwriting operating segment.

Other Professional Lines:The Other Professional Lines former underwriting operating segment is no longer considered an underwriting operating segment.

Other than these changes, there have been no material changes to the Company's determination of reportable segments from that reported in the 2016 Annual Report on Form 10-K.

The Specialty Products segment now includes Healthcare, Tuition Reimbursement, Programs, Surety, Management Liability, Financial Services, Architects and Engineers, Specialty Property, Environmental, and Financial Institutions underwriting operating segments. The Specialty Industries segment includes the Accident and Health, Technology, Ocean Marine, Government Risks, Entertainment, and Inland Marine underwriting operating segments

Prior periods have been restated to conform to the current presentation of segment information. Substantially all of the Company's revenue is generated from customers located in the United States.

Financial information for OneBeacon's reportable segments is as follows:

	Insurance Operations						Investing, Financing and Corporate
($ in millions)	Specialty Products			Specialty Industries						Consolidated
Three months ended June 30, 2017
Earned premiums	$	130.4		$	147.0		$	—		$	277.4
Loss and loss adjustment expense	(98.6		)	(90.0		)	—			(188.6		)
Policy acquisition expenses	(22.0		)	(26.4		)	—			(48.4		)
Other underwriting expenses	(24.8		)	(34.8		)	—			(59.6		)
Total underwriting loss	(15.0		)	(4.2		)	—			(19.2		)
Net investment income	—			—			14.5			14.5
Net realized and change in unrealized investment gains	—			—			12.3			12.3
Net other revenues	—			0.2			1.9			2.1
General and administrative expenses	—			(0.5		)	(8.3		)	(8.8		)
Interest expense	—			—			(3.3		)	(3.3		)
Pre-tax income (loss)	$	(15.0	)	$	(4.5	)	$	17.1		$	(2.4	)
Three months ended June 30, 2016
Earned premiums	$	123.1		$	148.3		$	—		$	271.4
Loss and loss adjustment expense	(99.4		)	(80.3		)	—			(179.7		)
Policy acquisition expenses	(21.6		)	(27.1		)	—			(48.7		)
Other underwriting expenses	(22.3		)	(28.6		)	—			(50.9		)
Total underwriting income (loss)	(20.2		)	12.3			—			(7.9		)
Net investment income	—			—			12.1			12.1
Net realized and change in unrealized investment gains	—			—			24.7			24.7
Net other revenues	—			0.2			0.6			0.8
General and administrative expenses	—			(0.5		)	(3.0		)	(3.5		)
Interest expense	—			—			(3.2		)	(3.2		)
Pre-tax income (loss)	$	(20.2	)	$	12.0		$	31.2		$	23.0

	Insurance Operations						Investing, Financing and Corporate
($ in millions)	Specialty Products			Specialty Industries						Consolidated
Six months ended June 30, 2017
Earned premiums	$	249.6		$	289.6		$	—		$	539.2
Loss and loss adjustment expense	(181.5		)	(157.7		)	—			(339.2		)
Policy acquisition expenses	(41.6		)	(52.1		)	—			(93.7		)
Other underwriting expenses	(45.5		)	(65.8		)	—			(111.3		)
Total underwriting income (loss)	(19.0		)	14.0			—			(5.0		)
Net investment income	—			—			26.7			26.7
Net realized and change in unrealized investment gains	—			—			27.3			27.3
Net other revenues (expenses)	(0.1		)	0.4			5.2			5.5
General and administrative expenses	—			(1.0		)	(12.8		)	(13.8		)
Interest expense	—			—			(6.6		)	(6.6		)
Pre-tax income (loss)	$	(19.1	)	$	13.4		$	39.8		$	34.1
Six months ended June 30, 2016
Earned premiums	$	246.3		$	303.7		$	—		$	550.0
Loss and loss adjustment expense	(185.8		)	(152.7		)	—			(338.5		)
Policy acquisition expenses	(44.8		)	(54.9		)	—			(99.7		)
Other underwriting expenses	(43.6		)	(62.6		)	—			(106.2		)
Total underwriting income (loss)	(27.9		)	33.5			—			5.6
Net investment income	—			—			26.5			26.5
Net realized and change in unrealized investment gains	—			—			41.3			41.3
Net other revenues (expenses)	(0.1		)	0.5			1.3			1.7
General and administrative expenses	—			(1.0		)	(6.4		)	(7.4		)
Interest expense	—			—			(6.5		)	(6.5		)
Pre-tax income (loss)	$	(28.0	)	$	33.0		$	56.2		$	61.2

	Insurance Operations				Investing, Financing and Corporate
($ in millions)	Specialty Products		Specialty Industries				Consolidated
June 30, 2017
Assets
Total investment securities	$	—	$	—	$	2,683.7	$	2,683.7
Premiums receivable	72.9		172.5		—		245.4
Reinsurance recoverables(1)	134.3		46.5		17.2		198.0
Deferred acquisition costs	51.1		55.8		—		106.9
Ceded unearned premiums	46.2		10.4		—		56.6
Other assets	1.0		0.1		404.7		405.8
Total Assets	$	305.5	$	285.3	$	3,105.6	$	3,696.4
Liabilities
Unpaid loss and loss adjustment expense reserves(1)	$	778.7	$	615.3	$	17.2	$	1,411.2
Unearned premiums	301.9		293.3		—		595.2
Funds held under insurance contracts	210.2		—		—		210.2
Debt	—		—		273.3		273.3
Other liabilities	—		—		191.7		191.7
Total Liabilities	$	1,290.8	$	908.6	$	482.2	$	2,681.6
December 31, 2016
Assets
Total investment securities	$	—	$	—	$	2,620.4	$	2,620.4
Premiums receivable	80.1		148.2		—		228.3
Reinsurance recoverables(1)	120.9		40.3		18.3		179.5
Deferred acquisition costs	46.1		50.2		—		96.3
Ceded unearned premiums	33.7		10.5		—		44.2
Other assets	1.1		0.1		420.0		421.2
Total Assets	$	281.9	$	249.3	$	3,058.7	$	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves(1)	$	734.9	$	612.4	$	18.3	$	1,365.6
Unearned premiums	307.3		267.8		—		575.1
Funds held under insurance contracts	153.0		—		—		153.0
Debt	—		—		273.2		273.2
Other liabilities	—		—		197.8		197.8
Total Liabilities	$	1,195.2	$	880.2	$	489.3	$	2,564.7

_______________________________________________________________________________

⁽¹⁾  Atlantic Specialty Insurance Company ("ASIC"), the top tier regulated U.S. insurance operating subsidiary of the Company, is ceding to Bedivere 100% of the legacy runoff business that was written by ASIC or one of the ongoing entities. As of June 30, 2017 and December 31, 2016, $17.2 million and $18.3 million, respectively, are included in both unpaid loss and loss adjustment expense reserves and reinsurance recoverables included within Investing, Financing, and Corporate.

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Retirement Plans

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Retirement Plans

NOTE 8. Retirement Plans

OneBeacon previously sponsored the OneBeacon qualified pension plan (the "Qualified Plan"). During the six months ended June 30, 2016, the Qualified Plan finalized its termination by purchasing group annuity contracts from the Principal Financial Group ("Principal"), and making lump sum distributions to Qualified Plan participants electing such payments, which eliminated the remaining Qualified Plan liability, and also ceased administratively paying benefits. As a result of these transactions, the Company recognized a pre-tax pension settlement charge of $0.2 million during the six months ended June 30, 2016, and no longer has a projected benefit obligation with respect to the Qualified Plan. During the year ended December 31, 2016, the Company transferred $47.1 million of excess invested assets from the Qualified Plan into the trust supporting the OneBeacon 401(k) Savings and Employee Stock Ownership Plan ("KSOP"), which is the Qualified Replacement Plan ("QRP"), with $14.3 million of excess invested assets remaining in the Qualified Plan trust as of June 30, 2017 in order to wind-down potential post-termination obligations of that plan, as approved by way of a March 2016 private letter ruling from the IRS. The invested assets related to both the legacy Qualified Plan trust and the QRP of $43.0 million as of June 30, 2017, are included in other assets and are accounted for at fair value with related income recognized in net other revenues.

OneBeacon continues to sponsor a non-qualified, non-contributory, defined benefit pension plan ("Non-qualified Plan") covering certain employees who were employed as of December 31, 2001 and former employees who had met the eligibility requirements, as well as retirees. The Non-qualified Plan was frozen and curtailed in 2002 resulting in the pension benefit obligation being equal to the accumulated benefit obligation. The benefits are based primarily on years of service and employees’ compensation through December 31, 2002. OneBeacon’s funding policy is generally to contribute amounts to satisfy actual disbursements for the calendar year.

The components of net periodic benefit cost for the three and six months ended June 30, 2017 and 2016 for the Non-qualified Plan and Qualified Plan were as follows:

	Three months ended  June 30,					Six months ended June 30,
($ in millions)	2017 (1)		2016			2017		2016
Service cost	$	—	$	—		$	—	$	0.2
Interest cost	0.2		0.3			0.4		1.1
Expected return on plan assets	—		—			—		(1.0		)
Amortization of unrecognized loss	0.2		0.2			0.4		0.5
Net periodic pension cost	0.4		0.5			0.8		0.8
Settlement loss(2)	—		(0.1		)	—		0.2
Total net periodic benefit income	$	0.4	$	0.4		$	0.8	$	1.0

_______________________________________________________________________________

⁽¹⁾ Represents the components of net periodic benefit cost for the Non-qualified Plan as the Qualified Plan was terminated in 2016.

⁽²⁾ Represents the impact of the termination of the Qualified Plan during the three and six months ended June 30, 2016.

OneBeacon anticipates contributing $2.1 million to the Non-qualified Plan in 2017, for which OneBeacon has assets held in a rabbi trust. During the three and six months ended June 30, 2017, the Company contributed $0.5 million and $1.0 million, respectively, to the Non-qualified Plan.

OneBeacon sponsors an employee savings plan (defined contribution plan) covering the majority of employees. The contributory plan historically provided qualifying employees with matching contributions of 50% of the first 6% of salary (subject to federal limits on allowable contributions in a given year). During mid-2016, the matching contribution of the contributory plan was replaced with a fixed 3% of salary employer contribution (subject to federal limits on allowable contributions in a given year). Total expense for the contribution was $0.8 million and $0.7 million in the three months ended June 30, 2017, and 2016, respectively and $1.8 million and $1.4 million in the six months ended June 30, 2017 and 2016, respectively. The employee savings plan also includes an employee stock ownership component. See Note 9—"Employee Share-Based Incentive Compensation Plans."

OneBeacon had a post-employment benefit liability related to disability and health benefits available to former employees that are no longer employed by the Company of $2.7 million and $3.1 million as of June 30, 2017 and December 31, 2016, respectively.

OneBeacon also had a post-employment benefit liability related to death benefits to beneficiaries of former executives that are no longer employed by the Company of $12.8 million both June 30, 2017 and December 31, 2016. OneBeacon has set aside funds to satisfy its obligation in a rabbi trust of $22.7 million and $29.3 million as of June 30, 2017 and December 31, 2016, respectively. During the last half of 2016, the Company withdrew $5.5 million from the rabbi trust in accordance with the trust agreement, which remains overfunded.

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Employee Share-Based Incentive Compensation Plans

6 Months Ended

Jun. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Employee Share-Based Incentive Compensation Plans

NOTE 9. Employee Share-Based Incentive Compensation Plans

OneBeacon's share-based compensation plans include performance shares, restricted shares and restricted stock units ("RSUs"), which are designed to maximize shareholder value over long periods of time by aligning the financial interests of its management with those of its owners. Performance shares are payable only upon achievement of pre-defined business goals and are valued based on the market value of OneBeacon's common shares at the time awards are earned. Performance shares and restricted stock units are typically paid in cash, though, in some instances, they may be paid in common shares or may be deferred in accordance with the terms of OneBeacon's deferred compensation plan. Beginning with the 2017-2019 cycle, performance shares were eliminated as a component of the Company's share-based compensation. Restricted shares vest either annually in equal installments over the specified service period or cliff-vest in full after the service period, depending on the award. OneBeacon expenses the full cost of all its share-based compensation over the requisite service period. The Company recognized expense related to its share-based compensation plans, including the KSOP plan, of $6.5 million and $2.5 million for the three months ended June 30, 2017 and 2016, respectively and $9.5 million and $5.2 million for the six months ended June 30, 2017 and 2016, respectively.

Performance Shares

The following summarizes performance share activity for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,
	2017			2016
($ in millions)	Target Performance Shares outstanding	Accrued expense		Target Performance Shares outstanding	Accrued expense
Beginning of period	309,796	$	1.9	441,206	$	1.1
Payments and deferrals (1)	—	—		—	—
New awards	—	—		—	—
Forfeitures and net change in assumed forfeitures	—	—		—	—
Expense (income) recognized (2)	—	2.0		—	(0.1		)
End of period	309,796	$	3.9	441,206	$	1.0

	Six months ended June 30,
	2017				2016
($ in millions)	Target Performance Shares outstanding		Accrued expense		Target Performance Shares outstanding		Accrued expense
Beginning of period	452,519		$	1.6	449,435		$	1.4
Payments and deferrals (1)	(142,710	)	—		(167,300	)	(0.7		)
New awards	—		—		163,150		—
Forfeitures and net change in assumed forfeitures	(13	)	—		(4,079	)	—
Expense (income) recognized (2)	—		2.3		—		0.3
End of period	309,796		$	3.9	441,206		$	1.0

_______________________________________________________________________________

⁽¹⁾  There were no Performance share payments in 2017 for the 2014-2016 performance cycle due to the factor being zero. Performance share payments in 2016 for the 2013-2015 performance cycle were based upon a performance factor of 24.3%.

⁽²⁾  The assumed performance factor for the 2015-2017 performance cycle was increased to 100% during the three months ended June 30, 2017 as per the terms of the OneBeacon Acquisition.

The following summarizes performance shares outstanding and accrued performance share expense at June 30, 2017 for each performance cycle:

($ in millions)	Target OB Performance Shares outstanding	Accrued expense
Performance cycle:
2015 — 2017	146,646	$	2.5
2016 — 2018	163,150	1.4
Subtotal	309,796	3.9
Assumed forfeitures	—	—
Total at June 30, 2017	309,796	$	3.9

All performance shares cliff vest on December 31 of the last year in the cycle. If 100% of the outstanding performance shares had been vested on June 30, 2017, the total additional compensation cost to be recognized would have been $1.9 million, based on current accrual factors (common share price, accumulated dividends and payout assumptions) at June 30, 2017.

All performance shares earned and paid were settled in cash or by deferral into OneBeacon's deferred compensation plan.

Restricted Shares

On February 28, 2017, OneBeacon issued to certain employees 461,160 shares of restricted stock having a grant date fair value of $7.4 million, of which 235,000 were issued in anticipation of a sale transaction, as described in Note 2—"OneBeacon Acquisition," andare scheduled to cliff vest on August 28, 2018, 110,710 are scheduled to vest in two equal installments on February 24, 2018 and February 24, 2019, and 115,450 are scheduled to cliff vest on January 1, 2020.

On February 24, 2016, OneBeacon issued to certain employees 170,650 shares of restricted stock having a grant date fair value of $2.3 million, of which 92,500 are scheduled to cliff vest in full on February 24, 2018 and the remaining 78,150 are scheduled to cliff vest in full on January 1, 2019.

On February 24, 2015, OneBeacon issued to certain employees 75,950 shares of restricted stock having a grant date fair value of $1.1 million, of which 67,722 were outstanding as of June 30, 2017 and are scheduled to cliff vest in full on January 1, 2018.

On May 25, 2011, OneBeacon issued to its CEO 630,000 shares of restricted stock, of which 157,500 restricted shares vested on each of February 22, 2014, 2015, 2016, and 2017.

The restricted shares contain dividend participation features and therefore are considered participating securities.

The following summarizes restricted shares activity for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,
	2017				2016
($ in millions)	Restricted Shares	Unamortized Issue Date Fair Value			Restricted Shares	Unamortized Issue Date Fair Value
Beginning of period	699,532	$	8.6		395,872	$	4.3
New awards	—	—			—	—
Forfeitures	—	—			—	—
Vested	—	—			—	—
Expense recognized	—	(1.5		)	—	(0.8		)
End of period	699,532	$	7.1		395,872	$	3.5

	Six months ended June 30,
	2017					2016
($ in millions)	Restricted Shares		Unamortized Issue Date Fair Value			Restricted Shares		Unamortized Issue Date Fair Value
Beginning of period	395,872		$	2.1		382,722		$	2.5
New awards	461,160		7.4			170,650		2.3
Forfeitures	—		—			—		—
Vested	(157,500	)	—			(157,500	)	—
Expense recognized	—		(2.4		)	—		(1.3		)
End of period	699,532		$	7.1		395,872		$	3.5

Restricted shares that vested during the six months ended June 30, 2017 and 2016 had a grant date fair value of $2.1 million and $2.1 million, respectively. No shares vested during the three months ended June 30, 2017 or 2016. As of June 30, 2017, unrecognized compensation expense of $7.1 million related to restricted stock awards is expected to be recognized over a weighted-average period of 0.8 years.

Restricted Stock Units

During the six months ended June 30, 2017, 240,840 RSUs were issued, 239,470 of which were outstanding as of June 30, 2017. The RSUs are scheduled to cliff vest in full on December 31, 2019, at which time the RSUs will be paid out in cash or shares at the discretion of the Compensation Committee. During the six months ended June 30, 2016, 227,788 RSUs were issued, of which 206,502 were outstanding as of June 30, 2017. The expense associated with the RSUs, which is being recognized over the vesting period, was $1.5 million and $0.5 million for the three months ended June 30,2017 and 2016, respectively, and $2.1 million and $0.9 million for the six months ended June 30,2017 and 2016, respectively.

If 100% of outstanding RSUs had vested on June 30, 2017, additional compensation cost to be recognized would have been $7.0 million, based on current accrual factors (common share price and accumulated dividends) as of June 30, 2017.

Share-Based Compensation under Qualified Retirement Plans

OneBeacon sponsors a defined contribution plan, the KSOP. Under the KSOP, participants have the ability to invest their balances in several different investment options, including the common shares of White Mountains and the common shares of the Company. OneBeacon has recorded $1.5 million and $1.3 million in compensation expense to pay benefits and allocate common shares to participants' accounts for the three months ended June 30,2017 and 2016, respectively, and recorded $2.7 million and $2.7 million for the six months ended June 30,2017 and 2016, respectively.

As of June 30, 2017 and December 31, 2016, the KSOP owned less than 3% of either of the total White Mountains common shares outstanding or the total Company common shares outstanding. All common shares held by the KSOP are considered outstanding for earnings per share computations.

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Income Taxes

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 10. Income Taxes

OneBeacon and its Bermuda-domiciled subsidiaries are not subject to Bermuda income tax under current Bermuda law. In the event that there is a change in the current law such that taxes are imposed, OneBeacon and its Bermuda-domiciled subsidiaries would be exempt from such tax until March 31, 2035, pursuant to the Bermuda Exempted Undertakings Tax Protection Act of 1966. OneBeacon also has subsidiaries that operate in Gibraltar, Barbados, Luxembourg, Ireland, the United Kingdom and the United States. U.S. operations are financed with a combination of debt and equity and the financing income and underwriting income currently account for the majority of non-U.S. earnings.

OneBeacon's income tax benefit related to pre-tax income for the three months ended June 30, 2017 and 2016 represented a net effective tax rate of 112.5% and (8.7)%, respectively, and for the six months ended June 30, 2017 and 2016 represented a net effective tax rate of 3.5% and (17.5)%, respectively. The effective tax rates for the three and six months ended June 30, 2017 and 2016, were lower than the U.S. statutory rate of 35% due to income generated in jurisdictions other than the United States, principally representing interest income and underwriting income taxed in a jurisdiction with a lower effective tax rate. Additionally, the rate for the three months ended June 30, 2016 was impacted by a $3.5 million favorable settlement of the 2010-2012 IRS exam and the rate for the six months ended June 30, 2016 was impacted by a $12.8 million favorable settlement of the 2007-2009 IRS exam in addition to the $3.5 million favorable settlement of the 2010-2012 IRS exam. For the three months ended June 30, 2017 and 2016, the effective tax rate on non-U.S. income was 0.7% and 0.5%, respectively and for the six months ended June 30, 2017 and 2016, the effective tax rate on non-U.S. income was 0.3% and 0.7%, respectively.

In arriving at the effective tax rate for the three and six months ended June 30, 2017 and 2016, OneBeacon forecasted all income and expense items including the realized and change in unrealized investment gains for the years ending December 31, 2017 and 2016, and included these gains in the effective tax rate calculation.

OneBeacon records a valuation allowance against deferred tax assets if it becomes more likely than not that all or a portion of a deferred tax asset will not be realized. Changes in valuation allowances from period to period are included in income tax expense in the period of change. In determining whether or not a valuation allowance, or change therein, is warranted, OneBeacon considers factors such as prior earnings history, expected future earnings, carryback and carryforward periods as well as prudent and economically feasible strategies that, if executed would result in the realization of a deferred tax asset. It is possible that certain planning strategies or projected earnings in certain subsidiaries may not be feasible to utilize the entire deferred tax asset, which could result in material changes to OneBeacon’s deferred tax assets and tax expense.

OneBeacon classifies all interest and penalties on unrecognized tax benefits as part of income tax expense. With few exceptions, OneBeacon is no longer subject to U.S. federal, state or non-U.S. income tax examinations by tax authorities for years before 2013.

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Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

NOTE 11. Fair Value of Financial Instruments

OneBeacon carries its financial instruments on its balance sheet at fair value with the exception of its investment in qualified affordable housing projects, which is accounted for using the proportional amortization method, and fixed-rate, long-term indebtedness. For certain financial instruments where quoted market prices are not available, other independent valuation techniques and assumptions are used. Because considerable judgment is used, these estimates are not necessarily indicative of amounts that could be realized in a current market exchange. Certain financial instruments are excluded from disclosure, including insurance contracts.

As of June 30, 2017 and December 31, 2016, the fair value of OneBeacon's 2012 Senior Notes (its fixed-rate, long-term indebtedness) was $282.4 million and $274.2 million, respectively. As described in Note 6—"Debt", the net carrying value of the 2012 Senior Notes was $273.3 million and $273.2 million as of June 30, 2017 and December 31, 2016, respectively. The fair value measurement of the 2012 Senior Notes is classified as Level 2 in the valuation hierarchy and determined based on the closing market price at the end of the fiscal quarter.

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Legal Contingencies

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Legal Contingencies

NOTE 12. Legal Contingencies

OneBeacon, and the insurance and reinsurance industry in general, is routinely subject to claims related litigation and arbitration in the normal course of business, as well as litigation and arbitration that does not arise from, or directly relate to, claims activity. OneBeacon's estimates of the costs of settling matters routinely encountered in claims activity are reflected in the reserves for unpaid loss and LAE. See Note 3—"Unpaid Loss and Loss Adjustment Expense ("LAE") Reserves."

OneBeacon evaluates its exposure to non-claims related litigation and arbitration and establishes accruals for litigation and arbitration if it is probable that a loss has been incurred and it can be reasonably estimated. Disclosure of litigation and arbitration is made if it is probable that a loss has been incurred or if there is a reasonable possibility that a loss may have been incurred. Although the ultimate outcome of claims and non-claims related litigation and arbitration, and the amount or range of potential loss at any particular time, is often inherently uncertain, management does not believe that the ultimate outcome of such claims and non-claims related litigation and arbitration will have a material adverse effect on OneBeacon's financial position, full year results of operations, or cash flows.

The following summarizes significant ongoing non-claims related litigation or arbitration as of June 30, 2017:

Litigation Related to the OneBeacon Acquisition

 On June 2, 2017, Stephen Bushansky, a purported Company shareholder, filed a class action complaint against the Company and each of the Company’s directors in the U.S. District Court for the District of Minnesota (the “Minnesota Court”), purportedly on behalf of the Company’s public shareholders. Thereafter, three additional lawsuits were filed in the Minnesota Court by additional purported shareholders, Darrin Dickers, Raymond Martino and Robert Berg (collectively with Bushansky, the “Plaintiffs”). The complaints in each pending class action allege that the Company’s preliminary proxy statement filed with the U.S. Securities and Exchange Commission (“SEC”) omitted or misrepresented certain material information, allegedly in violation of Sections 14(a) and 20(a) of the Securities Exchange Act of 1934 and SEC Rule 14a-9 and sought to enjoin the Company and Intact Financial Corporation from closing the OneBeacon Acquisition, or if the Acquisition closes, to award Plaintiffs damages and costs.

On June 26, 2017, Plaintiffs jointly filed a motion for preliminary injunction to enjoin the shareholder vote on the OneBeacon Acquisition, but withdrew their motion on July 7, 2017. Company shareholders approved the OneBeacon Acquisition on July 18, 2017 at a special general meeting of shareholders. Plaintiffs have not dismissed their cases and OneBeacon’s responsive pleadings are due August 14, 2017. The Company believes the cases lack merit and continues to vigorously defend this litigation.

Deutsche Bank Litigation

In June 2011, Deutsche Bank Trust Company Americas, Law Debenture Company of New York and Wilmington Trust Company (collectively referred to as “Plaintiffs”), in their capacity as trustees for certain senior notes issued by the Tribune Company (“Tribune”), filed lawsuits in various jurisdictions (the “Noteholder Actions”) against numerous defendants including OneBeacon, OneBeacon-sponsored benefit plans and other affiliates of White Mountains in their capacity as former shareholders of Tribune seeking recovery of the proceeds from the sale of common stock of Tribune in connection with Tribune's leveraged buyout in 2007 (the “LBO”). Tribune filed for bankruptcy in 2008 in the Delaware bankruptcy court (the “Bankruptcy Court”). The Bankruptcy Court granted Plaintiffs permission to commence these LBO-related actions, and in 2011, the Judicial Panel on Multidistrict Litigation granted a motion to consolidate the actions for pretrial matters and transferred all such proceedings to the United States District Court for the Southern District of New York (the SDNY). Plaintiffs seek recovery of the proceeds received by the former Tribune shareholders on a theory of constructive fraudulent transfer asserting that Tribune purchased or repurchased its common shares without receiving fair consideration at a time when it was, or as a result of the purchases of shares, was rendered, insolvent. OneBeacon has entered into a joint defense agreement with other affiliates of White Mountains that are defendants in the action. OneBeacon and OneBeacon-sponsored benefit plans received approximately $32 million for Tribune common stock tendered in connection with the LBO. The Court granted an omnibus motion to dismiss the Noteholders Action in September 2013 and plaintiffs appealed. On March 29, 2016, a three judge panel of the U.S Second Circuit Court of Appeals affirmed the dismissal of the Noteholders Action. On July 22, 2016, the Plaintiff's petition to the Second Circuit for reconsideration or for a rehearing en banc was denied in full. On September 9, 2016 the Plaintiffs filed for a writ of certiorari, seeking review in the United States Supreme Court.

In addition, OneBeacon, OneBeacon-sponsored benefit plans and other affiliates of White Mountains in their capacity as former shareholders of Tribune, along with thousands of former Tribune shareholders, have been named as defendants in an adversary proceeding brought by the Official Committee of Unsecured Creditors of the Tribune Company (the “Committee”), on behalf of the Tribune Company, which seeks to avoid the repurchase of shares by Tribune in the LBO on a theory of intentional fraudulent transfer (the “Committee Action”). Tribune emerged from bankruptcy in 2012, and a litigation trustee replaced the Committee as plaintiff in the Committee Action. This matter was consolidated for pretrial matters with the Noteholder Actions in the SDNY and was stayed pending the motion to dismiss in the Noteholder Action. An omnibus motion to dismiss the shareholder defendants in the Committee Action was filed in May 2014 and the motion was granted on January 6, 2017. The plaintiff has requested permission to move the SDNY to certify the decision as a final judgment capable of immediate appeal. No amount has been accrued in connection with this matter as of June 30, 2017, as the amount of loss, if any, cannot be reasonably estimated.

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Earnings per Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Earnings per Share

NOTE 13. Earnings per Share

Basic and diluted earnings per share amounts are based on the weighted average number of common shares outstanding, including unvested restricted shares that are considered participating securities. Diluted earnings per share amounts are based on the weighted average number of common shares including unvested restricted shares.

The following table outlines the Company's computation of earnings per share for net income attributable to OneBeacon's common shareholders for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Earnings attributable to OneBeacon's common shareholders—basic and diluted (in millions):
Net income (loss) attributable to OneBeacon's common shareholders	$	(0.1	)	$	24.5		$	32.0		$	70.9
Allocation of income for participating unvested restricted common shares	—			(0.1		)	(0.2		)	(0.3		)
Dividends paid on participating restricted common shares	(0.2		)	(0.1		)	(0.3		)	(0.1		)
Total allocation to restricted common shares	(0.2		)	(0.2		)	(0.5		)	(0.4		)
Net income (loss) attributable to OneBeacon's common shareholders, net of restricted common share amounts	$	(0.3	)	$	24.3		$	31.5		$	70.5
Undistributed net earnings (in millions):
Net income attributable to OneBeacon's common shareholders, net of restricted common share amounts	$	(0.3	)	$	24.3		$	31.5		$	70.5
Dividends paid, net of restricted common share amounts	(19.7		)	(19.7		)	(39.5		)	(39.5		)
Total undistributed (overdistributed) net earnings, net of restricted common share amounts	$	(20.0	)	$	4.6		$	(8.0	)	$	31.0
Earnings per share denominator—basic and diluted (in millions):
Total weighted average common shares outstanding	94.7			94.3			94.6			94.4
Weighted average unvested restricted common shares(1)	(0.7		)	(0.4		)	(0.6		)	(0.4		)
Basic and diluted earnings per share denominator	94.0			93.9			94.0			94.0
Earnings per share attributable to OneBeacon's common shareholders—basic and diluted (in dollars):
Net income attributable to OneBeacon's common shareholders	$	—		$	0.26		$	0.34		$	0.75
Dividends declared and paid	(0.21		)	(0.21		)	(0.42		)	(0.42		)
Undistributed (overdistributed) earnings	$	(0.21	)	$	0.05		$	(0.08	)	$	0.33

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⁽¹⁾  Restricted shares outstanding vest in equal installments upon a stated date or upon the occurrence of a specified event.

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Common Shareholders' Equity and Noncontrolling Interest

6 Months Ended

Jun. 30, 2017

Stockholders' Equity Note [Abstract]

Common Shareholders' Equity and Noncontrolling Interest

NOTE 14. Common Shareholders' Equity and Noncontrolling Interest

Common Shares Repurchased and Retired

On August 22, 2007, the Company's Board authorized the repurchase of up to $200.0 million of its Class A common shares from time to time, subject to market conditions. Shares may be repurchased on the open market or through privately negotiated transactions. This authorization does not have a stated expiration date. No shares were repurchased under the share repurchase authorization during the six months ended June 30, 2017. During the six months ended June 30, 2016, 850,349 shares were repurchased under the share repurchase authorization for $10.6 million at an average share price of $12.42. The amount of authorization remaining is $75.0 million as of June 30, 2017.

During the six months ended June 30, 2017 and 2016, the Company repurchased 67,273 and 64,981 common shares, respectively, for $1.1 million and $0.9 million, to satisfy employee income tax withholding, pursuant to employee benefit plans. Shares repurchased pursuant to employee benefit plans do not reduce the board authorization referred to above.

Dividends on Common Shares

During the six months ended June 30, 2017 and 2016 the Company declared and paid cash dividends to OneBeacon shareholders of 0.42 per common share for a total of $39.8 million and $39.6 million, respectively.

Accumulated Other Comprehensive Loss

The pre-tax components of the Company's other comprehensive income and the related tax expense are as follows:

	Six months ended June 30,
($ in millions)	2017			2016
Net change in benefit plan assets and obligations	$	0.4		$	0.3
Income tax expense	(0.1		)	(0.1		)
Net change in benefit plan assets and obligations, net of tax	$	0.3		$	0.2

Noncontrolling Interests

On June 30, 2017, A.W.G. Dewar, Inc. ("Dewar"), which is consolidated within OneBeacon's financial statements, repurchased $4.1 million of stock from Dewar management. As a result of the repurchase, OneBeacon owns approximately 89% of Dewar as of June 30, 2017, an increase from ownership of 81% as of December 31, 2016.

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Consolidating Financial Information

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Consolidating Financial Information

NOTE 15. Consolidating Financial Information

The Company has fully and unconditionally guaranteed the 2012 Senior Notes issued by its 100% owned subsidiary, OBH, as well as any draw made by OBH on the Credit Facility, which was undrawn as of June 30, 2017. The following tables present OneBeacon's consolidating balance sheets as of June 30, 2017 and December 31, 2016 and statements of operations and comprehensive income for the three and six months ended June 30, 2017 and 2016 and cash flows for the six months ended June 30, 2017 and 2016. These financial statements reflect the Company's ("guarantor") financial position, results of operations and cash flows on a stand-alone basis, that of OBH ("the issuer") and of the Company's other entities ("non-guarantor subsidiaries") as well as the necessary consolidating adjustments to eliminate intercompany balances and transactions.

Consolidating Balance Sheet As of June 30, 2017 (in millions)	The Company (guarantor)		Non-guarantor subsidiaries			OBH (issuer)		Consolidating adjustments			Consolidated
Assets
Investment Securities:
Fixed maturity investments, at fair value	$	—	$	2,288.6		$	—	$	—		$	2,288.6
Short-term investments, at amortized cost (which approximates fair value)	5.4		44.2			5.9		—			55.5
Common equity securities, at fair value	—		205.5			—		—			205.5
Other investments	—		134.1			—		—			134.1
Total investment securities	5.4		2,672.4			5.9		—			2,683.7
Cash	—		71.2			0.1		—			71.3
Reinsurance recoverables	—		198.0			—		—			198.0
Premiums receivable	—		245.4			—		—			245.4
Deferred acquisition costs	—		106.9			—		—			106.9
Ceded unearned premiums	—		56.6			—		—			56.6
Net deferred tax asset	—		130.0			—		0.1			130.1
Investment income accrued	—		12.9			—		—			12.9
Accounts receivable on unsettled investment sales	—		5.8			—		—			5.8
Investments in subsidiaries	1,015.6		—			966.9		(1,982.5		)	—
Other assets	0.6		184.0			1.1		—			185.7
Total assets	$	1,021.6	$	3,683.2		$	974.0	$	(1,982.4	)	$	3,696.4
Liabilities
Unpaid loss and loss adjustment expense reserves	$	—	$	1,411.2		$	—	$	—		$	1,411.2
Unearned premiums	—		595.2			—		—			595.2
Funds held under insurance contracts	—		210.2			—		—			210.2
Debt	—		—			273.3		—			273.3
Accounts payable on unsettled investment purchases	—		9.3			—		—			9.3
Other liabilities	6.5		171.0			4.9		—			182.4
Total liabilities	6.5		2,396.9			278.2		—			2,681.6
OneBeacon's common shareholders' equity and noncontrolling interests
Total OneBeacon's common shareholders' equity	1,015.1		1,286.6			695.8		(1,982.4		)	1,015.1
Total noncontrolling interests	—		(0.3		)	—		—			(0.3		)
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,015.1		1,286.3			695.8		(1,982.4		)	1,014.8
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$	1,021.6	$	3,683.2		$	974.0	$	(1,982.4	)	$	3,696.4

Consolidating Balance Sheet As of December 31, 2016 (in millions)	The Company (guarantor)		Non-guarantor subsidiaries		OBH (issuer)		Consolidating adjustments			Consolidated
Assets
Investment Securities:
Fixed maturity investments, at fair value	$	—	$	2,169.1	$	—	$	—		$	2,169.1
Short-term investments, at amortized cost (which approximates fair value)	2.5		108.1		1.5		—			112.1
Common equity securities, at fair value	—		188.7		—		—			188.7
Other investments	—		150.5		—		—			150.5
Total investment securities	2.5		2,616.4		1.5		—			2,620.4
Cash	—		69.5		0.1		—			69.6
Reinsurance recoverables	—		179.5		—		—			179.5
Premiums receivable	—		228.3		—		—			228.3
Deferred acquisition costs	—		96.3		—		—			96.3
Ceded unearned premiums	—		44.2		—		—			44.2
Net deferred tax asset	—		126.6		—		0.1			126.7
Investment income accrued	—		11.3		—		—			11.3
Accounts receivable on unsettled investment sales	—		1.4		—		—			1.4
Investments in subsidiaries	1,018.8		—		989.4		(2,008.2		)	—
Other assets	0.4		211.4		0.4		—			212.2
Total assets	$	1,021.7	$	3,584.9	$	991.4	$	(2,008.1	)	$	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves	$	—	$	1,365.6	$	—	$	—		$	1,365.6
Unearned premiums	—		575.1		—		—			575.1
Funds held under insurance contracts	—		153.0		—		—			153.0
Debt	—		—		273.2		—			273.2
Other liabilities	0.4		190.6		6.8		—			197.8
Total liabilities	0.4		2,284.3		280.0		—			2,564.7
OneBeacon's common shareholders' equity and noncontrolling interests
Total OneBeacon's common shareholders' equity	1,021.3		1,296.7		711.4		(2,008.1		)	1,021.3
Total noncontrolling interests	—		3.9		—		—			3.9
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,021.3		1,300.6		711.4		(2,008.1		)	1,025.2
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$	1,021.7	$	3,584.9	$	991.4	$	(2,008.1	)	$	3,589.9

Consolidating Statement of Operations and Comprehensive Income (Loss) Three months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	277.4		$	—		$	—		$	277.4
Net investment income	—			14.5			—			—			14.5
Net realized and change in unrealized investment gains	—			12.3			—			—			12.3
Net other revenues	—			2.1			—			—			2.1
Total revenues	—			306.3			—			—			306.3
Expenses
Loss and loss adjustment expenses	—			188.6			—			—			188.6
Policy acquisition expenses	—			48.4			—			—			48.4
Other underwriting expenses	—			59.6			—			—			59.6
General and administrative expenses	6.5			2.2			0.1			—			8.8
Interest expense	—			—			3.3			—			3.3
Total expenses	6.5			298.8			3.4			—			308.7
Pre-tax income (loss)	(6.5		)	7.5			(3.4		)	—			(2.4		)
Income tax benefit	—			1.5			1.2			—			2.7
Income (loss) before equity in earnings of unconsolidated affiliates	(6.5		)	9.0			(2.2		)	—			0.3
Equity in earnings of subsidiaries, net of tax	6.4			—			0.5			(6.9		)	—
Net income including noncontrolling interests	(0.1		)	9.0			(1.7		)	(6.9		)	0.3
Less: Net income attributable to noncontrolling interests	—			(0.4		)	—			—			(0.4		)
Net income (loss) attributable to OneBeacon's common shareholders	(0.1		)	8.6			(1.7		)	(6.9		)	(0.1		)
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	0.1		$	8.6		$	(1.5	)	$	(7.1	)	$	0.1

Consolidating Statement of Operations and Comprehensive Income Three months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	271.4		$	—		$	—		$	271.4
Net investment income	—			12.1			—			—			12.1
Net realized and change in unrealized investment gains	—			24.7			—			—			24.7
Net other revenues	—			0.8			—			—			0.8
Total revenues	—			309.0			—			—			309.0
Expenses
Loss and loss adjustment expenses	—			179.7			—			—			179.7
Policy acquisition expenses	—			48.7			—			—			48.7
Other underwriting expenses	—			50.9			—			—			50.9
General and administrative expenses	1.2			2.1			0.2			—			3.5
Interest expense	—			—			3.2			—			3.2
Total expenses	1.2			281.4			3.4			—			286.0
Pre-tax income (loss)	(1.2		)	27.6			(3.4		)	—			23.0
Income tax benefit	—			—			2.0			—			2.0
Net income (loss) before equity in earnings of unconsolidated affiliates	(1.2		)	27.6			(1.4		)	—			25.0
Equity in earnings of subsidiaries, net of tax	25.7			—			18.0			(43.7		)	—
Net income including noncontrolling interests	24.5			27.6			16.6			(43.7		)	25.0
Less: Net income attributable to noncontrolling interests	—			(0.5		)	—			—			(0.5		)
Net income attributable to OneBeacon's common shareholders	24.5			27.1			16.6			(43.7		)	24.5
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	24.7		$	27.1		$	16.8		$	(43.9	)	$	24.7

Consolidating Statement of Operations and Comprehensive Income Six months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	539.2		$	—		$	—		$	539.2
Net investment income	—			26.7			—			—			26.7
Net realized and change in unrealized investment gains	—			27.3			—			—			27.3
Net other revenues	—			5.5			—			—			5.5
Total revenues	—			598.7			—			—			598.7
Expenses
Loss and loss adjustment expenses	—			339.2			—			—			339.2
Policy acquisition expenses	—			93.7			—			—			93.7
Other underwriting expenses	—			111.3			—			—			111.3
General and administrative expenses	9.4			4.2			0.2			—			13.8
Interest expense	—			—			6.6			—			6.6
Total expenses	9.4			548.4			6.8			—			564.6
Pre-tax income (loss)	(9.4		)	50.3			(6.8		)	—			34.1
Income tax benefit (expense)	—			(3.8		)	2.6			—			(1.2		)
Net income (loss) before equity in earnings of unconsolidated affiliates	(9.4		)	46.5			(4.2		)	—			32.9
Equity in earnings of subsidiaries, net of tax	41.4			—			11.7			(53.1		)	—
Net income including noncontrolling interests	32.0			46.5			7.5			(53.1		)	32.9
Less: Net income attributable to noncontrolling interests	—			(0.9		)	—			—			(0.9		)
Net income attributable to OneBeacon's common shareholders	32.0			45.6			7.5			(53.1		)	32.0
Other comprehensive income, net of tax	0.3			—			0.3			(0.3		)	0.3
Comprehensive income attributable to OneBeacon's common shareholders	$	32.3		$	45.6		$	7.8		$	(53.4	)	$	32.3

Consolidating Statement of Operations and Comprehensive Income Six months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	550.0		$	—		$	—		$	550.0
Net investment income	—			26.5			—			—			26.5
Net realized and change in unrealized investment gains	—			41.3			—			—			41.3
Net other revenues	—			1.7			—			—			1.7
Total revenues	—			619.5			—			—			619.5
Expenses
Loss and loss adjustment expenses	—			338.5			—			—			338.5
Policy acquisition expenses	—			99.7			—			—			99.7
Other underwriting expenses	—			106.2			—			—			106.2
General and administrative expenses	2.4			4.8			0.2			—			7.4
Interest expense	—			—			6.5			—			6.5
Total expenses	2.4			549.2			6.7			—			558.3
Pre-tax income (loss)	(2.4		)	70.3			(6.7		)	—			61.2
Income tax benefit	—			7.1			3.6			—			10.7
Net income (loss) before equity in earnings of unconsolidated affiliates	(2.4		)	77.4			(3.1		)	—			71.9
Equity in earnings of subsidiaries, net of tax	73.3			—			40.7			(114.0		)	—
Net income including noncontrolling interests	70.9			77.4			37.6			(114.0		)	71.9
Less: Net income attributable to noncontrolling interests	—			(1.0		)	—			—			(1.0		)
Net income attributable to OneBeacon's common shareholders	70.9			76.4			37.6			(114.0		)	70.9
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	71.1		$	76.4		$	37.8		$	(114.2	)	$	71.1

Consolidating Statement of Cash Flows Six months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Cash flows from operations:
Net income including noncontrolling interests	$	32.0		$	46.5		$	7.5		$	(53.1	)	$	32.9
Charges (credits) to reconcile net income to cash flows provided from (used for) operations:
Undistributed earnings from subsidiaries	(41.4		)	—			(11.7		)	53.1			—
Net realized and change in unrealized investment gains	—			(27.3		)	—			—			(27.3		)
Deferred income tax benefit	—			(2.6		)	—			—			(2.6		)
Dividends received from subsidiaries	45.0			—			—			(45.0		)	—
Other operating items:
Net change in loss and LAE reserves	—			45.6			—			—			45.6
Net change in unearned premiums	—			20.1			—			—			20.1
Net change in ceded unearned premiums	—			(12.4		)	—			—			(12.4		)
Net change in premiums receivable	—			(17.1		)	—			—			(17.1		)
Net change in reinsurance recoverables on paid and unpaid losses	—			(18.5		)	—			—			(18.5		)
Net change in funds held under insurance contracts	—			57.2			—			—			57.2
Net change in other assets and liabilities	8.2			2.5			(2.4		)	—			8.3
Net cash provided from (used for) operations	43.8			94.0			(6.6		)	(45.0		)	86.2
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	(2.9		)	63.9			(4.4		)	—			56.6
Maturities of fixed maturity investments	—			158.6			—			—			158.6
Sales of fixed maturity investments	—			686.1			—			—			686.1
Sales of common equity securities	—			5.8			—			—			5.8
Return of capital and distributions of other investments	—			13.5			—			—			13.5
Purchases of fixed maturity investments	—			(957.9		)	—			—			(957.9		)
Purchases of common equity securities	—			(6.2		)	—			—			(6.2		)
Contributions for other investments	—			(0.9		)	—			—			(0.9		)
Net change in unsettled investment purchases and sales	—			4.8			—			—			4.8
Net acquisitions of property and equipment	—			(4.0		)	—			—			(4.0		)
Capital contribution from parent	—			23.5			34.5			(58.0		)	—
Net cash provided from (used for) investing activities	(2.9		)	(12.8		)	30.1			(58.0		)	(43.6		)
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.8		)	—			—			—			(39.8		)
Cash dividends paid to parent	—			(45.0		)	—			45.0			—
Capital contribution to subsidiary	—			(34.5		)	(23.5		)	58.0			—
Repurchases and retirements of common stock	(1.1		)	—			—			—			(1.1		)
Payments on capital lease obligation	—			—			—			—			—
Net cash used for financing activities	(40.9		)	(79.5		)	(23.5		)	103.0			(40.9		)
Net increase in cash during period	—			1.7			—			—			1.7
Cash balance at beginning of period	—			69.5			0.1			—			69.6
Cash balance at end of period	$	—		$	71.2		$	0.1		$	—		$	71.3

Consolidating Statement of Cash Flows Six months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Cash flows from operations:
Net income including noncontrolling interests	$	70.9		$	77.4		$	37.6		$	(114.0	)	$	71.9
Charges (credits) to reconcile net income to cash flows provided from (used for) operations:
Undistributed earnings from subsidiaries	(73.3		)	—			(40.7		)	114.0			—
Net realized and change in unrealized investment gains	—			(41.3		)	—			—			(41.3		)
Deferred income tax expense	—			19.2			—			—			19.2
Dividends received from subsidiaries	51.0			—			—			(51.0		)	—
Other operating items:
Net change in loss and LAE reserves	—			(13.2		)	—			—			(13.2		)
Net change in unearned premiums	—			(3.9		)	—			—			(3.9		)
Net change in ceded unearned premiums	—			(5.0		)	—			—			(5.0		)
Net change in premiums receivable	—			(19.9		)	—			—			(19.9		)
Net change in reinsurance recoverables on paid and unpaid losses	—			10.0			—			—			10.0
Net change in funds held under insurance contracts	—			3.2			—			—			3.2
Net change in other assets and liabilities	1.2			(35.4		)	(4.1		)	—			(38.3		)
Net cash provided from (used for) operations	49.8			(8.9		)	(7.2		)	(51.0		)	(17.3		)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	1.3			(47.8		)	1.1			—			(45.4		)
Maturities of fixed maturity investments	—			229.5			—			—			229.5
Sales of fixed maturity investments	—			218.8			24.2			(42.5		)	200.5
Sales of common equity securities	—			174.4			—			—			174.4
Return of capital and distributions of other investments	—			7.0			—			—			7.0
Purchases of fixed maturity investments	—			(473.6		)	(18.3		)	42.5			(449.4		)
Purchases of common equity securities	—			(109.5		)	—			—			(109.5		)
Contributions for other investments	—			(0.4		)	—			—			(0.4		)
Net change in unsettled investment purchases and sales	—			42.5			—			—			42.5
Net acquisitions of property and equipment	—			(2.1		)	—			—			(2.1		)
Capital contribution from parent	—			27.3			28.5			(55.8		)	—
Net cash provided from investing activities	1.3			66.1			35.5			(55.8		)	47.1
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.6		)	—			—			—			(39.6		)
Cash dividends paid to parent	—			(51.0		)	—			51.0			—
Capital contribution to subsidiary	—			(28.5		)	(27.3		)	55.8			—
Repurchases and retirements of common stock	(11.5		)	—			—			—			(11.5		)
Payments on capital lease obligation	—			(1.0		)	—			—			(1.0		)
Net cash used for financing activities	(51.1		)	(80.5		)	(27.3		)	106.8			(52.1		)
Net increase (decrease) in cash during period	—			(23.3		)	1.0			—			(22.3		)
Cash balance at beginning of period	—			94.6			0.6			—			95.2
Cash balance at end of period	$	—		$	71.3		$	1.6		$	—		$	72.9

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Nature of Operations and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Recently Adopted Changes in Accounting Principles

Recently Adopted Changes in Accounting Principles

Stock Compensation

Effective January 1, 2017, OneBeacon adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (ASC 718) which simplifies certain aspects of the accounting for share-based compensation. The new guidance provides an accounting policy election to account for forfeitures by either applying an assumption, as required under existing guidance, or by recognizing forfeitures when they actually occur. At adoption, OneBeacon did not change its accounting policy for forfeitures, which is to apply an assumed forfeiture rate. The new guidance has also changed the threshold for partial cash settlement to settle statutory withholding requirements for equity classified awards, increasing the threshold up to the maximum statutory tax rate.

In addition, the new guidance changed the treatment for excess tax benefits which arise from the difference between the deduction for tax purposes and the compensation costs recognized for financial reporting. Previously, excess tax benefits were recognized through other comprehensive income. Under the new guidance, OneBeacon will recognize excess tax benefits or expense in current period earnings.

Short-Duration Contracts

Effective December 31, 2016, OneBeacon adopted ASU 2015-09, Disclosures about Short Duration Contracts (ASC 944) which requires expanded footnote disclosures about loss and loss adjustment expense ("LAE") reserves. Upon adoption, OneBeacon modified its disclosures in the Company's 2016 Annual Report on Form 10-K to include loss development tables on a disaggregated basis by accident year and a reconciliation of loss development data to the loss and LAE reserves reflected on the balance sheet. The footnote disclosures were also expanded to include information about claim frequency data, including a description of how the claims frequency data is measured. Prior year disclosures were modified to conform to the new disclosures. There was no impact upon adoption to the financial statements contained herein as OneBeacon was already disclosing the new required loss rollforward. See Note 3—"Unpaid Loss and Loss Adjustment Expense (LAE) Reserves".

Recently Issued Accounting Pronouncements

Cash Flow Statement

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (ASC 230), which addresses the classification and presentation of certain items, including debt prepayment and extinguishment costs, contingent consideration payments made after a business combination and distributions received from equity method investees, for which there was diversity in practice.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash (ASC230). Under current guidance, restricted amounts of cash or cash equivalents are excluded from the cash flow statement. The new guidance requires restricted cash and restricted cash equivalents to be included in the reconciliation of beginning and end-of-period amounts presented on the statement of cash flows. In addition, the new guidance requires a description of the nature of the changes in restricted cash and cash equivalents during the periods presented.

The updated guidance in ASU 2016-15 and ASU 2016-18 are both effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. OneBeacon does not expect the adoption of this guidance to have a material impact on its consolidated statement of cash flows.

Credit Losses

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (ASC 326), which establishes new guidance for the recognition of credit losses for financial assets measured at amortized cost. The new ASU, which applies to financial assets that have the contractual right to receive cashrequires reporting entities to estimate the credit losses expected over the life of a credit exposure using historical information, current information, and reasonable and supportable forecasts that affect the collectability of the financial asset. The types of assets included in the scope of the new guidance includes premium receivables, reinsurance recoverables, and loans. ASU 2016-13 is effective for annual periods beginning after January 1, 2020, including interim periods. OneBeacon measures financial assets at fair value with changes therein recognized in current period earnings and accordingly, does not expect adoption to have a significant impact on its financial statements.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (ASC 842). The new guidance requires lessees to recognize lease assets and liabilities on the balance sheet for both operating and financing leases, with the exception of leases with an original term of 12 months or less. Under existing guidance recognition of lease assets and liabilities is not required for operating leases. The lease assets and liabilities to be recognized are both measured initially based on the present value of the lease payments. Under the new guidance, a sale-leaseback transaction must meet the recognition criteria under ASC 606, Revenues in order to be accounted for as a sale. The new guidance is effective for OneBeacon for years beginning after December 15, 2018, including interim periods therein. OneBeacon is evaluating the expected impact of this new guidance and available adoption methods.

Financial Instruments - Recognition and Measurement

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (ASC 825-10). The new ASU modifies the guidance for financial instruments, including investments in equity securities. Under the new guidance, all equity securities with readily determinable fair values are required to be measured at fair value with changes therein recognized through current period earnings. In addition, the new ASU requires a qualitative assessment for equity securities without readily determinable fair values to identify impairment, and for impaired equity securities to be measured at fair value. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017, with early adoption permitted. OneBeacon measures its portfolio of investment securities at fair value with changes therein recognized through current period earnings accordingly, does not expect the adoption of ASU 2016-01 to have a significant impact on its financial statements.

Stock Compensation

In May 2017, the FASB issued ASU 2017-09, Stock Compensation: Scope of Modification Accounting (ASC 718), which narrows the scope of transactions subject to modification accounting to changes in terms of an award that result in a change in the award's fair value, vesting conditions, or classification. ASU 2017-09 is effective for fiscal years beginning after December 15, 2017. OneBeacon does not expect the adoption of this guidance to have a material impact on its financial statements.

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (ASC 606), which modifies the guidance for revenue recognition. Under ASU 2014-09, revenue is to be recognized at an amount that reflects the consideration to which an entity expects to be entitled in exchange for goods and services transferred to customers. The new guidance sets forth the steps to be followed to recognize revenue: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the entity satisfies a performance obligation. Subsequently, the FASB issued additional ASUs clarifying the guidance in and providing implementation guidance for ASU 2014-09.In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (ASC 606),which delays the effective date of ASU 2014-09 and all related ASUs to annual and interim periods beginning after December 15, 2017. Most of OneBeacon's revenue from customer relates to insurance contracts, which are excluded from the scope of ASU 2014-09, as are investment income and investment gains and losses. However, the new guidance is applicable to some of OneBeacon's revenue streams, including certain fee arrangements as well as commissions and other non-insurance revenues. OneBeacon is evaluating the new guidance, but does not expect ASU 2014-09 to have a significant effect on recognition of OneBeacon's non-insurance revenues from customers.

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Unpaid Loss and Loss Adjustment Expense (LAE) Reserves (Tables)

6 Months Ended

Jun. 30, 2017

Insurance Loss Reserves [Abstract]

Loss and loss adjustment expense (LAE) reserve activities

The following table summarizes the loss and LAE reserve activities of OneBeacon's insurance subsidiaries for the three and six months ended June 30, 2017 and 2016:

	Three months ended  June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Gross beginning balance	$	1,368.8		$	1,343.8		$	1,365.6		$	1,389.8
Less beginning reinsurance recoverables on unpaid losses	(174.7		)	(150.4		)	(172.9		)	(186.0		)
Net beginning loss and LAE reserves	1,194.1			1,193.4			1,192.7			1,203.8
Loss and LAE incurred relating to:
Current year losses	181.3			164.3			331.9			323.1
Prior year losses	7.3			15.4			7.3			15.4
Total incurred loss and LAE	188.6			179.7			339.2			338.5
Loss and LAE paid relating to:
Current year losses	(36.4		)	(37.1		)	(57.7		)	(59.1		)
Prior year losses	(132.1		)	(122.2		)	(260.0		)	(269.4		)
Total loss and LAE payments	(168.5		)	(159.3		)	(317.7		)	(328.5		)
Net ending loss and LAE reserves	1,214.2			1,213.8			1,214.2			1,213.8
Plus ending reinsurance recoverables on unpaid losses	197.0			162.8			197.0			162.8
Gross ending loss and LAE reserves	$	1,411.2		$	1,376.6		$	1,411.2		$	1,376.6

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Reinsurance (Tables)

6 Months Ended

Jun. 30, 2017

Reinsurance Disclosures [Abstract]

Reinsurers

The following table summarizes A.M. Best Company, Inc. ("A.M. Best") ratings for OneBeacon's reinsurers, excluding industry pools and associations, based upon reinsurance recoverable amounts on paid and unpaid losses and LAE:

	Balance at June 30, 2017		% of total
A.M.Best's Rating(1):	($ in millions)
A+ or better	$	85.9	43	%
A- to A	83.4		42	%
B, Not Rated and Other(2)	28.7		15	%
Total reinsurance recoverables	$	198.0	100	%

_______________________________________________________________________________

⁽¹⁾ A.M. Best's ratings as detailed above are "A+ or better" (Superior), "A- to A" (Excellent) and "B" (Fair).

⁽²⁾ Includes reinsurance recoverable on unpaid losses from Bedivere Insurance Company ("Bedivere"), one of the legal entities transferred as part of the runoff transaction in 2014, of $17.2 million.

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Investment Securities (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of Investments [Abstract]

Net investment income, pre-tax

Net investment income for the three and six months ended June 30, 2017 and 2016 consisted of the following:

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Fixed maturity investments	$	14.1		$	12.2		$	26.7		$	24.3
Short-term investments	0.1			0.1			0.2			0.1
Common equity securities	0.9			0.5			1.7			1.5
Other investments(1)	0.4			0.5			0.4			3.0
Gross investment income	15.5			13.3			29.0			28.9
Less investment expenses	(1.0		)	(1.2		)	(2.3		)	(2.4		)
Net investment income, pre-tax	$	14.5		$	12.1		$	26.7		$	26.5

_______________________________________________________________________________

⁽¹⁾ Includes an interest payment on the surplus notes of $2.4 million received in the six months ended June 30, 2016.

Net realized and unrealized investment gains (losses), pre-tax

The composition of net realized investment gains and losses consisted of the following:

	Three months ended  June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Fixed maturity investments	$	0.8		$	0.4		$	(0.3	)	$	(1.0	)
Common equity securities	0.7			3.7			1.0			(1.0		)
Other investments	(1.0		)	(3.0		)	0.2			(2.8		)
Net realized investment gains (losses), pre-tax	$	0.5		$	1.1		$	0.9		$	(4.8	)

Net unrealized investment gains (losses)

The net changes in net unrealized gains for the three and six months ended June 30, 2017 and 2016 are as follows:

	Three months ended June 30, 2017								Six months ended June 30, 2017
($ in millions)	Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in unrealized gains reflected in revenues			Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in fair value reflected in revenues
Fixed maturity investments	$	4.8		$	1.9	$	6.7		$	12.1		$	2.0	$	14.1
Common equity securities	5.2			—		5.2			15.3			—		15.3
Other investments	(0.1		)	—		(0.1		)	(3.0		)	—		(3.0		)
Net change, pre-tax	$	9.9		$	1.9	$	11.8		$	24.4		$	2.0	$	26.4

	Three months ended June 30, 2016								Six months ended June 30, 2016
($ in millions)	Changes in net unrealized investment gains			Changes in net foreign currency gains (losses)		Total net changes in unrealized gains reflected in revenues			Changes in net unrealized investment gains		Changes in net foreign currency gains (losses)		Total net changes in fair value reflected in revenues
Fixed maturity investments	$	12.0		$	—	$	12.0		$	27.0	$	—	$	27.0
Common equity securities	(5.4		)	—		(5.4		)	4.3		—		4.3
Other investments	17.0			—		17.0			14.8		—		14.8
Net change, pre-tax	$	23.6		$	—	$	23.6		$	46.1	$	—	$	46.1

Gross unrealized investment gains or losses

The components of OneBeacon's ending net unrealized investment gains and losses, excluding the impact of net unrealized foreign currency translation gains and losses, on its investment portfolio as of June 30, 2017 and December 31, 2016 were as follows:

($ in millions)	June 30, 2017			December 31, 2016
Investment securities:
Gross unrealized investment gains	$	72.2		$	52.7
Gross unrealized investment losses	(7.1		)	(12.0		)
Total net unrealized investment gains, pre-tax	65.1			40.7
Income taxes	(20.4		)	(14.0		)
Total net unrealized investment gains, after-tax	$	44.7		$	26.7

Investment holdings, fixed maturity investments

The cost or amortized cost, gross unrealized pre-tax investment gains and losses, net foreign currency gains and losses and carrying values of OneBeacon's fixed maturity investments as of June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
U.S. Government and agency obligations	$	56.0	$	—	$	(0.3	)	$	—	$	55.7
Debt securities issued by corporations	892.7		9.6		(0.7		)	2.0		903.6
Municipal obligations	69.7		1.3		(0.4		)	—		70.6
Mortgage and asset-backed securities	1,238.8		3.7		(2.4		)	—		1,240.1
Foreign government obligations	4.3		0.1		—			—		4.4
Preferred stocks	8.3		5.9		—			—		14.2
Total fixed maturity investments	$	2,269.8	$	20.6	$	(3.8	)	$	2.0	$	2,288.6

	December 31, 2016
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
U.S. Government and agency obligations	$	169.6	$	—	$	(2.3	)	$	—	$	167.3
Debt securities issued by corporations	760.6		6.2		(3.7		)	—		763.1
Municipal obligations	70.1		0.8		(0.4		)	—		70.5
Mortgage and asset-backed securities	1,154.8		1.8		(3.5		)	—		1,153.1
Foreign government obligations	1.0		0.2		—			—		1.2
Preferred stocks	8.3		5.6		—			—		13.9
Total fixed maturity investments	$	2,164.4	$	14.6	$	(9.9	)	$	—	$	2,169.1

Debt securities, credit ratings

The following table summarizes the credit ratings⁽¹⁾ of the debt securities issued by corporations owned by OneBeacon as of June 30, 2017 and December 31, 2016:

	at Fair value
($ in millions)	June 30, 2017		December 31, 2016
AA	$	62.6	$	63.7
A	255.7		169.1
BBB	491.4		450.8
BB	87.0		70.8
B	6.9		8.7
Debt securities issued by corporations	$	903.6	$	763.1

_______________________________________________________________________________

⁽¹⁾ Credit ratings are assigned based on the following hierarchy: 1) Standard and Poor’s Financial Services LLC (“Standard and Poor’s”) and 2) Moody’s Investor Service (“Moody’s”).

Investment holdings, common equity securities, convertible fixed maturity investments and other investments

The cost or amortized cost, gross unrealized pre-tax investment gains and losses, net unrealized pre-tax foreign currency gains and losses and carrying values of common equity securities and other investments as of June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
Common equity securities	$	183.8	$	22.5	$	(0.8	)	$	—	$	205.5
Other investments	107.5		29.1		(2.5		)	—		134.1
Total common equity securities and other investments	$	291.3	$	51.6	$	(3.3	)	$	—	$	339.6

	December 31, 2016
($ in millions)	Cost or amortized cost		Gross unrealized gains		Gross unrealized losses			Net unrealized foreign currency gains (losses)		Carrying value
Common equity securities	$	182.3	$	6.9	$	(0.5	)	$	—	$	188.7
Other investments	120.9		31.2		(1.6		)	—		150.5
Total common equity securities and other investments	$	303.2	$	38.1	$	(2.1	)	$	—	$	339.2

Fair value measurements by level, investment securities

The following tables summarize the Company's fair value measurements for investments as of June 30, 2017 and December 31, 2016 by level. The major security types were based on the legal form of the securities. OneBeacon has disaggregated its fixed maturity investments based on the issuing entity type, which impacts credit quality, with debt securities issued by U.S. government entities carrying minimal credit risk, while the credit and other risks associated with other issuers, such as corporations, foreign governments, municipalities or entities issuing asset-backed securities vary depending on the nature of the issuing entity type. OneBeacon further disaggregates debt securities issued by corporations and common equity securities by industry sector because investors often reference commonly used benchmarks and their subsectors to monitor risk and performance. Accordingly, OneBeacon has further disaggregated these asset classes into subclasses based on the similar sectors and industry classifications the Company uses to evaluate investment risk and performance against commonly used benchmarks, such as the Bloomberg Barclays U.S. Intermediate Aggregate and S&P 500 indices.

($ in millions)	Fair value at June 30, 2017		Level 1		Level 2		Level 3
Fixed maturity investments:
U.S. Government and agency obligations	$	55.7	$	55.7	$	—	$	—
Debt securities issued by corporations:
Consumer	187.3		—		187.3		—
Financials	154.9		—		154.9		—
Industrial	141.6		—		140.0		1.6
Health Care	122.3		—		122.3		—
Utilities	81.9		—		81.9		—
Technology	63.8		—		63.8		—
Communications	58.4		—		58.4		—
Basic materials	51.4		—		51.4		—
Energy	42.0		—		42.0		—
Debt securities issued by corporations	903.6		—		902.0		1.6
Municipal obligations	70.6		—		70.6		—
Mortgage and asset-backed securities	1,240.1		—		1,227.4		12.7
Foreign government obligations	4.4		0.6		3.8		—
Preferred stocks	14.2		—		14.2		—
Fixed maturity investments	2,288.6		56.3		2,218.0		14.3
Short-term investments	55.5		55.5		—		—
Common equity securities:
Exchange traded funds(1)	177.9		152.4		25.5		—
Health Care	6.2		6.2		—		—
Financials	5.4		5.4		—		—
Consumer	4.8		4.8		—		—
Communications	3.3		3.3		—		—
Technology	3.3		3.3		—		—
Industrial	3.3		3.3		—		—
Energy	1.3		1.3		—		—
Common equity securities	205.5		180.0		25.5		—
Other investments(2)(3)	84.7		—		—		84.7
Total(1)(2)(3)	$	2,634.3	$	291.8	$	2,243.5	$	99.0

_______________________________________________________________________________

⁽¹⁾ ETFs traded on foreign exchanges are priced using the fund's published NAV to account for the difference in market close times and are therefore designated as level 2 measurements.

⁽²⁾  Excludes the carrying value of $11.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method and ($2.5) million related to foreign currency forward contracts.

⁽³⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds of $40.6 million for which NAV is generally the practical expedient are no longer classified within the fair value hierarchy.

($ in millions)	Fair value at December 31, 2016		Level 1		Level 2		Level 3
Fixed maturity investments:
U.S. Government and agency obligations	$	167.3	$	167.3	$	—	$	—
Debt securities issued by corporations:
Consumer	194.8		—		194.8		—
Healthcare	129.2		—		129.2		—
Industrial	118.2		—		118.2		—
Financials	96.3		—		96.3		—
Communications	59.4		—		59.4		—
Energy	47.4		—		47.4		—
Technology	40.7		—		40.7		—
Utilities	39.5		—		39.5		—
Basic materials	37.6		—		37.6		—
Debt securities issued by corporations	763.1		—		763.1		—
Municipal obligations	70.5		—		70.5		—
Mortgage and asset-backed securities	1,153.1		—		1,153.1		—
Foreign government obligations	1.2		0.6		0.6		—
Preferred stocks	13.9		—		13.9		—
Fixed maturity investments	2,169.1		167.9		2,001.2		—
Short-term investments	112.1		112.1		—		—
Common equity securities:
Exchange traded funds(1)	164.4		140.9		23.5		—
Healthcare	7.0		7.0		—		—
Consumer	4.3		4.3		—		—
Financials	3.9		3.9		—		—
Technology	3.7		3.7		—		—
Communications	3.5		3.5		—		—
Energy	1.2		1.2		—		—
Industrial	0.7		0.7		—		—
Common equity securities	188.7		165.2		23.5		—
Other investments(2)(3)	86.2		—		—		86.2
Total(1)(2)(3)	$	2,556.1	$	445.2	$	2,024.7	$	86.2

_______________________________________________________________________________

⁽¹⁾ ETFs traded on foreign exchanges are priced using the fund's published NAV to account for the difference in market close times and are therefore designated as level 2 measurements.

⁽²⁾  Excludes the carrying value of $12.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method.

⁽³⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds of $52.0 million for which NAV is generally the practical expedient are no longer classified within the fair value hierarchy.

Fair Value Assets Measured on Recurring Basis Measurement Input Reconciliation

The following tables summarize the changes in OneBeacon’s fair value measurements by level for the three and six months ended June 30, 2017 and 2016:

							Level 3 Investments
($ in millions)	Level 1 Investments			Level 2 Investments			Fixed maturity investments			Other investments(1)			NAV investments(2)			Total(1)(2)(3)
Balance at January 1, 2017	$	333.1		$	2,024.7		$	—		$	86.2		$	52.0		$	2,496.0
Amortization/accretion	—			(4.1		)	—			—			—			(4.1		)
Net realized and unrealized gains	9.4			7.2			0.1			(2.1		)	0.6			15.2
Purchases	9.3			539.4			47.1			—			0.8			596.6
Sales	(121.4		)	(479.2		)	—			—			(13.2		)	(613.8		)
Transfers in	—			—			—			—			—			—
Transfers out	—			—			—			—			—			—
Balance at March 31, 2017	$	230.4		$	2,088.0		$	47.2		$	84.1		$	40.2		$	2,489.9
Amortization/accretion	—			(3.4		)	—			—			—			(3.4		)
Net realized and unrealized gains	5.1			8.3			—			0.6			0.6			14.6
Purchases	5.4			348.7			14.3			—			0.1			368.5
Sales	(4.6		)	(245.3		)	—			—			(0.3		)	(250.2		)
Transfers in	—			47.2			—			—			—			47.2
Transfers out	—			—			(47.2		)	—			—			(47.2		)
Balance at June 30, 2017	$	236.3		$	2,243.5		$	14.3		$	84.7		$	40.6		$	2,619.4

_______________________________________________________________________________

⁽¹⁾  Excludes the carrying value of $11.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method and $(2.5) million related to foreign currency forward contracts as of June 30, 2017.

⁽²⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds measured generally using the NAV practical expedient are no longer classified within the fair value hierarchy.

⁽³⁾  Excludes short-term investments.

							Level 3 Investments
($ in millions)	Level 1 Investments			Level 2 Investments			Fixed maturity investments		Other investments(1)		NAV investments(2)			Total(1)(2)(3)
Balance at January 1, 2016	$	363.3		$	1,945.9		$	70.0	$	65.8	62.5			$	2,507.5
Amortization/accretion	—			(3.2		)	—		—		—			(3.2		)
Net realized and unrealized gains	5.6			12.5			0.5		0.4		(2.4		)	16.6
Purchases	98.2			187.0			—		—		0.4			285.6
Sales	(158.4		)	(216.8		)	—		—		(3.0		)	(378.2		)
Transfers in	—			—			—		—		—			—
Transfers out	—			—			—		—		—			—
Balance at March 31, 2016	$	308.7		$	1,925.4		$	70.5	$	66.2	$	57.5		$	2,428.3
Amortization/accretion	—			(2.9		)	—		—		—			(2.9		)
Net realized and unrealized gains	(2.1		)	12.1			0.7		10.9		3.1			24.7
Purchases	38.5			221.2			13.9		—		0.2			273.8
Sales	(75.5		)	(153.6		)	—		—		(4.1		)	(233.2		)
Transfers in	—			—			—		—		—			—
Transfers out	—			—			—		—		—			—
Balance at June 30, 2016	$	269.6		$	2,002.2		$	85.1	$	77.1	$	56.7		$	2,490.7

_______________________________________________________________________________

⁽¹⁾  Excludes the carrying value of $13.4 million associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method as of June 30, 2016.

⁽²⁾  As described in Note 1—"Nature of Operations and Summary of Significant Accounting Policies" investments in hedge funds and private equity funds generally measured using the NAV practical expedient are no longer classified within the fair value hierarchy.

⁽³⁾  Excludes short-term investments.

Net unrealized gains or losses for Level 3 investments

The following table summarizes the change in net pre-tax unrealized gains or losses for assets designated as Level 3 for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,				Six months ended June 30,
($ in millions)	2017		2016		2017			2016
Fixed maturity investments	$	—	$	0.7	$	0.1		$	1.2
Other investments	0.6		10.9		(1.5		)	11.3
Total	$	0.6	$	11.6	$	(1.4	)	$	12.5

Fair value, significant unobservable inputs

The following summarizes significant unobservable inputs used in estimating the fair value of fixed maturity and other investments classified within Level 3, as of June 30, 2017 and December 31, 2016.

($ in millions)	As of June 30, 2017
Description	Fair Value		Rating(1)	Valuation Technique	Unobservable Inputs	Input
Surplus notes:
- Seller priority note	$	48.9	N/R	Discounted cash flow	Discount rate(2)	10.6%
					Timing of interest payments(3)	2020
					Timing of principal payments(3)	2030
- Pari passu note	$	21.6	N/R	Discounted cash flow	Discount rate(4)	15.2%
					Timing of interest payments(5)	2021
					Timing of principal payments(5)	2035
Non-agency residential mortgage-backed securities	$	7.7	AAA	Broker pricing	Broker quote (6)	$	102.0
Non-agency commercial mortgage-backed securities	$	5.0	A-	Broker pricing	Broker quote (6)	$	100.0
Debt securities issued by corporations	$	1.6	BBB	Broker pricing	Broker quote (6)	$	127.5
Community reinvestment vehicle	$	14.2	N/R	Member share of GAAP net equity	GAAP net equity	$	14.2

($ in millions)	As of December 31, 2016
Description	Fair Value		Rating(1)	Valuation Technique	Unobservable Inputs	Input
Surplus notes:
- Seller priority note	$	51.1	N/R	Discounted cash flow	Discount rate(2)	9.6%
					Timing of interest payments(3)	2020
					Timing of principal payments(3)	2030
- Pari passu note	$	20.8	N/R	Discounted cash flow	Discount rate(4)	15.0%
					Timing of interest payments(5)	2021
					Timing of principal payments(5)	2035
Community reinvestment vehicle	$	14.3	N/R	Member share of GAAP net equity	GAAP net equity	$	14.3

_________________________________________________________________________

⁽¹⁾  Credit ratings, if rated, are assigned based on the following hierarchy: 1) Standard & Poor's and 2) Moody's

⁽²⁾  Stochastic modeling supporting the fair value estimation indicates that the average percentage of discounted payments missed on the seller priority note is roughly equivalent to that of a conventional debt security with a credit rating of ‘B’. The corresponding credit spread, increased by an additional 400 bps and 250 bps as of June 30, 2017 and December 31, 2016, respectively, to reflect both a liquidity discount for a private debt instrument and regulatory payment approval uncertainty, was added to the treasury rate to determine the discount rate for the seller priority note.

⁽³⁾  As of June 30, 2017 and December 31, 2016, the Company has assumed for the purpose of estimating fair value that all accrued but unpaid interest on the seller priority note since the date of issuance is paid in 2020, with regular annual interest payments beginning thereafter. Principal repayments are assumed to begin on a graduated basis in 2030.

⁽⁴⁾  Stochastic modeling supporting the fair value estimation indicates that the average percentage of discounted payments missed on the pari passu note is roughly equivalent to that of a conventional debt security with a credit rating of ‘CCC’. The corresponding credit spread, increased by an additional 400 bps and 250 bps as of June 30, 2017 and December 31, 2016, respectively, to reflect both a liquidity discount for a private debt instrument and regulatory payment approval uncertainty, was added to the treasury rate to determine the discount rate for the seller priority note.

⁽⁵⁾  As of June 30, 2017 and December 31, 2016, the company has assumed for the purpose of estimating fair value that regular annual interest payments on the pari passu note begin in 2021. All accrued but unpaid interest since the date of issuance is assumed to be paid in 2025. Principal repayments are assumed to begin on a graduated basis in 2035.

⁽⁶⁾ As of June 30, 2017, asset type consists of one security.

Mortgage-backed and asset-backed securities

The following table summarizes the carrying value of OneBeacon's mortgage and asset-backed securities as of June 30, 2017 and December 31, 2016:

	June 30, 2017						December 31, 2016
($ in millions)	Fair Value		Level 2		Level 3		Fair Value		Level 2		Level 3
Mortgage-backed securities:
Agency:
GNMA	$	170.7	$	170.7	$	—	$	213.5	$	213.5	$	—
FNMA	45.7		45.7		—		42.8		42.8		—
FHLMC	22.3		22.3		—		30.3		30.3		—
Total agency(1)	238.7		238.7		—		286.6		286.6		—
Non-agency:
Residential	218.5		210.8		7.7		135.0		135.0		—
Commercial	145.8		140.8		5.0		123.6		123.6		—
Total Non-agency	364.3		351.6		12.7		258.6		258.6		—
Total mortgage-backed securities	603.0		590.3		12.7		545.2		545.2		—
Other asset-backed securities:
Vehicle receivables	216.8		216.8		—		273.6		273.6		—
Credit card receivables	266.3		266.3		—		224.3		224.3		—
Other	154.0		154.0		—		110.0		110.0		—
Total other asset-backed securities	637.1		637.1		—		607.9		607.9		—
Total mortgage and asset-backed securities	$	1,240.1	$	1,227.4	$	12.7	$	1,153.1	$	1,153.1	$	—

_______________________________________________________________________________

⁽¹⁾ Represents publicly traded mortgage-backed securities which carry the full faith and credit guarantee of the U.S. government (i.e., GNMA) or are guaranteed by a government sponsored entity (i.e., FNMA, FHLMC).

Schedule of security issuance years of investments in non-agency RMBS and non-agency CMBS securities

The security issuance years of OneBeacon's investments in non-agency RMBS and non-agency CMBS securities as of June 30, 2017 are as follows:

	Fair Value		Security Issuance Year
($ in millions)			2004		2005		2006		2008		2010		2011		2012		2013		2014		2015		2016		2017
Total non-agency RMBS	$	218.5	$	16.8	$	5.0	$	2.5	$	2.3	$	4.7	$	7.7	$	3.5	$	17.4	$	24.9	$	50.0	$	31.0	$	52.7
Total non-agency CMBS	145.8		—		—		—		—		3.8		—		18.1		11.5		23.5		43.8		21.2		23.9
Total non-agency	$	364.3	$	16.8	$	5.0	$	2.5	$	2.3	$	8.5	$	7.7	$	21.6	$	28.9	$	48.4	$	93.8	$	52.2	$	76.6

Non-agency RMBS, collateral quality and tranche levels

The classification of the underlying collateral quality and the tranche levels of OneBeacon's non-agency RMBS securities are as follows as of June 30, 2017:

($ in millions)	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
Prime	$	218.5	$	46.2	$	172.3	$	—
Total non-agency RMBS	$	218.5	$	46.2	$	172.3	$	—

_______________________________________________________________________________

⁽¹⁾ At issuance, Super Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch Ratings ("Fitch") and were senior to other AAA or Aaa securities.

⁽²⁾ At issuance, Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were senior to non-AAA or non-Aaa securities.

⁽³⁾ At issuance, Subordinate were not rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were junior to other AAA or Aaa securities.

Non-agency CMBS, type of interest rate and tranche levels

The amount of fixed and floating rate securities and their tranche levels of OneBeacon's non-agency CMBS securities are as follows as of June 30, 2017:

($ in millions)	Fair Value		Super Senior(1)		Senior(2)		Subordinate(3)
Fixed rate CMBS	$	126.4	$	1.6	$	83.0	$	41.8
Floating rate CMBS	19.4		—		—		19.4
Total non-agency CMBS	$	145.8	$	1.6	$	83.0	$	61.2

_______________________________________________________________________________

⁽¹⁾ At issuance, Super Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's or AAA by Fitch and were senior to other AAA or Aaa securities.

⁽²⁾ At issuance, Senior, or in the case of resecuritization, the underlying securities, were rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were senior to non-AAA or non-Aaa securities.

⁽³⁾ At issuance, Subordinate were not rated AAA by Standard & Poor's, Aaa by Moody's, or AAA by Fitch and were junior to other AAA or Aaa securities.

Other Investments Not Readily Marketable

As of both June 30, 2017 and December 31, 2016, other investments reported at fair value represented approximately 5% of the total investment portfolio and consisted of the following:

($ in millions)	June 30, 2017			December 31, 2016
Hedge funds(1)	$	18.2		$	18.4
Private equity funds(2)	22.4			33.6
Total hedge funds and private equity funds	40.6			52.0
Surplus notes (par value $101.0)(3)	70.5			71.9
Investment in community reinvestment vehicle	14.2			14.3
Foreign currency forward contract	(2.5		)	—
Total other investments(4)	$	122.8		$	138.2

_______________________________________________________________________________

⁽¹⁾  Consists of 4 hedge funds as of both June 30, 2017 and December 31, 2016.

⁽²⁾  Consists of 14 and 17 private equity funds as of June 30, 2017 and December 31, 2016, respectively.

⁽³⁾  The decrease in fair value of the surplus notes during the six months ended June 30, 2017 was driven primarily by an increase in the assumed liquidity spread, partially offset by the narrowing of non-investment grade credit spreads as well as the time value of money benefit generated by moving six months closer to modeled cash receipts.

⁽⁴⁾  Excludes the carrying value of $11.3 million and $12.3 million as of June 30, 2017 and December 31, 2016, respectively, associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method.

Valuations adjustments taken to arrive at estimated fair value of the surplus notes

Below is a table illustrating the valuation adjustments taken to arrive at estimated fair value of the surplus notes as of June 30, 2017 and December 31, 2016:

	Type of Surplus Note						Total as of June 30, 2017
	Seller Priority			Pari Passu
	(in millions)
Par value	$	57.9		$	43.1		$	101.0
Fair value adjustments to reflect:
Current market rates on public debt and contract-based repayments(1)	7.9			2.1			10.0
Regulatory approval(2)	2.7			(13.7		)	(11.0		)
Liquidity adjustment(3)	(19.6		)	(9.9		)	(29.5		)
Total	(9.0		)	(21.5		)	(30.5		)
Fair value(4)	$	48.9		$	21.6		$	70.5

	Type of Surplus Note						Total as of December 31, 2016
	Seller Priority			Pari Passu
	(in millions)
Par value	$	57.9		$	43.1		$	101.0
Fair value adjustments to reflect:
Current market rates on public debt and contract-based repayments(1)	6.2			(1.1		)	5.1
Regulatory approval(2)	(0.2		)	(15.4		)	(15.6		)
Liquidity adjustment(3)	(12.8		)	(5.8		)	(18.6		)
Total	(6.8		)	(22.3		)	(29.1		)
Fair value	$	51.1		$	20.8		$	71.9

_______________________________________________________________________________

⁽¹⁾  Represents the value of the surplus notes, at current market yields on comparable publicly traded debt, and assuming issuer is allowed to make principal and interest payments when its financial capacity is available, as measured by statutory capital in excess of a 250% RBC score under the National Association of Insurance Commissioners’ risk-based capital standards for property and casualty companies. The favorable year-to-date change in impact is due principally to the narrowing of non-investment grade credit spreads as well as the time value of money benefit from moving three months closer to modeled cash receipts.

⁽²⁾  Represents anticipated delay in securing regulatory approvals of interest and principal payments to reflect graduated changes in Issuer's statutory surplus. The monetary impact of the anticipated delay is measured based on credit spreads of public securities with roughly equivalent percentages of discounted payments missed. The favorable year-to-date change in impact is driven primarily by the narrowing of non-investment grade credit spreads, which causes the anticipated delay in securing regulatory approval to be less punitive.

⁽³⁾  Represents impact of liquidity spread to account for OneBeacon's sole ownership of the notes, lack of a trading market, and unique nature of the ongoing regulatory approval process. The unfavorable year-to-date change in impact is due largely to an increase in the assumed liquidity spread to 400 basis points at June 30, 2017 from 250 basis points at December 31, 2016.

⁽⁴⁾  The decrease in fair value of the surplus notes during the six months ended June 30, 2017 was driven primarily by an increase in the assumed liquidity spread, partially offset by the narrowing of non-investment grade credit spreads as well as the time value of money benefit generated by moving six months closer to modeled cash receipts.

Other investments

The following table summarizes investments in hedge funds and private equity funds as of June 30, 2017 and December 31, 2016:

	June 30, 2017				December 31, 2016
($ in millions)	Fair Value		Unfunded Commitments		Fair Value		Unfunded Commitments
Hedge funds
Long/short equity banks and financials	$	16.1	$	—	$	15.0	$	—
Other	2.1		—		3.4		—
Total hedge funds	18.2		—		18.4		—
Private equity funds
Multi-sector	11.0		2.0		11.5		2.0
Healthcare	3.4		0.4		3.5		0.4
Energy infrastructure and services	3.2		3.0		14.1		3.2
Private equity secondaries	2.4		2.1		3.0		2.1
Direct lending / mezzanine debt	1.3		6.2		0.4		7.1
Insurance	0.9		0.1		0.8		0.1
Real estate	0.2		0.1		0.3		0.1
Total private equity funds	22.4		13.9		33.6		15.0
Total hedge funds and private equity funds	$	40.6	$	13.9	$	52.0	$	15.0

Fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds

The following summarizes the June 30, 2017 fair value of hedge funds subject to restrictions on redemption frequency and advance notice period requirements for investments in active hedge funds:

	Hedge Funds Notice Period
($ in millions)	30 - 59 days notice		60 - 89 days notice		90 - 119 days notice		120+ days notice		Total
Redemption frequency
Monthly	$	—	$	—	$	—	$	—	$	—
Quarterly	16.1		—		—		—		16.1
Annual	—		—		2.1		—		2.1
Total hedge funds	$	16.1	$	—	$	2.1	$	—	$	18.2

Fair Value of private equity funds subject to lock-up periods

As of June 30, 2017, investments in private equity funds were subject to lock-up periods as follows:

($ in millions)	1 - 3 years		3 - 5 years		5 - 10 years		>10 years		Total
Private Equity Funds—expected lock-up period remaining	$	18.7	$	2.4	$	—	$	1.3	$	22.4

Notional amount and uncollaterized balance of foreign currency forward contracts

The following table summarizes the notional amount and uncollaterized balance as of June 30, 2017:

($ in millions)	Notional Amount		Carrying Value			Standard & Poor's Rating
Counterparty
Barclays Bank PLC	$	62.6	$	(2.5	)	A-

XML

Debt (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Schedule of debt outstanding

OneBeacon's debt outstanding as of June 30, 2017 and December 31, 2016 consisted of the following:

($ in millions)	June 30, 2017			December 31, 2016
Senior unsecured notes, at face value	$	275.0		$	275.0
Unamortized original issue discount	(0.2		)	(0.2		)
Unamortized issuance costs	(1.5		)	(1.6		)
Senior unsecured notes, carrying value	$	273.3		$	273.2

XML

Segment Information (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Financial information for OneBeacon's segments

Financial information for OneBeacon's reportable segments is as follows:

	Insurance Operations						Investing, Financing and Corporate
($ in millions)	Specialty Products			Specialty Industries						Consolidated
Three months ended June 30, 2017
Earned premiums	$	130.4		$	147.0		$	—		$	277.4
Loss and loss adjustment expense	(98.6		)	(90.0		)	—			(188.6		)
Policy acquisition expenses	(22.0		)	(26.4		)	—			(48.4		)
Other underwriting expenses	(24.8		)	(34.8		)	—			(59.6		)
Total underwriting loss	(15.0		)	(4.2		)	—			(19.2		)
Net investment income	—			—			14.5			14.5
Net realized and change in unrealized investment gains	—			—			12.3			12.3
Net other revenues	—			0.2			1.9			2.1
General and administrative expenses	—			(0.5		)	(8.3		)	(8.8		)
Interest expense	—			—			(3.3		)	(3.3		)
Pre-tax income (loss)	$	(15.0	)	$	(4.5	)	$	17.1		$	(2.4	)
Three months ended June 30, 2016
Earned premiums	$	123.1		$	148.3		$	—		$	271.4
Loss and loss adjustment expense	(99.4		)	(80.3		)	—			(179.7		)
Policy acquisition expenses	(21.6		)	(27.1		)	—			(48.7		)
Other underwriting expenses	(22.3		)	(28.6		)	—			(50.9		)
Total underwriting income (loss)	(20.2		)	12.3			—			(7.9		)
Net investment income	—			—			12.1			12.1
Net realized and change in unrealized investment gains	—			—			24.7			24.7
Net other revenues	—			0.2			0.6			0.8
General and administrative expenses	—			(0.5		)	(3.0		)	(3.5		)
Interest expense	—			—			(3.2		)	(3.2		)
Pre-tax income (loss)	$	(20.2	)	$	12.0		$	31.2		$	23.0

	Insurance Operations						Investing, Financing and Corporate
($ in millions)	Specialty Products			Specialty Industries						Consolidated
Six months ended June 30, 2017
Earned premiums	$	249.6		$	289.6		$	—		$	539.2
Loss and loss adjustment expense	(181.5		)	(157.7		)	—			(339.2		)
Policy acquisition expenses	(41.6		)	(52.1		)	—			(93.7		)
Other underwriting expenses	(45.5		)	(65.8		)	—			(111.3		)
Total underwriting income (loss)	(19.0		)	14.0			—			(5.0		)
Net investment income	—			—			26.7			26.7
Net realized and change in unrealized investment gains	—			—			27.3			27.3
Net other revenues (expenses)	(0.1		)	0.4			5.2			5.5
General and administrative expenses	—			(1.0		)	(12.8		)	(13.8		)
Interest expense	—			—			(6.6		)	(6.6		)
Pre-tax income (loss)	$	(19.1	)	$	13.4		$	39.8		$	34.1
Six months ended June 30, 2016
Earned premiums	$	246.3		$	303.7		$	—		$	550.0
Loss and loss adjustment expense	(185.8		)	(152.7		)	—			(338.5		)
Policy acquisition expenses	(44.8		)	(54.9		)	—			(99.7		)
Other underwriting expenses	(43.6		)	(62.6		)	—			(106.2		)
Total underwriting income (loss)	(27.9		)	33.5			—			5.6
Net investment income	—			—			26.5			26.5
Net realized and change in unrealized investment gains	—			—			41.3			41.3
Net other revenues (expenses)	(0.1		)	0.5			1.3			1.7
General and administrative expenses	—			(1.0		)	(6.4		)	(7.4		)
Interest expense	—			—			(6.5		)	(6.5		)
Pre-tax income (loss)	$	(28.0	)	$	33.0		$	56.2		$	61.2

	Insurance Operations				Investing, Financing and Corporate
($ in millions)	Specialty Products		Specialty Industries				Consolidated
June 30, 2017
Assets
Total investment securities	$	—	$	—	$	2,683.7	$	2,683.7
Premiums receivable	72.9		172.5		—		245.4
Reinsurance recoverables(1)	134.3		46.5		17.2		198.0
Deferred acquisition costs	51.1		55.8		—		106.9
Ceded unearned premiums	46.2		10.4		—		56.6
Other assets	1.0		0.1		404.7		405.8
Total Assets	$	305.5	$	285.3	$	3,105.6	$	3,696.4
Liabilities
Unpaid loss and loss adjustment expense reserves(1)	$	778.7	$	615.3	$	17.2	$	1,411.2
Unearned premiums	301.9		293.3		—		595.2
Funds held under insurance contracts	210.2		—		—		210.2
Debt	—		—		273.3		273.3
Other liabilities	—		—		191.7		191.7
Total Liabilities	$	1,290.8	$	908.6	$	482.2	$	2,681.6
December 31, 2016
Assets
Total investment securities	$	—	$	—	$	2,620.4	$	2,620.4
Premiums receivable	80.1		148.2		—		228.3
Reinsurance recoverables(1)	120.9		40.3		18.3		179.5
Deferred acquisition costs	46.1		50.2		—		96.3
Ceded unearned premiums	33.7		10.5		—		44.2
Other assets	1.1		0.1		420.0		421.2
Total Assets	$	281.9	$	249.3	$	3,058.7	$	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves(1)	$	734.9	$	612.4	$	18.3	$	1,365.6
Unearned premiums	307.3		267.8		—		575.1
Funds held under insurance contracts	153.0		—		—		153.0
Debt	—		—		273.2		273.2
Other liabilities	—		—		197.8		197.8
Total Liabilities	$	1,195.2	$	880.2	$	489.3	$	2,564.7

_______________________________________________________________________________

⁽¹⁾  Atlantic Specialty Insurance Company ("ASIC"), the top tier regulated U.S. insurance operating subsidiary of the Company, is ceding to Bedivere 100% of the legacy runoff business that was written by ASIC or one of the ongoing entities. As of June 30, 2017 and December 31, 2016, $17.2 million and $18.3 million, respectively, are included in both unpaid loss and loss adjustment expense reserves and reinsurance recoverables included within Investing, Financing, and Corporate.

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Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of components of net periodic benefit cost (income)

The components of net periodic benefit cost for the three and six months ended June 30, 2017 and 2016 for the Non-qualified Plan and Qualified Plan were as follows:

	Three months ended  June 30,					Six months ended June 30,
($ in millions)	2017 (1)		2016			2017		2016
Service cost	$	—	$	—		$	—	$	0.2
Interest cost	0.2		0.3			0.4		1.1
Expected return on plan assets	—		—			—		(1.0		)
Amortization of unrecognized loss	0.2		0.2			0.4		0.5
Net periodic pension cost	0.4		0.5			0.8		0.8
Settlement loss(2)	—		(0.1		)	—		0.2
Total net periodic benefit income	$	0.4	$	0.4		$	0.8	$	1.0

_______________________________________________________________________________

⁽¹⁾ Represents the components of net periodic benefit cost for the Non-qualified Plan as the Qualified Plan was terminated in 2016.

⁽²⁾ Represents the impact of the termination of the Qualified Plan during the three and six months ended June 30, 2016.

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Employee Share-Based Incentive Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of performance share activity

The following summarizes performance share activity for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,
	2017			2016
($ in millions)	Target Performance Shares outstanding	Accrued expense		Target Performance Shares outstanding	Accrued expense
Beginning of period	309,796	$	1.9	441,206	$	1.1
Payments and deferrals (1)	—	—		—	—
New awards	—	—		—	—
Forfeitures and net change in assumed forfeitures	—	—		—	—
Expense (income) recognized (2)	—	2.0		—	(0.1		)
End of period	309,796	$	3.9	441,206	$	1.0

	Six months ended June 30,
	2017				2016
($ in millions)	Target Performance Shares outstanding		Accrued expense		Target Performance Shares outstanding		Accrued expense
Beginning of period	452,519		$	1.6	449,435		$	1.4
Payments and deferrals (1)	(142,710	)	—		(167,300	)	(0.7		)
New awards	—		—		163,150		—
Forfeitures and net change in assumed forfeitures	(13	)	—		(4,079	)	—
Expense (income) recognized (2)	—		2.3		—		0.3
End of period	309,796		$	3.9	441,206		$	1.0

_______________________________________________________________________________

⁽¹⁾  There were no Performance share payments in 2017 for the 2014-2016 performance cycle due to the factor being zero. Performance share payments in 2016 for the 2013-2015 performance cycle were based upon a performance factor of 24.3%.

⁽²⁾  The assumed performance factor for the 2015-2017 performance cycle was increased to 100% during the three months ended June 30, 2017 as per the terms of the OneBeacon Acquisition.

Summary of performance shares outstanding and accrued expense for performance shares awarded under the OB Incentive Plan

The following summarizes performance shares outstanding and accrued performance share expense at June 30, 2017 for each performance cycle:

($ in millions)	Target OB Performance Shares outstanding	Accrued expense
Performance cycle:
2015 — 2017	146,646	$	2.5
2016 — 2018	163,150	1.4
Subtotal	309,796	3.9
Assumed forfeitures	—	—
Total at June 30, 2017	309,796	$	3.9

Summary of restricted shares activity

The following summarizes restricted shares activity for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,
	2017				2016
($ in millions)	Restricted Shares	Unamortized Issue Date Fair Value			Restricted Shares	Unamortized Issue Date Fair Value
Beginning of period	699,532	$	8.6		395,872	$	4.3
New awards	—	—			—	—
Forfeitures	—	—			—	—
Vested	—	—			—	—
Expense recognized	—	(1.5		)	—	(0.8		)
End of period	699,532	$	7.1		395,872	$	3.5

	Six months ended June 30,
	2017					2016
($ in millions)	Restricted Shares		Unamortized Issue Date Fair Value			Restricted Shares		Unamortized Issue Date Fair Value
Beginning of period	395,872		$	2.1		382,722		$	2.5
New awards	461,160		7.4			170,650		2.3
Forfeitures	—		—			—		—
Vested	(157,500	)	—			(157,500	)	—
Expense recognized	—		(2.4		)	—		(1.3		)
End of period	699,532		$	7.1		395,872		$	3.5

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Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Schedule of computation of earnings per share

The following table outlines the Company's computation of earnings per share for net income attributable to OneBeacon's common shareholders for the three and six months ended June 30, 2017 and 2016:

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Earnings attributable to OneBeacon's common shareholders—basic and diluted (in millions):
Net income (loss) attributable to OneBeacon's common shareholders	$	(0.1	)	$	24.5		$	32.0		$	70.9
Allocation of income for participating unvested restricted common shares	—			(0.1		)	(0.2		)	(0.3		)
Dividends paid on participating restricted common shares	(0.2		)	(0.1		)	(0.3		)	(0.1		)
Total allocation to restricted common shares	(0.2		)	(0.2		)	(0.5		)	(0.4		)
Net income (loss) attributable to OneBeacon's common shareholders, net of restricted common share amounts	$	(0.3	)	$	24.3		$	31.5		$	70.5
Undistributed net earnings (in millions):
Net income attributable to OneBeacon's common shareholders, net of restricted common share amounts	$	(0.3	)	$	24.3		$	31.5		$	70.5
Dividends paid, net of restricted common share amounts	(19.7		)	(19.7		)	(39.5		)	(39.5		)
Total undistributed (overdistributed) net earnings, net of restricted common share amounts	$	(20.0	)	$	4.6		$	(8.0	)	$	31.0
Earnings per share denominator—basic and diluted (in millions):
Total weighted average common shares outstanding	94.7			94.3			94.6			94.4
Weighted average unvested restricted common shares(1)	(0.7		)	(0.4		)	(0.6		)	(0.4		)
Basic and diluted earnings per share denominator	94.0			93.9			94.0			94.0
Earnings per share attributable to OneBeacon's common shareholders—basic and diluted (in dollars):
Net income attributable to OneBeacon's common shareholders	$	—		$	0.26		$	0.34		$	0.75
Dividends declared and paid	(0.21		)	(0.21		)	(0.42		)	(0.42		)
Undistributed (overdistributed) earnings	$	(0.21	)	$	0.05		$	(0.08	)	$	0.33

_______________________________________________________________________________

⁽¹⁾  Restricted shares outstanding vest in equal installments upon a stated date or upon the occurrence of a specified event.

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Common Shareholders' Equity and Noncontrolling Interest Common Shareholders' Equity and Noncontrolling Interest (Tables)

6 Months Ended

Jun. 30, 2017

Stockholders' Equity Note [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The pre-tax components of the Company's other comprehensive income and the related tax expense are as follows:

	Six months ended June 30,
($ in millions)	2017			2016
Net change in benefit plan assets and obligations	$	0.4		$	0.3
Income tax expense	(0.1		)	(0.1		)
Net change in benefit plan assets and obligations, net of tax	$	0.3		$	0.2

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Consolidating Financial Information (Tables)

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Consolidating Balance Sheet

The following tables present OneBeacon's consolidating balance sheets as of June 30, 2017 and December 31, 2016 and statements of operations and comprehensive income for the three and six months ended June 30, 2017 and 2016 and cash flows for the six months ended June 30, 2017 and 2016. These financial statements reflect the Company's ("guarantor") financial position, results of operations and cash flows on a stand-alone basis, that of OBH ("the issuer") and of the Company's other entities ("non-guarantor subsidiaries") as well as the necessary consolidating adjustments to eliminate intercompany balances and transactions.

Consolidating Balance Sheet As of June 30, 2017 (in millions)	The Company (guarantor)		Non-guarantor subsidiaries			OBH (issuer)		Consolidating adjustments			Consolidated
Assets
Investment Securities:
Fixed maturity investments, at fair value	$	—	$	2,288.6		$	—	$	—		$	2,288.6
Short-term investments, at amortized cost (which approximates fair value)	5.4		44.2			5.9		—			55.5
Common equity securities, at fair value	—		205.5			—		—			205.5
Other investments	—		134.1			—		—			134.1
Total investment securities	5.4		2,672.4			5.9		—			2,683.7
Cash	—		71.2			0.1		—			71.3
Reinsurance recoverables	—		198.0			—		—			198.0
Premiums receivable	—		245.4			—		—			245.4
Deferred acquisition costs	—		106.9			—		—			106.9
Ceded unearned premiums	—		56.6			—		—			56.6
Net deferred tax asset	—		130.0			—		0.1			130.1
Investment income accrued	—		12.9			—		—			12.9
Accounts receivable on unsettled investment sales	—		5.8			—		—			5.8
Investments in subsidiaries	1,015.6		—			966.9		(1,982.5		)	—
Other assets	0.6		184.0			1.1		—			185.7
Total assets	$	1,021.6	$	3,683.2		$	974.0	$	(1,982.4	)	$	3,696.4
Liabilities
Unpaid loss and loss adjustment expense reserves	$	—	$	1,411.2		$	—	$	—		$	1,411.2
Unearned premiums	—		595.2			—		—			595.2
Funds held under insurance contracts	—		210.2			—		—			210.2
Debt	—		—			273.3		—			273.3
Accounts payable on unsettled investment purchases	—		9.3			—		—			9.3
Other liabilities	6.5		171.0			4.9		—			182.4
Total liabilities	6.5		2,396.9			278.2		—			2,681.6
OneBeacon's common shareholders' equity and noncontrolling interests
Total OneBeacon's common shareholders' equity	1,015.1		1,286.6			695.8		(1,982.4		)	1,015.1
Total noncontrolling interests	—		(0.3		)	—		—			(0.3		)
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,015.1		1,286.3			695.8		(1,982.4		)	1,014.8
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$	1,021.6	$	3,683.2		$	974.0	$	(1,982.4	)	$	3,696.4

Consolidating Balance Sheet As of December 31, 2016 (in millions)	The Company (guarantor)		Non-guarantor subsidiaries		OBH (issuer)		Consolidating adjustments			Consolidated
Assets
Investment Securities:
Fixed maturity investments, at fair value	$	—	$	2,169.1	$	—	$	—		$	2,169.1
Short-term investments, at amortized cost (which approximates fair value)	2.5		108.1		1.5		—			112.1
Common equity securities, at fair value	—		188.7		—		—			188.7
Other investments	—		150.5		—		—			150.5
Total investment securities	2.5		2,616.4		1.5		—			2,620.4
Cash	—		69.5		0.1		—			69.6
Reinsurance recoverables	—		179.5		—		—			179.5
Premiums receivable	—		228.3		—		—			228.3
Deferred acquisition costs	—		96.3		—		—			96.3
Ceded unearned premiums	—		44.2		—		—			44.2
Net deferred tax asset	—		126.6		—		0.1			126.7
Investment income accrued	—		11.3		—		—			11.3
Accounts receivable on unsettled investment sales	—		1.4		—		—			1.4
Investments in subsidiaries	1,018.8		—		989.4		(2,008.2		)	—
Other assets	0.4		211.4		0.4		—			212.2
Total assets	$	1,021.7	$	3,584.9	$	991.4	$	(2,008.1	)	$	3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves	$	—	$	1,365.6	$	—	$	—		$	1,365.6
Unearned premiums	—		575.1		—		—			575.1
Funds held under insurance contracts	—		153.0		—		—			153.0
Debt	—		—		273.2		—			273.2
Other liabilities	0.4		190.6		6.8		—			197.8
Total liabilities	0.4		2,284.3		280.0		—			2,564.7
OneBeacon's common shareholders' equity and noncontrolling interests
Total OneBeacon's common shareholders' equity	1,021.3		1,296.7		711.4		(2,008.1		)	1,021.3
Total noncontrolling interests	—		3.9		—		—			3.9
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,021.3		1,300.6		711.4		(2,008.1		)	1,025.2
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$	1,021.7	$	3,584.9	$	991.4	$	(2,008.1	)	$	3,589.9

Consolidating Statement of Operations and Comprehensive Income

Consolidating Statement of Operations and Comprehensive Income (Loss) Three months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	277.4		$	—		$	—		$	277.4
Net investment income	—			14.5			—			—			14.5
Net realized and change in unrealized investment gains	—			12.3			—			—			12.3
Net other revenues	—			2.1			—			—			2.1
Total revenues	—			306.3			—			—			306.3
Expenses
Loss and loss adjustment expenses	—			188.6			—			—			188.6
Policy acquisition expenses	—			48.4			—			—			48.4
Other underwriting expenses	—			59.6			—			—			59.6
General and administrative expenses	6.5			2.2			0.1			—			8.8
Interest expense	—			—			3.3			—			3.3
Total expenses	6.5			298.8			3.4			—			308.7
Pre-tax income (loss)	(6.5		)	7.5			(3.4		)	—			(2.4		)
Income tax benefit	—			1.5			1.2			—			2.7
Income (loss) before equity in earnings of unconsolidated affiliates	(6.5		)	9.0			(2.2		)	—			0.3
Equity in earnings of subsidiaries, net of tax	6.4			—			0.5			(6.9		)	—
Net income including noncontrolling interests	(0.1		)	9.0			(1.7		)	(6.9		)	0.3
Less: Net income attributable to noncontrolling interests	—			(0.4		)	—			—			(0.4		)
Net income (loss) attributable to OneBeacon's common shareholders	(0.1		)	8.6			(1.7		)	(6.9		)	(0.1		)
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	0.1		$	8.6		$	(1.5	)	$	(7.1	)	$	0.1

Consolidating Statement of Operations and Comprehensive Income Three months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	271.4		$	—		$	—		$	271.4
Net investment income	—			12.1			—			—			12.1
Net realized and change in unrealized investment gains	—			24.7			—			—			24.7
Net other revenues	—			0.8			—			—			0.8
Total revenues	—			309.0			—			—			309.0
Expenses
Loss and loss adjustment expenses	—			179.7			—			—			179.7
Policy acquisition expenses	—			48.7			—			—			48.7
Other underwriting expenses	—			50.9			—			—			50.9
General and administrative expenses	1.2			2.1			0.2			—			3.5
Interest expense	—			—			3.2			—			3.2
Total expenses	1.2			281.4			3.4			—			286.0
Pre-tax income (loss)	(1.2		)	27.6			(3.4		)	—			23.0
Income tax benefit	—			—			2.0			—			2.0
Net income (loss) before equity in earnings of unconsolidated affiliates	(1.2		)	27.6			(1.4		)	—			25.0
Equity in earnings of subsidiaries, net of tax	25.7			—			18.0			(43.7		)	—
Net income including noncontrolling interests	24.5			27.6			16.6			(43.7		)	25.0
Less: Net income attributable to noncontrolling interests	—			(0.5		)	—			—			(0.5		)
Net income attributable to OneBeacon's common shareholders	24.5			27.1			16.6			(43.7		)	24.5
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	24.7		$	27.1		$	16.8		$	(43.9	)	$	24.7

Consolidating Statement of Operations and Comprehensive Income Six months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	539.2		$	—		$	—		$	539.2
Net investment income	—			26.7			—			—			26.7
Net realized and change in unrealized investment gains	—			27.3			—			—			27.3
Net other revenues	—			5.5			—			—			5.5
Total revenues	—			598.7			—			—			598.7
Expenses
Loss and loss adjustment expenses	—			339.2			—			—			339.2
Policy acquisition expenses	—			93.7			—			—			93.7
Other underwriting expenses	—			111.3			—			—			111.3
General and administrative expenses	9.4			4.2			0.2			—			13.8
Interest expense	—			—			6.6			—			6.6
Total expenses	9.4			548.4			6.8			—			564.6
Pre-tax income (loss)	(9.4		)	50.3			(6.8		)	—			34.1
Income tax benefit (expense)	—			(3.8		)	2.6			—			(1.2		)
Net income (loss) before equity in earnings of unconsolidated affiliates	(9.4		)	46.5			(4.2		)	—			32.9
Equity in earnings of subsidiaries, net of tax	41.4			—			11.7			(53.1		)	—
Net income including noncontrolling interests	32.0			46.5			7.5			(53.1		)	32.9
Less: Net income attributable to noncontrolling interests	—			(0.9		)	—			—			(0.9		)
Net income attributable to OneBeacon's common shareholders	32.0			45.6			7.5			(53.1		)	32.0
Other comprehensive income, net of tax	0.3			—			0.3			(0.3		)	0.3
Comprehensive income attributable to OneBeacon's common shareholders	$	32.3		$	45.6		$	7.8		$	(53.4	)	$	32.3

Consolidating Statement of Operations and Comprehensive Income Six months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Revenues
Earned premiums	$	—		$	550.0		$	—		$	—		$	550.0
Net investment income	—			26.5			—			—			26.5
Net realized and change in unrealized investment gains	—			41.3			—			—			41.3
Net other revenues	—			1.7			—			—			1.7
Total revenues	—			619.5			—			—			619.5
Expenses
Loss and loss adjustment expenses	—			338.5			—			—			338.5
Policy acquisition expenses	—			99.7			—			—			99.7
Other underwriting expenses	—			106.2			—			—			106.2
General and administrative expenses	2.4			4.8			0.2			—			7.4
Interest expense	—			—			6.5			—			6.5
Total expenses	2.4			549.2			6.7			—			558.3
Pre-tax income (loss)	(2.4		)	70.3			(6.7		)	—			61.2
Income tax benefit	—			7.1			3.6			—			10.7
Net income (loss) before equity in earnings of unconsolidated affiliates	(2.4		)	77.4			(3.1		)	—			71.9
Equity in earnings of subsidiaries, net of tax	73.3			—			40.7			(114.0		)	—
Net income including noncontrolling interests	70.9			77.4			37.6			(114.0		)	71.9
Less: Net income attributable to noncontrolling interests	—			(1.0		)	—			—			(1.0		)
Net income attributable to OneBeacon's common shareholders	70.9			76.4			37.6			(114.0		)	70.9
Other comprehensive income, net of tax	0.2			—			0.2			(0.2		)	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$	71.1		$	76.4		$	37.8		$	(114.2	)	$	71.1

Consolidating Statement of Cash Flows

Consolidating Statement of Cash Flows Six months ended June 30, 2017 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Cash flows from operations:
Net income including noncontrolling interests	$	32.0		$	46.5		$	7.5		$	(53.1	)	$	32.9
Charges (credits) to reconcile net income to cash flows provided from (used for) operations:
Undistributed earnings from subsidiaries	(41.4		)	—			(11.7		)	53.1			—
Net realized and change in unrealized investment gains	—			(27.3		)	—			—			(27.3		)
Deferred income tax benefit	—			(2.6		)	—			—			(2.6		)
Dividends received from subsidiaries	45.0			—			—			(45.0		)	—
Other operating items:
Net change in loss and LAE reserves	—			45.6			—			—			45.6
Net change in unearned premiums	—			20.1			—			—			20.1
Net change in ceded unearned premiums	—			(12.4		)	—			—			(12.4		)
Net change in premiums receivable	—			(17.1		)	—			—			(17.1		)
Net change in reinsurance recoverables on paid and unpaid losses	—			(18.5		)	—			—			(18.5		)
Net change in funds held under insurance contracts	—			57.2			—			—			57.2
Net change in other assets and liabilities	8.2			2.5			(2.4		)	—			8.3
Net cash provided from (used for) operations	43.8			94.0			(6.6		)	(45.0		)	86.2
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	(2.9		)	63.9			(4.4		)	—			56.6
Maturities of fixed maturity investments	—			158.6			—			—			158.6
Sales of fixed maturity investments	—			686.1			—			—			686.1
Sales of common equity securities	—			5.8			—			—			5.8
Return of capital and distributions of other investments	—			13.5			—			—			13.5
Purchases of fixed maturity investments	—			(957.9		)	—			—			(957.9		)
Purchases of common equity securities	—			(6.2		)	—			—			(6.2		)
Contributions for other investments	—			(0.9		)	—			—			(0.9		)
Net change in unsettled investment purchases and sales	—			4.8			—			—			4.8
Net acquisitions of property and equipment	—			(4.0		)	—			—			(4.0		)
Capital contribution from parent	—			23.5			34.5			(58.0		)	—
Net cash provided from (used for) investing activities	(2.9		)	(12.8		)	30.1			(58.0		)	(43.6		)
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.8		)	—			—			—			(39.8		)
Cash dividends paid to parent	—			(45.0		)	—			45.0			—
Capital contribution to subsidiary	—			(34.5		)	(23.5		)	58.0			—
Repurchases and retirements of common stock	(1.1		)	—			—			—			(1.1		)
Payments on capital lease obligation	—			—			—			—			—
Net cash used for financing activities	(40.9		)	(79.5		)	(23.5		)	103.0			(40.9		)
Net increase in cash during period	—			1.7			—			—			1.7
Cash balance at beginning of period	—			69.5			0.1			—			69.6
Cash balance at end of period	$	—		$	71.2		$	0.1		$	—		$	71.3

Consolidating Statement of Cash Flows Six months ended June 30, 2016 (in millions)	The Company (guarantor)			Non-guarantor subsidiaries			OBH (issuer)			Consolidating adjustments			Consolidated
Cash flows from operations:
Net income including noncontrolling interests	$	70.9		$	77.4		$	37.6		$	(114.0	)	$	71.9
Charges (credits) to reconcile net income to cash flows provided from (used for) operations:
Undistributed earnings from subsidiaries	(73.3		)	—			(40.7		)	114.0			—
Net realized and change in unrealized investment gains	—			(41.3		)	—			—			(41.3		)
Deferred income tax expense	—			19.2			—			—			19.2
Dividends received from subsidiaries	51.0			—			—			(51.0		)	—
Other operating items:
Net change in loss and LAE reserves	—			(13.2		)	—			—			(13.2		)
Net change in unearned premiums	—			(3.9		)	—			—			(3.9		)
Net change in ceded unearned premiums	—			(5.0		)	—			—			(5.0		)
Net change in premiums receivable	—			(19.9		)	—			—			(19.9		)
Net change in reinsurance recoverables on paid and unpaid losses	—			10.0			—			—			10.0
Net change in funds held under insurance contracts	—			3.2			—			—			3.2
Net change in other assets and liabilities	1.2			(35.4		)	(4.1		)	—			(38.3		)
Net cash provided from (used for) operations	49.8			(8.9		)	(7.2		)	(51.0		)	(17.3		)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	1.3			(47.8		)	1.1			—			(45.4		)
Maturities of fixed maturity investments	—			229.5			—			—			229.5
Sales of fixed maturity investments	—			218.8			24.2			(42.5		)	200.5
Sales of common equity securities	—			174.4			—			—			174.4
Return of capital and distributions of other investments	—			7.0			—			—			7.0
Purchases of fixed maturity investments	—			(473.6		)	(18.3		)	42.5			(449.4		)
Purchases of common equity securities	—			(109.5		)	—			—			(109.5		)
Contributions for other investments	—			(0.4		)	—			—			(0.4		)
Net change in unsettled investment purchases and sales	—			42.5			—			—			42.5
Net acquisitions of property and equipment	—			(2.1		)	—			—			(2.1		)
Capital contribution from parent	—			27.3			28.5			(55.8		)	—
Net cash provided from investing activities	1.3			66.1			35.5			(55.8		)	47.1
Cash flows from financing activities:
Cash dividends paid to common shareholders	(39.6		)	—			—			—			(39.6		)
Cash dividends paid to parent	—			(51.0		)	—			51.0			—
Capital contribution to subsidiary	—			(28.5		)	(27.3		)	55.8			—
Repurchases and retirements of common stock	(11.5		)	—			—			—			(11.5		)
Payments on capital lease obligation	—			(1.0		)	—			—			(1.0		)
Net cash used for financing activities	(51.1		)	(80.5		)	(27.3		)	106.8			(52.1		)
Net increase (decrease) in cash during period	—			(23.3		)	1.0			—			(22.3		)
Cash balance at beginning of period	—			94.6			0.6			—			95.2
Cash balance at end of period	$	—		$	71.3		$	1.6		$	—		$	72.9

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Nature of Operations and Summary of Significant Accounting Policies (Details)	6 Months Ended
	Jun. 30, 2017 segment
Basis of presentation
Number of underwriting segments	16
White Mountains Insurance Group Ltd
Basis of presentation
Ownership interest (as a percent)	75.70%
Specialty Products
Basis of presentation
Number of underwriting segments	10
Specialty Industries
Basis of presentation
Number of underwriting segments	6

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OneBeacon Acquisition (Details) - OneBeacon Insurance Company $ / shares in Units, $ in Billions	May 02, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Business Acquisition, Share Price | $ / shares	$ 18.10
Payments to Acquire Businesses, Gross | $	$ 1.7

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Unpaid Loss and Loss Adjustment Expense (LAE) Reserves - Summary of Loss and LAE Reserves (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross beginning balance	$ 1,368.8	$ 1,343.8	$ 1,365.6	$ 1,389.8
Less beginning reinsurance recoverables on unpaid losses	(174.7)	(150.4)	(172.9)	(186.0)
Net beginning loss and LAE reserves	1,194.1	1,193.4	1,192.7	1,203.8
Loss and LAE incurred relating to:
Current year losses	181.3	164.3	331.9	323.1
Prior year losses	7.3	15.4	7.3	15.4
Total incurred loss and LAE	188.6	179.7	339.2	338.5
Current year losses	(36.4)	(37.1)	(57.7)	(59.1)
Prior year losses	(132.1)	(122.2)	(260.0)	(269.4)
Total loss and LAE payments	(168.5)	(159.3)	(317.7)	(328.5)
Net ending loss and LAE reserves	1,214.2	1,213.8	1,214.2	1,213.8
Plus ending reinsurance recoverables on unpaid losses	(197.0)	(162.8)	(197.0)	(162.8)
Gross ending loss and LAE reserves	$ 1,411.2	$ 1,376.6	$ 1,411.2	$ 1,376.6

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Unpaid Loss and Loss Adjustment Expense (LAE) Reserves (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year losses	$ 7.3	$ 15.4	$ 7.3	$ 15.4
Other Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year losses		$ 24.0	$ 34.8

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Reinsurance (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Reinsurance Retention Policy [Line Items]
Reinsurance recoverables on paid losses	$ 1.0
Reinsurance recoverable on unpaid losses	197.0	$ 174.7	$ 172.9	$ 162.8	$ 150.4	$ 186.0
Reinsurance recoverables	$ 198.0		$ 179.5
Percentage of total paid and unpaid reinsurance recoverables	100.00%
Runoff
Reinsurance Retention Policy [Line Items]
Reinsurance Recoverables on Unpaid Losses	$ 17.2
A plus or better
Reinsurance Retention Policy [Line Items]
Reinsurance recoverables	$ 85.9
Percentage of total paid and unpaid reinsurance recoverables	43.00%
A minus to A
Reinsurance Retention Policy [Line Items]
Reinsurance recoverables	$ 83.4
Percentage of total paid and unpaid reinsurance recoverables	42.00%
B, Not Rated and Other
Reinsurance Retention Policy [Line Items]
Reinsurance recoverables	$ 28.7
Percentage of total paid and unpaid reinsurance recoverables	15.00%

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Investment Securities (Net investment income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 2,619.4	$ 2,490.7	$ 2,619.4	$ 2,490.7	$ 2,489.9	$ 2,496.0	$ 2,428.3	$ 2,507.5
Gross Investment Income	15.5	13.3	29.0	28.9
Less investment expenses	(1.0)	(1.2)	(2.3)	(2.4)
Net investment income, pre-tax	14.5	12.1	26.7	26.5
Surplus notes
Schedule of Trading Securities and Other Trading Assets [Line Items]
Proceeds from Interest Received				2.4
Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross Investment Income	14.1	12.2	26.7	24.3
Short-term investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross Investment Income	0.1	0.1	0.2	0.1
Common equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross Investment Income	0.9	0.5	1.7	1.5
Other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Gross Investment Income	$ 0.4	$ 0.5	$ 0.4	$ 3.0

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Investment Securities (Net realized investment gains (losses)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	$ 0.5	$ 1.1	$ 0.9	$ (4.8)
Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	0.8	0.4	(0.3)	(1.0)
Common equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	0.7	3.7	1.0	(1.0)
Other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	$ (1.0)	$ (3.0)	$ 0.2	$ (2.8)

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Investment Securities (Changes in fair value) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Total net changes in fair value reflected in revenues
Changes in net unrealized investment gains (losses)	$ 9.9	$ 23.6	$ 24.4	$ 46.1
Changes in net foreign currency translation gains (losses)	1.9	0.0	2.0	0.0
Total net changes in fair value reflected in revenues	11.8	23.6	26.4	46.1
Fixed maturity investments
Total net changes in fair value reflected in revenues
Changes in net unrealized investment gains (losses)	4.8	12.0	12.1	27.0
Changes in net foreign currency translation gains (losses)	1.9	0.0	2.0	0.0
Total net changes in fair value reflected in revenues	6.7	12.0	14.1	27.0
Common equity securities
Total net changes in fair value reflected in revenues
Changes in net unrealized investment gains (losses)	5.2	(5.4)	15.3	4.3
Changes in net foreign currency translation gains (losses)	0.0	0.0	0.0	0.0
Total net changes in fair value reflected in revenues	5.2	(5.4)	15.3	4.3
Other investments
Total net changes in fair value reflected in revenues
Changes in net unrealized investment gains (losses)	(0.1)	17.0	(3.0)	14.8
Changes in net foreign currency translation gains (losses)	0.0	0.0	0.0	0.0
Total net changes in fair value reflected in revenues	$ (0.1)	$ 17.0	$ (3.0)	$ 14.8

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Investment Securities (Net unrealized investment gains and losses) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Investments [Abstract]
Trading Securities Gross Unrealized Gain	$ 72.2	$ 52.7
Trading Securities Gross Unrealized Loss	(7.1)	(12.0)
Gross Unrealized Gains (Losses) on Trading Securities Pretax	65.1	40.7
Trading Securities, Unrealized Gains and Losses, Tax	(20.4)	(14.0)
Unrealized gains (losses) on trading securities, net of tax	$ 44.7	$ 26.7

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Investment Securities (Fixed maturity investment gains and losses) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities Gross Unrealized Gain	$ 72.2	$ 52.7
Gross unrealized losses	(7.1)	(12.0)
Carrying Value	2,288.6	2,169.1
U.S. Government and agency obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	56.0	169.6
Trading Securities Gross Unrealized Gain	0.0	0.0
Gross unrealized losses	(0.3)	(2.3)
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	55.7	167.3
Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	892.7	760.6
Trading Securities Gross Unrealized Gain	9.6	6.2
Gross unrealized losses	(0.7)	(3.7)
Net unrealized foreign currency gains (losses)	2.0	0.0
Carrying Value	903.6	763.1
Municipal obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	69.7	70.1
Trading Securities Gross Unrealized Gain	1.3	0.8
Gross unrealized losses	(0.4)	(0.4)
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	70.6	70.5
Mortgage and asset-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	1,238.8	1,154.8
Trading Securities Gross Unrealized Gain	3.7	1.8
Gross unrealized losses	(2.4)	(3.5)
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	1,240.1	1,153.1
Foreign government obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	4.3	1.0
Trading Securities Gross Unrealized Gain	0.1	0.2
Gross unrealized losses	0.0	0.0
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	4.4	1.2
Preferred stocks
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	8.3	8.3
Trading Securities Gross Unrealized Gain	5.9	5.6
Gross unrealized losses	0.0	0.0
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	14.2	13.9
Total fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	2,269.8	2,164.4
Trading Securities Gross Unrealized Gain	20.6	14.6
Gross unrealized losses	(3.8)	(9.9)
Net unrealized foreign currency gains (losses)	2.0	0.0
Carrying Value	$ 2,288.6	$ 2,169.1

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Investment Securities (Convertible fixed maturity investments and other investments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Funds held under insurance contracts	$ 210.2	$ 153.0
Trading Securities Gross Unrealized Gain	72.2	52.7
Gross unrealized losses	(7.1)	(12.0)
Carrying Value	2,288.6	2,169.1
Common equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	183.8	182.3
Trading Securities Gross Unrealized Gain	22.5	6.9
Gross unrealized losses	(0.8)	(0.5)
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	205.5	188.7
Other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	107.5	120.9
Trading Securities Gross Unrealized Gain	29.1	31.2
Gross unrealized losses	(2.5)	(1.6)
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	134.1	150.5
Total common equity securities and other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or amortized cost	291.3	303.2
Trading Securities Gross Unrealized Gain	51.6	38.1
Gross unrealized losses	(3.3)	(2.1)
Net unrealized foreign currency gains (losses)	0.0	0.0
Carrying Value	$ 339.6	$ 339.2

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Investment Securities (Fair value measurements) (Details) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017 USD ($) fund	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($) fund	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) fund	Dec. 31, 2015 USD ($)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	$ 0.5		$ 1.1		$ 0.9	$ (4.8)
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	134.1				134.1		$ 150.5
Other investments at fair value	122.8				122.8		138.2
Fair value of investments	$ 2,619.4	$ 2,489.9	2,490.7	$ 2,428.3	$ 2,619.4	2,490.7	$ 2,496.0	$ 2,507.5
Percentage of Fair Value Investments Using Observable Inputs	95.00%				95.00%		95.00%
Maximum Percentage Differences Between Prices Provided by Pricing Services Considered Outliers	5.00%				5.00%
Maximum Differences Between Prices Provided By Pricing Services Considered Outliers	$ 1.0				$ 1.0
Transfers out	47.2	0.0	0.0	0.0
Transfers in	47.2	0.0	0.0	0.0
Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	236.3	230.4	269.6	308.7	236.3	269.6	$ 333.1	363.3
Transfers out	0.0	0.0	0.0	0.0
Transfers in	0.0	0.0	0.0	0.0
Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2,243.5	2,088.0	2,002.2	1,925.4	2,243.5	2,002.2	2,024.7	1,945.9
Transfers out	0.0	0.0	0.0	0.0
Transfers in	47.2	0.0	0.0	0.0
Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Transfers out						0.0
Transfers in					0.0	0.0
Hedge funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value adjustment	1.1				1.1		5.0
Other investments at fair value	$ 18.2				$ 18.2		$ 18.4
Number of Investments | fund	4				4		4
Private equity funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	$ 22.4				$ 22.4		$ 33.6
Number of Investments | fund	14				14		17
Community reinvestment vehicle
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	$ 14.2				$ 14.2		$ 14.3
Single Fund
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	16.1				16.1		15.0
Tax development fund
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	11.3		13.4		11.3	13.4	12.3
Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	903.6				903.6		763.1
Mortgage and asset-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1,240.1				1,240.1		1,153.1
Mortgage and asset-backed securities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1,227.4				1,227.4		1,153.1
Mortgage and asset-backed securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	12.7				12.7		0.0
Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	145.8				145.8		123.6
Commercial Mortgage Backed Securities [Member] | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	140.8				140.8		123.6
Commercial Mortgage Backed Securities [Member] | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	5.0				5.0		0.0
Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	0.8		0.4		(0.3)	(1.0)
Fixed maturity investments | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	14.3	47.2	85.1	70.5	14.3	85.1	0.0	70.0
Transfers out	47.2	0.0	0.0	0.0
Transfers in	0.0	0.0	0.0	0.0
Common equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	0.7		3.7		1.0	(1.0)
Hedge funds and private equity funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	40.6				40.6		$ 52.0
Other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Net realized investment gains (losses), pre-tax	$ (1.0)		(3.0)		$ 0.2	(2.8)
Investments, Percent of Total	5.00%				5.00%		5.00%
Other investments | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 84.7	84.1	77.1	66.2	$ 84.7	77.1	$ 86.2	65.8
Transfers out	0.0	0.0	0.0	0.0
Transfers in	0.0	0.0	0.0	0.0
Surplus notes
Schedule of Trading Securities and Other Trading Assets [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Fair Value	70.5				70.5		71.9
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations	101.0				101.0		101.0
Foreign currency forward contract
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	(2.5)				(2.5)		0.0
Residential Mortgage Backed Securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Transfers out					47.2
Recurring basis
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2,634.3				2,634.3		2,556.1
Recurring basis | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	291.8				291.8		445.2
Recurring basis | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2,243.5				2,243.5		2,024.7
Recurring basis | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	99.0				99.0		86.2
Recurring basis | U.S. Government and agency obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	55.7				55.7		167.3
Recurring basis | U.S. Government and agency obligations | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	55.7				55.7		167.3
Recurring basis | U.S. Government and agency obligations | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | U.S. Government and agency obligations | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	903.6				903.6		763.1
Recurring basis | Debt securities issued by corporations | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	902.0				902.0		763.1
Recurring basis | Debt securities issued by corporations | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1.6				1.6		0.0
Recurring basis | Debt securities issued by corporations | Consumer
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	187.3				187.3		194.8
Recurring basis | Debt securities issued by corporations | Consumer | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Consumer | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	187.3				187.3		194.8
Recurring basis | Debt securities issued by corporations | Consumer | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Health Care
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	122.3				122.3		129.2
Recurring basis | Debt securities issued by corporations | Health Care | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Health Care | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	122.3				122.3		129.2
Recurring basis | Debt securities issued by corporations | Health Care | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Industrial
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	141.6				141.6		118.2
Recurring basis | Debt securities issued by corporations | Industrial | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Industrial | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	140.0				140.0		118.2
Recurring basis | Debt securities issued by corporations | Industrial | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1.6				1.6		0.0
Recurring basis | Debt securities issued by corporations | Financials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	154.9				154.9		96.3
Recurring basis | Debt securities issued by corporations | Financials | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Financials | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	154.9				154.9		96.3
Recurring basis | Debt securities issued by corporations | Financials | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Communications
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	58.4				58.4		59.4
Recurring basis | Debt securities issued by corporations | Communications | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Communications | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	58.4				58.4		59.4
Recurring basis | Debt securities issued by corporations | Communications | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Energy
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	42.0				42.0		47.4
Recurring basis | Debt securities issued by corporations | Energy | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Energy | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	42.0				42.0		47.4
Recurring basis | Debt securities issued by corporations | Energy | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Utilities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	81.9				81.9		39.5
Recurring basis | Debt securities issued by corporations | Utilities | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Utilities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	81.9				81.9		39.5
Recurring basis | Debt securities issued by corporations | Utilities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Technology
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	63.8				63.8		40.7
Recurring basis | Debt securities issued by corporations | Technology | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Technology | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	63.8				63.8		40.7
Recurring basis | Debt securities issued by corporations | Technology | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Basic materials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	51.4				51.4		37.6
Recurring basis | Debt securities issued by corporations | Basic materials | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Debt securities issued by corporations | Basic materials | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	51.4				51.4		37.6
Recurring basis | Debt securities issued by corporations | Basic materials | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Municipal obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	70.6				70.6		70.5
Recurring basis | Municipal obligations | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Municipal obligations | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	70.6				70.6		70.5
Recurring basis | Municipal obligations | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Mortgage and asset-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1,240.1				1,240.1		1,153.1
Recurring basis | Mortgage and asset-backed securities | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Mortgage and asset-backed securities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1,227.4				1,227.4		1,153.1
Recurring basis | Mortgage and asset-backed securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	12.7				12.7		0.0
Recurring basis | Foreign government obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	4.4				4.4		1.2
Recurring basis | Foreign government obligations | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.6				0.6		0.6
Recurring basis | Foreign government obligations | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.8				3.8		0.6
Recurring basis | Foreign government obligations | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Preferred stocks
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	14.2				14.2		13.9
Recurring basis | Preferred stocks | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Preferred stocks | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	14.2				14.2		13.9
Recurring basis | Preferred stocks | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2,288.6				2,288.6		2,169.1
Recurring basis | Fixed maturity investments | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	56.3				56.3		167.9
Recurring basis | Fixed maturity investments | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2,218.0				2,218.0		2,001.2
Recurring basis | Fixed maturity investments | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	14.3				14.3		0.0
Recurring basis | Short-term investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	55.5				55.5		112.1
Recurring basis | Short-term investments | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	55.5				55.5		112.1
Recurring basis | Short-term investments | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Short-term investments | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	205.5				205.5		188.7
Recurring basis | Common equity securities | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	180.0				180.0		165.2
Recurring basis | Common equity securities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	25.5				25.5		23.5
Recurring basis | Common equity securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Consumer
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	4.8				4.8		4.3
Recurring basis | Common equity securities | Consumer | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	4.8				4.8		4.3
Recurring basis | Common equity securities | Consumer | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Consumer | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Health Care
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	6.2				6.2		7.0
Recurring basis | Common equity securities | Health Care | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	6.2				6.2		7.0
Recurring basis | Common equity securities | Health Care | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Health Care | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Industrial
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.3				3.3		0.7
Recurring basis | Common equity securities | Industrial | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.3				3.3		0.7
Recurring basis | Common equity securities | Industrial | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Industrial | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Financials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	5.4				5.4		3.9
Recurring basis | Common equity securities | Financials | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	5.4				5.4		3.9
Recurring basis | Common equity securities | Financials | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments							0.0
Recurring basis | Common equity securities | Financials | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments							0.0
Recurring basis | Common equity securities | Communications
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.3				3.3		3.5
Recurring basis | Common equity securities | Communications | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.3				3.3		3.5
Recurring basis | Common equity securities | Communications | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Communications | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Energy
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1.3				1.3		1.2
Recurring basis | Common equity securities | Energy | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1.3				1.3		1.2
Recurring basis | Common equity securities | Energy | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Energy | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Technology
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.3				3.3		3.7
Recurring basis | Common equity securities | Technology | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.3				3.3		3.7
Recurring basis | Common equity securities | Technology | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Technology | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Common equity securities | Exchange Traded Funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	177.9				177.9		164.4
Recurring basis | Common equity securities | Exchange Traded Funds | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	152.4				152.4		140.9
Recurring basis | Common equity securities | Exchange Traded Funds | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	25.5				25.5		23.5
Recurring basis | Common equity securities | Exchange Traded Funds | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	84.7				84.7		86.2
Recurring basis | Other investments | Level 1
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Other investments | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0				0.0		0.0
Recurring basis | Other investments | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	84.7				84.7		86.2
Runoff
Schedule of Trading Securities and Other Trading Assets [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations	101.0				101.0
NAV Valuation Technique
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	40.2		56.7	57.5	40.2	$ 56.7	52.0	$ 62.5
Transfers out	0.0	0.0	0.0	0.0
Transfers in	0.0	$ 0.0	$ 0.0	$ 0.0
NAV Valuation Technique | Hedge funds and private equity funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	40.6				40.6		$ 52.0
Not Designated as Hedging Instrument | Foreign currency forward contract
Schedule of Trading Securities and Other Trading Assets [Line Items]
Foreign currency forward fair value	(2.5)				(2.5)
Not Designated as Hedging Instrument | Foreign currency forward contract | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Foreign currency forward fair value	$ (2.5)				$ (2.5)

XML

Investment Securities (Corporate debt securities) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	$ 2,619.4	$ 2,489.9	$ 2,496.0	$ 2,490.7	$ 2,428.3	$ 2,507.5
Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	903.6		763.1
AA | Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	62.6		63.7
A | Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	255.7		169.1
BBB | Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	491.4		450.8
BB | Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	87.0		70.8
B | Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	6.9		8.7
Recurring basis
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	2,634.3		2,556.1
Recurring basis | Debt securities issued by corporations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Debt securities issued by corporations	$ 903.6		$ 763.1

XML

Investment Securities (Fair value rollforward) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investment securities
Changes in net unrealized investment gains (losses)	$ 9.9		$ 23.6		$ 24.4	$ 46.1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,489.9	$ 2,496.0	2,428.3	$ 2,507.5	2,496.0	2,507.5
Amortization/accretion	(3.4)	(4.1)	(2.9)	(3.2)
Total net realized and unrealized gains (losses)	14.6	15.2	24.7	16.6
Purchases	368.5	596.6	273.8	285.6
Sales	(250.2)	(613.8)	(233.2)	(378.2)
Transfers in	47.2	0.0	0.0	0.0
Transfers out	(47.2)	0.0	0.0	0.0
Ending Balance	2,619.4	2,489.9	2,490.7	2,428.3	2,619.4	2,490.7
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	134.1				134.1		$ 150.5
Level 3
Investment securities
Changes in net unrealized investment gains (losses)	0.6		11.6		(1.4)	12.5
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers in					0.0	0.0
Transfers out						0.0
Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	230.4	333.1	308.7	363.3	333.1	363.3
Amortization/accretion	0.0	0.0	0.0	0.0
Total net realized and unrealized gains (losses)	5.1	9.4	(2.1)	5.6
Purchases	5.4	9.3	38.5	98.2
Sales	(4.6)	(121.4)	(75.5)	(158.4)
Transfers in	0.0	0.0	0.0	0.0
Transfers out	0.0	0.0	0.0	0.0
Ending Balance	236.3	230.4	269.6	308.7	236.3	269.6
Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,088.0	2,024.7	1,925.4	1,945.9	2,024.7	1,945.9
Amortization/accretion	(3.4)	(4.1)	(2.9)	(3.2)
Total net realized and unrealized gains (losses)	8.3	7.2	12.1	12.5
Purchases	348.7	539.4	221.2	187.0
Sales	(245.3)	(479.2)	(153.6)	(216.8)
Transfers in	47.2	0.0	0.0	0.0
Transfers out	0.0	0.0	0.0	0.0
Ending Balance	2,243.5	2,088.0	2,002.2	1,925.4	2,243.5	2,002.2
Tax development fund
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Other investments, at fair value (cost: $107.5 in 2017 and $120.9 in 2016)	11.3		13.4		11.3	13.4	$ 12.3
Residential Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		135.0			135.0
Ending Balance	218.5				218.5
Residential Mortgage Backed Securities [Member] | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		0.0			0.0
Ending Balance	7.7				7.7
Residential Mortgage Backed Securities [Member] | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		135.0			135.0
Ending Balance	210.8				210.8
Commercial Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		123.6			123.6
Ending Balance	145.8				145.8
Commercial Mortgage Backed Securities [Member] | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		0.0			0.0
Ending Balance	5.0				5.0
Commercial Mortgage Backed Securities [Member] | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		123.6			123.6
Ending Balance	140.8				140.8
Mortgage and asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		1,153.1			1,153.1
Ending Balance	1,240.1				1,240.1
Mortgage and asset-backed securities | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		0.0			0.0
Ending Balance	12.7				12.7
Mortgage and asset-backed securities | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		1,153.1			1,153.1
Ending Balance	1,227.4				1,227.4
Debt securities issued by corporations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		763.1			763.1
Ending Balance	903.6				903.6
Other investments
Investment securities
Changes in net unrealized investment gains (losses)	$ (0.1)		17.0		$ (3.0)	14.8
Investments, Percent of Total	5.00%				5.00%		5.00%
Other investments | Level 3
Investment securities
Changes in net unrealized investment gains (losses)	$ 0.6		10.9		$ (1.5)	11.3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	84.1	86.2	66.2	65.8	86.2	65.8
Amortization/accretion	0.0	0.0	0.0	0.0
Total net realized and unrealized gains (losses)	0.6	(2.1)	10.9	0.4
Purchases	0.0	0.0	0.0	0.0
Sales	0.0	0.0	0.0	0.0
Transfers in	0.0	0.0	0.0	0.0
Transfers out	0.0	0.0	0.0	0.0
Ending Balance	84.7	84.1	77.1	66.2	84.7	77.1
Fixed maturity investments
Investment securities
Changes in net unrealized investment gains (losses)	4.8		12.0		12.1	27.0
Fixed maturity investments | Level 3
Investment securities
Changes in net unrealized investment gains (losses)	0.0		0.7		0.1	1.2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	47.2	0.0	70.5	70.0	0.0	70.0
Amortization/accretion	0.0	0.0	0.0	0.0
Total net realized and unrealized gains (losses)	0.0	0.1	0.7	0.5
Purchases	14.3	47.1	13.9	0.0
Sales	0.0	0.0	0.0	0.0
Transfers in	0.0	0.0	0.0	0.0
Transfers out	(47.2)	0.0	0.0	0.0
Ending Balance	14.3	47.2	85.1	70.5	14.3	85.1
Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		607.9			607.9
Ending Balance	637.1				637.1
Asset-backed securities | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		0.0			0.0
Ending Balance	0.0				0.0
Asset-backed securities | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		607.9			607.9
Ending Balance	637.1				637.1
Residential Mortgage Backed Securities | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers out					(47.2)
NAV Valuation Technique
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		52.0	57.5	62.5	52.0	62.5
Amortization/accretion	0.0	0.0	0.0	0.0
Total net realized and unrealized gains (losses)	0.6	0.6	3.1	(2.4)
Purchases	0.1	0.8	0.2	0.4
Sales	(0.3)	(13.2)	(4.1)	(3.0)
Transfers in	0.0	0.0	0.0	0.0
Transfers out	0.0	$ 0.0	0.0	0.0
Ending Balance	40.2		$ 56.7	$ 57.5	40.2	$ 56.7
Not Designated as Hedging Instrument | Foreign currency forward contract
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Foreign currency forward fair value	(2.5)				(2.5)
Not Designated as Hedging Instrument | Foreign currency forward contract | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Foreign currency forward fair value	$ (2.5)				$ (2.5)

XML

Investment Securities (Significant unobservable inputs) (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) fund	Dec. 31, 2016 USD ($)
Seller priority | Standard Poors N R Rating | Surplus notes | Discounted cash flow
Significant unobservable inputs
Discount Rate	10.60%	9.60%
Fair Value Inputs, Interest Payment Schedule	2020	2020
Fair Value Inputs, Principal Payment Schedule	2030	2030
Increase in credit spread	4.00%	2.50%
Seller priority | Level 3 | Standard Poors N R Rating | Surplus notes | Discounted cash flow
Significant unobservable inputs
Assets, Fair Value Disclosure	$ 48.9	$ 51.1
Pari passu | Standard Poors N R Rating | Surplus notes | Discounted cash flow
Significant unobservable inputs
Discount Rate	15.20%	15.00%
Fair Value Inputs, Interest Payment Schedule	2021	2021
Fair Value Inputs, Principal Payment Schedule	2035	2035
Increase in credit spread	4.00%	2.50%
Pari passu | Level 3 | Standard Poors N R Rating | Surplus notes | Discounted cash flow
Significant unobservable inputs
Assets, Fair Value Disclosure	$ 21.6	$ 20.8
Residential | Level 3 | AAA | Broker Pricing
Significant unobservable inputs
Number of Investments | fund	1
Assets, Fair Value Disclosure	$ 7.7
Broker quote	102.0
Residential | Level 3 | Standard & Poor's, A- Rating | Broker Pricing
Significant unobservable inputs
Assets, Fair Value Disclosure	5.0
Broker quote	100.0
Debt securities issued by corporations | Level 3 | BBB | Broker Pricing
Significant unobservable inputs
Assets, Fair Value Disclosure	1.6
Broker quote	127.5
Community reinvestment vehicle | Standard Poors N R Rating | Member Share of GAAP Net Equity
Significant unobservable inputs
Fair Value Inputs, GAAP Net Equity	14.2	14.3
Community reinvestment vehicle | Level 3 | Standard Poors N R Rating | Member Share of GAAP Net Equity
Significant unobservable inputs
Assets, Fair Value Disclosure	$ 14.2	$ 14.3

XML

Investment Securities (Change in net unrealized gains or losses for Level 3 assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Unrealized gains (losses) on unsold securities	$ 9.9	$ 23.6	$ 24.4	$ 46.1
Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Unrealized gains (losses) on unsold securities	4.8	12.0	12.1	27.0
Other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Unrealized gains (losses) on unsold securities	(0.1)	17.0	(3.0)	14.8
Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Unrealized gains (losses) on unsold securities	0.6	11.6	(1.4)	12.5
Level 3 | Fixed maturity investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Unrealized gains (losses) on unsold securities	0.0	0.7	0.1	1.2
Level 3 | Other investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Unrealized gains (losses) on unsold securities	$ 0.6	$ 10.9	$ (1.5)	$ 11.3

XML

Investment Securities (Asset backed securities) (Details) $ in Millions	Jun. 30, 2017 USD ($) Security Rate	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 2,619.4	$ 2,489.9	$ 2,496.0	$ 2,490.7	$ 2,428.3	$ 2,507.5
Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2,243.5	$ 2,088.0	2,024.7	$ 2,002.2	$ 1,925.4	$ 1,945.9
Fixed rate CMBS
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	126.4
Floating rate CMBS
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	19.4
GNMA
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	170.7		213.5
GNMA | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	170.7		213.5
GNMA | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
FNMA
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	45.7		42.8
FNMA | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	45.7		42.8
FNMA | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
FHLMC
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	22.3		30.3
FHLMC | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	22.3		30.3
FHLMC | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
Agency commercial mortgage-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	238.7		286.6
Agency commercial mortgage-backed securities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	238.7		286.6
Agency commercial mortgage-backed securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
Residential
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	218.5		135.0
Residential | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	210.8		135.0
Residential | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	7.7		0.0
Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	145.8		123.6
Commercial Mortgage Backed Securities [Member] | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	140.8		123.6
Commercial Mortgage Backed Securities [Member] | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	5.0		0.0
Total Non-agency
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	364.3		258.6
Total Non-agency | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	351.6		258.6
Total Non-agency | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	12.7		0.0
Total mortgage-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	603.0		545.2
Total mortgage-backed securities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	590.3		545.2
Total mortgage-backed securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	12.7		0.0
Total mortgage-backed securities | Non-prime
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Credit card receivables
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	266.3		224.3
Credit card receivables | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	266.3		224.3
Credit card receivables | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
Vehicle receivables
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	216.8		273.6
Vehicle receivables | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	216.8		273.6
Vehicle receivables | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
Other
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	154.0		110.0
Other | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	154.0		110.0
Other | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
Total other asset-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	637.1		607.9
Total other asset-backed securities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	637.1		607.9
Total other asset-backed securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0		0.0
Total mortgage and asset-backed securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1,240.1		1,153.1
Total mortgage and asset-backed securities | Level 2
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1,227.4		1,153.1
Total mortgage and asset-backed securities | Level 3
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	12.7		$ 0.0
Collateralized Debt Obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 0.0
Maximum | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Percentage of underlying loans reported as non-performing	0.00%
Residential | Residential
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 218.5
Subordinate | Fixed rate CMBS
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 41.8
Average basis points of subordination | Rate	30.00%
Subordinate | Floating rate CMBS
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 19.4
Subordinate | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	61.2
Subordinate | Residential | Residential
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 0.0
Number of securities | Security	0
Senior | Fixed rate CMBS
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 83.0
Senior | Floating rate CMBS
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Senior | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	83.0
Senior | Residential | Residential
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	172.3
Collateralized Debt Obligations | Senior | Residential
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 23.3

XML

Investment Securities (Non-agency securities) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 2,619.4	$ 2,489.9	$ 2,496.0	$ 2,490.7	$ 2,428.3	$ 2,507.5
Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	218.5		135.0
Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	145.8		123.6
Commercial Mortgage Backed Securities Fixed Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	126.4
Commercial Mortgage Backed Securities Floating Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	19.4
Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	364.3		$ 258.6
Super Senior | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1.6
Super Senior | Commercial Mortgage Backed Securities Fixed Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	1.6
Super Senior | Commercial Mortgage Backed Securities Floating Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Senior | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	83.0
Senior | Commercial Mortgage Backed Securities Fixed Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	83.0
Senior | Commercial Mortgage Backed Securities Floating Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Subordinate | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	61.2
Subordinate | Commercial Mortgage Backed Securities Fixed Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	41.8
Subordinate | Commercial Mortgage Backed Securities Floating Rate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	19.4
Securities Issued in 2004 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	16.8
Securities Issued in 2004 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Securities Issued in 2004 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	16.8
Securities Issued in 2005 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	5.0
Securities Issued in 2005 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Securities Issued in 2005 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	5.0
Securities Issued in 2006 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2.5
Securities Issued in 2006 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Securities Issued in 2006 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2.5
Securities Issued in 2008 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2.3
Securities Issued in 2008 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Securities Issued in 2008 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	2.3
Securities issued in 2010 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	4.7
Securities issued in 2010 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.8
Securities issued in 2010 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	8.5
Securities issued in 2011 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	7.7
Securities issued in 2011 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Securities issued in 2011 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	7.7
Securities issued in 2012 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	3.5
Securities issued in 2012 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	18.1
Securities issued in 2012 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	21.6
Securities Issued in 2013 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	17.4
Securities Issued in 2013 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	11.5
Securities Issued in 2013 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	28.9
Securities Issued in 2014 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	24.9
Securities Issued in 2014 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	23.5
Securities Issued in 2014 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	48.4
Securities Issued in 2015 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	50.0
Securities Issued in 2015 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	43.8
Securities Issued in 2015 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	93.8
Securities Issued in 2016 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	31.0
Securities Issued in 2016 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	21.2
Securities Issued in 2016 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	52.2
Securities Issued in 2017 | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	52.7
Securities Issued in 2017 | Commercial Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	23.9
Securities Issued in 2017 | Total
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	76.6
Residential, Prime, Financing Receivable [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	218.5
Residential, Prime, Financing Receivable [Member] | Super Senior | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	46.2
Residential, Prime, Financing Receivable [Member] | Senior | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	172.3
Residential, Prime, Financing Receivable [Member] | Subordinate | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	0.0
Residential Mortgage Backed Securities [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	218.5
Residential Mortgage Backed Securities [Member] | Super Senior | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	46.2
Residential Mortgage Backed Securities [Member] | Senior | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	172.3
Residential Mortgage Backed Securities [Member] | Subordinate | Residential Mortgage Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of investments	$ 0.0

XML

Investment Securities (Hedge Funds and Private Equity Funds) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments, at fair value	$ 134.1	$ 150.5
Other investments at fair value	122.8	138.2
Surplus notes
Schedule of Trading Securities and Other Trading Assets [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Fair Value	70.5	71.9
Community reinvestment vehicle
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments, at fair value	14.2	14.3
Hedge funds other
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	2.1	3.4
Net asset value per share of unfunded commitments	0.0	0.0
Long/short equity banks and financial
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	16.1	15.0
Net asset value per share of unfunded commitments	0.0	0.0
Hedge funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	18.2	18.4
Net asset value per share of unfunded commitments	0.0	0.0
Distributions from inactive hedge funds	0.0
Redemption requests	2.1
Hedge funds | Redemptions in Lock-Up
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Hedge funds | 30 - 59 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	16.1
Hedge funds | 60 - 89 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Hedge funds | 90 - 119 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	2.1
Hedge funds | Over 120 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Insurance
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.9	0.8
Net asset value per share of unfunded commitments	0.1	0.1
Energy infrastructure and services
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	3.2	14.1
Net asset value per share of unfunded commitments	3.0	3.2
Healthcare
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	3.4	3.5
Net asset value per share of unfunded commitments	0.4	0.4
Multi-sector
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	11.0	11.5
Net asset value per share of unfunded commitments	2.0	2.0
Private equity secondaries
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	2.4	3.0
Net asset value per share of unfunded commitments	2.1	2.1
Direct lending / mezzanine debt
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	1.3	0.4
Net asset value per share of unfunded commitments	6.2	7.1
Real estate
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.2	0.3
Net asset value per share of unfunded commitments	0.1	0.1
Private equity funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	22.4	33.6
Net asset value per share of unfunded commitments	13.9	15.0
Private equity funds | 1 - 3 years
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	18.7
Private equity funds | 3 - 5 years
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	2.4
Private equity funds | 5 - 10 years
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Private equity funds | >10 years
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	1.3
Hedge funds and private equity funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	40.6	52.0
Net asset value per share of unfunded commitments	13.9	$ 15.0
Monthly | Hedge funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Monthly | Hedge funds | 30 - 59 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Monthly | Hedge funds | 60 - 89 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Monthly | Hedge funds | 90 - 119 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Monthly | Hedge funds | Over 120 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Quarterly | Hedge funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	16.1
Quarterly | Hedge funds | 30 - 59 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	16.1
Quarterly | Hedge funds | 60 - 89 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Quarterly | Hedge funds | 90 - 119 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Quarterly | Hedge funds | Over 120 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Annually | Hedge funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	2.1
Annually | Hedge funds | 30 - 59 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Annually | Hedge funds | 60 - 89 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	0.0
Annually | Hedge funds | 90 - 119 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	2.1
Annually | Hedge funds | Over 120 days notice
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other investments at fair value	$ 0.0

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Investment Securities (Surplus Notes) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Surplus Note Valuation [Line Items]
Statutory Excess Capital Percentage			250.00%
Surplus notes
Surplus Note Valuation [Line Items]
Proceeds from Interest Received	$ 2.4
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations		$ 101.0	$ 101.0
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		(30.5)	(29.1)
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Fair Value		70.5	71.9
Surplus notes | Pari passu
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations		43.1	43.1
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		(21.5)	(22.3)
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Fair Value		21.6	20.8
Surplus notes | Seller priority
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations		57.9	57.9
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		(9.0)	(6.8)
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Fair Value		48.9	51.1
Surplus notes | Current market rates on public debt and contract-based repayments
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		10.0	5.1
Surplus notes | Current market rates on public debt and contract-based repayments | Pari passu
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		2.1	(1.1)
Surplus notes | Current market rates on public debt and contract-based repayments | Seller priority
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		7.9	6.2
Surplus notes | Regulatory approval
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		(11.0)	(15.6)
Surplus notes | Regulatory approval | Pari passu
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		(13.7)	(15.4)
Surplus notes | Regulatory approval | Seller priority
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		2.7	(0.2)
Surplus notes | Liquidity adjustment
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		(29.5)	(18.6)
Surplus notes | Liquidity adjustment | Pari passu
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		(9.9)	(5.8)
Surplus notes | Liquidity adjustment | Seller priority
Surplus Note Valuation [Line Items]
Surplus Notes Issued As Seller Financing In Sale Of Discontinued Operations, Adjustments to Fair Value		$ (19.6)	$ (12.8)

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Investment Securities (Foreign Currency Forward Contracts) (Details) - Not Designated as Hedging Instrument - Foreign currency forward contract £ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 GBP (£)
Derivative [Line Items]
Notional amount	$ 62.6		$ 62.6		£ 50.0
Foreign currency forward fair value	2.5		2.5
Gain (loss) on foreign currency forward contract	(2.3)	$ 0.0	(2.5)	$ 0.0
Standard & Poor's, A- Rating
Derivative [Line Items]
Notional amount	62.6		62.6
Carrying value	(2.5)		(2.5)
Level 2
Derivative [Line Items]
Foreign currency forward fair value	$ 2.5		$ 2.5

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Debt (Details) - USD ($)	1 Months Ended	6 Months Ended
	Nov. 30, 2012	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Senior unsecured notes, at face value		$ 275,000,000	$ 275,000,000
Unamortized original issue discount		(200,000)	(200,000)
Unamortized issuance costs		(1,500,000)	(1,600,000)
Senior unsecured notes, carrying value		273,300,000	273,200,000
Carrying Value | Onebeacon U S Holdings Inc
Debt Instrument [Line Items]
Senior unsecured notes, carrying value		273,300,000	$ 273,200,000
Revolving Credit Facility | Onebeacon U S Holdings Inc
Debt Instrument [Line Items]
Credit facility balance		0
Total commitment		65,000,000.0
2012 OBH Senior Notes | Onebeacon U S Holdings Inc
Debt Instrument [Line Items]
Senior unsecured notes, at face value	$ 275,000,000
Issue price as a percentage of par value	99.90%
Proceeds from the issuance of senior notes	$ 272,900,000
Senior notes annual interest rate	4.60%
Effective yield to maturity	4.70%
Debt instrument, acceleration clause, repayments of long-term debt		$ 75,000,000

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Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) Rate	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment Rate	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Information
Number of underwriting segments | segment			16
Number of reportable segments | segment			2
Earned premiums	$ 277.4	$ 271.4	$ 539.2	$ 550.0
Loss and loss adjustment expense	(188.6)	(179.7)	(339.2)	(338.5)
Policy acquisition expenses	(48.4)	(48.7)	(93.7)	(99.7)
Other underwriting expenses	(59.6)	(50.9)	(111.3)	(106.2)
Total underwriting loss	(19.2)	(7.9)	(5.0)	5.6
Net investment income	14.5	12.1	26.7	26.5
Net realized and change in unrealized investment gains	12.3	24.7	27.3	41.3
Net other revenues	2.1	0.8	5.5	1.7
General and administrative expenses	(8.8)	(3.5)	(13.8)	(7.4)
Interest expense	(3.3)	(3.2)	(6.6)	(6.5)
Pre-tax income (loss) from continuing operations	(2.4)	23.0	34.1	61.2
Total investment securities	2,683.7		2,683.7			$ 2,620.4
Premiums receivable	245.4		245.4			228.3
Reinsurance recoverables	198.0		198.0			179.5
Deferred acquisition costs	106.9		106.9			96.3
Ceded unearned premiums	56.6		56.6			44.2
Other assets	405.8		405.8			421.2
Total assets	3,696.4		3,696.4			3,589.9
Unpaid loss and loss adjustment expense reserves	1,411.2	1,376.6	1,411.2	1,376.6	$ 1,368.8	1,365.6	$ 1,343.8	$ 1,389.8
Unearned premiums	595.2		595.2			575.1
Funds held under insurance contracts	210.2		210.2			153.0
Debt	273.3		273.3			273.2
Other liabilities	182.4		182.4			197.8
Other liabilities	191.7		191.7			197.8
Total liabilities	$ 2,681.6		$ 2,681.6			2,564.7
Runoff
Segment Information
Quota Share Reinsurance Agreement Percentage | Rate	100.00%		100.00%
Specialty Products
Segment Information
Number of underwriting segments | segment			10
Total investment securities	$ 0.0		$ 0.0			0.0
Premiums receivable	72.9		72.9			80.1
Reinsurance recoverables	134.3		134.3			120.9
Deferred acquisition costs	51.1		51.1			46.1
Ceded unearned premiums	46.2		46.2			33.7
Other assets	1.0		1.0			1.1
Unpaid loss and loss adjustment expense reserves	778.7		778.7			734.9
Unearned premiums	301.9		301.9			307.3
Funds held under insurance contracts	210.2		210.2			153.0
Debt	0.0		0.0			0.0
Other liabilities	0.0		$ 0.0			0.0
Specialty Industries
Segment Information
Number of underwriting segments | segment			6
Total investment securities	0.0		$ 0.0			0.0
Premiums receivable	172.5		172.5			148.2
Reinsurance recoverables	46.5		46.5			40.3
Deferred acquisition costs	55.8		55.8			50.2
Ceded unearned premiums	10.4		10.4			10.5
Other assets	0.1		0.1			0.1
Unpaid loss and loss adjustment expense reserves	615.3		615.3			612.4
Unearned premiums	293.3		293.3			267.8
Funds held under insurance contracts	0.0		0.0			0.0
Debt	0.0		0.0			0.0
Other liabilities	0.0		0.0			0.0
Investing, Financing and Corporate
Segment Information
Earned premiums	0.0	0.0	0.0	0.0
Loss and loss adjustment expense	0.0	0.0	0.0	0.0
Policy acquisition expenses	0.0	0.0	0.0	0.0
Other underwriting expenses	0.0	0.0	0.0	0.0
Total underwriting loss	0.0	0.0	0.0	0.0
Net investment income	14.5	12.1	26.7	26.5
Net realized and change in unrealized investment gains	12.3	24.7	27.3	41.3
Net other revenues	1.9	0.6	5.2	1.3
General and administrative expenses	(8.3)	(3.0)	(12.8)	(6.4)
Interest expense	(3.3)	(3.2)	(6.6)	(6.5)
Pre-tax income (loss) from continuing operations	17.1	31.2	39.8	56.2
Total investment securities	2,683.7		2,683.7			2,620.4
Premiums receivable	0.0		0.0			0.0
Reinsurance recoverables	17.2		17.2			18.3
Deferred acquisition costs	0.0		0.0			0.0
Ceded unearned premiums	0.0		0.0			0.0
Other assets	404.7		404.7			420.0
Total assets	3,105.6		3,105.6			3,058.7
Unpaid loss and loss adjustment expense reserves	17.2		17.2			18.3
Unearned premiums	0.0		0.0			0.0
Funds held under insurance contracts	0.0		0.0			0.0
Debt	273.3		273.3			273.2
Other liabilities	191.7		191.7			197.8
Total liabilities	482.2		482.2			489.3
Specialty Products | Insurance Operations
Segment Information
Earned premiums	130.4	123.1	249.6	246.3
Loss and loss adjustment expense	(98.6)	(99.4)	(181.5)	(185.8)
Policy acquisition expenses	(22.0)	(21.6)	(41.6)	(44.8)
Other underwriting expenses	(24.8)	(22.3)	(45.5)	(43.6)
Total underwriting loss	(15.0)	(20.2)	(19.0)	(27.9)
Net investment income	0.0	0.0	0.0	0.0
Net realized and change in unrealized investment gains	0.0	0.0	0.0	0.0
Net other revenues	0.0	0.0	(0.1)	(0.1)
General and administrative expenses	0.0	0.0	0.0	0.0
Interest expense	0.0	0.0	0.0	0.0
Pre-tax income (loss) from continuing operations	(15.0)	(20.2)	(19.1)	(28.0)
Total assets	305.5		305.5			281.9
Total liabilities	1,290.8		1,290.8			1,195.2
Specialty Industries | Insurance Operations
Segment Information
Earned premiums	147.0	148.3	289.6	303.7
Loss and loss adjustment expense	(90.0)	(80.3)	(157.7)	(152.7)
Policy acquisition expenses	(26.4)	(27.1)	(52.1)	(54.9)
Other underwriting expenses	(34.8)	(28.6)	(65.8)	(62.6)
Total underwriting loss	(4.2)	12.3	14.0	33.5
Net investment income	0.0	0.0	0.0	0.0
Net realized and change in unrealized investment gains	0.0	0.0	0.0	0.0
Net other revenues	0.2	0.2	0.4	0.5
General and administrative expenses	(0.5)	(0.5)	(1.0)	(1.0)
Interest expense	0.0	0.0	0.0	0.0
Pre-tax income (loss) from continuing operations	(4.5)	$ 12.0	13.4	$ 33.0
Total assets	285.3		285.3			249.3
Total liabilities	$ 908.6		$ 908.6			$ 880.2

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Retirement Plans (Other Benefit Plans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Settlement loss	$ 0.0	$ (0.1)	$ 0.0		$ 0.2
Defined benefit plan, fair value of plan assets	14.3		14.3
Defined benefit plan, expected contributions in current fiscal year			2.1
Defined benefit plan, contributions by employer	0.5		$ 1.0
Defined contribution plan, employer matching contribution, percent of match			50.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay			6.00%		3.00%
Defined contribution plan, cost recognized	0.8	$ 0.7	$ 1.8		$ 1.4
Postretirement Life Insurance
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Assets transferred out of trust				$ 5.5		$ 47.1
Defined benefit plan, fair value of plan assets	43.0		43.0
Post-employment benefit liability	12.8		12.8	12.8		12.8
Assets held in trust	22.7		22.7	29.3		29.3
Supplemental Employee Retirement Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Post-employment benefit liability	$ 2.7		$ 2.7	$ 3.1		$ 3.1

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Retirement Plans (Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 0.0	$ 0.0	$ 0.0	$ 0.2
Interest cost	0.2	0.3	0.4	1.1
Expected return on plan assets	0.0	0.0	0.0	(1.0)
Amortization of unrecognized loss	0.2	0.2	0.4	0.5
Net periodic pension cost	0.4	0.5	0.8	0.8
Settlement loss	0.0	(0.1)	0.0	0.2
Total net periodic benefit cost	$ 0.4	$ 0.4	$ 0.8	$ 1.0

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Employee Share-Based Incentive Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expense recognized	$ 6.5	$ 2.5	$ 9.5	$ 5.2

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Employee Share-Based Incentive Compensation Plans (Performance Shares) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Expense amortized
Expense recognized	$ 6.5	$ 2.5	$ 9.5	$ 5.2
Performance shares
Additional disclosures
Growth target percentage	100.00%
Long Term Incentive Plan | Performance shares
Activity in plan
Beginning of period (in shares)	309,796	441,206	452,519	449,435
Payments and deferrals (in shares)	0	0	(142,710)	(167,300)
New awards (in shares)	0	0	0	163,150
Forfeitures and net change in assumed forfeitures (in shares)	0	0	(13)	(4,079)
End of period (in shares)	309,796	441,206	309,796	441,206
Expense amortized
Accrued expense at beginning of period	$ 1.9	$ 1.1	$ 1.6	$ 1.4
Payments and deferrals	0.0	0.0	0.0	(0.7)
Forfeitures and net change in assumed forfeitures	0.0	0.0	0.0	0.0
Expense recognized	2.0	(0.1)	2.3	0.3
Accrued expense at end of period	$ 3.9	$ 1.0	$ 3.9	$ 1.0
Additional disclosures
Target OB Performance Shares outstanding	309,796		309,796
Assumed forfeitures (in shares)	0		0
Assumed forfeitures	$ 0.0		$ 0.0
Percentage of shares required to vest					100.00%
Additional compensation cost that would be recognized if all outstanding performance shares vested					$ 1.9
Long Term Incentive Plan | Performance shares | Performance cycle 2013 - 2015
Additional disclosures
Growth target percentage				24.30%
Long Term Incentive Plan | Performance shares | Performance cycle 2014 - 2016
Additional disclosures
Growth target percentage			0.00%
Long Term Incentive Plan | Performance shares | Performance cycle 2015 - 2017
Expense amortized
Accrued expense at end of period	$ 2.5		$ 2.5
Additional disclosures
Target OB Performance Shares outstanding	146,646		146,646
Long Term Incentive Plan | Performance shares | Performance cycle 2016 - 2018
Expense amortized
Accrued expense at end of period	$ 1.4		$ 1.4
Additional disclosures
Target OB Performance Shares outstanding	163,150		163,150
Long Term Incentive Plan | Performance shares | Subtotal
Expense amortized
Accrued expense at end of period	$ 3.9		$ 3.9
Additional disclosures
Target OB Performance Shares outstanding	309,796		309,796

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Employee Share-Based Incentive Compensation Plans (Summary of Restricted Shares) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Unamortized grant date fair value
Expense recognized	$ (6.5)	$ (2.5)	$ (9.5)	$ (5.2)
Restricted Stock
Activity in plan
Beginning of period (in shares)	699,532	395,872	395,872	382,722
New awards (in shares)	0	0	461,160	170,650
Forfeitures (in shares)	0	0	0	0
Vested (in shares)	0	0	(157,500)	(157,500)
End of period (in shares)	699,532	395,872	699,532	395,872
Unamortized grant date fair value
Unamortized grant date fair value, beginning of period	$ 7.1	$ 3.5	$ 7.1	$ 3.5
Issued	0.0	0.0	7.4	2.3
Forfeitures and net change in assumed forfeitures	0.0
Expense recognized	(1.5)	(0.8)	(2.4)	(1.3)
Unamortized grant date fair value, beginning of period	$ 8.6	$ 4.3	$ 2.1	$ 2.5

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Employee Share-Based Incentive Compensation Plans (Restricted Shares and Stock Units) (Details) - USD ($) $ in Millions									3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 22, 2017	Feb. 24, 2016	Feb. 22, 2016	Feb. 24, 2015	Feb. 22, 2015	Feb. 22, 2014	May 25, 2011	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Apr. 24, 2015
Employee Share-Based Incentive Compensation Plans
Expense recognized									$ 6.5	$ 2.5	$ 9.5	$ 5.2
Restricted Stock
Employee Share-Based Incentive Compensation Plans
New awards (in shares)									0	0	461,160	170,650
Issued									$ 0.0	$ 0.0	$ 7.4	$ 2.3
Nonvested (in shares)									699,532	395,872	699,532	395,872	699,532	395,872	395,872	382,722
Vested (in shares)									0	0	157,500	157,500
Grant date fair value											$ 2.1	$ 2.1
Unrecognized compensation expense									$ 7.1	$ 3.5	$ 7.1	3.5	$ 8.6	$ 2.1	$ 4.3	$ 2.5
Weighted-average period											10 months
Expense recognized									1.5	0.8	$ 2.4	1.3
Restricted Stock Units (RSUs)
Employee Share-Based Incentive Compensation Plans
Expense recognized									1.5	$ 0.5	2.1	$ 0.9
Additional compensation cost that would be recognized if all outstanding RSUs vested									$ 7.0		$ 7.0
Awards Issued In 2017 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
New awards (in shares)	461,160
Issued	$ 7.4
Awards Issued In 2017 | Restricted Stock Units (RSUs)
Employee Share-Based Incentive Compensation Plans
New awards (in shares)											240,840
Nonvested (in shares)									239,470		239,470
Awards Issued in 2016 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
New awards (in shares)			170,650
Issued			$ 2.3
Awards Issued in 2016 | Restricted Stock Units (RSUs)
Employee Share-Based Incentive Compensation Plans
New awards (in shares)												227,788
Nonvested (in shares)									206,502		206,502
Awards Issued in 2015 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
New awards (in shares)					75,950
Issued					$ 1.1
Shares scheduled to cliff vest																	67,722
Tranche One | Awards Issued In 2017 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
Nonvested (in shares)	235,000
Tranche One | Awards Issued in 2016 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
Nonvested (in shares)			92,500
Tranche Two | Awards Issued In 2017 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
Nonvested (in shares)	115,450
Tranche Two | Awards Issued in 2016 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
Nonvested (in shares)			78,150
Tranche Three | Awards Issued In 2017 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
Nonvested (in shares)	110,710
Chief Executive Officer | Awards Issued in 2011 | Restricted Stock
Employee Share-Based Incentive Compensation Plans
New awards (in shares)								630,000
Vested (in shares)		157,500		157,500		157,500	157,500

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Employee Share-Based Incentive Compensation Plans (Other Share-Based Compensation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Employee Share-Based Incentive Compensation Plans
Expense recognized	$ 6.5	$ 2.5	$ 9.5	$ 5.2
Percentage Owned of Common Stock	3.00%		3.00%		3.00%
KSOP
Employee Share-Based Incentive Compensation Plans
Expense recognized	$ 1.5	$ 1.3	$ 2.7	$ 2.7

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Contingency [Line Items]
Effective tax rate	112.50%	(8.70%)		3.50%	(17.50%)
Federal statutory rate	35.00%		35.00%	35.00%	35.00%
Foreign Tax Authority
Income Tax Contingency [Line Items]
Effective tax rate on non-U.S. income	0.70%	0.50%		0.30%	0.70%
2007 to 2009 | Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Favorable settlement					$ 12.8
2010 to 2012 | Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Favorable settlement		$ 3.5			$ 3.5

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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value of Financial Instruments
Debt	$ 273.3	$ 273.2
Fair Value | Onebeacon U S Holdings Inc
Fair Value of Financial Instruments
Long-term Debt, Fair Value	282.4	274.2
Carrying Value | Onebeacon U S Holdings Inc
Fair Value of Financial Instruments
Debt	$ 273.3	$ 273.2

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Legal Contingencies (Details) - Pending Litigation - Tribune Company Litigation	6 Months Ended
	Jun. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Proceeds common stock, litigation settlement	$ 32,000,000
Estimated litigation liability	$ 0

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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings attributable to OneBeacon's common shareholders—basic and diluted (in millions):
Net income (loss) attributable to OneBeacon's common shareholders	$ (0.1)	$ 24.5	$ 32.0	$ 70.9
Allocation of income for participating unvested restricted common shares	0.0	(0.1)	(0.2)	(0.3)
Dividends paid on participating restricted common shares	(0.2)	(0.1)	(0.3)	(0.1)
Total allocation to restricted common shares	(0.2)	(0.2)	(0.5)	(0.4)
Net income (loss) attributable to OneBeacon's common shareholders, net of restricted common share amounts	(0.3)	24.3	31.5	70.5
Undistributed Earnings, Basic [Abstract]
Net income (loss) attributable to OneBeacon's common shareholders, net of restricted common share amounts	(0.3)	24.3	31.5	70.5
Dividends paid, net of restricted common share amounts	(19.7)	(19.7)	(39.5)	(39.5)
Total undistributed (overdistributed) net earnings, net of restricted common share amounts	$ (20.0)	$ 4.6	$ (8.0)	$ 31.0
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Total weighted average common shares outstanding	94.7	94.3	94.6	94.4
Weighted average unvested restricted common shares	(0.7)	(0.4)	(0.6)	(0.4)
Basic and diluted earnings per share denominator	94.0	93.9	94.0	94.0
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income from continuing operations attributable to OneBeacon's common shareholders	$ 0.00	$ 0.26	$ 0.34	$ 0.75
Dividends declared and paid	(0.21)	(0.21)	(0.42)	(0.42)
Undistributed (overdistributed) earnings	(0.21)	0.05	$ (0.08)	$ 0.33
Total OneBeacon common shareholders' equity
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Dividends declared and paid	$ (0.21000000)	$ (0.21000000)

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Common Shareholders' Equity and Noncontrolling Interest (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Aug. 22, 2007
Equity, Class of Treasury Stock [Line Items]
Dividends, per share, cash paid (in USD per share)			$ 0.21	$ 0.21	$ 0.42	$ 0.42
Dividends					$ 40,800,000	$ 40,600,000
Net change in benefit plan assets and obligations					400,000	300,000
Income tax expense					(100,000)	(100,000)
Net change in benefit plan assets and obligations, net of tax			$ (200,000)	$ (200,000)	(300,000)	(200,000)
Payments for repurchase of stock	$ 4,100,000				$ 1,100,000	$ 11,500,000
Percentage of ownership after transaction	89.00%
Percentage of ownership before transaction		81.00%
Class A common
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount (up to)							$ 200,000,000.0
Stock repurchased (in shares)					0	850,349
Stock repurchased						$ 10,600,000
Average price per share (in USD per share)						$ 12.42
Amount of authorization remaining	$ 75,000,000		$ 75,000,000		$ 75,000,000
Total OneBeacon common shareholders' equity
Equity, Class of Treasury Stock [Line Items]
Dividends, per share, cash paid (in USD per share)			$ 0.21000000	$ 0.21000000
Dividends					39,800,000	$ 39,600,000
Net change in benefit plan assets and obligations, net of tax					(300,000)	(200,000)
AOCL
Equity, Class of Treasury Stock [Line Items]
Dividends					0	0
Net change in benefit plan assets and obligations, net of tax					(300,000)	(200,000)
Share repurchase for employee tax withholding | Class A common
Equity, Class of Treasury Stock [Line Items]
Stock repurchased					$ 1,100,000	$ 900,000
Repurchased (in shares)					67,273	64,981

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Consolidating Financial Information (Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Fixed maturity investments, at fair value (amortized cost: $2,269.8 in 2017 and $2,164.4 in 2016)	$ 2,288.6		$ 2,169.1
Short-term investments, at amortized cost (which approximates fair value)	55.5		112.1
Common equity securities, at fair value (cost: $183.8 in 2017 and $182.3 in 2016)	205.5		188.7
Other investments, at fair value	134.1		150.5
Total investment securities	2,683.7		2,620.4
Cash	71.3		69.6	$ 72.9		$ 95.2
Reinsurance recoverables	198.0		179.5
Premiums receivable	245.4		228.3
Deferred acquisition costs	106.9		96.3
Ceded unearned premiums	56.6		44.2
Net deferred tax asset	130.1		126.7
Investment income accrued	12.9		11.3
Accounts receivable on unsettled investment sales	5.8		1.4
Investments in subsidiaries	0.0		0.0
Other assets	185.7		212.2
Total assets	3,696.4		3,589.9
Liabilities
Unpaid loss and loss adjustment expense reserves	1,411.2	$ 1,368.8	1,365.6	1,376.6	$ 1,343.8	1,389.8
Unearned premiums	595.2		575.1
Funds held under insurance contracts	210.2		153.0
Debt	273.3		273.2
Accounts payable on unsettled investment purchases	9.3		0.0
Other liabilities	182.4		197.8
Total liabilities	2,681.6		2,564.7
Equity [Abstract]
Total OneBeacon's common shareholders' equity	1,015.1		1,021.3
Total noncontrolling interests	(0.3)		3.9
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,014.8		1,025.2	1,025.9		1,004.5
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	3,696.4		3,589.9
Consolidating adjustments
Investments, Debt and Equity Securities [Abstract]
Fixed maturity investments, at fair value (amortized cost: $2,269.8 in 2017 and $2,164.4 in 2016)	0.0		0.0
Short-term investments, at amortized cost (which approximates fair value)	0.0		0.0
Common equity securities, at fair value (cost: $183.8 in 2017 and $182.3 in 2016)	0.0		0.0
Other investments, at fair value	0.0		0.0
Total investment securities	0.0		0.0
Cash	0.0		0.0	0.0		0.0
Reinsurance recoverables	0.0		0.0
Premiums receivable	0.0		0.0
Deferred acquisition costs	0.0		0.0
Ceded unearned premiums	0.0		0.0
Net deferred tax asset	0.1		0.1
Investment income accrued	0.0		0.0
Accounts receivable on unsettled investment sales	0.0		0.0
Investments in subsidiaries	(1,982.5)		(2,008.2)
Other assets	0.0		0.0
Total assets	(1,982.4)		(2,008.1)
Liabilities
Unpaid loss and loss adjustment expense reserves	0.0		0.0
Unearned premiums	0.0		0.0
Funds held under insurance contracts	0.0		0.0
Debt	0.0		0.0
Accounts payable on unsettled investment purchases	0.0
Other liabilities	0.0		0.0
Total liabilities	0.0		0.0
Equity [Abstract]
Total OneBeacon's common shareholders' equity	(1,982.4)		(2,008.1)
Total noncontrolling interests	0.0		0.0
Total OneBeacon's common shareholders' equity and noncontrolling interests	(1,982.4)		(2,008.1)
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	(1,982.4)		(2,008.1)
Reportable Legal Entities | The Company (guarantor)
Investments, Debt and Equity Securities [Abstract]
Fixed maturity investments, at fair value (amortized cost: $2,269.8 in 2017 and $2,164.4 in 2016)	0.0		0.0
Short-term investments, at amortized cost (which approximates fair value)	5.4		2.5
Common equity securities, at fair value (cost: $183.8 in 2017 and $182.3 in 2016)	0.0		0.0
Other investments, at fair value	0.0		0.0
Total investment securities	5.4		2.5
Cash	0.0		0.0	0.0		0.0
Reinsurance recoverables	0.0		0.0
Premiums receivable	0.0		0.0
Deferred acquisition costs	0.0		0.0
Ceded unearned premiums	0.0		0.0
Net deferred tax asset	0.0		0.0
Investment income accrued	0.0		0.0
Accounts receivable on unsettled investment sales	0.0		0.0
Investments in subsidiaries	1,015.6		1,018.8
Other assets	0.6		0.4
Total assets	1,021.6		1,021.7
Liabilities
Unpaid loss and loss adjustment expense reserves	0.0		0.0
Unearned premiums	0.0		0.0
Funds held under insurance contracts	0.0		0.0
Debt	0.0		0.0
Accounts payable on unsettled investment purchases	0.0
Other liabilities	6.5		0.4
Total liabilities	6.5		0.4
Equity [Abstract]
Total OneBeacon's common shareholders' equity	1,015.1		1,021.3
Total noncontrolling interests	0.0		0.0
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,015.1		1,021.3
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	1,021.6		1,021.7
Reportable Legal Entities | Non-guarantor subsidiaries
Investments, Debt and Equity Securities [Abstract]
Fixed maturity investments, at fair value (amortized cost: $2,269.8 in 2017 and $2,164.4 in 2016)	2,288.6		2,169.1
Short-term investments, at amortized cost (which approximates fair value)	44.2		108.1
Common equity securities, at fair value (cost: $183.8 in 2017 and $182.3 in 2016)	205.5		188.7
Other investments, at fair value	134.1		150.5
Total investment securities	2,672.4		2,616.4
Cash	71.2		69.5	71.3		94.6
Reinsurance recoverables	198.0		179.5
Premiums receivable	245.4		228.3
Deferred acquisition costs	106.9		96.3
Ceded unearned premiums	56.6		44.2
Net deferred tax asset	130.0		126.6
Investment income accrued	12.9		11.3
Accounts receivable on unsettled investment sales	5.8		1.4
Investments in subsidiaries	0.0		0.0
Other assets	184.0		211.4
Total assets	3,683.2		3,584.9
Liabilities
Unpaid loss and loss adjustment expense reserves	1,411.2		1,365.6
Unearned premiums	595.2		575.1
Funds held under insurance contracts	210.2		153.0
Debt	0.0		0.0
Accounts payable on unsettled investment purchases	9.3
Other liabilities	171.0		190.6
Total liabilities	2,396.9		2,284.3
Equity [Abstract]
Total OneBeacon's common shareholders' equity	1,286.6		1,296.7
Total noncontrolling interests	(0.3)		3.9
Total OneBeacon's common shareholders' equity and noncontrolling interests	1,286.3		1,300.6
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	3,683.2		3,584.9
Reportable Legal Entities | OBH (issuer)
Investments, Debt and Equity Securities [Abstract]
Fixed maturity investments, at fair value (amortized cost: $2,269.8 in 2017 and $2,164.4 in 2016)	0.0		0.0
Short-term investments, at amortized cost (which approximates fair value)	5.9		1.5
Common equity securities, at fair value (cost: $183.8 in 2017 and $182.3 in 2016)	0.0		0.0
Other investments, at fair value	0.0		0.0
Total investment securities	5.9		1.5
Cash	0.1		0.1	$ 1.6		$ 0.6
Reinsurance recoverables	0.0		0.0
Premiums receivable	0.0		0.0
Deferred acquisition costs	0.0		0.0
Ceded unearned premiums	0.0		0.0
Net deferred tax asset	0.0		0.0
Investment income accrued	0.0		0.0
Accounts receivable on unsettled investment sales	0.0		0.0
Investments in subsidiaries	966.9		989.4
Other assets	1.1		0.4
Total assets	974.0		991.4
Liabilities
Unpaid loss and loss adjustment expense reserves	0.0		0.0
Unearned premiums	0.0		0.0
Funds held under insurance contracts	0.0		0.0
Debt	273.3		273.2
Accounts payable on unsettled investment purchases	0.0
Other liabilities	4.9		6.8
Total liabilities	278.2		280.0
Equity [Abstract]
Total OneBeacon's common shareholders' equity	695.8		711.4
Total noncontrolling interests	0.0		0.0
Total OneBeacon's common shareholders' equity and noncontrolling interests	695.8		711.4
Total liabilities, OneBeacon's common shareholders' equity and noncontrolling interests	$ 974.0		$ 991.4

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Consolidating Financial Information (Consolidating Statement of Operations and Comprehensive (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Earned premiums	$ 277.4	$ 271.4	$ 539.2	$ 550.0
Net investment income	14.5	12.1	26.7	26.5
Net realized and change in unrealized investment gains	12.3	24.7	27.3	41.3
Net other revenues	2.1	0.8	5.5	1.7
Total revenues	306.3	309.0	598.7	619.5
Expenses
Loss and loss adjustment expenses	188.6	179.7	339.2	338.5
Policy acquisition expenses	48.4	48.7	93.7	99.7
Other underwriting expenses	59.6	50.9	111.3	106.2
General and administrative expenses	8.8	3.5	13.8	7.4
Interest expense	3.3	3.2	6.6	6.5
Total expenses	308.7	286.0	564.6	558.3
Pre-tax income (loss)	(2.4)	23.0	34.1	61.2
Income tax (expense) benefit	2.7	2.0	(1.2)	10.7
Income (loss) before equity in earnings of unconsolidated affiliates	0.3	25.0	32.9	71.9
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Net income including noncontrolling interests	0.3	25.0	32.9	71.9
Less: Net income attributable to noncontrolling interests	(0.4)	(0.5)	(0.9)	(1.0)
Net income (loss) attributable to OneBeacon's common shareholders	(0.1)	24.5	32.0	70.9
Other comprehensive income, net of tax	0.2	0.2	0.3	0.2
Comprehensive income attributable to OneBeacon's common shareholders	0.1	24.7	32.3	71.1
Consolidating adjustments
Revenues
Earned premiums	0.0	0.0	0.0	0.0
Net investment income	0.0	0.0	0.0	0.0
Net realized and change in unrealized investment gains	0.0	0.0	0.0	0.0
Net other revenues	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Expenses
Loss and loss adjustment expenses	0.0	0.0	0.0	0.0
Policy acquisition expenses	0.0	0.0	0.0	0.0
Other underwriting expenses	0.0	0.0	0.0	0.0
General and administrative expenses	0.0	0.0	0.0	0.0
Interest expense	0.0	0.0	0.0	0.0
Total expenses	0.0	0.0	0.0	0.0
Pre-tax income (loss)	0.0	0.0	0.0	0.0
Income tax (expense) benefit	0.0	0.0	0.0	0.0
Income (loss) before equity in earnings of unconsolidated affiliates	0.0	0.0	0.0	0.0
Equity in earnings of subsidiaries, net of tax	(6.9)	(43.7)	(53.1)	(114.0)
Net income including noncontrolling interests	(6.9)	(43.7)	(53.1)	(114.0)
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to OneBeacon's common shareholders	(6.9)	(43.7)	(53.1)	(114.0)
Other comprehensive income, net of tax	(0.2)	(0.2)	(0.3)	(0.2)
Comprehensive income attributable to OneBeacon's common shareholders	(7.1)	(43.9)	(53.4)	(114.2)
Reportable Legal Entities | The Company (guarantor)
Revenues
Earned premiums	0.0	0.0	0.0	0.0
Net investment income	0.0	0.0	0.0	0.0
Net realized and change in unrealized investment gains	0.0	0.0	0.0	0.0
Net other revenues	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Expenses
Loss and loss adjustment expenses	0.0	0.0	0.0	0.0
Policy acquisition expenses	0.0	0.0	0.0	0.0
Other underwriting expenses	0.0	0.0	0.0	0.0
General and administrative expenses	6.5	1.2	9.4	2.4
Interest expense	0.0	0.0	0.0	0.0
Total expenses	6.5	1.2	9.4	2.4
Pre-tax income (loss)	(6.5)	(1.2)	(9.4)	(2.4)
Income tax (expense) benefit	0.0	0.0	0.0	0.0
Income (loss) before equity in earnings of unconsolidated affiliates	(6.5)	(1.2)	(9.4)	(2.4)
Equity in earnings of subsidiaries, net of tax	6.4	25.7	41.4	73.3
Net income including noncontrolling interests	(0.1)	24.5	32.0	70.9
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to OneBeacon's common shareholders	(0.1)	24.5	32.0	70.9
Other comprehensive income, net of tax	0.2	0.2	0.3	0.2
Comprehensive income attributable to OneBeacon's common shareholders	0.1	24.7	32.3	71.1
Reportable Legal Entities | Non-guarantor subsidiaries
Revenues
Earned premiums	277.4	271.4	539.2	550.0
Net investment income	14.5	12.1	26.7	26.5
Net realized and change in unrealized investment gains	12.3	24.7	27.3	41.3
Net other revenues	2.1	0.8	5.5	1.7
Total revenues	306.3	309.0	598.7	619.5
Expenses
Loss and loss adjustment expenses	188.6	179.7	339.2	338.5
Policy acquisition expenses	48.4	48.7	93.7	99.7
Other underwriting expenses	59.6	50.9	111.3	106.2
General and administrative expenses	2.2	2.1	4.2	4.8
Interest expense	0.0	0.0	0.0	0.0
Total expenses	298.8	281.4	548.4	549.2
Pre-tax income (loss)	7.5	27.6	50.3	70.3
Income tax (expense) benefit	1.5	0.0	(3.8)	7.1
Income (loss) before equity in earnings of unconsolidated affiliates	9.0	27.6	46.5	77.4
Equity in earnings of subsidiaries, net of tax	0.0	0.0	0.0	0.0
Net income including noncontrolling interests	9.0	27.6	46.5	77.4
Less: Net income attributable to noncontrolling interests	(0.4)	(0.5)	(0.9)	(1.0)
Net income (loss) attributable to OneBeacon's common shareholders	8.6	27.1	45.6	76.4
Other comprehensive income, net of tax	0.0	0.0	0.0	0.0
Comprehensive income attributable to OneBeacon's common shareholders	8.6	27.1	45.6	76.4
Reportable Legal Entities | OBH (issuer)
Revenues
Earned premiums	0.0	0.0	0.0	0.0
Net investment income	0.0	0.0	0.0	0.0
Net realized and change in unrealized investment gains	0.0	0.0	0.0	0.0
Net other revenues	0.0	0.0	0.0	0.0
Total revenues	0.0	0.0	0.0	0.0
Expenses
Loss and loss adjustment expenses	0.0	0.0	0.0	0.0
Policy acquisition expenses	0.0	0.0	0.0	0.0
Other underwriting expenses	0.0	0.0	0.0	0.0
General and administrative expenses	0.1	0.2	0.2	0.2
Interest expense	3.3	3.2	6.6	6.5
Total expenses	3.4	3.4	6.8	6.7
Pre-tax income (loss)	(3.4)	(3.4)	(6.8)	(6.7)
Income tax (expense) benefit	1.2	2.0	2.6	3.6
Income (loss) before equity in earnings of unconsolidated affiliates	(2.2)	(1.4)	(4.2)	(3.1)
Equity in earnings of subsidiaries, net of tax	0.5	18.0	11.7	40.7
Net income including noncontrolling interests	(1.7)	16.6	7.5	37.6
Less: Net income attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to OneBeacon's common shareholders	(1.7)	16.6	7.5	37.6
Other comprehensive income, net of tax	0.2	0.2	0.3	0.2
Comprehensive income attributable to OneBeacon's common shareholders	$ (1.5)	$ 16.8	$ 7.8	$ 37.8

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Consolidating Financial Information (Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Net income including noncontrolling interests		$ 0.3	$ 25.0	$ 32.9	$ 71.9
Charges (credits) to reconcile net income to cash flows provided from operations:
Undistributed earnings from subsidiaries		0.0	0.0	0.0	0.0
Net realized and change in unrealized investment gains		(12.3)	(24.7)	(27.3)	(41.3)
Deferred income tax (benefit) expense				(2.6)	19.2
Dividends received from subsidiaries				0.0	0.0
Other operating items:
Net change in loss and LAE reserves				45.6	(13.2)
Net change in unearned premiums				20.1	(3.9)
Net change in ceded unearned premium				(12.4)	(5.0)
Net change in premiums receivable				(17.1)	(19.9)
Net change in reinsurance recoverable on paid and unpaid losses				(18.5)	10.0
Net change in funds held under insurance contracts				57.2	3.2
Net change in other assets and liabilities				8.3	(38.3)
Net cash provided from (used for) operations				86.2	(17.3)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments				56.6	(45.4)
Maturities of fixed maturity investments				158.6	229.5
Sales of fixed maturity investments				686.1	200.5
Sales of common equity securities				5.8	174.4
Return of capital and distributions of other investments				13.5	7.0
Purchases of fixed maturity investments				(957.9)	(449.4)
Purchases of common equity securities				(6.2)	(109.5)
Contributions for other investments				(0.9)	(0.4)
Net change in unsettled investment purchases and sales				4.8	42.5
Net acquisitions of property and equipment				(4.0)	(2.1)
Capital contribution from parent				0.0	0.0
Net cash (used for) provided from investing activities				(43.6)	47.1
Cash flows from financing activities:
Cash dividends paid to common shareholders				(39.8)	(39.6)
Cash dividends paid to parent				0.0	0.0
Capital contribution to subsidiary				0.0	0.0
Return of capital to OneBeacon U.S. Enterprises Holdings, Inc.	$ (4.1)			(1.1)	(11.5)
Payments on capital lease obligation				0.0	(1.0)
Net cash used for financing activities				(40.9)	(52.1)
Net increase (decrease) in cash during period				1.7	(22.3)
Cash balance at beginning of period				69.6	95.2
Cash balance at end of period	71.3	71.3	72.9	71.3	72.9
Consolidating adjustments
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Net income including noncontrolling interests		(6.9)	(43.7)	(53.1)	(114.0)
Charges (credits) to reconcile net income to cash flows provided from operations:
Undistributed earnings from subsidiaries		6.9	43.7	53.1	114.0
Net realized and change in unrealized investment gains		0.0	0.0	0.0	0.0
Deferred income tax (benefit) expense				0.0	0.0
Dividends received from subsidiaries				(45.0)	(51.0)
Other operating items:
Net change in loss and LAE reserves				0.0	0.0
Net change in unearned premiums				0.0	0.0
Net change in ceded unearned premium				0.0	0.0
Net change in premiums receivable				0.0	0.0
Net change in reinsurance recoverable on paid and unpaid losses				0.0	0.0
Net change in funds held under insurance contracts				0.0	0.0
Net change in other assets and liabilities				0.0	0.0
Net cash provided from (used for) operations				(45.0)	(51.0)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments				0.0	0.0
Maturities of fixed maturity investments				0.0	0.0
Sales of fixed maturity investments				0.0	(42.5)
Sales of common equity securities				0.0	0.0
Return of capital and distributions of other investments				0.0	0.0
Purchases of fixed maturity investments				0.0	42.5
Purchases of common equity securities				0.0	0.0
Contributions for other investments				0.0	0.0
Net change in unsettled investment purchases and sales				0.0	0.0
Net acquisitions of property and equipment				0.0	0.0
Capital contribution from parent				(58.0)	(55.8)
Net cash (used for) provided from investing activities				(58.0)	(55.8)
Cash flows from financing activities:
Cash dividends paid to common shareholders				0.0	0.0
Cash dividends paid to parent				45.0	51.0
Capital contribution to subsidiary				58.0	55.8
Return of capital to OneBeacon U.S. Enterprises Holdings, Inc.				0.0	0.0
Payments on capital lease obligation				0.0	0.0
Net cash used for financing activities				103.0	106.8
Net increase (decrease) in cash during period				0.0	0.0
Cash balance at beginning of period				0.0	0.0
Cash balance at end of period	0.0	0.0	0.0	0.0	0.0
Reportable Legal Entities | The Company (guarantor)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Net income including noncontrolling interests		(0.1)	24.5	32.0	70.9
Charges (credits) to reconcile net income to cash flows provided from operations:
Undistributed earnings from subsidiaries		(6.4)	(25.7)	(41.4)	(73.3)
Net realized and change in unrealized investment gains		0.0	0.0	0.0	0.0
Deferred income tax (benefit) expense				0.0	0.0
Dividends received from subsidiaries				45.0	51.0
Other operating items:
Net change in loss and LAE reserves				0.0	0.0
Net change in unearned premiums				0.0	0.0
Net change in ceded unearned premium				0.0	0.0
Net change in premiums receivable				0.0	0.0
Net change in reinsurance recoverable on paid and unpaid losses				0.0	0.0
Net change in funds held under insurance contracts				0.0	0.0
Net change in other assets and liabilities				8.2	1.2
Net cash provided from (used for) operations				43.8	49.8
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments				(2.9)	1.3
Maturities of fixed maturity investments				0.0	0.0
Sales of fixed maturity investments				0.0	0.0
Sales of common equity securities				0.0	0.0
Return of capital and distributions of other investments				0.0	0.0
Purchases of fixed maturity investments				0.0	0.0
Purchases of common equity securities				0.0	0.0
Contributions for other investments				0.0	0.0
Net change in unsettled investment purchases and sales				0.0	0.0
Net acquisitions of property and equipment				0.0	0.0
Capital contribution from parent				0.0	0.0
Net cash (used for) provided from investing activities				(2.9)	1.3
Cash flows from financing activities:
Cash dividends paid to common shareholders				(39.8)	(39.6)
Cash dividends paid to parent				0.0	0.0
Capital contribution to subsidiary				0.0	0.0
Return of capital to OneBeacon U.S. Enterprises Holdings, Inc.				(1.1)	(11.5)
Payments on capital lease obligation				0.0	0.0
Net cash used for financing activities				(40.9)	(51.1)
Net increase (decrease) in cash during period				0.0	0.0
Cash balance at beginning of period				0.0	0.0
Cash balance at end of period	0.0	0.0	0.0	0.0	0.0
Reportable Legal Entities | Non-guarantor subsidiaries
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Net income including noncontrolling interests		9.0	27.6	46.5	77.4
Charges (credits) to reconcile net income to cash flows provided from operations:
Undistributed earnings from subsidiaries		0.0	0.0	0.0	0.0
Net realized and change in unrealized investment gains		(12.3)	(24.7)	(27.3)	(41.3)
Deferred income tax (benefit) expense				(2.6)	19.2
Dividends received from subsidiaries				0.0	0.0
Other operating items:
Net change in loss and LAE reserves				45.6	(13.2)
Net change in unearned premiums				20.1	(3.9)
Net change in ceded unearned premium				(12.4)	(5.0)
Net change in premiums receivable				(17.1)	(19.9)
Net change in reinsurance recoverable on paid and unpaid losses				(18.5)	10.0
Net change in funds held under insurance contracts				57.2	3.2
Net change in other assets and liabilities				2.5	(35.4)
Net cash provided from (used for) operations				94.0	(8.9)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments				63.9	(47.8)
Maturities of fixed maturity investments				158.6	229.5
Sales of fixed maturity investments				686.1	218.8
Sales of common equity securities				5.8	174.4
Return of capital and distributions of other investments				13.5	7.0
Purchases of fixed maturity investments				(957.9)	(473.6)
Purchases of common equity securities				(6.2)	(109.5)
Contributions for other investments				(0.9)	(0.4)
Net change in unsettled investment purchases and sales				4.8	42.5
Net acquisitions of property and equipment				(4.0)	(2.1)
Capital contribution from parent				23.5	27.3
Net cash (used for) provided from investing activities				(12.8)	66.1
Cash flows from financing activities:
Cash dividends paid to common shareholders				0.0	0.0
Cash dividends paid to parent				(45.0)	(51.0)
Capital contribution to subsidiary				(34.5)	(28.5)
Return of capital to OneBeacon U.S. Enterprises Holdings, Inc.				0.0	0.0
Payments on capital lease obligation				0.0	(1.0)
Net cash used for financing activities				(79.5)	(80.5)
Net increase (decrease) in cash during period				1.7	(23.3)
Cash balance at beginning of period				69.5	94.6
Cash balance at end of period	71.2	71.2	71.3	71.2	71.3
Reportable Legal Entities | OBH (issuer)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Net income including noncontrolling interests		(1.7)	16.6	7.5	37.6
Charges (credits) to reconcile net income to cash flows provided from operations:
Undistributed earnings from subsidiaries		(0.5)	(18.0)	(11.7)	(40.7)
Net realized and change in unrealized investment gains		0.0	0.0	0.0	0.0
Deferred income tax (benefit) expense				0.0	0.0
Dividends received from subsidiaries				0.0	0.0
Other operating items:
Net change in loss and LAE reserves				0.0	0.0
Net change in unearned premiums				0.0	0.0
Net change in ceded unearned premium				0.0	0.0
Net change in premiums receivable				0.0	0.0
Net change in reinsurance recoverable on paid and unpaid losses				0.0	0.0
Net change in funds held under insurance contracts				0.0	0.0
Net change in other assets and liabilities				(2.4)	(4.1)
Net cash provided from (used for) operations				(6.6)	(7.2)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments				(4.4)	1.1
Maturities of fixed maturity investments				0.0	0.0
Sales of fixed maturity investments				0.0	24.2
Sales of common equity securities				0.0	0.0
Return of capital and distributions of other investments				0.0	0.0
Purchases of fixed maturity investments				0.0	(18.3)
Purchases of common equity securities				0.0	0.0
Contributions for other investments				0.0	0.0
Net change in unsettled investment purchases and sales				0.0	0.0
Net acquisitions of property and equipment				0.0	0.0
Capital contribution from parent				34.5	28.5
Net cash (used for) provided from investing activities				30.1	35.5
Cash flows from financing activities:
Cash dividends paid to common shareholders				0.0	0.0
Cash dividends paid to parent				0.0	0.0
Capital contribution to subsidiary				(23.5)	(27.3)
Return of capital to OneBeacon U.S. Enterprises Holdings, Inc.				0.0	0.0
Payments on capital lease obligation				0.0	0.0
Net cash used for financing activities				(23.5)	(27.3)
Net increase (decrease) in cash during period				0.0	1.0
Cash balance at beginning of period				0.1	0.6
Cash balance at end of period	$ 0.1	$ 0.1	$ 1.6	$ 0.1	$ 1.6