10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2013

OR

¨ 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: 1-15259

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

(Exact name of registrant as specified in its charter)

Bermuda	98-0214719
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

110 Pitts Bay Road Pembroke HM08 Bermuda	P.O. Box HM 1282 Hamilton HM FX Bermuda
(Address of principal executive offices)	(Mailing Address)

(441) 296-5858

(Registrant’s telephone number, including area code)

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  ¨

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  ¨

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

Large Accelerated Filer	x	Accelerated Filer	¨
Non-accelerated Filer	¨	Smaller Reporting Company	¨

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

Indicate the number of shares outstanding (net of treasury shares) of each of the issuer’s classes of common shares as of July 31, 2013

Title	Outstanding
Common Shares, par value $1.00 per share	26,663,066

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

INDEX

PART I.	FINANCIAL INFORMATION	3
Item 1.	Consolidated Financial Statements (unaudited)
	Consolidated Balance Sheets as of June 30, 2013 and December 31, 2012	3
	Consolidated Statements of Income for the three and six months ended June 30, 2013 and 2012	4
	Consolidated Statements of Comprehensive Income for the three and six months ended June  30, 2013 and 2012	5
	Consolidated Statements of Cash Flows for the six months ended June 30, 2013 and 2012	6
	Notes to Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	36
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	47
Item 4.	Controls and Procedures	49
PART II.	OTHER INFORMATION	49
Item 1.	Legal Proceedings	49
Item 1a.	Risk Factors	49
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	50
Item 3.	Defaults Upon Senior Securities	50
Item 4.	Mine Safety Disclosures	50
Item 5.	Other Information	50
Item 6.	Exhibits	50

2

PART I. FINANCIAL INFORMATION

Item 1. Consolidated Financial Statements

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

CONSOLIDATED BALANCE SHEETS

(in millions, except number of shares and per share amounts)

	June 30, 2013			December 31, 2012*
	(Unaudited)
Assets
Investments:
Fixed maturities, at fair value:
Available-for-sale (cost: 2013 - $2,752.9; 2012 - $2,993.1)	$	2,794.6		$	3,154.0
Equity securities, at fair value (cost: 2013 - $414.1; 2012 - $383.5)		599.7			531.4
Other investments (cost: 2013 - $313.7; 2012 - $284.8)		311.6			281.0
Short-term investments, at fair value (cost: 2013 - $279.7; 2012 - $234.3)		279.5			234.3
Total investments		3,985.4			4,200.7
Cash		102.0			95.8
Accrued investment income		27.4			30.3
Premiums receivable		448.6			361.0
Reinsurance recoverables		1,249.7			1,320.9
Goodwill		153.8			153.8
Intangible assets, net of accumulated amortization		88.7			91.5
Current income taxes receivable, net		8.9			12.9
Deferred acquisition costs, net		111.9			99.4
Ceded unearned premiums		239.7			193.6
Other assets		159.2			129.0
Total assets	$	6,575.3		$	6,688.9
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	3,233.9		$	3,223.5
Unearned premiums		809.7			730.2
Accrued underwriting expenses		123.7			105.0
Ceded reinsurance payable, net		420.7			612.1
Funds held		32.0			33.7
Senior unsecured fixed rate notes		143.8			143.8
Other indebtedness		64.0			63.8
Junior subordinated debentures		193.3			193.3
Deferred tax liabilities, net		29.0			43.8
Other liabilities		34.1			25.6
Total liabilities		5,084.2			5,174.8
Shareholders’ equity:
Common shares - $1.00 par, 500,000,000 shares authorized; 33,970,108 and 31,384,271 shares issued at June 30, 2013 and December 31, 2012, respectively		34.0			31.4
Additional paid-in capital		823.6			722.7
Treasury shares (7,213,189 and 6,459,613 shares at June 30, 2013 and December 31, 2012, respectively)		(235.6	)		(205.5	)
Retained earnings		733.5			776.0
Accumulated other comprehensive income, net of taxes		135.6			189.5
Total shareholders’ equity		1,491.1			1,514.1
Total liabilities and shareholders’ equity	$	6,575.3		$	6,688.9

* Derived from audited consolidated financial statements

See accompanying notes.

3

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

CONSOLIDATED STATEMENTS OF INCOME

(in millions, except number of shares and per share amounts)

(Unaudited)

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Premiums and other revenue:
Earned premiums	$	327.5		$	290.2		$	631.7		$	567.5
Net investment income		25.3			30.0			53.2			61.4
Fee income, net		0.2			0.5			0.2			1.8
Net realized investment gains (losses)		11.0			(2.7	)		20.5			10.4
Total revenue		364.0			318.0			705.6			641.1
Expenses:
Losses and loss adjustment expenses		192.7			175.8			363.2			341.6
Other reinsurance-related expenses		4.7			6.9			9.8			13.8
Underwriting, acquisition and insurance expenses		124.6			114.6			251.3			228.3
Interest expense		5.1			5.5			10.0			11.2
Foreign currency exchange (gain) loss		(5.9	)		(9.8	)		(9.0	)		(6.9	)
Total expenses		321.2			293.0			625.3			588.0
Income before income taxes		42.8			25.0			80.3			53.1
Provision for income taxes		11.1			1.0			15.9			9.5
Net income	$	31.7		$	24.0		$	64.4		$	43.6
Net income per common share:
Basic	$	1.18		$	0.85		$	2.37		$	1.53
Diluted	$	1.13		$	0.84		$	2.29		$	1.51
Dividend declared per common share:	$	0.15		$	0.12		$	0.30		$	0.24
Weighted average common shares:
Basic		26,962,397			28,254,520			27,103,917			28,525,400
Diluted		28,009,590			28,679,480			28,082,545			28,905,574
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Net realized investment gains (losses) before other-than-temporary impairment losses	$	11.4		$	(1.9	)	$	25.7		$	11.3
Other-than-temporary impairment losses recognized in earnings
Other-than-temporary impairment losses on fixed maturities		(0.3	)		(0.3	)		(0.3	)		(0.3	)
Other-than-temporary impairment losses on equity securities		(0.1	)		(0.5	)		(1.5	)		(0.6	)
Other-than-temporary impairment losses on other investments		0.0			0.0			(3.4	)		0.0
Non-credit portion of losses recognized in other comprehensive income		0.0			0.0			0.0			0.0
Impairment losses recognized in earnings		(0.4	)		(0.8	)		(5.2	)		(0.9	)
Net realized investment gains (losses)	$	11.0		$	(2.7	)	$	20.5		$	10.4

See accompanying notes.

4

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in millions)

(Unaudited)

	For the Three  Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Net income	$	31.7		$	24.0		$	64.4		$	43.6
Other comprehensive (loss) income:
Foreign currency translation adjustments		(1.9	)		(4.4	)		(1.9	)		(3.3	)
Defined benefit pension plan:
Net loss arising during the period		0.0			(0.9	)		0.0			(0.9	)
Unrealized gains (losses) on securities:
Gains (losses) arising during the period		(82.2	)		(10.1	)		(58.0	)		42.3
Reclassification adjustment for gains included in net income		(14.3	)		(4.0	)		(15.0	)		(9.4	)
Other comprehensive income (loss) before tax		(98.4	)		(19.4	)		(74.9	)		28.7
Income tax provision related to other comprehensive income:
Defined benefit pension plan:
Net loss arising during the period		0.0			(0.3	)		0.0			(0.3	)
Unrealized gains (losses) on securities:
Gains (losses) arising during the period		(26.7	)		(0.1	)		(16.3	)		14.1
Reclassification adjustment for gains included in net income		(4.8	)		(1.2	)		(4.7	)		(2.8	)
Income tax provision related to other comprehensive income (loss)		(31.5	)		(1.6	)		(21.0	)		11.0
Other comprehensive (loss) income, net of tax		(66.9	)		(17.8	)		(53.9	)		17.7
Comprehensive (loss) income	$	(35.2	)	$	6.2		$	10.5		$	61.3

See accompanying notes.

5

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in millions)

(Unaudited)

	For the Six Months Ended June 30,
	2013			2012
Cash flows from operating activities:
Net income	$	64.4		$	43.6
Adjustments to reconcile net income to net cash used by operating activities:
Amortization and depreciation		18.7			16.3
Share-based payments expense		14.6			4.0
Deferred income tax provision, net		6.0			4.0
Net realized investment gains		(20.5	)		(10.4	)
Loss on disposals of fixed assets, net		0.0			0.2
Change in:
Accrued investment income		2.9			1.4
Receivables		(17.7	)		45.5
Deferred acquisition costs		(12.0	)		(3.2	)
Ceded unearned premiums		(47.2	)		(35.7	)
Reserves for losses and loss adjustment expenses		12.1			(78.8	)
Unearned premiums		81.3			73.1
Ceded reinsurance payable and funds held		(192.5	)		(82.8	)
Income taxes		4.0			(10.4	)
Accrued underwriting expenses		8.0			4.2
Other, net		(18.3	)		0.6
Cash used by operating activities		(96.2	)		(28.4	)
Cash flows from investing activities:
Sales of fixed maturity investments		874.7			727.8
Maturities and mandatory calls of fixed maturity investments		210.9			205.9
Sales of equity securities		39.4			5.5
Sales of other investments		5.8			2.3
Purchases of fixed maturity investments		(833.1	)		(781.8	)
Purchases of equity securities		(64.4	)		(73.6	)
Purchases of other investments		(28.8	)		(11.2	)
Change in foreign regulatory deposits and voluntary pools		0.7			(13.0	)
Change in short-term investments		(49.2	)		(3.2	)
Settlements of foreign currency exchange forward contracts		(2.7	)		(0.8	)
Purchases of fixed assets		(13.0	)		(19.2	)
Other, net		(0.4	)		(0.3	)
Cash provided by investing activities		139.9			38.4
Cash flows from financing activities:
Activity under stock incentive plans		1.5			0.2
Repurchase of Company’s common shares		(30.9	)		(27.8	)
Payment of cash dividend to common shareholders		(7.8	)		(6.2	)
Cash used by financing activities		(37.2	)		(33.8	)
Effect of exchange rate changes on cash		(0.3	)		(1.3	)
Change in cash		6.2			(25.1	)
Cash, beginning of period		95.8			100.9
Cash, end of period	$	102.0		$	75.8

See accompanying notes.

6

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Basis of Presentation

The accompanying consolidated financial statements of Argo Group International Holdings, Ltd. (“Argo Group,” “we” or the “Company”) and its subsidiaries have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. The preparation of interim financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The major estimates reflected in our consolidated financial statements include, but are not limited to, the reserves for losses and loss adjustment expenses, reinsurance recoverables, including the reinsurance recoverables allowance for doubtful accounts, estimates of written and earned premiums, reinsurance premium receivable, the fair value of investments and the assessment of potential impairment, the valuation of goodwill and intangibles and our deferred tax asset valuation allowance. Actual results could differ from those estimates. Certain financial information that normally is included in annual financial statements, including certain financial statement footnotes, prepared in accordance with GAAP, is not required for interim reporting purposes and has been condensed or omitted. These statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2012, filed with the Securities and Exchange Commission on February 28, 2013.

The interim financial information as of, and for the three and six months ended, June 30, 2013 and 2012 is unaudited. However, in the opinion of management, the interim information includes all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the results presented for the interim periods. The operating results for the interim periods are not necessarily indicative of the results to be expected for the full year. All significant intercompany amounts have been eliminated in consolidation.

2. Recently Issued Accounting Standards

In December 2011, with further clarification issued in January 2013, the Financial Accounting Standards Board (“FASB”) issued an accounting update requiring disclosures about offsetting and related arrangements to enable users of financial statements to understand the effect of those arrangements on its financial position. Entities are required to disclose both gross information and net information about both instruments and transactions eligible for offset in the statement of financial position and instruments and transactions subject to an agreement similar to a master netting arrangement. This update is applicable to derivatives including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements and securities borrowing and securities lending arrangements. The update was effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. The disclosures required by this update should be provided retrospectively for all comparative periods presented. The adoption of this update did not have an impact on our financial results and disclosures.

In July 2012, the FASB issued an accounting update that allows an entity the option to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired. The more-likely-than-not threshold is defined as having a likelihood of more than 50 percent. If the more-likely-than-not threshold is met, an entity is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount in accordance with accounting guidance. The update was effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption was permitted, including for annual and interim impairment tests performed as of a date before July 27, 2012, if an entity’s financial statements for the most recent annual or interim period have not yet been issued or, for nonpublic entities, have not yet been made available for issuance.

7

In February 2013, the FASB issued an accounting update to improve the reporting of reclassifications out of accumulated other comprehensive income. An entity is required to report the effect of significant reclassifications, by component, out of accumulated other comprehensive income on the respective line items in net income if the item is required under GAAP to be reclassified in its entirety in the same reporting period. The required disclosures of the update are allowed either in the Statement of Income or in the notes. The amendments in the update were effective for reporting periods beginning after December 15, 2012. See Note 6, “Accumulated Other Comprehensive Income” for the required disclosures.

In February 2013, the FASB issued amendments to “Liabilities” (Topic 405) in order to resolve diversity in practice related to accounting for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. The amendments require an entity to measure the liability as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors, and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. The amendments in this update are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, but early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented for those obligations resulting from joint and several liability arrangements within the update’s scope that exist at the beginning of an entity’s fiscal year of adoption. We do not anticipate this update will have an impact on our financial results and disclosures.

In March 2013, the FASB issued an amendment to “Consolidation” (Topic 810) to resolve the diversity in practice related to the release of the cumulative translation adjustment into net income when a parent sells a part of all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The amendments in the update are effective prospectively for fiscal years, and interim reporting periods within those years, beginning after December 15, 2013, but early adoption is permitted. The amendments should be applied prospectively to derecognition events occurring after the effective date with no adjustment to prior periods. We do not anticipate this update will have an impact on our financial results and disclosures.

8

3. Investments

Composition of Invested Assets

The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investments as of June 30, 2013 and December 31, 2012 were as follows:

June 30, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	302.1	$	3.8	$	0.6	$	305.3
Non-U.S. Governments		58.0		0.4		2.9		55.5
Obligations of states and political subdivisions		641.1		26.6		12.0		655.7
Credit-Financial		368.1		14.5		3.7		378.9
Credit-Industrial		389.1		16.4		5.4		400.1
Credit-Utility		174.7		6.3		1.9		179.1
Structured securities:
CMO/MBS-agency (1)		289.3		11.1		2.7		297.7
CMO/MBS-non agency		9.5		0.9		0.0		10.4
CMBS (2)		107.6		3.6		1.5		109.7
ABS-residential (3)		8.6		0.2		0.5		8.3
ABS-non residential		80.7		0.6		0.3		81.0
Foreign denominated:
Governments		202.0		1.8		9.0		194.8
Credit		122.1		2.1		6.1		118.1
Total fixed maturities		2,752.9		88.3		46.6		2,794.6
Equity securities		414.1		190.3		4.7		599.7
Other investments		313.7		2.7		4.8		311.6
Short-term investments		279.7		0.0		0.2		279.5
Total investments	$	3,760.4	$	281.3	$	56.3	$	3,985.4
December 31, 2012	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	401.1	$	9.3	$	0.0	$	410.4
Non-U.S. Governments		53.1		3.6		0.1		56.6
Obligations of states and political subdivisions		551.7		44.9		0.5		596.1
Credit-Financial		382.4		25.7		0.7		407.4
Credit-Industrial		428.4		31.1		0.7		458.8
Credit-Utility		189.9		12.6		0.4		202.1
Structured securities:
CMO/MBS-agency (1)		375.1		20.2		0.2		395.1
CMO/MBS-non agency		12.5		1.0		0.2		13.3
CMBS (2)		109.5		5.7		0.2		115.0
ABS-residential (3)		10.1		0.2		0.8		9.5
ABS-non residential		81.3		1.2		0.0		82.5
Foreign denominated:
Governments		262.1		9.2		4.3		267.0
Credit		135.9		6.1		1.8		140.2
Total fixed maturities		2,993.1		170.8		9.9		3,154.0
Equity securities		383.5		153.0		5.1		531.4
Other investments		284.8		1.2		5.0		281.0
Short-term investments		234.3		0.1		0.1		234.3
Total investments	$	3,895.7	$	325.1	$	20.1	$	4,200.7

⁽¹⁾ Collateralized mortgage obligations/mortgage-backed securities (“CMO/MBS”).

⁽²⁾ Commercial mortgage-backed securities (“CMBS”).

⁽³⁾ Asset-backed securities (“ABS”).

9

Included in total investments at June 30, 2013 and December 31, 2012 is $89.2 million and $143.9 million, respectively, of assets, at fair value, managed on behalf of the trade capital providers, who are third party capital participants that provide underwriting capital to our Syndicate 1200 segment.

Contractual Maturity

The amortized cost and fair values of fixed maturity investments as of June 30, 2013, by contractual maturity, were as follows:

(in millions)	Amortized Cost		Fair Value
Due in one year or less	$	203.5	$	204.6
Due after one year through five years		1,041.7		1,052.8
Due after five years through ten years		727.0		750.0
Thereafter		285.0		280.1
Structured securities		495.7		507.1
Total	$	2,752.9	$	2,794.6

The expected maturities may differ from the contractual maturities because debtors may have the right to call or prepay obligations.

Unrealized Losses and Other-Than-Temporary Impairments

An aging of unrealized losses on our investments at June 30, 2013 and December 31, 2012 is presented below:

June 30, 2013	Less Than One Year					One Year or Greater				Total
(in millions)	Fair Value			Unrealized Losses		Fair Value		Unrealized Losses		Fair Value			Unrealized Losses
Fixed maturities
USD denominated:
U.S. Governments	$	66.8		$	0.6	$	0.0	$	0.0	$	66.8		$	0.6
Non-U.S. Governments (1)		40.0			2.9		0.2		0.0		40.2			2.9
Obligations of states and political subdivisions		220.1			12.0		0.0		0.0		220.1			12.0
Credit-Financial		116.8			3.6		1.5		0.1		118.3			3.7
Credit-Industrial		123.6			5.3		0.1		0.1		123.7			5.4
Credit-Utility		46.5			1.9		0.0		0.0		46.5			1.9
Structured securities:
CMO/MBS-agency (1)		80.2			2.7		0.7		0.0		80.9			2.7
CMBS		31.2			1.5		0.0		0.0		31.2			1.5
ABS-residential		0.0			0.0		4.6		0.5		4.6			0.5
ABS-non residential		49.3			0.3		0.0		0.0		49.3			0.3
Foreign denominated:
Governments		173.2			9.0		0.0		0.0		173.2			9.0
Credit		110.7			6.1		0.0		0.0		110.7			6.1
Total fixed maturities		1,058.4			45.9		7.1		0.7		1,065.5			46.6
Equity securities		58.0			4.7		0.0		0.0		58.0			4.7
Other investments		(4.8	)		4.8		0.0		0.0		(4.8	)		4.8
Short-term investments		0.0			0.2		0.0		0.0		0.0			0.2
Total	$	1,111.6		$	55.6	$	7.1	$	0.7	$	1,118.7		$	56.3

⁽¹⁾  Unrealized losses one year or greater are less than $0.1 million.

10

December 31, 2012	Less Than One Year				One Year or Greater				Total
(in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Fixed maturities
USD denominated:
U.S. Governments (1)	$	11.9	$	0.0	$	0.0	$	0.0	$	11.9	$	0.0
Non-U.S. Governments (2)		8.5		0.1		0.5		0.0		9.0		0.1
Obligations of states and political subdivisions		28.2		0.3		0.8		0.2		29.0		0.5
Credit-Financial		25.0		0.2		8.6		0.5		33.6		0.7
Credit-Industrial		32.2		0.4		3.0		0.3		35.2		0.7
Credit-Utility		8.4		0.2		0.8		0.2		9.2		0.4
Structured securities:
CMO/MBS-agency (2)		26.4		0.2		0.3		0.0		26.7		0.2
CMO/MBS-non agency		1.7		0.2		0.0		0.0		1.7		0.2
CMBS (1)		5.7		0.0		3.5		0.2		9.2		0.2
ABS-residential		0.0		0.0		3.9		0.8		3.9		0.8
ABS-non residential (1) (2)		13.7		0.0		0.2		0.0		13.9		0.0
Foreign denominated:
Governments (2)		180.5		4.3		0.3		0.0		180.8		4.3
Credit		76.3		1.8		0.0		0.0		76.3		1.8
Total fixed maturities		418.5		7.7		21.9		2.2		440.4		9.9
Equity securities		60.2		4.2		6.3		0.9		66.5		5.1
Other investments		11.6		5.0		0.0		0.0		11.6		5.0
Short-term investments		0.0		0.1		0.0		0.0		0.0		0.1
Total	$	490.3	$	17.0	$	28.2	$	3.1	$	518.5	$	20.1

⁽¹⁾  Unrealized losses less than one year are less than $0.1 million.

⁽²⁾  Unrealized losses one year or greater are less than $0.1 million.

We hold a total of 6,413 securities, of which 2,160 were in an unrealized loss position for less than one year and 18 were in an unrealized loss position for a period one year or greater as of June 30, 2013. Unrealized losses greater than twelve months on fixed maturities were the result of a number of factors, including increased credit spreads, foreign currency fluctuations, and higher market yields relative to the date the securities were purchased, and for structured securities, by the performance of the underlying collateral as well. We also considered that we do not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be maturity. We do not consider these investments to be other-than-temporarily impaired at June 30, 2013.

We regularly evaluate our investments for impairment. For fixed maturity securities, the evaluation for a credit loss is generally based on the present value of expected cash flows of the security as compared to the amortized book value. For MBS and residential ABS securities, frequency and severity of loss inputs are used in projecting future cash flows of the securities. Loss frequency is measured as the credit default rate, which includes such factors as loan-to-value ratios and credit scores of borrowers. Loss severity includes such factors as trends in overall housing prices and house prices that are obtained at foreclosure. We recognized other-than-temporary losses on our fixed maturities portfolio of $0.3 million and $0.3 million for the three and six months ended June 30, 2013, respectively. We recognized other-than-temporary losses on our fixed maturities portfolio of $0.3 million and $0.3 million for the three and six months ended June 30, 2012, respectively. For equity securities and other investments, the length of time and the amount of decline in fair value are the principal factors in determining other-than-temporary impairment. We recognized other-than-temporary losses on our equity portfolio of $0.1 million and $1.5 million for the three and six months ended June 30, 2013, respectively. We recognized other-than-temporary losses on our equity portfolio of $0.5 million and $0.6 million for the three and six months ended June 30, 2012, respectively. We recognized other-than-temporary losses

11

on our other investments of $0.0 and $3.4 million for the three and six months ended June 30, 2013. We did not recognize any other-than-temporary losses on our other investments in 2012. In situations where we did not recognize other-than-temporary losses on investments in our equity portfolio, we have evaluated the near-term prospects of the investment in relation to the severity and duration of the impairment and based on that evaluation have the ability and intent to hold these investments until a recovery of fair value.

Realized Gains and Losses

The following table presents the Company’s gross realized investment gains (losses) for the three and six months ended June 30:

(in millions)	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Realized gains
Fixed maturities	$	10.2		$	7.2		$	21.7		$	15.5
Equity securities		7.2			0.2			7.7			0.2
Other investments		6.5			1.6			17.6			13.1
Short-term investments		0.0			0.1			0.1			0.3
Gross realized gains		23.9			9.1			47.1			29.1
Realized losses
Fixed maturities		(1.9	)		(2.2	)		(8.4	)		(5.1	)
Equity securities		(0.7	)		(0.2	)		(0.7	)		(0.3	)
Other investments		(9.8	)		(8.3	)		(12.1	)		(12.1	)
Short-term investments		(0.1	)		(0.3	)		(0.2	)		(0.3	)
Other-than-temporary impairment losses on fixed maturities		(0.3	)		(0.3	)		(0.3	)		(0.3	)
Other-than-temporary impairment losses on equity securities		(0.1	)		(0.5	)		(1.5	)		(0.6	)
Other-than-temporary impairment losses on other investments		0.0			0.0			(3.4	)		0.0
Gross realized losses		(12.9	)		(11.8	)		(26.6	)		(18.7	)
Net realized investment (losses) gains	$	11.0		$	(2.7	)	$	20.5		$	10.4

We enter into short-term, currency spot and forward contracts to mitigate foreign exchange rate exposure for certain non-U.S. Dollar denominated fixed maturity investments. The forward contracts used are typically less than sixty days and are renewed, as long as the non-U.S. Dollar denominated fixed maturity investments are held in our portfolio. These forward contracts are designated as fair value hedges for accounting purposes.

Foreign exchange long positions offset by foreign exchange forward contracts resulted in realized losses of less than $0.1 million for the three and six months ended June 30, 2013, respectively and $0.2 million and $0.2 million for the three and six months ended June 30, 2012, respectively, and are reflected in realized gains and losses in the Consolidated Statements of Income and in the table above. As of June 30, 2013 and 2012, we hedged $2.0 million and $2.3 million, respectively, of certain holdings in non-U.S. Dollar denominated fixed maturity investments with $1.9 million and $2.3 million, respectively, of foreign exchange contracts.

We also enter into foreign currency exchange forward contracts to manage currency exposure on losses related to global catastrophe events. These currency forward contracts are carried at fair value in the Consolidated Balance Sheets in “Other investments”. The realized and unrealized gains and losses are included in realized gains or losses in the Consolidated Statements of Income. The notional amount of the currency forward contracts was $68.2 million and $113.2 million as of June 30, 2013 and 2012, respectively. The fair value of the currency forward contracts was a loss of $4.8 million and a loss of $0.4 million as of June 30, 2013 and 2012, respectively. For the three and six months ended June 30, 2013 and 2012, we recognized $3.9 million and $4.6 million in net realized losses and $0.5 million and $3.9 million in net realized gains, respectively, from the currency forward contracts.

12

Regulatory Deposits, Pledged Securities and Letters of Credit

At June 30, 2013, the amortized cost and fair value of investments on deposit for regulatory purposes and reinsurance were $212.9 million and $221.9 million, respectively.

Investments with an amortized cost of $245.7 million and fair value of $247.9 million were pledged as collateral in support of irrevocable letters of credit at June 30, 2013. These assets support irrevocable letters of credit issued under the terms of certain reinsurance agreements in respect of reported loss and loss expense reserves in the amount of $68.4 million and $124.9 million for our Corporate member’s capital as security to support the underwriting business at Lloyd’s.

At June 30, 2013, our Corporate member’s capital supporting our Lloyd’s business consisted of:

Letters of credit	$	124.9
Fixed maturities, at fair value		154.6
Short-term investments, at fair value		0.1
Total securities and letters of credit pledged to Lloyd’s	$	279.6

Fair Value Measurements

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability, or in the absence of a principal market, the most advantageous market. Market participants are buyers and sellers in the principal (or most advantageous) market that are independent, knowledgeable, able to transact for the asset or liability and willing to transfer the asset or liability.

Valuation techniques consistent with the market approach, income approach and/or cost approach are used to measure fair value. The inputs of these valuation techniques are categorized into three levels.

• Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that can be accessed at the reporting date. We define actively traded as a security that has traded in the past seven days. We receive one quote per instrument for Level 1 inputs.

• Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. We receive one quote per instrument for Level 2 inputs.

• Level 3 inputs are unobservable inputs. Unobservable inputs reflect our own assumptions about the assumptions market participants would use in pricing the asset or liability based on the best information available in the circumstances.

We receive fair value prices from third-party pricing services and our outside investment managers. These prices are determined using observable market information such as dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things. We have reviewed the processes used by the third-party providers for pricing the securities, and have determined that these processes result in fair values consistent with GAAP requirements. In addition, we review these prices for reasonableness, and have not adjusted any prices received from the third-party providers as of June 30, 2013. A description of the valuation techniques we use to measure assets at fair value is as follows:

13

Fixed Maturities (Available-for-Sale) Levels 1 and 2:

• United States Treasury securities are typically valued using Level 1 inputs. For these securities, we obtain fair value measurements from third-party pricing services using quoted prices (unadjusted) in active markets at the reporting date.

• United States Government agencies, non-U.S. Government securities, obligations of states and political subdivisions, credit securities and foreign denominated securities are reported at fair value using Level 2 inputs. For these securities, we obtain fair value measurements from third-party pricing services. Observable data may include dealer quotes, market spreads, yield curves, live trading levels, trade execution data, credit information and the security’s terms and conditions, among other things.

• CMO/MBS agency securities are reported at fair value using Level 2 inputs. For these securities, we obtain fair value measurements from third-party pricing services. Observable data may include dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things.

• CMO/MBS non-agency, CMBS, ABS residential, and ABS non-residential securities are reported at fair value using Level 2 inputs. For these securities, we obtain fair value measurements from third-party pricing services. Observable data may include dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things.

Fixed Maturities (Available-for-Sale) Level 3:

• Corporate securities reported at fair value using Level 3 inputs in 2012 were infrequently traded securities valued by an independent investment manager using unobservable inputs. These securities were sold in 2012.

Equity Securities Level 1: Equity securities are principally reported at fair value using Level 1 inputs. For these securities, we obtain fair value measurements from a third party pricing service using quoted prices (unadjusted) in active markets at the reporting date.

Equity Securities Level 2: We own interests in mutual funds that are reported at fair value using Level 2 inputs. The valuations are based on the funds’ net asset value per share, determined weekly or at the end of each month. The underlying assets in the funds are valued primarily on the basis of closing market quotations or official closing prices on each valuation day.

Equity Securities Level 3: We own certain equity securities that are reported at fair value using Level 3 inputs. The valuation techniques for these securities include the following:

• Fair value measurements are obtained from the National Association of Insurance Commissioners’ Security Valuation Office at the reporting date.

• Fair value measurements for an investment in an equity fund obtained by applying final prices provided by the administrator of the fund, which is based upon certain estimates and assumptions.

Other Investments Level 2: Foreign regulatory deposits are assets held in trust in jurisdictions where there is a legal and regulatory requirement to maintain funds locally in order to protect policyholders. Lloyd’s is the appointed investment manager for the funds. These assets are invested in short term government securities, agency securities

14

and corporate bonds and are valued using Level 2 inputs based upon values obtained from Lloyd’s. Foreign currency future contracts are valued by our counterparty using market driven foreign currency exchange rates and are considered Level 2 investments.

Short-term Investments: Short-term investments are principally reported at fair value using Level 1 inputs, with the exception of short-term corporate bonds reported at fair value using Level 2 inputs as described in the fixed maturities section above. Values for the investments categorized as Level 1 are obtained from various financial institutions as of the reporting date.

Other Assets Level 3: We have one reinsurance contract deemed a derivative in 2013 and two reinsurance contracts deemed derivatives in 2012. The fair values were estimated by management taking into account changes in the market for catastrophic bond reinsurance contracts with similar economic characteristics and potential recoveries from events preceding the valuation date. See Note 11 “Derivative Instruments” for related disclosures.

Transfers Between Level 1 and Level 2 Securities: There were no transfers between Level 1 and Level 2 securities during the three or six months ended June 30, 2013.

Based on an analysis of the inputs, our financial assets measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012 have been categorized as follows:

(in millions)	June 30, 2013		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	305.3	$	143.0	$	162.3	$	0.0
Non-U.S. Governments		55.5		0.0		55.5		0.0
Obligations of states and political subdivisions		655.7		0.0		655.7		0.0
Credit-Financial		378.9		0.0		378.9		0.0
Credit-Industrial		400.1		0.0		400.1		0.0
Credit-Utility		179.1		0.0		179.1		0.0
Structured securities:
CMO/MBS-agency		297.7		0.0		297.7		0.0
CMO/MBS-non agency		10.4		0.0		10.4		0.0
CMBS		109.7		0.0		109.7		0.0
ABS-residential		8.3		0.0		8.3		0.0
ABS-non residential		81.0		0.0		81.0		0.0
Foreign denominated:
Governments		194.8		0.0		194.8		0.0
Credit		118.1		0.0		118.1		0.0
Total fixed maturities		2,794.6		143.0		2,651.6		0.0
Equity securities		599.7		515.5		82.3		1.9
Other investments		126.4		0.0		126.4		0.0
Short-term investments		279.5		255.3		24.2		0.0
Other assets		3.3		0.0		0.0		3.3
	$	3,803.5	$	913.8	$	2,884.5	$	5.2

^(a)  Quoted prices in active markets for identical assets

^(b)  Significant other observable inputs

^(c)  Significant unobservable inputs

15

(in millions)	December 31, 2012		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	410.4	$	219.5	$	190.9	$	0.0
Non-U.S. Governments		56.6		0.0		56.6		0.0
Obligations of states and political subdivisions		596.1		0.0		596.1		0.0
Credit-Financial		407.4		0.0		407.4		0.0
Credit-Industrial		458.8		0.0		458.8		0.0
Credit-Utility		202.1		0.0		202.1		0.0
Structured securities:
CMO/MBS-agency		395.1		0.0		395.1		0.0
CMO/MBS-non agency		13.3		0.0		13.3		0.0
CMBS		115.0		0.0		115.0		0.0
ABS-residential		9.5		0.0		9.5		0.0
ABS-non residential		82.5		0.0		82.5		0.0
Foreign denominated:
Governments		267.0		0.0		267.0		0.0
Credit		140.2		0.0		140.2		0.0
Total fixed maturities		3,154.0		219.5		2,934.5		0.0
Equity securities		531.4		469.0		60.6		1.8
Other investments		132.0		0.0		132.0		0.0
Short-term investments		234.3		201.1		33.2		0.0
Other assets		6.9		0.0		0.0		6.9
	$	4,058.6	$	889.6	$	3,160.3	$	8.7

^(a)  Quoted prices in active markets for identical assets

^(b)  Significant other observable inputs

^(c)  Significant unobservable inputs

The fair value measurements in the tables above do not agree to “Total investments” on the Consolidated Balance Sheets as they exclude certain other investments that are accounted for under the equity-method of accounting and include reinsurance contracts that are classified as Other assets.

A reconciliation of the beginning and ending balances for the investments categorized as Level 3 at June 30, 2013 and December 31, 2012 are as follows:

Fair Value Measurements Using Unobservable Inputs (Level 3)

(in millions)	Equity Securities		Other Assets			Total
Beginning balance, January 1, 2013	$	1.8	$	6.9		$	8.7
Transfers into Level 3		0.0		0.0			0.0
Transfers out of Level 3		0.0		0.0			0.0
Total gains or losses (realized/unrealized):
Included in net income		0.0		0.0			0.0
Included in other comprehensive income		0.1		0.0			0.1
Purchases, issuances, sales, and settlements
Purchases		0.0		0.0			0.0
Issuances		0.0		0.0			0.0
Sales		0.0		0.0			0.0
Settlements		0.0		(3.6	)		(3.6	)
Ending balance, June 30, 2013	$	1.9	$	3.3		$	5.2
Amount of total gains or losses for the period included in net income attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2013	$	0.0	$	0.0		$	0.0

16

Fair Value Measurements Using Unobservable Inputs (Level 3)

(in millions)	Credit Financial			Equity Securities			Other Assets			Total
Beginning balance, January 1, 2012	$	0.7		$	2.4		$	9.0		$	12.1
Transfers into Level 3		0.0			0.0			0.0			0.0
Transfers out of Level 3		0.0			0.0			0.0			0.0
Total gains or losses (realized/unrealized):
Included in net income		0.1			0.0			0.0			0.1
Included in other comprehensive income		0.0			0.0			0.0			0.0
Purchases, issuances, sales, and settlements
Purchases		0.0			0.0			0.0			0.0
Issuances		0.0			0.0			0.0			0.0
Sales		(0.8	)		(0.6	)		0.0			(1.4	)
Settlements		0.0			0.0			(2.1	)		(2.1	)
Ending balance, December 31, 2012	$	0.0		$	1.8		$	6.9		$	8.7
Amount of total gains or losses for the period included in net loss attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2012	$	0.0		$	0.0		$	0.0		$	0.0

At June 30, 2013 and December 31, 2012, we did not have any financial assets or financial liabilities measured at fair value on a nonrecurring basis or any financial liabilities on a recurring basis.

4. Shareholders’ Equity

On May 7, 2013, our Board of Directors declared a 10% stock dividend, payable on June 17, 2013, to shareholders of record at the close of business on June 3, 2013. As a result of the stock dividend, 2,447,839 additional shares were issued. Cash was paid in lieu of fractional shares of the Company’s common shares.

On May 7, 2013, our Board of Directors declared a quarterly cash dividend in the amount of $0.15 on each share of common stock outstanding, on a post-stock dividend basis. On June 20, 2013, we paid $4.1 million to our shareholders of record on June 3, 2013. On May 8, 2012, our Board of Directors declared a quarterly cash dividend in the amount of $0.12, on each share of common stock outstanding. On June 15, 2012, we paid $3.1 million to our shareholders of record on June 1, 2012.

For the six months ended June 30, 2013 and 2012, we have paid cash dividends totaling $7.8 million and $6.2 million to our shareholders.

On February 18, 2011, our Board of Directors authorized the repurchase of up to $150.0 million of our common shares (“2011 Repurchase Authorization”). The 2011 Repurchase Authorization supersedes the November 13, 2007 repurchase authorization, which also had authorized the repurchase of up to $150.0 million of our common shares. From inception of the repurchase authorizations through July 31, 2013, we have repurchased 7,313,792 shares of our common stock at an average price of $32.82 for a total cost of $240.0 million. These shares are being held as treasury shares in accordance with the provisions of the Bermuda Companies Act 1981. As of July 31, 2013, availability under the 2011 Repurchase Authorization for future repurchases of our common shares was $36.4 million.

For the three and six months ended June 30, 2013, we repurchased a total of 427,751 and 753,576 common shares for $17.8 million and $30.1 million respectively. A summary of activity from January 1, 2013 through July 31, 2013 follows.

17

For the three and six months ended June 30, 2013, we repurchased 184,430 and 282,030 common shares on the open market for $7.8 million and $11.6 million, respectively. In 2013, we repurchased shares under Securities Exchange Act of 1934 Rule 10b5-1 trading plans as follows:

Date Trading Plan Initiated	2013 Purchase Period	Number of Shares Repurchased	Average Price of Shares Repurchased		Total Cost (in millions)		Repurchase Authorization Year
12/14/2012	01/01/13-01/17/13 (1)	171,480	$	35.41	$	6.0	2011
03/15/2013	03/16/13-05/01/13 (2)	205,452	$	40.75	$	8.3	2011
06/14/2013	06/18/13-07/31/13 (3)	195,217	$	43.47	$	8.5	2011

⁽¹⁾  The above table only reflects the 2013 activity under this Rule 10b5-1 trading plan. In 2012, 117,663 shares were repurchased under this Rule 10b5-1 trading plan for a total cost of $3.9 million. Total shares repurchased in 2012 and 2013 under this Rule 10b5-1 trading plan are 289,143 shares at an average price of $34.58 for a total cost of $9.9 million.

⁽²⁾  Through March 31, 2013, 56,745 shares were repurchased at an average price of $41.17 for a total cost of $2.3 million.

⁽³⁾  Through June 30, 2013, 94,614 shares were repurchased at an average price of $42.26 for a total cost of $4.0 million.

5. Net Income Per Common Share

The following table presents the calculation of net income per common share on a basic and diluted basis for the three and six months ended June 30, 2013 and 2012 (all balances have been adjusted to reflect the effects of the 10% stock dividend):

	For the Three Months				For the Six Months
	Ended June 30,				Ended June 30,
(in millions, except number of shares and per share amounts)	2013		2012		2013		2012
Net income	$	31.7	$	24.0	$	64.4	$	43.6
Weighted average common shares outstanding - basic		26,962,397		28,254,520		27,103,917		28,525,400
Effect of dilutive securities
Equity compensation awards		1,047,193		424,960		978,628		380,174
Weighted average common shares outstanding - diluted		28,009,590		28,679,480		28,082,545		28,905,574
Net income per common share - basic	$	1.18	$	0.85	$	2.37	$	1.53
Net income per common share - diluted	$	1.13	$	0.84	$	2.29	$	1.51

Excluded from the weighted average common shares outstanding calculation at June 30, 2013 and 2012 are 7,213,189 shares and 5,912,227 shares, respectively, which are held as treasury shares. The shares are excluded as of their repurchase date. For the three and six months ended June 30, 2013, equity compensation awards to purchase 22,604 shares of common stock were excluded from the computation of diluted net income per common share as these instruments were anti-dilutive. These instruments expire at varying times from 2013 through 2020. For the three and six months ended June 30, 2012, equity compensation awards to purchase 1,314,243 shares of common stock were excluded from the computation of diluted net income per common share as these instruments were anti-dilutive. These instruments expire at varying times from 2013 through 2019.

6. Accumulated Other Comprehensive Income

In February 2013, the FASB issued Accounting Standards Update 2013-02 that amends Accounting Standards Codification (“ASC”) 220, “Comprehensive Income.” See Note 2, “Recently Issued Accounting Standards” for additional information regarding the provisions of this update. Effective January 1, 2013, we adopted the update prospectively.

18

A summary of changes in accumulated other comprehensive income, net of taxes (where applicable) by component for the three and six months ended June 30, 2013 is presented in the following table:

(in millions)	Foreign currency translation adjustments			Unrealized holding gains on securities			Defined benefit pension plans			Total
Beginning balance, January 1, 2013	$	(8.7	)	$	204.1		$	(5.9	)	$	189.5
Other comprehensive income before reclassifications		0.0			(41.7	)		0.0			(41.7	)
Amounts reclassified from accumulated other comprehensive income		(1.9	)		(10.3	)		0.0			(12.2	)
Net current-period other comprehensive income		(1.9	)		(52.0	)		0.0			(53.9	)
Ending balance, June 30, 2013	$	(10.6	)	$	152.1		$	(5.9	)	$	135.6

The amounts reclassified from accumulated other comprehensive income shown in the above table have been included in the following captions in the Consolidated Statement of Income:

(in millions)	For the Three Months Ended June 30, 2013			For the Six Months Ended June 30, 2013
Unrealized gains and losses on securities
Net realized investment gains	$	(14.3	)	$	(15.0	)
Provision for income taxes		4.8			4.7
Net of taxes	$	(9.5	)	$	(10.3	)

7. Commitments and Contingencies

Argo Group’s subsidiaries are parties to legal actions incidental to their business. Based on the opinion of counsel, management believes that the resolution of these matters will not materially affect our financial condition or results of operations.

8. Income Taxes

We are incorporated under the laws of Bermuda and, under current Bermuda law, are not obligated to pay any taxes in Bermuda based upon income or capital gains. We have received an undertaking from the Supervisor of Insurance in Bermuda pursuant to the provisions of the Exempted Undertakings Tax Protection Act, 2011, which exempts us from any Bermuda taxes computed on profits, income or any capital asset, gain or appreciation, or any tax in the nature of estate duty or inheritance tax, at least until the year 2035.

We do not consider ourselves to be engaged in a trade or business in the United States or the United Kingdom and, accordingly, do not expect to be subject to direct United States or United Kingdom income taxation.

We have subsidiaries based in the United Kingdom that are subject to the tax laws of that country. Under current law, these subsidiaries are taxed at the applicable corporate tax rates. Six of the United Kingdom subsidiaries are deemed to be engaged in business in the United States and are therefore subject to United States corporate tax in respect of a proportion of their United States underwriting business only. Relief is available against the United Kingdom tax liabilities in respect of overseas taxes paid that arise from the underwriting business. Corporate income tax losses incurred in the United Kingdom can be carried forward, for application against future income, indefinitely. Our United Kingdom subsidiaries file separate United Kingdom income tax returns.

We have subsidiaries based in the United States that are subject to the tax laws of that country. Under current law, these subsidiaries are taxed at the applicable corporate tax rates. Our United States subsidiaries file a consolidated United States federal income tax return.

We also have operations in Belgium, Switzerland, Brazil, France, Malta, Spain and Ireland, which also are subject to income taxes imposed by the jurisdiction in which they operate. We have operations in the United Arab Emirates, which are not subject to income tax under the laws of that country.

19

Our income tax provision includes the following components:

	For the Three Months Ended June 30,					For the Six Months Ended June 30,
(in millions)	2013		2012			2013		2012
Current tax provision	$	8.1	$	1.9		$	9.9	$	5.5
Deferred tax provision related to:
Future tax deductions		2.0		(1.5	)		4.4		2.9
Valuation allowance change		1.0		0.6			1.6		1.1
Income tax provision	$	11.1	$	1.0		$	15.9	$	9.5

Our expected income tax provision computed on pre-tax income (loss) at the weighted average tax rate has been calculated as the sum of the pre-tax income (loss) in each jurisdiction multiplied by that jurisdiction’s applicable statutory tax rate. For the three and six months ended June 30, 2013 and 2012, pre-tax income (loss) attributable to our operations and the operations’ effective tax rates were as follows:

	For the Three Months Ended June 30,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	3.9			0.0	%	$	9.9			0.0	%
United States		31.5			26.7	%		8.3			9.7	%
United Kingdom		10.7			25.9	%		9.0			0.7	%
Belgium		0.0	(1)		-39.0	%		0.0	(1)		138.3	%
Brazil		(2.9	)		0.0	%		(1.9	)		-1.1	%
Dubai		0.0			0.0	%		0.1			0.0	%
Ireland		0.0			0.0	%		0.0			0.0	%
Malta		(0.4	)		0.0	%		(0.4	)		0.0	%
Switzerland		0.0	(1)		22.2	%		0.0	(1)		22.3	%
Pre-tax income (loss)	$	42.8					$	25.0

(1) Pre-tax income for the respective period was less than $0.1 million.

	For the Six Months Ended June 30,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	20.0			0.0	%	$	10.2			0.0	%
United States		49.0			23.7	%		33.7			23.4	%
United Kingdom		16.7			25.8	%		13.7			11.0	%
Belgium		0.0	(1)		-35.3	%		0.1			50.5	%
Brazil		(4.7	)		0.0	%		(3.5	)		0.0	%
Dubai		0.0			0.0	%		0.1			0.0	%
Ireland		0.0			0.0	%		(0.1	)		0.0	%
Malta		(0.7	)		0.0	%		(1.1	)		0.0	%
Switzerland		0.0	(1)		19.6	%		0.0	(1)		23.9	%
Pre-tax income (loss)	$	80.3					$	53.1

(2) Pre-tax income for the respective period was less than $0.1 million.

20

A reconciliation of the difference between the provision for income taxes and the expected tax provision at the weighted average tax rate for the three and six months ended June 30, 2013 and 2012 is as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Income tax provision at expected rate	$	12.3		$	4.4		$	19.0		$	13.7
Tax effect of:
Tax-exempt interest		(1.4	)		(1.6	)		(2.8	)		(3.0	)
Dividends received deduction		(0.5	)		(0.5	)		(1.1	)		(0.9	)
Valuation allowance change		1.0			0.6			1.6			1.1
Other permanent adjustments, net		0.0			0.2			(0.9	)		0.7
Adjustment for annualized rate		(0.8	)		0.2			(0.4	)		0.0
United States state tax benefit		(0.1	)		(0.1	)		(0.3	)		(0.2	)
Other foreign adjustments		0.0			0.1			0.0			0.1
Foreign exchange adjustments		0.2			(2.3	)		0.4			(2.0	)
Foreign withholding taxes		0.4			0.0			0.4			0.0
Income tax provision	$	11.1		$	1.0		$	15.9		$	9.5
Income tax provision - Foreign	$	2.7		$	0.2		$	4.3		$	1.6
Income tax provision - United States Federal		8.2			1.1			11.7			8.3
Income tax benefit - United States State		(0.2	)		(0.3	)		(0.5	)		(0.4	)
Foreign withholding tax - United States		0.4			0.0			0.4			0.0
Income tax provision	$	11.1		$	1.0		$	15.9		$	9.5

Our net deferred tax assets (liabilities) are supported by taxes paid in previous periods, the reversal of the taxable temporary differences and the recognition of future income. Management regularly evaluates the recoverability of the deferred tax assets and makes any necessary adjustments to them based upon any changes in management’s expectations of future taxable income. Realization of deferred tax assets is dependent upon our generation of sufficient taxable income in the future to recover tax benefits that cannot be recovered from taxes paid in the carryback period, which is generally two years for net operating losses and three years for capital losses for our operations in the United States. At June 30, 2013, we had a total net deferred tax asset of $25.1 million prior to any valuation allowance. Management has concluded that a valuation allowance is required for a portion of the tax effected net capital loss carryforward of $30.2 million generated from the sale of PXRE Reinsurance Company, and a full valuation allowance is required for the tax effected net operating loss carryforward of $18.7 million from PXRE Corporation and for the tax effected net operating loss carryforward of $1.0 million from ARIS Title Insurance Corporation (“ARIS”). The capital loss carryforward generated from the sale of PXRE Reinsurance Company will expire if not utilized by December 31, 2013. Of the PXRE Corporation loss carryforwards, $17.2 million will expire if not utilized by December 31, 2025 and $1.5 million will expire if not utilized by December 31, 2027. The valuation allowances have been established as Internal Revenue Code Section 382 limits the application of net operating loss and net capital loss carryforwards following an ownership change. Accordingly, a valuation allowance of $54.1 million is required as of June 30, 2013. The loss carryforwards available per year are $2.8 million as required by Internal Revenue Code Section 382. For the six months ended June 30, 2013, the valuation allowance was reduced by $0.5 million pertaining to the use of the PXRE and ARIS loss carryforwards, was increased by $0.3 million pertaining to the Malta operations and was increased by $1.8 million pertaining to the Brazil operations.

21

We had no material unrecognized tax benefits as of June 30, 2013. Our United States subsidiaries are no longer subject to U.S. federal and state income tax examinations by tax authorities for years before 2009. Our United Kingdom subsidiaries are no longer subject to United Kingdom income tax examinations by Her Majesty’s Revenue and Customs for years before 2011.

9. Share-based Compensation

The fair value method of accounting is used for equity-based compensation plans. Under the fair value method, compensation cost is measured based on the fair value of the award at the measurement date and recognized over the requisite service period. We use the Black-Scholes model to estimate the fair values on the measurement date for share options and share appreciation rights (“SARs”). The Black-Scholes model uses several assumptions to value a share award. The volatility assumption is based on the historical change in Argo Group’s stock price over the previous five years preceding the measurement date. The risk-free rate of return assumption is based on the five-year U.S. Treasury constant maturity rate on the measurement date. The expected award life is based upon the average holding period over the history of the incentive plan. The following table summarizes the assumptions we used for the six months ended June 30, 2013 and 2012:

	2013			2012
Risk-free rate of return		1.45	%		1.09	%
Expected dividend yields		1.67	%		1.67	%
Expected award life (years)		5.02			5.03
Expected volatility		31.9	%		32.6	%

All outstanding awards were adjusted to reflect the 10% stock dividend, resulting in a 10% increase to the number of awards outstanding and a 9.09% reduction in the exercise price.

Argo Group’s 2007 Long-Term Incentive Plan

In November 2007, the shareholders of Argo Group approved the 2007 Long-Term Incentive Plan (the “2007 Plan”), which provides for an aggregate of 4.5 million shares of our common stock that may be issued to executives, non-employee directors and other key employees. The share awards may be in the form of share options, SARs, restricted shares, restricted share units, performance units, performance shares or other share-based incentive awards. Shares issued under this plan may be shares that are authorized and unissued or shares that we reacquired, including shares purchased on the open market. Share options and SARs will count as one share for the purposes of the limits under the 2007 Plan; restricted shares, restricted share units, performance units, performance shares or other share-based incentive awards which settle in common shares will count as 2.75 shares for purpose of the limits under the 2007 Plan.

Share options may be in the form of incentive share options, non-qualified share options and restorative options. Share options are required to have an exercise price that is not less than the market value on the date of grant. The term of the share options cannot exceed seven years from the grant date.

A summary of option activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		418,325		$	33.56
Granted		0		$	0.00
Exercised		(52,803	)	$	32.16
Expired or forfeited		(44,830	)	$	34.22
Outstanding at June 30, 2013		320,692		$	33.69

22

Options outstanding under this plan vested over a one to five year period, subject to continued employment. As of December 31, 2012, all options under this plan were fully vested. Expense recognized under this plan for share options was $0.5 million for the six months ended June 30, 2012. Compensation expense from all equity-based compensation awards is included in “Underwriting, acquisition and insurance expense” in the accompanying Consolidated Statements of Income.

A summary of restricted share activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		236,139		$	29.76
Granted		115,288		$	37.86
Vested and issued		(53,034	)	$	30.36
Expired or forfeited		(8,769	)	$	31.39
Outstanding at June 30, 2013		289,624		$	33.10

The restricted shares will vest over two to four years. Expense recognized under this plan for the restricted shares was $1.6 million and $0.8 million for the six months ended June 30, 2013 and 2012, respectively. As of June 30, 2013, there was $7.9 million of total unrecognized compensation cost related to restricted shares.

A summary of stock-settled SARs activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,261,557		$	27.04
Granted		332,004		$	37.21
Exercised		(99,085	)	$	29.26
Expired or forfeited		(124,794	)	$	26.40
Outstanding at June 30, 2013		1,369,682		$	29.35

The stock-settled SARs vest over a one to four year period. Upon exercise of the stock-settled SARs, the employee is entitled to receive shares of our common stock equal to the appreciation of the stock as compared to the exercise price. Expense recognized for the stock-settled SARs was $1.3 and $1.2 million for each of the six months ended June 30, 2013 and 2012. As of June 30, 2013, there was $5.6 million of total unrecognized compensation cost related to stock-settled SARs.

A summary of cash-settled SARs activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,886,124		$	27.35
Granted		556,598		$	37.00
Exercised		(292,189	)	$	28.85
Expired or forfeited		(119,178	)	$	25.62
Outstanding at June 30, 2013		2,031,355		$	30.15

The cash-settled SARs vest over a one to four year period. Upon exercise of the cash-settled SARs, the employee is entitled to receive cash payment for the appreciation in the value of our common stock over the exercise price. We are accounting for the cash-settled SARs as liability awards, which require the awards to be revalued at each reporting period. Expense recognized for the cash-settled SARs was $11.0 million and $1.0 million for the six months ended June 30, 2013 and 2012, respectively. As of June 30, 2013, there was $14.0 million of total unrecognized compensation cost related to cash-settled SARs.

23

Argo Group International Holdings Ltd. Deferred Compensation Plan for Non-Employee Directors

In February 2008, the Board of Directors approved the Argo Group International Holdings, Ltd. Deferred Compensation Plan for Non-Employee Directors (“Directors Plan”), a non-funded and non-qualified deferred compensation plan. Under the Directors Plan, non-employee directors can elect each year to defer payment of 50% or 100% of their cash compensation payable during the next calendar year. During the time that the cash compensation amounts are deferred, such amounts are credited with interest earned at a rate two percent above the prime rate, to be re-set each May 1. In addition, the Directors Plan calls for us to grant a match equal to 75% of the cash compensation amounts deferred in the form of “Stock Units,” which provide directors with the economic equivalent of stock ownership and are credited as a bookkeeping entry to each director’s “Stock Unit Account.” Each Stock Unit is valued at the closing price of our common stock on the national exchange on which it is listed as of the date credited for all purposes under the Directors Plan and fluctuates daily thereafter on that same basis. Distributions from the Directors Plan will occur six months after the non-employee director ceases to be a member of the Board due to retirement or termination without cause or change in control, or immediately upon disability or death. The non-employee directors are responsible for all tax requirements on the deferred compensation and any related earnings. The Directors Plan provides for a Stock Unit Account to be established for each non-employee director upon their election to the Board and credits their account with an initial bookkeeping entry for 1,650 Stock Units. Under the Directors Plan, we recorded compensation expense of $1.2 million and $0.5 million for the six months ended June 30, 2013 and 2012, respectively.

Argonaut Group’s Amended and Restated Stock Incentive Plan

Argonaut Group, Inc.’s Amended and Restated Stock Incentive Plan, as approved by the shareholders (the “Amended Plan”), provided for an aggregate of up to 6,250,000 shares of our common stock that may be issued to certain executives and other key employees. The stock awards were issued in the form of non-qualified stock options and non-vested stock.

A summary of option activity under the Amended Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		210,097		$	33.13
Granted		0		$	0.00
Exercised		(90,368	)	$	29.04
Expired or forfeited		(38,415	)	$	48.71
Outstanding at June 30, 2013		81,314		$	30.33

All options granted under the Amended Plan were fully vested in August 2011.

24

10. Reserves for Losses and Loss Adjustment Expenses

The following table provides a reconciliation of reserves for losses and loss adjustment expenses (“LAE”), net of reinsurance, to the gross amounts reported in the Consolidated Balance Sheets. Reinsurance recoverables in this note exclude paid loss recoverables of $127.4 million and $78.8 million as of June 30, 2013 and 2012, respectively:

	For the Six Months Ended June 30,
(in millions)	2013			2012
Net reserves beginning of the year	$	2,110.9		$	2,336.7
Add:
Net reserves from assumed retroactive insurance contract (1)		0.0			13.0
Losses and LAE incurred during current calendaryear, net of reinsurance:
Current accident year		380.5			349.0
Prior accident years		(17.3	)		(7.4	)
Losses and LAE incurred during calendar year, net of reinsurance		363.2			341.6
Deduct:
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year		73.5			60.2
Prior accident years		290.3			311.1
Losses and LAE payments made during current calendar year, net of reinsurance:		363.8			371.3
Change in participation interest (2)		10.4			(3.1	)
Foreign exchange adjustments		(9.1	)		(7.7	)
Net reserves - end of period		2,111.6			2,309.2
Add:
Reinsurance recoverables on unpaid losses and LAE, end of period		1,122.3			913.9
Gross reserves - end of period	$	3,233.9		$	3,223.1

(1) Amount represents reserves assumed resulting from participation in Brazilian Motor Third-Party Liability Insurance Pool effective January 1, 2012.

(2) Amount represents (decrease) increase in reserves due to change in syndicate participation.

Included in losses and LAE for the six months ended June 30, 2013 was $17.3 million in favorable prior years’ loss reserve development comprised of the following: $14.4 million net favorable development in the Excess and Surplus Lines segment primarily caused by favorable development of $19.9 million in the general and products liability lines, partially offset with $4.7 million of unfavorable development in commercial automobile; $0.1 million of net unfavorable development in the Commercial Specialty segment, primarily driven by $7.0 million unfavorable development in general liability due to increases in claim severity and $2.1 million unfavorable development in automobile liability, offset by $5.9 million favorable development in short tail lines, $2.1 million favorable development in workers compensation and $0.8 million favorable development on an assumed Directors & Officers program; $0.6 million net unfavorable development in the International Specialty segment primarily driven by $3.8 million of unfavorable development from a marine industry loss warranty and crop losses and $0.4 million in unfavorable development in our Brazil unit, partially offset by $2.3 million of favorable development on professional lines due to favorable loss activity and $1.2 million on assumed contract from older years; $3.5 million net favorable development in the Syndicate 1200 segment driven by favorable development in various property classes, partially offset by unfavorable development in the onshore energy and liability classes of business; $0.1 million favorable development in the Runoff Lines segment primarily caused by favorable development related to the 2005 hurricanes, partially offset by unfavorable development related to commutations and the unwinding of the workers compensation reserve discount.

25

Included in losses and LAE for the six months ended June 30, 2012 was $7.4 million in favorable prior years’ loss reserve development comprised of the following: $21.7 million of favorable development in the Excess and Surplus Lines segment primarily driven by $18.1 million of favorable development in the general and products liability lines of business primarily in accident year 2009, $2.0 million of favorable development in the property lines, primarily in accident year 2010 and $1.4 million of favorable development in the automobile liability lines of business, primarily in accident year 2009; $18.0 million of net unfavorable development in the Commercial Specialty segment driven by $22.6 million of unfavorable development in general liability due to increases in claim severity, $2.9 million of unfavorable development in the automobile liability lines of business, partially offset by $6.0 million of favorable development in workers compensation and $1.5 million of favorable development in short-tail lines; $3.6 million of net favorable development in the International Specialty segment primarily driven by $4.6 million of favorable development attributable to short-tail non-catastrophe losses, $0.3 million of favorable development in long-tail professional liability, partially offset by $1.4 million of unfavorable development related to short-tail catastrophe losses primarily due to the 2011 catastrophe events; $2.3 million of net favorable development in the Syndicate 1200 segment primarily driven by favorable development in the property facultative class of business as a claim relating to Hurricane Ike was settled for less than case reserves, partially offset by unfavorable development in the professional indemnity class of business which was driven by an increase in prior year premiums as a result of re-estimation of premium income written through binding authorities; and $2.2 million of net unfavorable development in the Run-off Lines segment driven by $2.0 million of unfavorable development related to risk management run-off reserves due to strengthening the reserve for unallocated loss adjustment expenses, $0.5 million of unfavorable development related to the unwinding of the workers compensation reserve discount, partially offset by $0.3 million of favorable development in the involuntary lines.

In the opinion of management, our reserves represent the best estimate of our ultimate liabilities, based on currently known facts, current law, current technology and assumptions considered reasonable where facts are not known. Due to the significant uncertainties and related management judgments, there can be no assurance that future loss development, favorable or unfavorable, will not occur.

11. Derivative Instruments

Through our subsidiary Argo Re, Ltd., in 2011 we entered into two reinsurance contracts with a special purpose reinsurance company that provided us with protection against certain severe catastrophe events and the occurrence of multiple significant catastrophe events during the same year. The first contract was effective June 18, 2011 and provided coverage of $100 million for hurricanes and earthquakes in the U.S., windstorms in Europe, and earthquakes in Japan based on the occurrence of second and subsequent events on a per-occurrence basis over an 18-month coverage period. Each event had an activation level, which, if attained, put the notes on risk for a subsequent event. Once the coverage had been activated, a second loss during the Coverage Period in excess of the loss trigger level results in a loss to the note holders. The first contract expired in December 2012. The second contract entered into on December 28, 2011 and effective January 1, 2012, provides coverage of $100 million for hurricanes and earthquakes (including fire) in the U.S. and covers losses for the first and subsequent events on a per-occurrence basis over a 24-month coverage period. Both of these transactions ignore the effects of inuring reinsurance, creating the remote possibility of a double recovery on covered events, and are therefore deemed to be derivatives.

We recorded these contracts at fair value, and such fair value is included in “Other assets” in our Consolidated Balance Sheets with any changes in the value reflected in “Other reinsurance-related expenses” in the Consolidated Statements of Income. As there is no quoted fair value available for these derivatives, the fair value was estimated by management taking into account changes in the market for catastrophe bond reinsurance contracts with similar economic characteristics and potential recoveries from events preceding the valuation date. Included in “Other reinsurance-related expenses” for the three and six months ended June 30, 2013 was $4.7 million and $9.8 million, respectively, and $6.9 million and $13.8 million for the three and six months ended June 30, 2012. The expense in each respective period was due to the change in the fair value of the derivatives, principally due to the passage of the transaction’s risk coverage term. Included in “Other assets” in our Consolidated Balance Sheets were $3.3 million and $6.9 million, which represent the fair value of these contracts at June 30, 2013 and December 31, 2012, respectively.

26

The special purpose reinsurance company that is the counterparty to these transactions is a variable interest entity under the provisions of ASC Topic 810-10. Argo Group is not the primary beneficiary of this entity and is therefore not required to consolidate it in its consolidated financial statements.

12. Underwriting, Acquisition and Insurance Expenses

Underwriting, acquisition and insurance expenses for the three and six months ended June 30, 2013 and 2012 were as follows:

	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Commissions	$	65.6		$	51.3		$	117.5		$	100.7
General expenses		66.7			61.5			135.4			122.0
Premium taxes, boards and bureaus		6.1			6.0			12.9			12.1
		138.4			118.8			265.8			234.8
Net (deferral) amortization of policy acquisition costs		(13.8	)		(4.2	)		(14.5	)		(6.5	)
Total underwriting, acquisition and insurance expenses	$	124.6		$	114.6		$	251.3		$	228.3

Included in general expenses for the three and six months ended June 30, 2013, was $4.5 million and $11.0 million in additional expense for our cash settled stock appreciation rights, due to the increase in our stock price.

13. Segment Information

We are primarily engaged in writing property and casualty insurance and reinsurance. We have four ongoing reporting segments: Excess and Surplus Lines, Commercial Specialty, International Specialty and Syndicate 1200. Additionally, we have a Run-off Lines segment for certain products that we no longer write.

We consider many factors, including the nature of each segment’s insurance and reinsurance products, production sources, distribution strategies and the regulatory environment, in determining how to aggregate reporting segments.

In evaluating the operating performance of our segments, we focus on core underwriting and investing results before the consideration of realized gains or losses from the sales of investments. Intersegment transactions are allocated to the segment that initiated the transaction. Realized investment gains are reported as a component of the Corporate and Other segment, as decisions regarding the acquisition and disposal of securities reside with the investment function and are not under the control of the individual business segments. Identifiable assets by segment are those assets used in the operation of each segment.

27

Revenue and income (loss) before income taxes for each segment for the three and six months ended June 30, 2013 and 2012 were as follows:

	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Revenue:
Earned premiums
Excess and Surplus Lines	$	108.7		$	98.5		$	213.8		$	194.7
Commercial Specialty		75.3			81.2			150.5			163.2
International Specialty		36.4			29.4			69.1			57.4
Syndicate 1200		107.4			80.4			198.3			151.5
Run-off Lines		(0.3	)		0.7			0.0			0.7
Total earned premiums		327.5			290.2			631.7			567.5
Net investment income
Excess and Surplus Lines		11.2			13.0			22.1			26.0
Commercial Specialty		6.1			7.0			12.0			13.9
International Specialty		1.7			2.8			4.0			6.9
Syndicate 1200		2.8			3.7			5.6			7.6
Run-off Lines		2.8			3.5			5.6			7.0
Corporate and Other		0.7			0.0			3.9			0.0
Total net investment income		25.3			30.0			53.2			61.4
Fee income, net		0.2			0.5			0.2			1.8
Net realized investment gains (losses)		11.0			(2.7	)		20.5			10.4
Total revenue	$	364.0		$	318.0		$	705.6		$	641.1
	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Income (loss) before income taxes
Excess and Surplus Lines	$	16.7		$	22.3		$	30.6		$	41.2
Commercial Specialty		1.5			(8.8	)		7.2			(9.1	)
International Specialty		2.8			9.6			7.6			15.4
Syndicate 1200		9.8			4.5			18.2			6.2
Run-off Lines		3.7			1.4			3.3			1.0
Total segment income before taxes		34.5			29.0			66.9			54.7
Corporate and Other		(2.7	)		(1.3	)		(7.1	)		(12.0	)
Net realized investment gains (losses)		11.0			(2.7	)		20.5			10.4
Total income before income taxes	$	42.8		$	25.0		$	80.3		$	53.1

The table below presents earned premiums by geographic location for the three and six months ended June 30, 2013 and 2012. For this disclosure, we determine geographic location by the country of domicile of our subsidiaries that write the business and not by the location of insureds or reinsureds from whom the business was generated.

28

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(in millions)	2013		2012		2013		2012
Bermuda	$	22.1	$	28.6	$	47.9	$	50.9
Brazil		10.0		5.2		20.0		11.7
Malta		0.4		0.1		0.8		0.1
United Kingdom		111.3		75.9		198.3		146.2
United States		183.7		180.4		364.7		358.6
Total earned premiums	$	327.5	$	290.2	$	631.7	$	567.5

The following table represents identifiable assets as of June 30, 2013 and December 31, 2012:

(in millions)	June 30, 2013		December 31, 2012
Excess and Surplus Lines	$	2,223.0	$	2,206.7
Commercial Specialty		1,327.6		1,337.7
International Specialty		773.8		731.8
Syndicate 1200		1,667.8		1,811.4
Run-off Lines		521.9		516.5
Corporate and Other		61.2		84.8
Total	$	6,575.3	$	6,688.9

Included in total assets at June 30, 2013 and December 31, 2012 are $364.7 million and $505.7 million, respectively, in assets associated with trade capital providers.

14. Supplemental Cash Flow Information

Income taxes paid. We paid income taxes of $5.0 million and $13.1 million during the three and six months ended June 30, 2013 and 2012, respectively.

Interest paid. Interest paid for the six months ended June 30, was as follows:

	For the Six Months Ended June 30,
(in millions)	2013		2012
Senior unsecured fixed rate notes	$	4.7	$	0.0
Junior subordinated debentures		3.8		9.4
Other indebtedness		0.5		1.6
Revolving credit facility		0.0		0.0
Total interest paid	$	9.0	$	11.0

15. Disclosures about Fair Value of Financial Instruments

Cash. The carrying amount approximates fair value.

Investment securities and short-term investments. See Note 3, “Investments,” for additional information.

Premiums receivable and reinsurance recoverables on paid losses. The carrying value of current receivables approximates fair value. At June 30, 2013 and December 31, 2012, the carrying values of premiums receivable over 90 days were $23.2 million and $24.3 million, respectively. Included in “Reinsurance recoverables” in the

29

Consolidated Balance Sheets at June 30, 2013 and December 31, 2012, are amounts that are due from third party trade capital providers associated with the operations of Argo Underwriting Agency Limited (“Argo International”). Upon settlement, the receivable is offset against the liability also reflected in the accompanying Consolidated Balance Sheets. At June 30, 2013 and December 31, 2012, the payable was in excess of the receivable. Of our paid losses on reinsurance recoverable balances, excluding amounts attributable to Argo International’s third party trade capital providers, at June 30, 2013 and December 31, 2012, the carrying values over 90 days were $17.1 million and $18.0 million, respectively. Our methodology for establishing our allowances for doubtful accounts includes specifically identifying all potential uncollectible balances regardless of aging. Any of the over 90 day balances, where collectability was deemed questionable, have been included in the allowances. At June 30, 2013 and December 31, 2012, the allowance for doubtful accounts for premiums receivable was $3.5 million and $2.5 million, respectively. The allowance for doubtful accounts for reinsurance recoverables on paid losses was $2.3 million and $2.2 million at June 30, 2013 and December 31, 2012, respectively. Premiums receivable over 90 days were secured by collateral in the amount of $0.7 million and $0.4 million at June 30, 2013 and December 31, 2012, respectively. Reinsurance recoverables on paid losses over 90 days were secured by collateral in the amount of $0.3 million at both June 30, 2013 and December 31, 2012.

At June 30, 2013 and December 31, 2012, the fair value of our Junior Subordinated Debentures, Senior unsecured fixed rate notes, and other indebtedness was estimated using appropriate market indices or quoted prices from external sources based on current market conditions.

A summary of our financial instruments whose carrying value did not equal fair value at June 30, 2013 and December 31, 2012 is shown below:

	June 30, 2013				December 31, 2012
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Junior subordinated debentures	$	193.3	$	155.2	$	193.3	$	151.8
Senior unsecured fixed rate notes		143.8		141.2		143.8		143.2
Other indebtedness:
Floating rate loan stock		63.2		50.7		63.0		49.5
Note payable		0.8		0.6		0.8		0.6
	$	401.1	$	347.7	$	400.9	$	345.1

16. Information Provided in Connection with Outstanding Debt of Subsidiaries

In September 2012, through our wholly owned subsidiary Argo Group US, Inc. (“Argo Group US”), we issued $143,750,000 aggregate principal amount of Argo Group US’s 6.5% Senior Notes due September 15, 2042 (the “Notes”). The Notes bear interest at 6.5%, payable quarterly in cash in arrears on the 15th day of March, June, September and December of each year, beginning on December 15, 2012. The Notes are unsecured and unsubordinated obligations of Argo Group US and rank equally in right of payment with all of Argo Group US’s other unsecured and unsubordinated debt. The Notes are guaranteed on a full and unconditional senior unsecured basis by Argo Group. The Notes may be redeemed, for cash, in whole or in part, on or after September 15, 2017, at Argo Group US’s option, at any time and from time to time, prior to maturity at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued but unpaid interest on the principal amount being redeemed to, but not including, the redemption date.

The following tables present condensed consolidating financial information at June 30, 2013 and December 31, 2012 and for the three and six months ended June 30, 2013 and 2012, for Argo Group (the “Parent Guarantor”) and Argo Group US (the “Subsidiary Issuer”). The Subsidiary Issuer is an indirect 100 percent-owned subsidiary of the Parent

30

Guarantor. Investments in subsidiaries are accounted for by the Parent Guarantor under the equity method for purposes of the supplemental consolidating presentation. Earnings of subsidiaries are reflected in the Parent Guarantor’s investment accounts and earnings. The Parent Guarantor fully and unconditionally guarantees certain of the debt of the Subsidiary Issuer. Condensed consolidating financial information of the Subsidiary Issuer is presented on a consolidated basis and consists principally of the net assets, results of operations, and cash flows of operating insurance company subsidiaries.

CONDENSED CONSOLIDATING BALANCE SHEET

June 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US,  Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Assets
Investments	$	(3.8	)	$	2,715.8	$	1,273.4		$	0.0		$	3,985.4
Cash		0.0			83.8		18.2			0.0			102.0
Premiums receivable		0.0			158.4		290.2			0.0			448.6
Reinsurance recoverables		0.0			1,179.3		70.4			0.0			1,249.7
Goodwill and other intangible assets		0.0			138.4		104.1			0.0			242.5
Current income taxes receivable, net		0.0			4.5		4.4			0.0			8.9
Deferred acquisition costs, net		0.0			54.0		57.9			0.0			111.9
Ceded unearned premiums		0.0			92.2		147.5			0.0			239.7
Other assets		5.8			115.2		65.6			0.0			186.6
Due from affiliates		0.0			1.6		(1.6	)		0.0			0.0
Intercompany note receivable		0.0			121.1		(121.1	)		0.0			0.0
Investments in subsidiaries		1,616.4			0.0		0.0			(1,616.4	)		0.0
Total assets	$	1,618.4		$	4,664.3	$	1,909.0		$	(1,616.4	)	$	6,575.3
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0		$	2,209.6		1,024.3		$	0.0		$	3,233.9
Unearned premiums		0.0			422.0		387.7			0.0			809.7
Funds held and ceded reinsurance payable, net		0.0			617.9		(165.2	)		0.0			452.7
Long-term debt		49.0			288.9		63.2			0.0			401.1
Current income taxes payable, net		0.0			0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0			19.4		9.6			0.0			29.0
Accrued underwriting expenses and other liabilities		14.9			92.0		50.9			0.0			157.8
Due to affiliates		(6.1	)		0.0		0.0			6.1			0.0
Intercompany note payable		69.5			0.0		0.0			(69.5	)		0.0
Total liabilities		127.3			3,649.8		1,370.5			(63.4	)		5,084.2
Total shareholders’ equity		1,491.1			1,014.5		538.5			(1,553.0	)		1,491.1
Total liabilities and shareholders’ equity	$	1,618.4		$	4,664.3	$	1,909.0		$	(1,616.4	)	$	6,575.3

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

31

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Assets
Investments	$	(0.9	)	$	2,794.7	$	1,406.9		$	0.0		$	4,200.7
Cash		0.0			73.9		21.9			0.0			95.8
Premiums receivable		0.0			155.1		205.9			0.0			361.0
Reinsurance recoverables		0.0			1,155.1		165.8			0.0			1,320.9
Goodwill and other intangible assets		0.0			139.5		105.8			0.0			245.3
Current income taxes receivable, net		0.0			8.7		4.2			0.0			12.9
Deferred acquisition costs, net		0.0			54.6		44.8			0.0			99.4
Ceded unearned premiums		0.0			85.9		107.7			0.0			193.6
Other assets		4.3			104.0		51.0			0.0			159.3
Due from affiliates		5.0			1.2		(1.2	)		(5.0	)		0.0
Intercompany note receivable		0.0			119.6		(119.6	)		0.0			0.0
Investments in subsidiaries		1,621.1			0.0		0.0			(1,621.1	)		0.0
Total assets	$	1,629.5		$	4,692.3	$	1,993.2		$	(1,626.1	)	$	6,688.9
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0		$	2,226.3	$	997.2		$	0.0		$	3,223.5
Unearned premiums		0.0			415.6		314.6			0.0			730.2
Funds held and ceded reinsurance payable, net		0.0			598.4		47.4			0.0			645.8
Long-term debt		49.0			288.9		63.0			0.0			400.9
Current income taxes payable, net		0.0			0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0			36.8		7.0			0.0			43.8
Accrued underwriting expenses and other liabilities		11.3			84.1		35.2			0.0			130.6
Due to affiliates		0.0			0.0		0.0			0.0			0.0
Intercompany note payable		55.1			0.0		0.0			(55.1	)		0.0
Total liabilities		115.4			3,650.1		1,464.4			(55.1	)		5,174.8
Total shareholders’ equity		1,514.1			1,042.2		528.8			(1,571.0	)		1,514.1
Total liabilities and shareholders’ equity	$	1,629.5		$	4,692.3	$	1,993.2		$	(1,626.1	)	$	6,688.9

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

32

CONDENSED CONSOLIDATING STATEMENT OF INCOME

FOR THE THREE MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	108.3		$	219.2		$	0.0		$	327.5
Net investment income		0.0			19.6			6.0			(0.3	)		25.3
Fee income, net		0.0			(1.0	)		1.2			0.0			0.2
Net realized investment gains		0.0			18.0			(7.0	)		0.0			11.0
Total revenue		0.0			144.9			219.4			(0.3	)		364.0
Expenses:
Losses and loss adjustment expenses		0.0			64.7			128.0			0.0			192.7
Other reinsurance-related expenses		0.0			1.4			3.3			0.0			4.7
Underwriting, acquisition and insurance expenses		6.3			43.5			74.8			0.0			124.6
Interest expense		0.8			3.9			0.7			(0.3	)		5.1
Foreign currency exchange (gain) loss		0.1			0.0			(6.0	)		0.0			(5.9	)
Total expenses		7.2			113.5			200.8			(0.3	)		321.2
(Loss) income before income taxes		(7.2	)		31.4			18.6			0.0			42.8
Provision for income taxes		0.0			8.4			2.7			0.0			11.1
Net (loss) income before equity in earnings of subsidiaries		(7.2	)		23.0			15.9			0.0			31.7
Equity in undistributed earnings of subsidiaries		38.9			0.0			0.0			(38.9	)		0.0
Net income	$	31.7		$	23.0		$	15.9		$	(38.9	)	$	31.7

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF (LOSS) INCOME

FOR THE THREE MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	109.9		$	180.3		$	0.0		$	290.2
Net investment income		0.0			22.3			7.7			0.0			30.0
Fee income, net		0.0			(0.2	)		0.7			0.0			0.5
Net realized investment gains		0.0			(2.1	)		(0.6	)		0.0			(2.7	)
Total revenue		0.0			129.9			188.1			0.0			318.0
Expenses:
Losses and loss adjustment expenses		0.0			74.4			101.4			0.0			175.8
Other reinsurance-related expenses		0.0			0.0			6.9			0.0			6.9
Underwriting, acquisition and insurance expenses		7.6			42.9			64.1			0.0			114.6
Interest expense		1.0			3.8			0.7			0.0			5.5
Foreign currency exchange (gain) loss		0.0			0.3			(10.1	)		0.0			(9.8	)
Total expenses		8.6			121.4			163.0			0.0			293.0
Income (loss) before income taxes		(8.6	)		8.5			25.1			0.0			25.0
Provision for income taxes		0.0			0.9			0.1			0.0			1.0
Net income (loss) before equity in losses of subsidiaries		(8.6	)		7.6			25.0			0.0		$	24.0
Equity in undistributed losses of subsidiaries		32.6			0.0			0.0			(32.6	)		0.0
Net income	$	24.0		$	7.6		$	25.0		$	(32.6	)	$	24.0

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

33

CONDENSED CONSOLIDATING STATEMENT OF INCOME

FOR THE SIX MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	216.0		$	415.7		$	0.0		$	631.7
Net investment income		0.0			40.5			13.3			(0.6	)		53.2
Fee income, net		0.0			(1.3	)		1.5			0.0			0.2
Net realized investment gains		0.0			25.6			(5.1	)		0.0			20.5
Total revenue		0.0			280.8			425.4			(0.6	)		705.6
Expenses:
Losses and loss adjustment expenses		0.0			129.0			234.2			0.0			363.2
Other reinsurance-related expenses		0.0			2.9			6.9			0.0			9.8
Underwriting, acquisition and insurance expenses		12.5			92.2			146.6			0.0			251.3
Interest expense		1.6			7.6			1.4			(0.6	)		10.0
Foreign currency exchange (gain) loss		0.0			0.2			(9.2	)		0.0			(9.0	)
Total expenses		14.1			231.9			379.9			(0.6	)		625.3
(Loss) income before income taxes		(14.1	)		48.9			45.5			0.0			80.3
Provision for income taxes		0.0			11.6			4.3			0.0			15.9
Net (loss) income before equity in earnings of subsidiaries		(14.1	)		37.3			41.2			0.0			64.4
Equity in undistributed earnings of subsidiaries		78.5			0.0			0.0			(78.5	)		0.0
Net income	$	64.4		$	37.3		$	41.2		$	(78.5	)	$	64.4

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF (LOSS) INCOME

FOR THE SIX MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	218.8	$	348.7		$	0.0		$	567.5
Net investment income		0.0			44.2		17.2			0.0			61.4
Fee income, net		0.0			0.0		1.8			0.0			1.8
Net realized investment gains		0.0			7.5		2.9			0.0			10.4
Total revenue		0.0			270.5		370.6			—			641.1
Expenses:
Losses and loss adjustment expenses		0.0			142.9		198.7			0.0			341.6
Other reinsurance-related expenses		0.0			0.0		13.8			0.0			13.8
Underwriting, acquisition and insurance expenses		14.7			86.1		127.5			0.0			228.3
Interest expense		1.9			7.6		1.7			0.0			11.2
Foreign currency exchange (gain) loss		0.0			0.2		(7.1	)		0.0			(6.9	)
Total expenses		16.6			236.8		334.6			0.0			588.0
Income (loss) before income taxes		(16.6	)		33.7		36.0			0.0			53.1
Provision for income taxes		0.0			7.9		1.6			0.0			9.5
Net income (loss) before equity in losses of subsidiaries		(16.6	)		25.8		34.4			0.0		$	43.6
Equity in undistributed losses of subsidiaries		60.2			0.0		0.0			(60.2	)		0.0
Net income	$	43.6		$	25.8	$	34.4		$	(60.2	)	$	43.6

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

34

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE SIX MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Net cash flows from operating activities	$	(7.4	)	$	(3.4	)	$	(85.4	)	$	0.0		$	(96.2	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			433.8			486.1			0.0			919.9
Proceeds from maturities and mandatory calls of investments		0.0			160.9			50.0			0.0			210.9
Purchases of investments		0.0			(538.6	)		(387.7	)		0.0			(926.3	)
Change in short-term investments and foreign regulatory deposits		0.0			(12.8	)		(35.7	)		0.0			(48.5	)
Settlements of foreign currency exchange forward contracts		(0.1	)		0.0			(2.6	)		0.0			(2.7	)
Issuance of intercompany note, net		0.0			0.0			(14.0	)		14.0			0.0
Other, net		(0.1	)		0.9			(14.2	)		0.0			(13.4	)
Cash provided (used) by investing activities		(0.2	)		44.2			81.9			14.0			139.9
Cash flows from financing activities:
Borrowings under intercompany note, net		14.0			0.0			0.0			(14.0	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		0.0			0.0			0.0			0.0			0.0
Activity under stock incentive plans		1.4			0.0			0.1			0.0			1.5
Repurchase of Company’s common shares		0.0			(30.9	)		0.0			0.0			(30.9	)
Excess tax expense from share-based payment arrangements		0.0			0.0			0.0			0.0			0.0
Payment of cash dividend to common shareholders		(7.8	)		0.0			0.0			0.0			(7.8	)
Cash provided (used) by financing activities		7.6			(30.9	)		0.1			(14.0	)		(37.2	)
Effect of exchange rate changes on cash		0.0			0.0			(0.3	)		0.0			(0.3	)
Change in cash		0.0			9.9			(3.7	)		0.0			6.2
Cash, beginning of period		0.0			73.9			21.9			0.0			95.8
Cash, end of period	$	0.0		$	83.8		$	18.2		$	0.0		$	102.0

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE SIX MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Net cash flows from operating activities	$	(15.3	)	$	(26.8	)	$	13.7		$	0.0		$	(28.4	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			391.2			344.4			0.0			735.6
Proceeds from maturities and mandatory calls of investments		0.0			126.8			79.1			0.0			205.9
Purchases of investments		0.0			(503.3	)		(363.3	)		0.0			(866.6	)
Change in short-term investments and foreign regulatory deposits		(0.1	)		43.9			(60.0	)		0.0			(16.2	)
Settlements of foreign currency exchange forward contracts		2.4			0.0			(3.2	)		0.0			(0.8	)
Issuance of intercompany note, net		0.0			(10.0	)		(9.1	)		19.1			0.0
Other, net		0.0			(15.3	)		(4.2	)		0.0			(19.5	)
Cash provided (used) by investing activities		2.3			33.3			(16.3	)		19.1			38.4
Cash flows from financing activities:
Borrowings under intercompany note, net		19.1			0.0			0.0			(19.1	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		0.0			0.0			0.0			0.0			0.0
Activity under stock incentive plans		0.2			0.0			0.0			0.0			0.2
Repurchase of Company’s common shares		0.0			(27.8	)		0.0			0.0			(27.8	)
Excess tax expense from share-based payment arrangements		0.0			0.0			0.0			0.0			0.0
Payment of cash dividend to common shareholders		(6.3	)		0.0			0.1			0.0			(6.2	)
Cash (used) provided by financing activities		13.0			(27.8	)		0.1			(19.1	)		(33.8	)
Effect of exchange rate changes on cash		0.0			0.0			(1.3	)		0.0			(1.3	)
Change in cash		0.0			(21.3	)		(3.8	)		0.0			(25.1	)
Cash, beginning of period		0.0			85.1			15.8			0.0			100.9
Cash, end of period	$	0.0		$	63.8		$	12.0		$	0.0		$	75.8

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

35

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following is a discussion and analysis of our results of operations for the three and six months ended June 30, 2013 compared with the three and six months ended June 30, 2012, and also a discussion of our financial condition as of June 30, 2013. This discussion and analysis should be read in conjunction with the attached unaudited interim Consolidated Financial Statements and notes thereto and Argo Group’s Annual Report on Form 10-K for the year ended December 31, 2012 filed with the Securities and Exchange Commission on February 28, 2013, including the audited Consolidated Financial Statements and notes thereto.

Forward Looking Statements

Management’s Discussion and Analysis of Financial Condition and Results of Operations, Quantitative and Qualitative Disclosures About Market Risk and the accompanying Consolidated Financial Statements (including the notes thereto) may contain “forward looking statements,” which are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. The forward looking statements are based on our current expectations and beliefs concerning future developments and their potential effects on us. There can be no assurance that actual developments will be those anticipated by us. Actual results may differ materially as a result of significant risks and uncertainties, including non-receipt of expected payments, the capital markets and their effect on investment income and the fair value of the investment portfolio, development of claims and the effect on loss reserves, accuracy in estimating loss reserves, changes in the demand for our products, the effect of general economic conditions, adverse state and federal legislation and regulations, government investigations into industry practices, developments relating to existing agreements, heightened competition, changes in pricing environments and changes in asset valuations. For a more detailed discussion of risks and uncertainties, see our public filings made with the Securities and Exchange Commission. We undertake no obligation to publicly update any forward-looking statements.

Generally, it is our policy to communicate events that may have a material adverse impact on our operations or financial position, including property and casualty catastrophic events and material losses in the investment portfolio, in a timely manner through a public announcement. It is also our policy not to make public announcements regarding events that are believed to have no material adverse impact on our results of operations or financial position based on management’s current estimates and available information, other than through regularly scheduled calls, press releases or filings.

Results of Operations

The following is a comparison of selected data from our operations:

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Gross written premiums	$	542.2		$	474.2		$	980.4		$	870.5
Earned premiums	$	327.5		$	290.2		$	631.7		$	567.5
Net investment income		25.3			30.0			53.2			61.4
Fee income, net		0.2			0.5			0.2			1.8
Net realized investment and other gains		11.0			(2.7	)		20.5			10.4
Total revenue	$	364.0		$	318.0		$	705.6		$	641.1
Income before income taxes	$	42.8		$	25.0		$	80.3		$	53.1
Provision for income taxes		11.1			1.0			15.9			9.5
Net income	$	31.7		$	24.0		$	64.4		$	43.6
Loss ratio		59.7	%		62.1	%		58.4	%		61.7	%
Expense ratio		38.6	%		40.4	%		40.4	%		41.2	%
Combined ratio		98.3	%		102.5	%		98.8	%		102.9	%

36

The increase in consolidated gross written and earned premiums was primarily attributable to growth in our segments, excluding Commercial Specialty, resulting from our introduction of new products, increased renewals and moderate rate increases. Partially offsetting these increases were declines in gross written and earned premiums in the Commercial Specialty segment due to the planned reductions in select lines.

The decline in consolidated net investment income was primarily attributable to a reduction in invested asset balances due to the transfer of certain invested assets as a result of a whole account quota share contract for our Syndicate 1200 segment, which was effective in December 2012, the continued decline in portfolio yield and a modest repositioning of the portfolio away from long durations assets and investments with higher yields.

The increase in consolidated net realized investment gains for the three and six months ended June 30, 2013 was primarily attributable to the recognition of gains of certain fixed maturity and equity securities due to repositioning of the investment portfolio coupled with the increase in value of investments accounted for under the equity method of accounting. Net realized gains from the sales of equity investments were $6.5 million and $7.0 million for the three and six months ended June, 2013. Net realized gains from the sales of fixed maturity securities were $8.3 million and $13.3 million for the three and six months ended June 30, 2013. Other investments reported a realized loss of $3.3 million for the three months ended June 30, 2013, primarily attributable to foreign currency impact on our Fund’s at Lloyd’s investments and our foreign currency future forward contracts. For the six months ended June 30, 2013, other investments reported a realized gain of $5.5 million. Offsetting these realized gains were the recognition of $0.4 million and $5.2 million for the three and six months ended June 30, 2013, respectively, in other-than-temporary impairments on our equity and strategic investment portfolios.

We have purchased foreign currency future forward contracts to manage currency exposure on losses related to the New Zealand and Japan earthquakes and Australian floods. The open contracts have a term of 90 days to match the anticipated payment pattern of the associated losses, and may be renewed at the end of each term. We do not apply hedge accounting to these contracts; as a result, all gains (losses) were recognized in net realized investment gains (losses). For the three months ended June 30, 2013 we recognized $2.9 million in foreign currency exchange gains related to the loss reserves recorded for these events which were offset by $3.9 million in realized losses from the currency forward contracts. For the six months ended June 30, 2013, we recognized foreign currency exchange gains of $3.3 million related to the loss reserves recorded for these events which were offset by $4.6 million in realized losses from the currency forward contracts. The foreign currency exchange (gains) losses related to these loss reserves and the realized gains (losses) from the currency forward contracts are reported under the Corporate and Other segment.

Consolidated losses and loss adjustment expenses were $192.7 million and $175.8 million for the three months ended June 30, 2013 and 2012, respectively. Included in losses and loss adjustment expenses for the three months ended June 30, 2013 were current accident year large losses of $9.3 million. Also included in losses and loss adjustment expense for the three months ended June 30, 2013 was $10.5 million in catastrophe losses resulting from the European floods and storm activity in the United States. Offsetting these current accident year losses was $12.8 million of net favorable development on prior accident year loss reserves, primarily attributable to favorable development in the general liability and property lines partially offset by unfavorable development in the commercial automobile and reinsurance lines. Included in losses and loss adjustment expense for the three months ended June 30, 2012 was $3.9 million in catastrophe losses resulting from various United States storms. Additionally, included in losses and loss adjustment expense for the three months ended June 30, 2012 was $4.1 million in net favorable development on prior accident year loss reserves primarily attributable to favorable development in the general liability, property and reinsurance lines, partially offset by unfavorable development in the commercial multi peril and commercial automobile lines.

Consolidated losses and loss adjustment expenses were $363.2 million and $341.6 million for the six months ended June 30, 2013 and 2012, respectively. Included in losses and loss adjustment expense for the six months ended June 30, 2013 was $12.4 million in catastrophe losses compared to $8.1 million in catastrophe losses for the same period ended 2012. Included in losses and loss adjustment expenses for the six months ended June 30, 2013 was $17.3

37

million in net favorable loss reserve development on prior accident years compared to $7.4 million in net favorable loss reserve development on prior accident years for the same period in 2012. The following table summarizes the reserve development as respects to prior year loss reserves by line of business for the six months ended June 30, 2013:

(in millions)	2012 Net Reserves		Net Reserve  Development (Favorable)/Unfavorable			Percent of 2012 Net Reserves
General liability	$	919.9	$	(17.0	)		-1.8	%
Workers compensation		365.3		(0.3	)		-0.1	%
Commercial multi-peril		195.2		(0.5	)		-0.3	%
Commercial auto liability		165.1		6.0			3.6	%
Reinsurance - nonproportional assumed property		122.9		2.7			2.2	%
Special property		21.6		(1.4	)		-6.5	%
Syndicate 1200 property		140.1		(4.0	)		-2.9	%
Syndicate 1200 liability		122.5		0.4			0.3	%
All other lines		58.3		(3.2	)		-5.5	%
Total	$	2,110.9	$	(17.3	)		-0.8	%

In determining appropriate reserve levels at June 30, 2013, we maintained the same general processes and disciplines that were used to set reserves at prior reporting dates. No significant changes in methodologies were made to estimate the reserves since the last reporting date; however, at each reporting date we reassess the actuarial estimate of the reserve for loss and loss adjustment expenses and record our best estimate. Consistent with prior reserve valuations, as claims data becomes more mature for prior accident years, actuarial estimates were refined to weigh certain actuarial methods more heavily in order to respond to any emerging trends in the paid and reported loss data. These modifications to the analysis varied depending on whether the line of business was short-tailed or long-tailed and also varied by accident year. While prior accident years’ net reserves for losses and loss adjustment expenses for some lines of business have developed favorably in recent years, this does not infer that more recent accident years’ reserves also will develop favorably; pricing, reinsurance costs, the legal environment, general economic conditions including changes in inflation and many other factors impact management’s ultimate loss estimates.

When determining reserve levels, we recognize that there are several factors that present challenges and uncertainties to the estimation of loss reserves. Examples of these uncertainties include changes to the reinsurance structure and potential increases in inflation. Our net retained losses vary by product and these retentions have generally increased over time. To properly recognize these uncertainties, actuarial reviews have given significant consideration to the paid and incurred Bornhuetter-Ferguson (“BF”) methodologies. Compared with other actuarial methodologies, the paid and incurred BF methods assign smaller weight to actual reported loss experience, with the greatest weight assigned to an expected or planned loss ratio. The expected or planned loss ratio has typically been determined using various assumptions pertaining to prospective loss frequency and loss severity. In setting reserves at June 30, 2013, we continued to consider the paid and incurred BF methods for recent years.

Our loss reserve estimates gradually blend in the results from development and frequency/severity methodologies over time. For general liability estimates, more credibility is assigned to our own loss experience approximately 60 to 72 months after the beginning of an accident year. For property business, our loss reserve estimates also blend in the results from development and frequency/severity methodologies over time. For property lines, in contrast to general liability estimates, full credibility is assigned to our loss experience approximately 18 to 36 months after the beginning of an accident year, where loss reporting and claims closing patterns settle more quickly. Our loss experience receives partial weighting in the estimates 12 to 24 months after the beginning of the accident year.

Consolidated loss reserves were $3,233.9 million (including $129.9 million of reserves attributable to Syndicate 1200 segment’s trade capital providers), and $3,223.1 million (including $173.2 million of reserves attributable to Syndicate 1200 segment’s trade capital providers) as of June 30, 2013 and 2012, respectively. Management has recorded its best estimate of loss reserves as of June 30, 2013 based on current known facts and circumstances. Due to the significant uncertainties inherent in the estimation of loss reserves, there can be no assurance that future loss development, favorable or unfavorable, will not occur.

38

In 2011, we entered into two reinsurance transactions with a special purpose reinsurance company which provided coverage through the issuance of two catastrophe bond transactions. The reinsurance transactions provide coverage for selected events. The initial catastrophe bond cover expired on December 31, 2012. In accordance with generally accepted accounting principles in the United States, we are accounting for these covers as derivatives, and as such, present the financial statement impact in a separate line item – “Other reinsurance-related expenses” - in the Consolidated Statements of Income. Other reinsurance-related expenses totaled $4.7 million and $9.8 million for the three and six months ended June 30, 2013, compared to $6.9 million and $13.8 million for the three and six months ended June 30, 2012. As management views these coverages as reinsurance protection, we treat the financial statement effects of these covers as ceded premium for the purposes of calculating our loss, expense and combined ratios.

Consolidated underwriting, insurance and acquisition expenses were $124.6 million and $251.3 million for the three and six months ended June 30, 2013, respectively, compared to $114.6 million and $228.3 million for the same period in 2012. The increase in the dollar value of the expense was primarily attributable to increased acquisition costs due to the growth in premiums, coupled with increases in equity compensation expenses due to the impact of the increase in our stock price on our cash-settled stock appreciation rights. The decline in the expense ratio for the period in 2013 as compared to 2012 was attributable to the increase premium volumes without a corresponding increase in fixed costs.

Consolidated interest expense was $5.1 million and $10.0 million for the three and six months ended June 30, 2013 compared to $5.5 million and $11.2 million for the same periods in 2012. The decline in consolidated interest expense was the result of redemption in November 2012 of two fixed-rate junior subordinated debentures with the proceeds of the senior fixed rate notes, which bear a lower interest rate.

Consolidated foreign currency exchange gains for the three and six months ended June 30, 2013 were $5.9 million and $9.0 million, respectively, compared to $9.8 million and $6.9 million for the same periods ended 2012. The changes in the foreign currency exchange gains were due to fluctuations of the U.S Dollar, on a weighted average basis, against the currencies in which we transact our business.

The consolidated income tax provision represents the income tax expense associated with our operations based on the tax laws of the jurisdictions in which they operate. Therefore, the consolidated provision for income taxes represents taxes on net income for our United States, United Kingdom, Belgium, Brazil, Ireland and Switzerland operations. The consolidated provision for income taxes was $11.1 million for the three months ended June 30, 2013 compared to $1.0 million consolidated income tax provision for the same period ended 2012. For the three months ended June 30, 2013 our operations in the United States and the United Kingdom generated higher taxable income as compared to 2012, resulting in a higher effective tax rate. Additionally for the three months ended June 30, 2013, our Bermuda operations, which are not subject to income taxes, reported lower net income compared to same period ended 2012. The consolidated provision for income taxes was $15.9 million and $9.5 million for the six months ended June 30, 2013 and 2012, respectively. The increased effective tax rate for 2013 as compared to 2012 was primarily attributable to higher taxable income in the United Kingdom.

Segment Results

We are primarily engaged in writing property and casualty insurance and reinsurance. We have four ongoing reporting segments: Excess and Surplus Lines, Commercial Specialty, International Specialty and Syndicate 1200. Additionally, we have a Run-off Lines segment for products that we no longer underwrite.

In evaluating the operating performance of our segments, we focus on core underwriting and investing results before consideration of realized gains or losses from the sales of investments. Management excludes realized investment gains and losses from segment results, as decisions regarding the sales of investments are made at the corporate level. Although this measure of profit (loss) does not replace net income (loss) computed in accordance with GAAP as a measure of profitability, management uses this measure of profit (loss) to focus its reporting segments on generating operating income.

39

Since we generally manage and monitor the investment portfolio and indebtedness on an aggregate basis, the related net investment income and interest expense, are discussed above on a consolidated basis under consolidated net investment income and consolidated interest expense rather than within or by segment. We allocate net investment income and interest expense to each segment based on their allocated capital and reserves, while taking into consideration the anticipated duration of these reserves.

Excess and Surplus Lines. The following table summarizes the results of operations for the Excess and Surplus Lines segment for the three and six months ended June 30, 2013 and 2012:

	Three Months Ended June  30,						Six Months Ended June  30,
(in millions)	2013			2012			2013			2012
Gross written premiums	$	175.8		$	143.9		$	303.4		$	251.2
Earned premiums	$	108.7		$	98.5		$	213.8		$	194.7
Losses and loss adjustment expenses		62.5			52.6			121.1			104.8
Other reinsurance-related expenses		1.3			0.0			2.5			0.0
Underwriting, acquisition and insurance expenses		37.6			34.6			78.3			70.4
Underwriting income		7.3			11.3			11.9			19.5
Net investment income		11.2			13.0			22.1			26.0
Interest expense		(1.8	)		(2.0	)		(3.4	)		(4.3	)
Income before income taxes	$	16.7		$	22.3		$	30.6		$	41.2
Loss ratio		58.1	%		53.4	%		57.3	%		53.8	%
Expense ratio		35.1	%		35.2	%		37.1	%		36.2	%
Combined ratio		93.2	%		88.6	%		94.4	%		90.0	%

The increase in gross written and earned premiums for the three and six months ended June 30, 2013 as compared to the same periods in 2012 was primarily attributable to increased underwriting and rate increases in virtually all lines. The Excess and Surplus Lines segment has introduced several new products during 2012 and into 2013 to focus on future growth and profitability.

The increase in the loss ratio for the three months ended June 30, 2013 as compared to the same period ended 2012 was primarily attributable to increased catastrophe losses and lower net favorable development on prior accident year reserves. Catastrophe losses for the three months ended June 30, 2013 and 2012 were $2.6 million and $2.1 million, respectively, resulting from storms in the United States. Included in losses and loss adjustment expenses for the three months ended June 30, 2013 was $9.2 million in net favorable development on prior accident year loss reserves consisting of $10.7 million of favorable development in the general and product liability lines, partially offset by $0.8 million of unfavorable development in the commercial auto lines and $0.8 million in unfavorable development in the property lines. Included in losses and loss adjustment expenses for the three months ended June 30, 2012 was $12.4 million in net favorable development on prior accident year loss reserves consisting of $11.4 million of favorable development in the general and products liability lines, primarily in accident year 2009, and $1.3 million of favorable development in property lines, primarily in accident year 2010. This was partially offset by unfavorable development of $0.5 million in auto liability, primarily in accident years 2010 and 2011.

Catastrophe losses for the six months ended June 30, 2013 and 2012 were $3.4 million and $2.2 million, respectively, resulting from storms in the United States. Included in losses and loss adjustment expenses for the six months ended June 30, 2013 was $14.4 million in net favorable development on prior accident year loss reserves consisting of $19.9 million of favorable development in the general and product liability lines, partially offset by $4.7 million of unfavorable development in the commercial auto lines and $0.9 million in unfavorable development in the property

40

lines. Included in losses and loss adjustment expenses for the six months ended June 30, 2012 was $21.7 million in favorable development in prior accident year loss reserves consisting of $18.1 million of favorable development in the general and products liability lines of business primarily in accident year 2009, $2.0 million of favorable development in the property lines, primarily in accident year 2010, and $1.4 million of favorable development in the automobile liability lines of business, primarily in accident year 2009. Loss reserves were $1,200.5 million and $1,260.3 million at June 30, 2013 and 2012, respectively.

The decline in the expense ratio for the three months ended June 30, 2013 as compared to the same period in 2012 was primarily attributable to increased premium volumes. The increase in the expense ratio for the six months ended June 30, 2013 as compared to the same period in 2012 was primarily attributable to increased equity compensation expense due to the increase in our stock price.

Commercial Specialty. The following table summarizes the results of operations for the Commercial Specialty segment for the three and six months ended June 30, 2013 and 2012:

	Three Months Ended June  30,						Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Gross written premiums	$	85.6		$	92.7		$	191.7		$	200.4
Earned premiums	$	75.3		$	81.2		$	150.5		$	163.2
Losses and loss adjustment expenses		50.9			67.1			98.4			126.4
Other reinsurance-related expenses		0.1			0.0			0.4			0.0
Underwriting, acquisition and insurance expenses		27.1			28.3			53.5			57.0
Underwriting income (loss)		(2.8	)		(14.2	)		(1.8	)		(20.2	)
Net investment income		6.1			7.0			12.0			13.9
Interest expense		(0.9	)		(1.4	)		(1.8	)		(2.8	)
Fee income, net		(0.9	)		(0.2	)		(1.2	)		0.0
Income (loss) before income taxes	$	1.5		$	(8.8	)	$	7.2		$	(9.1	)
Loss ratio		67.6	%		82.6	%		65.5	%		77.5	%
Expense ratio		36.2	%		34.8	%		35.7	%		34.9	%
Combined ratio		103.8	%		117.4	%		101.2	%		112.4	%

The decline in gross written and earned premiums for the three and six months ended June 30, 2013 as compared to the same periods ended 2012 was primarily due to reduced underwriting in our retail business and public entity units due to planned reductions as we exited unprofitable accounts and implemented underwriting initiatives, partially offset by increasing rates. Partially offsetting these declines was increased gross written premiums in our surety business, as this business unit continues to expand.

The decline in the loss ratio for the three months ended June 30, 2013 as compared to the same period in 2012 was attributable to net favorable development on prior accident year reserves during 2013 versus net unfavorable development in 2012, partially offset by an increase in the current accident year loss ratio. Catastrophe losses for the three months ended June 30, 2013 and 2012 were $1.6 million and $1.8 million, respectively, resulting from storms in the United States. Included in losses and loss adjustment expense for the three months ended June 30, 2013 was $4.9 million related to large losses in our commercial programs and public entity businesses. Partially offsetting these 2013 accident year losses was $1.0 million in net favorable development on prior accident year loss reserves. The net favorable development was primarily attributable to $5.2 million in favorable development in short tail lines, $2.0 million favorable development in workers compensation lines and $0.8 million favorable development in an assumed directors’ and officers’ program. Partially offsetting this favorable development was $4.8 million unfavorable development in general liability due to increased claim severity and $2.3 million unfavorable development in auto liability. Included in losses and loss adjustment expenses for the three months ended June 30, 2012 was $13.4 million in net unfavorable development on prior accident year loss reserves primarily attributable to $13.2 million

41

unfavorable development in general liability lines due to increased claim severity and $1.9 million unfavorable development in auto liability, partially offset by $1.5 million favorable development in workers compensation and $0.2 million favorable development in short tail lines.

Catastrophe losses for the six months ended June 30, 2013 and 2012 were $2.7 million and $4.2 million, respectively, resulting from storms in the United States. Included in the loss ratio for the six months ended June 30, 2013 was $0.1 million in net unfavorable development on prior accident year loss reserves. The unfavorable development was primarily attributable to $7.0 million unfavorable development in general liability lines due to increased claim severity and $2.1 million unfavorable development in auto liability, partially offset by $5.9 million in favorable development in short tail lines, $2.1 million favorable development in workers compensation lines and $0.8 million favorable development in an assumed directors’ and officers’ program. Included in the loss ratio for the six months ended June 30, 2012 was $18.0 million in net unfavorable development on prior accident year loss reserves. The unfavorable development was primarily attributable to $22.6 million unfavorable development in general liability lines due to increased claim severity and $2.9 million unfavorable development in auto liability, partially offset by $6.0 million favorable development in workers compensation and $1.5 million favorable development in short tail lines. Loss reserves were $679.9 million and $628.8 million at June 30, 2013 and 2012, respectively.

The decline in the dollar value of underwriting, acquisition and insurance expense was primarily attributable to decreased acquisition costs due to the decline in premiums. The increase in the expense ratios was primarily attributable to increased expense associated with the equity compensation awards, partially offset by increased ceding commissions.

International Specialty: The following table summarizes the results of operations for the International Specialty segment for the three and six months ended June 30, 2013 and 2012:

	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Gross written premiums	$	96.1		$	84.3		$	174.3		$	141.9
Earned premiums	$	36.4		$	29.4		$	69.1		$	57.4
Losses and loss adjustment expenses		20.8			9.7			36.4			22.9
Other reinsurance-related expenses		1.6			2.4			3.1			4.7
Underwriting, acquisition and insurance expenses		12.1			9.5			24.4			19.3
Underwriting income		1.9			7.8			5.2			10.5
Net investment income		1.7			2.8			4.0			6.9
Interest expense		(0.8	)		(1.0	)		(1.6	)		(2.0	)
Income before income taxes	$	2.8		$	9.6		$	7.6		$	15.4
Loss ratio		59.7	%		36.0	%		55.2	%		43.5	%
Expense ratio		34.6	%		35.1	%		36.9	%		36.6	%
Combined ratio		94.3	%		71.1	%		92.1	%		80.1	%

Gross written and earned premiums increased for the three and six months ended June 30, 2013 primarily as a result growth in all business units. Earned premiums for our short tail lines were $20.4 million and $37.4 million for the three and six months ended June 30, 2013, respectively, compared to $18.7 million and $35.7 million for the same periods in 2012. The excess casualty and professional lines business contributed earned premiums of $4.9 million and $9.6 million for the three and six months ended June 30, 2013 compared with $4.2 million and $8.5 million for the same periods in 2012. Earned premium for the business unit in Brazil was $10.0 million and $20.0 million for the three and six months ended June 30, 2013 compared with $5.2 million and $11.7 million for the same periods in 2012.

42

The increase in the loss ratio for the three months ended June 30, 2013 as compared to the same period in 2012 was due to increased catastrophe losses and lower favorable development on prior accident year loss reserves, partially offset by a decrease in the current accident year loss ratio driven by short tail lines. Included in losses and loss adjustment expenses for the three months ended June 30, 2013 was $6.3 million of catastrophe losses, including $4.6 million from the European floods and $1.7 million from storm activity in the United States. Losses and loss adjustment expense for the three months ended June 30, 2012 reflected no catastrophe losses. Included in losses and loss adjustment expenses for the three months ended June 30, 2013 was $0.3 in net favorable development on prior accident year loss reserves primarily attributable to $1.8 million of favorable development on professional lines due to favorable loss activity and $1.2 million in favorable development on assumed contracts from older years, partially offset by $2.4 million unfavorable development in short tail lines including losses for a marine industry loss warranty and $0.3 million in unfavorable development for our Brazil unit. Included in losses and loss adjustment expenses for the three months ended June 30, 2012 was $3.4 million in net favorable development on prior accident year loss reserves, primarily attributable to the non-catastrophe property reinsurance losses developing favorably.

Included in loss and loss adjustment expenses for the six month ended June 30, 2013 was $6.3 million in catastrophe losses resulting from European floods and storm activity in the United States, compared to catastrophe losses of $1.7 million for the same period ended 2012. Included in losses and loss adjustment expenses for the six month ended June 30, 2013 was $0.6 million in net unfavorable development on prior accident year loss reserves primarily attributable to $3.7 million in unfavorable development on the short tail lines including a marine industry loss warranty and crop losses and $0.4 million in unfavorable development in our Brazil unit, partially offset by $2.3 million of favorable development on professional lines due to favorable loss activity and $1.2 million on assumed contract from older years. Included in losses and loss adjustment expenses for the six month ended June 30, 2012 was $3.6 million in net unfavorable development on prior accident year loss reserves primarily attributable to the non-catastrophe property reinsurance losses developing favorably. Loss reserves for the International Specialty segment were $274.9 million and $244.6 million at June 30, 2013 and 2012, respectively.

The decline in the expense ratio for the three months ended June 30, 2013 as compared to the same period in 2012 was primarily attributable to increased premium volumes in our Brazil operations. The increase in the expense ratio for the six months ended June 30, 2013 as compared to the same periods in 2012 was primarily attributable to increased equity compensation expense due to the increase in our stock price, partially offset by increased premium volumes in our Brazil operations.

Syndicate 1200: The following table summarizes the results of operations for the Syndicate 1200 segment for the three and six months ended June 30, 2013 and 2012:

	Three Months Ended June  30,						Six Months Ended June  30,
(in millions)	2013			2012			2013			2012
Gross written premiums	$	184.9		$	153.2		$	311.0		$	276.3
Earned premiums	$	107.4		$	80.4		$	198.3		$	151.5
Losses and loss adjustment expenses		59.5			46.2			107.3			85.3
Other reinsurance-related expenses		1.8			1.8			3.4			3.7
Underwriting, acquisition and insurance expenses		39.2			31.5			74.7			64.0
Underwriting income (loss)		6.9			0.9			12.9			(1.5	)
Net investment income		2.8			3.7			5.6			7.6
Interest expense		(1.0	)		(0.8	)		(1.7	)		(1.7	)
Fee income, net		1.1			0.7			1.4			1.8
Income before income taxes	$	9.8		$	4.5		$	18.2		$	6.2
Loss ratio		56.4	%		58.7	%		55.1	%		57.7	%
Expense ratio		37.0	%		40.2	%		38.3	%		43.3	%
Combined ratio		93.4	%		98.9	%		93.4	%		101.0	%

43

For 2013, we have maintained our participation in Syndicate 1200 at 79%. For the three and six months ended June 30, 2013, the property division wrote $94.9 million and $151.4 million of gross written premiums, respectively, compared to $70.2 million and $135.3 million for the same period ended 2012. The increase in the property book was primarily attributable to increased underwriting in the real estate owned, North American and International binders and personal accident lines. For the three and six months ended June 30, 2013, the casualty division recorded gross written premiums of $54.2 million and $103.9 million, respectively, compared to $39.6 million and $84.9 million for the same periods in 2012. Gross written premiums increased in 2013 due to increasing our exposure in general liability, medical malpractice and professional indemnity business offset by a reduction of international casualty treaty business. The specialty division recorded gross written premiums of $28.5 million and $40.6 million, respectively, down from $36.0 million and $44.4 million for the same periods in 2012. The decline in the gross written premiums was primarily due to the exiting of the energy lines due to declining rates. The aerospace division recorded gross written premiums of $7.4 million and $15.2 million, respectively, compared to $7.3 million and $11.7 million for the same periods in 2012. The increase in earned premiums in 2013 as compared to 2012 was primarily attributable to the increase in gross written premiums discussed above.

Losses and loss adjustment expenses are reported net of losses ceded to the trade capital providers. The Syndicate 1200 segment reported no catastrophe losses for the three and six months ended June 30, 2013 and 2012. Included in losses and loss adjustment expense for the three months ended June 30, 2013 were current accident year losses of $4.4 million resulting from two onshore energy losses. Included in losses and loss adjustment expenses for the three months ended June 30, 2013 was $1.3 million favorable development driven by favorable development in property facultative, international property treaty and space business. Partially offsetting this was unfavorable development in the onshore energy, general liability and North American binder classes of business due to poorer than expected claims experience. Included in losses and loss adjustment expenses for the six months ended June 30, 2013 was $3.5 million favorable development driven by favorable development in property facultative, international property treaty, North American binders and space business. Partially offsetting this was unfavorable development in the onshore energy and general liability classes of business due to poorer than expected claims experience. Included in losses and loss adjustment expense for the three and six months ended June 30, 2012 was $1.9 million and $2.3 million, respectively, in net favorable development on prior accident year loss reserves. The net favorable prior year development was primarily attributable to an improvement in the North America binder class as the benefit of re-underwriting the portfolio continues to come through and improvement in the property facultative class of business as a claim relating to Hurricane Ike was settled for less than case reserves. This favorable development was partially offset by unfavorable development in the professional indemnity class of business driven by an increase in prior year premiums as a result of re-estimation of premium income written through binding authorities.

Loss reserves as of June 30, 2013 were $744.4 million which includes $129.9 million attributable to trade reinsurers, compared to $715.5 million which includes $173.2 million of reserves attributable to the trade capital providers as of June 30, 2012.

The decrease in the expense ratio for the three and six months ended June 2013 as compared to the same periods in 2012 was primarily attributable to changing business mix, scale and a drive internally to reduce brokerage rates and other expenses.

Run-off Lines. We have discontinued underwriting certain lines of business primarily workers compensation formerly referred to as RM (“Risk Management”). Also included in the Run-off Lines segment are liabilities associated with other liability policies written in the 1970s and into the 1980s, and include asbestos and environmental liabilities as well as medical malpractice liabilities. As we no longer actively underwrite business within these programs, all current activity is related to the management of claims and other administrative functions.

The following table summarizes the results of operations for the Run-off Lines segment:

44

	Three Months Ended June  30,						Six Months Ended June  30,
(in millions)	2013			2012			2013			2012
Earned premiums	$	(0.3	)	$	0.7		$	0.0		$	0.7
Losses and loss adjustment expenses		(1.0	)		0.2			0.0			2.2
Underwriting, acquisition and insurance expenses		(0.7	)		1.9			1.4			3.1
Underwriting income (loss)		1.4			(1.4	)		(1.4	)		(4.6	)
Net investment income		2.8			3.5			5.6			7.0
Interest expense		(0.5	)		(0.7	)		(0.9	)		(1.4	)
Income before income taxes	$	3.7		$	1.4		$	3.3		$	1.0

Earned premiums for the Run-off Lines segment are due to adjustments resulting from final audits, reinstatement premiums and other adjustments on policies previously written.

Losses and loss adjustment expenses for the three months ended June 30, 2013 included $1.0 million favorable development on prior accident year loss reserves primarily attributable to $1.3 million favorable development related to the 2005 hurricanes, partially offset by $0.3 million of unfavorable development related to the unwinding of the workers compensation reserve discount. Included in losses and loss adjustment expense for the three months ended June 30, 2012 was $0.2 million in unfavorable development on prior accident year loss reserves due to the unwinding of the workers compensation reserve discount. Losses and loss adjustment expenses for the six months ended June 30, 2013 included $0.1 million favorable development on prior accident year loss reserves attributable to $1.4 million in favorable development related to the 2005 hurricanes largely offset by unfavorable development resulting from commutations and the unwinding of the workers compensation reserve discount. Included in losses and loss adjustment expense for the six months ended June 30, 2012 was $2.2 million in net unfavorable development on prior accident years loss reserves driven by $2.0 million of unfavorable development related to risk management run-off reserves due to strengthening the reserve for unallocated loss adjustment expenses and $0.5 million of unfavorable development related to the unwinding of the workers compensation reserve discount, partially offset by $0.3 million of favorable development in the involuntary lines. Loss reserves for the Run-off Lines were as follows:

	Six Months Ended June 30,
(in millions)	2013						2012
	Gross			Net			Gross			Net
Asbestos and environmental:
Loss reserves, beginning of the year	$	64.6		$	58.9		$	75.3		$	68.2
Incurred losses		0.7			0.7			0.0			0.0
Losses paid		(6.9	)		(6.2	)		(7.5	)		(6.7	)
Loss reserves - asbestos and environmental, end of the period		58.4			53.4			67.8			61.5
Risk management reserves		258.6			179.8			283.2			198.0
Run-off reinsurance reserves		11.9			11.9			16.3			16.2
Other run-off lines		5.3			4.7			6.6			6.2
Total loss reserves - Run-off Lines	$	334.2		$	249.8		$	373.9		$	281.9

Underwriting, acquisition and insurance expenses for the Run-off segment consists primarily of administrative expenses. Included in underwriting expense for the three and six months ended June 30, 2012 was a $2.6 million settlement which represents the recoupment of excess workers compensation assessments.

Liquidity and Capital Resources

Our principal operating cash flow sources are premiums and investment income. The primary operating cash uses are claim payments, reinsurance costs, acquisition and operating expenses. Argo Group’s holding companies have access to various sources of liquidity including subsidiary dividends, its revolving credit facility and access to the debt and equity capital markets.

45

For the six months ended June 30, 2013, net cash used by operating activities increased to $96.2 million, compared to $28.4 million for the same period in 2012, primarily attributable to the partial settlement of a whole account quota share contract covering the Syndicate 1200 segment loss reserves for the 2009 and prior years of account. The source of the cash used to settle this reinsurance payable was the sale of fixed maturity assets, and is included in the cash from investing activities section of our Statements of Cash Flows.

From January 1, 2013 through June 30, 2013, we repurchased 753,576 shares of our common stock at an average price of $39.91 for a total cost of $30.1 million. From July 1, 2013 through July 31, 2013, we repurchased an additional 100,603 shares of our common stock at an average price of $44.61 for a total cost of $4.5 million. Since 2008, when we first began buying back our common shares, through July 31, 2013, we have repurchased 7,313,792 shares of our common stock at an average price of $32.82 for a total cost of $240.0 million.

On April 30, 2010, each of Argo Group International Holdings, Ltd., Argo Group US, Inc. (“Argo Group US”), Argo International Holdings Limited, and Argo Underwriting Agency Limited (the “Borrowers”) entered into a $150,000,000 Credit Agreement (“Credit Agreement”) with major money center banks. On July 22, 2011 the Borrowers entered into Amendment No. 2 to the Credit Agreement which increased the revolving credit facility under the Credit Agreement from $150 million to $170 million, extended the maturity date from April 30, 2013 to April 30, 2014, and modified certain other terms. Borrowings under the Credit Agreement may be used for general corporate purposes, including working capital and permitted acquisitions, and each of the Borrowers has agreed to be jointly and severally liable for the obligations of the other Borrowers under the Credit Agreement.

The Credit Agreement contains customary events of default. If an event of default occurs and is continuing, the Borrowers could be required to repay all amounts outstanding under the Credit Agreement. Lenders holding more than 51% of the loans and commitments under the Credit Agreement may elect to accelerate the maturity of the loans under the Credit Agreement upon the occurrence and during the continuation of an event of default. No defaults or events of defaults have occurred as of the date of this filing.

Currently, we do not have an outstanding balance under the $170.0 million credit facility. The credit facility allows up to $15.0 million of the facility to be used for letters of credit, subject to availability under the line. Currently, we have $0.8 million in LOCs issued and outstanding under the facility.

On May 7, 2013, our Board of Directors declared a 10% stock dividend, payable on June 17, 2013, to shareholders of record at the close of business on June 3, 2013. Shareholders received cash in lieu of fractional shares. On May 7, 2013, our Board of Directors declared a quarterly cash dividend in the amount of $0.15 on each share of common stock outstanding, on a post-stock dividend basis. On June 20, 2013, we paid $4.1 million to our shareholders of record on June 3, 2013.

On August 6, 2013, our Board of Directors approved the regular quarterly cash dividend of 15 cents per share on our common stock. The cash dividend will be paid on September 16, 2013, to shareholders of record at the close of business on September 2, 2013.

Refer to Part II, Item 7 - “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Liquidity and Capital Resources” in Argo Group’s Annual Report on Form 10-K for the year ended December 31, 2012 that Argo Group filed with the Securities and Exchange Commission on February 28, 2013 for further discussion on Argo Group’s liquidity.

Recent Accounting Standards and Critical Accounting Estimates

New Accounting Standards

The discussion of the adoption and pending adoption of recently issued accounting policies is included in Note 2, “Recently Issued Accounting Standards,” in the Notes to the Consolidated Financial Statements, included in Part I, Item 1—“Consolidated Financial Statements (unaudited).”

46

Critical Accounting Estimates

Refer to “Critical Accounting Estimates” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 that we filed with the Securities and Exchange Commission on February 28, 2013 for information on accounting policies that we consider critical in preparing our consolidated financial statements. These policies include significant estimates made by management using information available at the time the estimates were made. However, these estimates could change materially if different information or assumptions were used.

Income Taxes

We are incorporated under the laws of Bermuda and, under current Bermuda law, are not obligated to pay any taxes in Bermuda based upon income or capital gains. We have received an undertaking from the Supervisor of Insurance in Bermuda pursuant to the provisions of the Exempted Undertakings Tax Protection Act, 2011, which exempts us from any Bermuda taxes computed on profits, income or any capital asset, gain or appreciation, or any tax in the nature of estate duty or inheritance tax, at least until the year 2035.

We are not engaged in a trade or business in the United States or the United Kingdom and, accordingly, do not expect to be subject to direct United States or United Kingdom income taxation.

We have subsidiaries based in the United Kingdom that are subject to the tax laws of that country. Under current law, these subsidiaries are taxed at the applicable corporate tax rates. Six of the United Kingdom subsidiaries are deemed to be engaged in business in the United States and are therefore subject to United States corporate tax in respect of a proportion of their United States underwriting business only. Relief is available against the United Kingdom tax liabilities in respect of overseas taxes paid that arise from the underwriting business. Corporate income tax losses incurred in the United Kingdom can be carried forward, for application against future income, indefinitely. Our United Kingdom subsidiaries file separate United Kingdom income tax returns.

We have subsidiaries based in the United States that are subject to the tax laws of that country. Under current law, these subsidiaries are taxed at the applicable corporate tax rates. Our United States subsidiaries file a consolidated United States federal income tax return.

We also have operations in Belgium, Switzerland, Brazil, France, Malta and Ireland, which are subject to income taxes imposed by the jurisdiction in which they operate. We have operations in the United Arab Emirates, which are not subject to income tax under the laws of that country.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

We believe that we are principally exposed to three types of market risk: interest rate risk, credit risk and foreign currency risk.

Interest Rate Risk

Our fixed maturities portfolio is exposed to interest rate risk. Fluctuations in interest rates have a direct impact on the fair valuation of these securities. As interest rates rise, the fair value of our fixed maturity portfolio generally falls, and the converse is generally also true. We manage interest rate risk through an asset liability strategy that involves the selection of investments with appropriate characteristics, such as duration, yield, currency and liquidity that are tailored to the anticipated cash outflow characteristics of our liabilities. A significant portion of the investment portfolio matures each quarter, allowing for reinvestment at current market rates.

Credit Risk

We have exposure to credit risk primarily as a holder of fixed maturity investments, short-term investments, and other investments. Our risk management strategy and investment policy is to primarily invest in debt instruments of high credit quality issuers and to limit the amount of credit exposure with respect to particular ratings categories and any one issuer.

47

As shown on the accompanying table, our fixed maturities portfolio is diversified among different types of investments. The securities are rated by one or more National Recognized Statistical Rating Organizations, (i.e., Standard & Poor’s, Moody’s Investors Services, Inc., and Fitch Ratings, Ltd). If a security has two ratings, the lower rating is used, and if a security has three ratings, the middle rating is used in the preparation of this table. At June 30, 2013, our fixed maturities portfolio had a weighted average rating of AA-, with 79.5% ($2.2 billion fair value) rated A or better, and 38.2% ($1.1 billion fair value) rated AAA. Our portfolio included 6.3% ($175.0 million fair value) of less than investment grade (BB+ or lower) fixed maturities at June 30, 2013. We do not own any fixed maturity sovereign securities issued by Portugal, Ireland, Italy, Greece, or Spain.

(in millions)	Fair Value AAA		Fair Value AA		Fair Value A		Fair Value Other		Total
USD denominated:
U.S. Governments	$	304.5	$	—	$	—	$	0.8	$	305.3
Non-U.S. Governments		11.1		2.7		2.2		39.5		55.5
Obligations of states and political subdivisions		157.4		413.9		80.9		3.5		655.7
Credit-Financial		5.0		46.3		216.1		111.5		378.9
Credit-Industrial		4.8		12.4		128.3		254.6		400.1
Credit-Utility		0.0		18.5		31.6		129.0		179.1
Structured securities:
CMO/MBS-agency		297.7		0.0		0.0		0.0		297.7
CMO/MBS-non agency		0.0		1.3		2.3		6.8		10.4
CMBS		90.8		3.8		12.9		2.2		109.7
ABS-residential		0.9		0.0		0.0		7.4		8.3
ABS-non residential		75.6		1.6		1.0		2.8		81.0
Foreign denominated:
Governments		102.7		80.4		9.7		2.0		194.8
Credit		16.7		35.6		54.4		11.4		118.1
Total fixed maturities	$	1,067.2	$	616.5	$	539.4	$	571.5	$	2,794.6

Foreign Currency Risk

We have exposure to foreign currency risk in both our insurance contracts and our invested assets. Some of our insurance contracts provide that ultimate losses may be payable in various foreign currencies. Foreign currency exchange rate risk exists where we do not have cash or securities denominated in the currency for which we will ultimately pay the claims. Thus, we attempt to manage our foreign currency risk by seeking to match our liabilities under insurance and reinsurance polices that are payable in foreign currencies with cash and investments that are denominated in such currencies. In certain instances, we use foreign exchange forward and put option contracts to mitigate this risk. Due to the extended time frame for settling the claims plus the fluctuation in currency exchange rates, the potential exists for us to realize gains and or losses related to foreign exchange rates. In addition, we may experience foreign currency gains or losses related to exchange rate fluctuations in operating expenses as certain operating costs are payable in currencies other than the U.S. Dollar. For the three and six months ended June 30, 2013, we recorded realized gains of $5.9 million and $9.0 million from movements in foreign currency rates on our insurance operations, realized losses of $1.1 million and $4.8 million from movements on foreign currency rates in our investment portfolio, and realized losses of $3.9 million and $4.6 million from the currency forward contracts. In addition, we had unrealized losses at June 30, 2013 of $11.9 million on foreign currency rates in our investment portfolio, which is recorded in other comprehensive income. These losses are principally related to weakening of non-U.S. Dollar denominated investment exchange rates to the U.S. Dollar.

48

We enter into short-term, currency spot and forward contracts designed to mitigate foreign exchange rate exposure for certain non-U.S. Dollar denominated fixed maturity investments. The forward contracts used are typically less than sixty days and are renewed at the discretion of the investment manager, as long as the non-U.S. Dollar denominated higher yielding fixed maturities investments are held in the portfolio. Forward contracts are designated as hedges for accounting purposes. The net realized effect on income for the three and six months ended June 30, 2013 was not material.

Item 4. Controls and Procedures

Argo Group, under the supervision and with the participation of its management, including the Chief Executive Officer and the Chief Financial Officer, evaluated the effectiveness of the design and operation of our “disclosure controls and procedures” (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934) as of June 30, 2013. In designing and evaluating these disclosure controls and procedures, Argo Group and its management recognize that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily was required to apply its judgment in evaluating and implementing possible controls and procedures. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures were effective at the reasonable assurance level to ensure that information required to be disclosed by Argo Group in the reports filed or submitted under the Exchange Act are recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

There were no changes in the internal control over financial reporting made during the quarter ended June 30, 2013 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. We review our disclosure controls and procedures, which may include internal controls over financial reporting, on an ongoing basis. From time to time, management makes changes to enhance the effectiveness of these controls and ensure that they continue to meet the needs of our business activities over time.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Argo Group’s subsidiaries are parties to legal actions incidental to their business. Based on the opinion of counsel, management believes that the resolution of these matters will not materially affect our financial condition or results of operations.

Item 1a. Risk Factors

Terrorism Risk Insurance Program Reauthorization Act of 2007

On December 26, 2007, the President signed into law the Terrorism Risk Insurance Program Reauthorization Act of 2007, which extends the Terrorism Risk Insurance Act through December 31, 2014. The law extends the temporary federal program that provides for a transparent system of shared public and private compensation for insured losses resulting from acts of terrorism. The Department of the Treasury (“Treasury”) implements the program. On November 26, 2002, the President signed into law the Terrorism Risk Insurance Act of 2002 (“TRIA”). The Treasury on June 29, 2004, issued a final Claims Procedures Rule, effective July 31, 2004, as part of its implementation of title I of TRIA. TRIA also contains specific provisions designed to manage litigation arising out of, or resulting from, a certified act of terrorism. On July 28, 2004, Treasury issued a final rule concerning litigation management. On May 23, 2013 H.R. 2146 (Terrorism Risk Insurance Program Reauthorization Act of 2013) was introduced in Congress for the purpose of amending the Terrorism Risk Insurance Act of 2002 to extend the Terrorism Risk Insurance Program for a period of ten years (December 31, 2014 to December 31, 2024).

49

See “Risk Factors” in the Argo Group Annual Report on Form 10-K for the year ended December 31, 2012 for a detailed discussion of the additional risk factors affecting the Company.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchase of Equity Securities

On February 18, 2011, our Board of Directors authorized the repurchase of up to $150.0 million of our common shares (“2011 Repurchase Authorization”). The 2011 Repurchase Authorization supersedes the repurchase authorization approved on November 13, 2007 by the Board of Directors. Excluding the shares surrendered by employees in payment for the minimum required withholding taxes due to the vesting of restricted stock units, during the six months ended June 30, 2013, we repurchased 753,576 shares at a cost of $30.1 million.

As of June 30, 2013, we had repurchased a total of 7,213,189 of our common shares (total of $235.6 million repurchased) since the inception of the buy-back program in 2007. Shares of stock repurchased will be held as treasury shares in accordance with the provisions of the Bermuda Companies Act 1981.

The following table provides information with respect to shares of our common stock that were repurchased or surrendered during each of the three months ended June 30, 2013:

Period	Total Number of Shares Purchased (a)		Average Price Paid per Share (b)		Total Number of Shares Purchased as Part of Publicly Announced Plan or Program (c)		Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plan or Program (d)
April 1 through April 30, 2013		142,057	$	40.52		142,057	$	52,911,561
May 1 through May 31, 2013		134,989	$	42.50		134,621	$	47,187,974
June 1 through June 30, 2013		168,516	$	41.60		151,073	$	40,884,794
Total		445,562	$	41.54		427,751

Employees are allowed to surrender shares to settle the tax liability incurred upon the vesting of shares under the various employees equity compensation plans. For the three months ended June 30, 2013, we received 368 shares of our common stock that were surrendered by employees in payment for the minimum required withholding taxes due to the vesting of non-vested shares. Additionally, for the three months ended June 30, 2013, we received 17,443 shares of our common stock that were surrendered by an employee to net settle an option exercise. In the above table, these shares are included in columns (a) and (b), but excluded from columns (c) and (d). These shares do not reduce the number of shares that may yet be purchased under the repurchase plan.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

Item 6. Exhibits

A list of exhibits required to be filed as part of this report is set forth in the Exhibit Index of this Form 10-Q, which immediately precedes such exhibits, and is incorporated herein by reference.

50

EXHIBIT INDEX

Exhibit Number	Description
12.1	Statements of Computation of Ratios of Earnings to Fixed Charges and Earnings to Combined Fixed Charges and Preferred Share Dividends
31.1	Rule 13a – 14(a)/15d – 14(a) Certification of the Chief Executive Officer
31.2	Rule 13a – 14(a)/15d – 14(a) Certification of the Chief Financial Officer
32.1+	Certification of Chief Executive Officer 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 Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS++	XBRL Instance Document
101.SCH++	XBRL Taxonomy Extension Schema Document
101.CAL++	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF++	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB++	XBRL Taxonomy Extension Label Linkbase Document
101.PRE++	XBRL Taxonomy Extension Presentation Linkbase Document

+ This exhibit shall be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section, and shall not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.

++ As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.

51

SIGNATURES

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

	ARGO GROUP INTERNATIONAL HOLDINGS, LTD.
August 9, 2013	By:	/s/ Mark E. Watson III
	Mark E. Watson III
	President and Chief Executive Officer
August 9, 2013	By:	/s/ Jay S. Bullock
	Jay S. Bullock
	Executive Vice President and Chief Financial Officer

52

EX-12.1

Exhibit 12.1

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

STATEMENTS OF COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES

AND EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED SHARE DIVIDENDS

	Six Months Ended June 30,				Years Ended December 31,
(in millions, except ratios)	2013		2012		2012		2011			2010		2009		2008
Earnings:
Income (loss) from continuing operations before provision for income taxes	$	80.3	$	53.1	$	66.7	$	(61.9	)	$	121.9	$	139.1	$	79.6
Add:
Fixed charges		12.4		13.5		28.4		26.7			26.6		29.5		34.0
Total earnings	$	92.7	$	66.6	$	95.1	$	(35.2	)	$	148.5	$	168.6	$	113.6
Fixed charges:
Interest expense	$	10.0	$	11.2	$	23.7	$	22.1		$	22.9	$	25.7	$	29.9
Rental interest factor		2.4		2.3		4.7		4.6			3.7		3.8		4.1
Total fixed charges	$	12.4	$	13.5	$	28.4	$	26.7		$	26.6	$	29.5	$	34.0
Ratio of earnings to fixed charges		7.5:1		4.9:1		3.3:1		(a	)		5.6:1		5.7:1		3.3:1

(a) The coverage deficiency for the year ended December 31, 2011 is $61.9 million.

EX-31.1

Exhibit 31.1

Rule 13a-14(a)/15d-14(a)

Certification of the Chief Executive Officer

I, Mark E. Watson III, President and Chief Executive Officer of Argo Group International Holdings, Ltd., certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Argo Group International Holdings, 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 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 9, 2013

/s/ Mark E. Watson III

Mark E. Watson III

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Rule 13a-14(a)/15d-14(a)

Certification of the Chief Financial Officer

I, Jay S. Bullock, Executive Vice President and Chief Financial Officer of Argo Group International Holdings, Ltd., certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Argo Group International Holdings, 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 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 9, 2013

/s/ Jay S. Bullock

Jay S. Bullock

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification of CEO 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 on Form 10-Q of Argo Group International Holdings, Ltd. (the “Company”) for the quarterly period ended June 30, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Mark E. Watson III, as President and Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

*        *        *

Certified this 9^th day of August 2013.

/s/ Mark E. Watson III

Mark E. Watson III

President and Chief Executive Officer

EX-32.2

Exhibit 32.2

Certification of CFO 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 on Form 10-Q of Argo Group International Holdings, Ltd. (the “Company”) for the quarterly period ended June 30, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Jay S. Bullock, as Executive Vice President and Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002 that, to the best of his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

*        *        *

Certified this 9^th day of August 2013.

/s/ Jay S. Bullock

Jay S. Bullock

Executive Vice President and Chief Financial Officer

XML

Disclosures about Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financial Instruments Owned and Pledged as Collateral [Line Items]
Premiums receivable	$ 448.6	$ 361.0
Reinsurance recoverable	1,249.70	1,320.90
Over 90 Days [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Premiums receivable	23.2	24.3
Reinsurance recoverable	17.10	18.00
Premiums receivable, allowance for doubtful accounts	3.5	2.5
Reinsurance recoverables, allowance for doubtful accounts	2.3	2.2
Premiums receivable, secured by collateral	0.7	0.4
Reinsurance recoverables, secured by collateral	$ 0.3	$ 0.3

XML

Information Provided in Connection With Outstanding Debt of Subsidiaries - Additional Information (Detail) (Senior Notes [Member], USD $)	9 Months Ended
	Sep. 30, 2012
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of Agro Group	$ 143,750,000
Interest rate of principal amount	6.50%
Percentage of amount redeemed	100.00%

XML

Derivative Instruments

6 Months Ended

Jun. 30, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Instruments

11. Derivative Instruments

Through our subsidiary Argo Re, Ltd., in 2011 we entered into two reinsurance contracts with a special purpose reinsurance company that provided us with protection against certain severe catastrophe events and the occurrence of multiple significant catastrophe events during the same year. The first contract was effective June 18, 2011 and provided coverage of $100 million for hurricanes and earthquakes in the U.S., windstorms in Europe, and earthquakes in Japan based on the occurrence of second and subsequent events on a per-occurrence basis over an 18-month coverage period. Each event had an activation level, which, if attained, put the notes on risk for a subsequent event. Once the coverage had been activated, a second loss during the Coverage Period in excess of the loss trigger level results in a loss to the note holders. The first contract expired in December 2012. The second contract entered into on December 28, 2011 and effective January 1, 2012, provides coverage of $100 million for hurricanes and earthquakes (including fire) in the U.S. and covers losses for the first and subsequent events on a per-occurrence basis over a 24-month coverage period. Both of these transactions ignore the effects of inuring reinsurance, creating the remote possibility of a double recovery on covered events, and are therefore deemed to be derivatives.

We recorded these contracts at fair value, and such fair value is included in “Other assets” in our Consolidated Balance Sheets with any changes in the value reflected in “Other reinsurance-related expenses” in the Consolidated Statements of Income. As there is no quoted fair value available for these derivatives, the fair value was estimated by management taking into account changes in the market for catastrophe bond reinsurance contracts with similar economic characteristics and potential recoveries from events preceding the valuation date. Included in “Other reinsurance-related expenses” for the three and six months ended June 30, 2013 was $4.7 million and $9.8 million, respectively, and $6.9 million and $13.8 million for the three and six months ended June 30, 2012. The expense in each respective period was due to the change in the fair value of the derivatives, principally due to the passage of the transaction’s risk coverage term. Included in “Other assets” in our Consolidated Balance Sheets were $3.3 million and $6.9 million, which represent the fair value of these contracts at June 30, 2013 and December 31, 2012, respectively.

The special purpose reinsurance company that is the counterparty to these transactions is a variable interest entity under the provisions of ASC Topic 810-10. Argo Group is not the primary beneficiary of this entity and is therefore not required to consolidate it in its consolidated financial statements.

XML

Income Taxes - Income Tax Provision (Benefit) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Current tax provision	$ 8.1	$ 1.9	$ 9.9	$ 5.5
Future tax deductions	2.0	(1.5)	4.4	2.9
Valuation allowance change	1.0	0.6	1.6	1.1
Income tax provision	$ 11.1	$ 1.0	$ 15.9	$ 9.5

XML

CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Premiums and other revenue:
Earned premiums	$ 327.5	$ 290.2	$ 631.7	$ 567.5
Net investment income	25.3	30.0	53.2	61.4
Fee income, net	0.2	0.5	0.2	1.8
Net realized investment gains (losses)	11.0	(2.7)	20.5	10.4
Total revenue	364.0	318.0	705.6	641.1
Expenses:
Losses and loss adjustment expenses	192.7	175.8	363.2	341.6
Other reinsurance-related expenses	4.7	6.9	9.8	13.8
Underwriting, acquisition and insurance expenses	124.6	114.6	251.3	228.3
Interest expense	5.1	5.5	10.0	11.2
Foreign currency exchange (gain) loss	(5.9)	(9.8)	(9.0)	(6.9)
Total expenses	321.2	293.0	625.3	588.0
Income before income taxes	42.8	25.0	80.3	53.1
Provision for income taxes	11.1	1.0	15.9	9.5
Net income	31.7	24.0	64.4	43.6
Net income per common share:
Basic	$ 1.18	$ 0.93	$ 2.37	$ 1.68
Diluted	$ 1.13	$ 0.92	$ 2.29	$ 1.66
Dividend declared per common share:	$ 0.15	$ 0.12	$ 0.30	$ 0.24
Weighted average common shares:
Basic	26,962,397	25,684,818	27,103,917	25,931,114
Diluted	28,009,590	26,071,147	28,082,545	26,276,728
Net realized investment gains (losses) before other-than-temporary impairment losses	11.4	(1.9)	25.7	11.3
Other-than-temporary impairment losses recognized in earnings
Other-than-temporary impairment losses on fixed maturities	(0.3)	(0.3)	(0.3)	(0.3)
Other-than-temporary impairment losses on equity securities	(0.1)	(0.5)	(1.5)	(0.6)
Other-than-temporary impairment losses on other investments	0	0	(3.4)	0
Non-credit portion of losses recognized in other comprehensive income	0	0	0	0
Impairment losses recognized in earnings	(0.4)	(0.8)	(5.2)	(0.9)
Net realized investment gains (losses)	$ 11.0	$ (2.7)	$ 20.5	$ 10.4

XML

Shareholders' Equity

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Shareholders' Equity

4. Shareholders’ Equity

On May 7, 2013, our Board of Directors declared a 10% stock dividend, payable on June 17, 2013, to shareholders of record at the close of business on June 3, 2013. As a result of the stock dividend, 2,447,839 additional shares were issued. Cash was paid in lieu of fractional shares of the Company’s common shares.

On May 7, 2013, our Board of Directors declared a quarterly cash dividend in the amount of $0.15 on each share of common stock outstanding, on a post-stock dividend basis. On June 20, 2013, we paid $4.1 million to our shareholders of record on June 3, 2013. On May 8, 2012, our Board of Directors declared a quarterly cash dividend in the amount of $0.12, on each share of common stock outstanding. On June 15, 2012, we paid $3.1 million to our shareholders of record on June 1, 2012.

For the six months ended June 30, 2013 and 2012, we have paid cash dividends totaling $7.8 million and $6.2 million to our shareholders.

On February 18, 2011, our Board of Directors authorized the repurchase of up to $150.0 million of our common shares (“2011 Repurchase Authorization”). The 2011 Repurchase Authorization supersedes the November 13, 2007 repurchase authorization, which also had authorized the repurchase of up to $150.0 million of our common shares. From inception of the repurchase authorizations through July 31, 2013, we have repurchased 7,313,792 shares of our common stock at an average price of $32.82 for a total cost of $240.0 million. These shares are being held as treasury shares in accordance with the provisions of the Bermuda Companies Act 1981. As of July 31, 2013, availability under the 2011 Repurchase Authorization for future repurchases of our common shares was $36.4 million.

For the three and six months ended June 30, 2013, we repurchased a total of 427,751 and 753,576 common shares for $17.8 million and $30.1 million respectively. A summary of activity from January 1, 2013 through July 31, 2013 follows.

For the three and six months ended June 30, 2013, we repurchased 184,430 and 282,030 common shares on the open market for $7.8 million and $11.6 million, respectively. In 2013, we repurchased shares under Securities Exchange Act of 1934 Rule 10b5-1 trading plans as follows:

Date Trading Plan Initiated	2013 Purchase Period	Number of Shares Repurchased	Average Price of Shares Repurchased		Total Cost (in millions)		Repurchase Authorization Year
12/14/2012	01/01/13-01/17/13 (1)	171,480	$	35.41	$	6.0	2011
03/15/2013	03/16/13-05/01/13 (2)	205,452	$	40.75	$	8.3	2011
06/14/2013	06/18/13-07/31/13 (3)	195,217	$	43.47	$	8.5	2011

⁽¹⁾  The above table only reflects the 2013 activity under this Rule 10b5-1 trading plan. In 2012, 117,663 shares were repurchased under this Rule 10b5-1 trading plan for a total cost of $3.9 million. Total shares repurchased in 2012 and 2013 under this Rule 10b5-1 trading plan are 289,143 shares at an average price of $34.58 for a total cost of $9.9 million.

⁽²⁾  Through March 31, 2013, 56,745 shares were repurchased at an average price of $41.17 for a total cost of $2.3 million.

⁽³⁾  Through June 30, 2013, 94,614 shares were repurchased at an average price of $42.26 for a total cost of $4.0 million.

XML

Investments (Tables)

6 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Investments

The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investments as of June 30, 2013 and December 31, 2012 were as follows:

June 30, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	302.1	$	3.8	$	0.6	$	305.3
Non-U.S. Governments		58.0		0.4		2.9		55.5
Obligations of states and political subdivisions		641.1		26.6		12.0		655.7
Credit-Financial		368.1		14.5		3.7		378.9
Credit-Industrial		389.1		16.4		5.4		400.1
Credit-Utility		174.7		6.3		1.9		179.1
Structured securities:
CMO/MBS-agency (1)		289.3		11.1		2.7		297.7
CMO/MBS-non agency		9.5		0.9		0.0		10.4
CMBS (2)		107.6		3.6		1.5		109.7
ABS-residential (3)		8.6		0.2		0.5		8.3
ABS-non residential		80.7		0.6		0.3		81.0
Foreign denominated:
Governments		202.0		1.8		9.0		194.8
Credit		122.1		2.1		6.1		118.1
Total fixed maturities		2,752.9		88.3		46.6		2,794.6
Equity securities		414.1		190.3		4.7		599.7
Other investments		313.7		2.7		4.8		311.6
Short-term investments		279.7		0.0		0.2		279.5
Total investments	$	3,760.4	$	281.3	$	56.3	$	3,985.4
December 31, 2012	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	401.1	$	9.3	$	0.0	$	410.4
Non-U.S. Governments		53.1		3.6		0.1		56.6
Obligations of states and political subdivisions		551.7		44.9		0.5		596.1
Credit-Financial		382.4		25.7		0.7		407.4
Credit-Industrial		428.4		31.1		0.7		458.8
Credit-Utility		189.9		12.6		0.4		202.1
Structured securities:
CMO/MBS-agency (1)		375.1		20.2		0.2		395.1
CMO/MBS-non agency		12.5		1.0		0.2		13.3
CMBS (2)		109.5		5.7		0.2		115.0
ABS-residential (3)		10.1		0.2		0.8		9.5
ABS-non residential		81.3		1.2		0.0		82.5
Foreign denominated:
Governments		262.1		9.2		4.3		267.0
Credit		135.9		6.1		1.8		140.2
Total fixed maturities		2,993.1		170.8		9.9		3,154.0
Equity securities		383.5		153.0		5.1		531.4
Other investments		284.8		1.2		5.0		281.0
Short-term investments		234.3		0.1		0.1		234.3
Total investments	$	3,895.7	$	325.1	$	20.1	$	4,200.7

⁽¹⁾ Collateralized mortgage obligations/mortgage-backed securities (“CMO/MBS”).

⁽²⁾ Commercial mortgage-backed securities (“CMBS”).

⁽³⁾ Asset-backed securities (“ABS”).

Schedule of Amortized Cost and Fair Values of Fixed Maturity Investments, by Contractual Maturity

The amortized cost and fair values of fixed maturity investments as of June 30, 2013, by contractual maturity, were as follows:

(in millions)	Amortized Cost		Fair Value
Due in one year or less	$	203.5	$	204.6
Due after one year through five years		1,041.7		1,052.8
Due after five years through ten years		727.0		750.0
Thereafter		285.0		280.1
Structured securities		495.7		507.1
Total	$	2,752.9	$	2,794.6

Schedule of Aging of Unrealized Losses on Investments

An aging of unrealized losses on our investments at June 30, 2013 and December 31, 2012 is presented below:

June 30, 2013	Less Than One Year					One Year or Greater				Total
(in millions)	Fair Value			Unrealized Losses		Fair Value		Unrealized Losses		Fair Value			Unrealized Losses
Fixed maturities
USD denominated:
U.S. Governments	$	66.8		$	0.6	$	0.0	$	0.0	$	66.8		$	0.6
Non-U.S. Governments (1)		40.0			2.9		0.2		0.0		40.2			2.9
Obligations of states and political subdivisions		220.1			12.0		0.0		0.0		220.1			12.0
Credit-Financial		116.8			3.6		1.5		0.1		118.3			3.7
Credit-Industrial		123.6			5.3		0.1		0.1		123.7			5.4
Credit-Utility		46.5			1.9		0.0		0.0		46.5			1.9
Structured securities:
CMO/MBS-agency (1)		80.2			2.7		0.7		0.0		80.9			2.7
CMBS		31.2			1.5		0.0		0.0		31.2			1.5
ABS-residential		0.0			0.0		4.6		0.5		4.6			0.5
ABS-non residential		49.3			0.3		0.0		0.0		49.3			0.3
Foreign denominated:
Governments		173.2			9.0		0.0		0.0		173.2			9.0
Credit		110.7			6.1		0.0		0.0		110.7			6.1
Total fixed maturities		1,058.4			45.9		7.1		0.7		1,065.5			46.6
Equity securities		58.0			4.7		0.0		0.0		58.0			4.7
Other investments		(4.8	)		4.8		0.0		0.0		(4.8	)		4.8
Short-term investments		0.0			0.2		0.0		0.0		0.0			0.2
Total	$	1,111.6		$	55.6	$	7.1	$	0.7	$	1,118.7		$	56.3

⁽¹⁾  Unrealized losses one year or greater are less than $0.1 million.

December 31, 2012	Less Than One Year				One Year or Greater				Total
(in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Fixed maturities
USD denominated:
U.S. Governments (1)	$	11.9	$	0.0	$	0.0	$	0.0	$	11.9	$	0.0
Non-U.S. Governments (2)		8.5		0.1		0.5		0.0		9.0		0.1
Obligations of states and political subdivisions		28.2		0.3		0.8		0.2		29.0		0.5
Credit-Financial		25.0		0.2		8.6		0.5		33.6		0.7
Credit-Industrial		32.2		0.4		3.0		0.3		35.2		0.7
Credit-Utility		8.4		0.2		0.8		0.2		9.2		0.4
Structured securities:
CMO/MBS-agency (2)		26.4		0.2		0.3		0.0		26.7		0.2
CMO/MBS-non agency		1.7		0.2		0.0		0.0		1.7		0.2
CMBS (1)		5.7		0.0		3.5		0.2		9.2		0.2
ABS-residential		0.0		0.0		3.9		0.8		3.9		0.8
ABS-non residential (1) (2)		13.7		0.0		0.2		0.0		13.9		0.0
Foreign denominated:
Governments (2)		180.5		4.3		0.3		0.0		180.8		4.3
Credit		76.3		1.8		0.0		0.0		76.3		1.8
Total fixed maturities		418.5		7.7		21.9		2.2		440.4		9.9
Equity securities		60.2		4.2		6.3		0.9		66.5		5.1
Other investments		11.6		5.0		0.0		0.0		11.6		5.0
Short-term investments		0.0		0.1		0.0		0.0		0.0		0.1
Total	$	490.3	$	17.0	$	28.2	$	3.1	$	518.5	$	20.1

⁽¹⁾  Unrealized losses less than one year are less than $0.1 million.

⁽²⁾  Unrealized losses one year or greater are less than $0.1 million.

Schedule of Company's Gross Realized Investment Gains (Losses)

The following table presents the Company’s gross realized investment gains (losses) for the three and six months ended June 30:

(in millions)	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Realized gains
Fixed maturities	$	10.2		$	7.2		$	21.7		$	15.5
Equity securities		7.2			0.2			7.7			0.2
Other investments		6.5			1.6			17.6			13.1
Short-term investments		0.0			0.1			0.1			0.3
Gross realized gains		23.9			9.1			47.1			29.1
Realized losses
Fixed maturities		(1.9	)		(2.2	)		(8.4	)		(5.1	)
Equity securities		(0.7	)		(0.2	)		(0.7	)		(0.3	)
Other investments		(9.8	)		(8.3	)		(12.1	)		(12.1	)
Short-term investments		(0.1	)		(0.3	)		(0.2	)		(0.3	)
Other-than-temporary impairment losses on fixed maturities		(0.3	)		(0.3	)		(0.3	)		(0.3	)
Other-than-temporary impairment losses on equity securities		(0.1	)		(0.5	)		(1.5	)		(0.6	)
Other-than-temporary impairment losses on other investments		0.0			0.0			(3.4	)		0.0
Gross realized losses		(12.9	)		(11.8	)		(26.6	)		(18.7	)
Net realized investment (losses) gains	$	11.0		$	(2.7	)	$	20.5		$	10.4

Securities and Letters of Credit Pledged to Lloyd's as Company's Corporate Member's Capital

At June 30, 2013, our Corporate member’s capital supporting our Lloyd’s business consisted of:

Letters of credit	$	124.9
Fixed maturities, at fair value		154.6
Short-term investments, at fair value		0.1
Total securities and letters of credit pledged to Lloyd’s	$	279.6

Financial Assets Measured at Fair Value on Recurring Basis

Based on an analysis of the inputs, our financial assets measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012 have been categorized as follows:

(in millions)	June 30, 2013		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	305.3	$	143.0	$	162.3	$	0.0
Non-U.S. Governments		55.5		0.0		55.5		0.0
Obligations of states and political subdivisions		655.7		0.0		655.7		0.0
Credit-Financial		378.9		0.0		378.9		0.0
Credit-Industrial		400.1		0.0		400.1		0.0
Credit-Utility		179.1		0.0		179.1		0.0
Structured securities:
CMO/MBS-agency		297.7		0.0		297.7		0.0
CMO/MBS-non agency		10.4		0.0		10.4		0.0
CMBS		109.7		0.0		109.7		0.0
ABS-residential		8.3		0.0		8.3		0.0
ABS-non residential		81.0		0.0		81.0		0.0
Foreign denominated:
Governments		194.8		0.0		194.8		0.0
Credit		118.1		0.0		118.1		0.0
Total fixed maturities		2,794.6		143.0		2,651.6		0.0
Equity securities		599.7		515.5		82.3		1.9
Other investments		126.4		0.0		126.4		0.0
Short-term investments		279.5		255.3		24.2		0.0
Other assets		3.3		0.0		0.0		3.3
	$	3,803.5	$	913.8	$	2,884.5	$	5.2

^(a)  Quoted prices in active markets for identical assets

^(b)  Significant other observable inputs

^(c)  Significant unobservable inputs

(in millions)	December 31, 2012		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	410.4	$	219.5	$	190.9	$	0.0
Non-U.S. Governments		56.6		0.0		56.6		0.0
Obligations of states and political subdivisions		596.1		0.0		596.1		0.0
Credit-Financial		407.4		0.0		407.4		0.0
Credit-Industrial		458.8		0.0		458.8		0.0
Credit-Utility		202.1		0.0		202.1		0.0
Structured securities:
CMO/MBS-agency		395.1		0.0		395.1		0.0
CMO/MBS-non agency		13.3		0.0		13.3		0.0
CMBS		115.0		0.0		115.0		0.0
ABS-residential		9.5		0.0		9.5		0.0
ABS-non residential		82.5		0.0		82.5		0.0
Foreign denominated:
Governments		267.0		0.0		267.0		0.0
Credit		140.2		0.0		140.2		0.0
Total fixed maturities		3,154.0		219.5		2,934.5		0.0
Equity securities		531.4		469.0		60.6		1.8
Other investments		132.0		0.0		132.0		0.0
Short-term investments		234.3		201.1		33.2		0.0
Other assets		6.9		0.0		0.0		6.9
	$	4,058.6	$	889.6	$	3,160.3	$	8.7

^(a)  Quoted prices in active markets for identical assets

^(b)  Significant other observable inputs

^(c)  Significant unobservable inputs

Schedule of Reconciliation of Beginning and Ending Balances for Investments Categorized as Level 3

A reconciliation of the beginning and ending balances for the investments categorized as Level 3 at June 30, 2013 and December 31, 2012 are as follows:

Fair Value Measurements Using Unobservable Inputs (Level 3)

(in millions)	Equity Securities		Other Assets			Total
Beginning balance, January 1, 2013	$	1.8	$	6.9		$	8.7
Transfers into Level 3		0.0		0.0			0.0
Transfers out of Level 3		0.0		0.0			0.0
Total gains or losses (realized/unrealized):
Included in net income		0.0		0.0			0.0
Included in other comprehensive income		0.1		0.0			0.1
Purchases, issuances, sales, and settlements
Purchases		0.0		0.0			0.0
Issuances		0.0		0.0			0.0
Sales		0.0		0.0			0.0
Settlements		0.0		(3.6	)		(3.6	)
Ending balance, June 30, 2013	$	1.9	$	3.3		$	5.2
Amount of total gains or losses for the period included in net income attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2013	$	0.0	$	0.0		$	0.0

Fair Value Measurements Using Unobservable Inputs (Level 3)

(in millions)	Credit Financial			Equity Securities			Other Assets			Total
Beginning balance, January 1, 2012	$	0.7		$	2.4		$	9.0		$	12.1
Transfers into Level 3		0.0			0.0			0.0			0.0
Transfers out of Level 3		0.0			0.0			0.0			0.0
Total gains or losses (realized/unrealized):
Included in net income		0.1			0.0			0.0			0.1
Included in other comprehensive income		0.0			0.0			0.0			0.0
Purchases, issuances, sales, and settlements
Purchases		0.0			0.0			0.0			0.0
Issuances		0.0			0.0			0.0			0.0
Sales		(0.8	)		(0.6	)		0.0			(1.4	)
Settlements		0.0			0.0			(2.1	)		(2.1	)
Ending balance, December 31, 2012	$	0.0		$	1.8		$	6.9		$	8.7
Amount of total gains or losses for the period included in net loss attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2012	$	0.0		$	0.0		$	0.0		$	0.0

XML

Derivative Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 18, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 28, 2011	Dec. 31, 2011 Contract	Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Number of reinsurance contracts							2
Coverage amount	$ 100					$ 100
Coverage period, months	18 months					24 months
Other reinsurance-related expenses		4.7	6.9	9.8	13.8
Other assets		$ 3.3		$ 3.3				$ 6.9

XML

Income Taxes - Reconciliation of Difference Between Provision for Income Taxes and Expected Tax Provision at Weighted Average Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Examination [Line Items]
Income tax provision at expected rate	$ 12.3	$ 4.4	$ 19.0	$ 13.7
Tax-exempt interest	(1.4)	(1.6)	(2.8)	(3.0)
Dividends received deduction	(0.5)	(0.5)	(1.1)	(0.9)
Valuation allowance change	1.0	0.6	1.6	1.1
Other permanent adjustments, net	0	0.2	(0.9)	0.7
Adjustment for annualized rate	(0.8)	0.2	(0.4)	0
United States state tax benefit	(0.1)	(0.1)	(0.3)	(0.2)
Other foreign adjustments	0	0.1	0	0.1
Foreign exchange adjustments	0.2	(2.3)	0.4	(2.0)
Foreign withholding taxes	0.4	0	0.4	0
Income tax provision	11.1	1.0	15.9	9.5
Foreign Country [Member]
Income Tax Examination [Line Items]
Income tax provision	2.7	0.2	4.3	1.6
United States Federal [Member]
Income Tax Examination [Line Items]
Income tax provision	8.2	1.1	11.7	8.3
United States State [Member]
Income Tax Examination [Line Items]
Foreign withholding taxes	0.4	0	0.4	0
Income tax provision	$ (0.2)	$ (0.3)	$ (0.5)	$ (0.4)

XML

Underwriting, Acquisition and Insurance Expenses

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Underwriting, Acquisition and Insurance Expenses

12. Underwriting, Acquisition and Insurance Expenses

Underwriting, acquisition and insurance expenses for the three and six months ended June 30, 2013 and 2012 were as follows:

	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Commissions	$	65.6		$	51.3		$	117.5		$	100.7
General expenses		66.7			61.5			135.4			122.0
Premium taxes, boards and bureaus		6.1			6.0			12.9			12.1
		138.4			118.8			265.8			234.8
Net (deferral) amortization of policy acquisition costs		(13.8	)		(4.2	)		(14.5	)		(6.5	)
Total underwriting, acquisition and insurance expenses	$	124.6		$	114.6		$	251.3		$	228.3

Included in general expenses for the three and six months ended June 30, 2013, was $4.5 million and $11.0 million in additional expense for our cash settled stock appreciation rights, due to the increase in our stock price.

XML

Shareholders' Equity - Schedule of Repurchase of Shares (Parenthetical) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2013 Rule 10b5-1 [Member]	Dec. 31, 2012 Rule 10b5-1 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Number of Shares Repurchased	427,751				117,663
Total Cost	$ 17.8			$ 9.9	$ 3.9
Total Number of Shares Repurchased	94,614	56,745	94,614	289,143
Total Average Price of Shares Repurchased				$ 34.58
Total cost	$ 4.0	$ 2.3	$ 4.0
Average Price of Shares Repurchased		$ 41.17	$ 42.26

XML

Information Provided in Connection with Outstanding Debt of Subsidiaries - Condensed Consolidating Statement of (Loss) Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Premiums and other revenue:
Earned premiums	$ 327.5	$ 290.2	$ 631.7	$ 567.5
Net investment income	25.3	30.0	53.2	61.4
Fee income, net	0.2	0.5	0.2	1.8
Net realized investment gains	11.0	(2.7)	20.5	10.4
Total revenue	364.0	318.0	705.6	641.1
Expenses:
Losses and loss adjustment expenses	192.7	175.8	363.2	341.6
Other reinsurance-related expenses	4.7	6.9	9.8	13.8
Underwriting, acquisition and insurance expenses	124.6	114.6	251.3	228.3
Interest expense	5.1	5.5	10.0	11.2
Foreign currency exchange (gain) loss	(5.9)	(9.8)	(9.0)	(6.9)
Total expenses	321.2	293.0	625.3	588.0
(Loss) income before income taxes	42.8	25.0	80.3	53.1
Provision for income taxes	11.1	1.0	15.9	9.5
Net (loss) income before equity in earnings of subsidiaries	31.7	24.0	64.4	43.6
Equity in undistributed earnings of subsidiaries	0	0	0	0
Net income	31.7	24.0	64.4	43.6
Argo Group International Holdings, Ltd (Parent Guarantor) [Member]
Premiums and other revenue:
Earned premiums	0	0	0	0
Net investment income	0	0	0	0
Fee income, net	0	0	0	0
Net realized investment gains	0	0	0	0
Total revenue	0	0	0	0
Expenses:
Losses and loss adjustment expenses	0	0	0	0
Other reinsurance-related expenses	0	0	0	0
Underwriting, acquisition and insurance expenses	6.3	7.6	12.5	14.7
Interest expense	0.8	1.0	1.6	1.9
Foreign currency exchange (gain) loss	0.1	0	0	0
Total expenses	7.2	8.6	14.1	16.6
(Loss) income before income taxes	(7.2)	(8.6)	(14.1)	(16.6)
Provision for income taxes	0	0	0	0
Net (loss) income before equity in earnings of subsidiaries	(7.2)	(8.6)	(14.1)	(16.6)
Equity in undistributed earnings of subsidiaries	38.9	32.6	78.5	60.2
Net income	31.7	24.0	64.4	43.6
Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer) [Member]
Premiums and other revenue:
Earned premiums	108.3	109.9	216.0	218.8
Net investment income	19.6	22.3	40.5	44.2
Fee income, net	(1.0)	(0.2)	(1.3)	0
Net realized investment gains	18.0	(2.1)	25.6	7.5
Total revenue	144.9	129.9	280.8	270.5
Expenses:
Losses and loss adjustment expenses	64.7	74.4	129.0	142.9
Other reinsurance-related expenses	1.4	0	2.9	0
Underwriting, acquisition and insurance expenses	43.5	42.9	92.2	86.1
Interest expense	3.9	3.8	7.6	7.6
Foreign currency exchange (gain) loss	0	0.3	0.2	0.2
Total expenses	113.5	121.4	231.9	236.8
(Loss) income before income taxes	31.4	8.5	48.9	33.7
Provision for income taxes	8.4	0.9	11.6	7.9
Net (loss) income before equity in earnings of subsidiaries	23.0	7.6	37.3	25.8
Equity in undistributed earnings of subsidiaries	0	0	0	0
Net income	23.0	7.6	37.3	25.8
Other Subsidiaries and Eliminations [Member]
Premiums and other revenue:
Earned premiums	219.2	180.3	415.7	348.7
Net investment income	6.0	7.7	13.3	17.2
Fee income, net	1.2	0.7	1.5	1.8
Net realized investment gains	(7.0)	(0.6)	(5.1)	2.9
Total revenue	219.4	188.1	425.4	370.6
Expenses:
Losses and loss adjustment expenses	128.0	101.4	234.2	198.7
Other reinsurance-related expenses	3.3	6.9	6.9	13.8
Underwriting, acquisition and insurance expenses	74.8	64.1	146.6	127.5
Interest expense	0.7	0.7	1.4	1.7
Foreign currency exchange (gain) loss	(6.0)	(10.1)	(9.2)	(7.1)
Total expenses	200.8	163.0	379.9	334.6
(Loss) income before income taxes	18.6	25.1	45.5	36.0
Provision for income taxes	2.7	0.1	4.3	1.6
Net (loss) income before equity in earnings of subsidiaries	15.9	25.0	41.2	34.4
Equity in undistributed earnings of subsidiaries	0	0	0	0
Net income	15.9	25.0	41.2	34.4
Consolidating Adjustments [Member]
Premiums and other revenue:
Earned premiums	0	0	0	0
Net investment income	(0.3)	0	(0.6)	0
Fee income, net	0	0	0	0
Net realized investment gains	0	0	0	0
Total revenue	(0.3)	0	(0.6)
Expenses:
Losses and loss adjustment expenses	0	0	0	0
Other reinsurance-related expenses	0	0	0	0
Underwriting, acquisition and insurance expenses	0	0	0	0
Interest expense	(0.3)	0	(0.6)	0
Foreign currency exchange (gain) loss	0	0	0	0
Total expenses	(0.3)	0	(0.6)	0
(Loss) income before income taxes	0	0	0	0
Provision for income taxes	0	0	0	0
Net (loss) income before equity in earnings of subsidiaries	0	0	0	0
Equity in undistributed earnings of subsidiaries	(38.9)	(32.6)	(78.5)	(60.2)
Net income	$ (38.9)	$ (32.6)	$ (78.5)	$ (60.2)

XML

Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended				6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Malta [Member]	Jun. 30, 2013 Brazil [Member]	Jun. 30, 2013 ARIS [Member]	Jun. 30, 2012 December 31, 2025 [Member]	Jun. 30, 2012 December 31, 2027 [Member]	Jun. 30, 2013 PXRE Reinsurance Company [Member]
Income Tax Contingency [Line Items]
Total net deferred tax assets	$ 25.1
Capital loss carryforward	30.2
Net operating loss carryforward	18.7			1.0
Loss carryforwards, amounts expiring if not utilized					17.2	1.5
Valuation allowance	54.1
Loss carryforwards per year	2.8
Reduced valuation allowance							0.5
Increased valuation allowance		$ 0.3	$ 1.8

XML

Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Security	Jun. 30, 2012	Jun. 30, 2013 D Security	Jun. 30, 2012	Dec. 31, 2012	Dec. 28, 2011	Jun. 18, 2011
Schedule of Investments [Line Items]
Fair value of investments, assets managed on behalf of the trade capital providers	$ 89.2		$ 89.2		$ 143.9
Number of securities in an unrealized loss position, total	6,413		6,413
Number of securities in an unrealized loss position for less than one year			2,160
Number of securities in an unrealized loss position for a period of one year or greater			18
Other-than-temporary impairment losses on fixed maturities	0.3	0.3	0.3	0.3
Other-than-temporarily losses equity portfolio	0.1	0.5	1.5	0.6
Other-than-temporary impairment losses on other investments	0	0	3.4	0
Forward contracts, term, days			60
Foreign exchange realized losses on forwards	0.1	0.2	0.1	0.2
Total notional amount of the Company's holdings in non-U.S. Dollar denominated higher yielding fixed maturity investments	2.0	2.3	2.0	2.3
Notional amount of the currency forward contracts						100.0	100.0
Fair value of put option	4.8	0.4	4.8	0.4
Realized gains from currency forward contracts		0.5		3.9
Realized losses from currency forward contracts	3.9		4.6
Amortized Cost	3,760.4		3,760.4		3,895.7
Fair Value	3,985.4		3,985.4		4,200.7
Loss and loss expense reserve	68.4		68.4
Underwriting business at Lloyd's	124.9		124.9
Currency forward contracts [Member]
Schedule of Investments [Line Items]
Notional amount of the currency forward contracts	68.2	113.2	68.2	113.2
Deposit with Various U.S. Insurance and Other Regulatory Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	212.9		212.9
Fair Value	221.9		221.9
Securities Pledged As Collateral [Member]
Schedule of Investments [Line Items]
Pledged assets separately reported, securities pledged under letters of credit facilities, at amortized cost	245.7		245.7
Pledged assets separately reported, securities pledged under letters of credit facilities, at fair value	247.9		247.9
Non-U.S. Denominated Fixed Maturity Investments [Member]
Schedule of Investments [Line Items]
Total notional amount of the Company's holdings in non-U.S. Dollar denominated higher yielding fixed maturity investments	$ 1.9	$ 2.3	$ 1.9	$ 2.3

XML

Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Changes in Accumulated Other Comprehensive Income

A summary of changes in accumulated other comprehensive income, net of taxes (where applicable) by component for the three and six months ended June 30, 2013 is presented in the following table:

(in millions)	Foreign currency translation adjustments			Unrealized holding gains on securities			Defined benefit pension plans			Total
Beginning balance, January 1, 2013	$	(8.7	)	$	204.1		$	(5.9	)	$	189.5
Other comprehensive income before reclassifications		0.0			(41.7	)		0.0			(41.7	)
Amounts reclassified from accumulated other comprehensive income		(1.9	)		(10.3	)		0.0			(12.2	)
Net current-period other comprehensive income		(1.9	)		(52.0	)		0.0			(53.9	)
Ending balance, June 30, 2013	$	(10.6	)	$	152.1		$	(5.9	)	$	135.6

Amounts Reclassified from Accumulated Other Comprehensive Income

The amounts reclassified from accumulated other comprehensive income shown in the above table have been included in the following captions in the Consolidated Statement of Income:

(in millions)	For the Three Months Ended June 30, 2013			For the Six Months Ended June 30, 2013
Unrealized gains and losses on securities
Net realized investment gains	$	(14.3	)	$	(15.0	)
Provision for income taxes		4.8			4.7
Net of taxes	$	(9.5	)	$	(10.3	)

XML

Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Net Income Per Common Share on Basic and Diluted Basis

The following table presents the calculation of net income per common share on a basic and diluted basis for the three and six months ended June 30, 2013 and 2012 (all balances have been adjusted to reflect the effects of the 10% stock dividend):

	For the Three Months				For the Six Months
	Ended June 30,				Ended June 30,
(in millions, except number of shares and per share amounts)	2013		2012		2013		2012
Net income	$	31.7	$	24.0	$	64.4	$	43.6
Weighted average common shares outstanding - basic		26,962,397		28,254,520		27,103,917		28,525,400
Effect of dilutive securities
Equity compensation awards		1,047,193		424,960		978,628		380,174
Weighted average common shares outstanding - diluted		28,009,590		28,679,480		28,082,545		28,905,574
Net income per common share - basic	$	1.18	$	0.85	$	2.37	$	1.53
Net income per common share - diluted	$	1.13	$	0.84	$	2.29	$	1.51

XML

Shareholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended		6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Open Market [Member]	Jun. 30, 2013 Open Market [Member]	Feb. 18, 2011 2007 Repurchase Authorization [Member]	Feb. 18, 2011 2011 Repurchase Authorization [Member]	Jun. 30, 2013 2011 Repurchase Authorization [Member]
Equity [Line Items]
Dividend payable, date declared				May 07, 2013
Dividend payable, Date	Jun. 17, 2013		Jun. 15, 2012	Jun. 17, 2013
Percentage of stock dividend declared				10.00%
Stock dividend, additional shares issued				2,447,839
Dividend payable, date of record	Jun. 03, 2013		Jun. 01, 2012
Dividend declared per common share	$ 0.15		$ 0.12	$ 0.30	$ 0.24
Cash dividends paid - common shares, total	$ 4.1		$ 3.1	$ 7.8	$ 6.2
Common stock repurchase authorization, maximum								150.0	150.0
Common shares repurchased	427,751					184,430	282,030			7,313,792
Common stock repurchased, average cost per share		$ 41.17		$ 42.26						$ 32.82
Common shares repurchased, total cost	17.8					11.8	11.6			240.0
Common stock repurchase authorization for future repurchases										$ 36.4

XML

Disclosures about Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Summary of Company's Financial Instruments Whose Carrying Amount Did Not Equal Fair Value

A summary of our financial instruments whose carrying value did not equal fair value at June 30, 2013 and December 31, 2012 is shown below:

	June 30, 2013				December 31, 2012
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Junior subordinated debentures	$	193.3	$	155.2	$	193.3	$	151.8
Senior unsecured fixed rate notes		143.8		141.2		143.8		143.2
Other indebtedness:
Floating rate loan stock		63.2		50.7		63.0		49.5
Note payable		0.8		0.6		0.8		0.6
	$	401.1	$	347.7	$	400.9	$	345.1

XML

Investments - Schedule of Aging of Unrealized Losses on Investments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	$ 1,111.6	$ 490.3
Unrealized Losses, Less Than One Year	55.6	17.0
Fair Value, One Year or Greater	7.1	28.2
Unrealized Losses, One Year or Greater	0.7	3.1
Fair Value, Total	1,118.7	518.5
Unrealized Losses, Total	56.3	20.1
Fixed maturities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	1,058.4	418.5
Unrealized Losses, Less Than One Year	45.9	7.7
Fair Value, One Year or Greater	7.1	21.9
Unrealized Losses, One Year or Greater	0.7	2.2
Fair Value, Total	1,065.5	440.4
Unrealized Losses, Total	46.6	9.9
Fixed maturities [Member] | U.S. Governments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	66.8	11.9
Unrealized Losses, Less Than One Year	0.6	0
Fair Value, One Year or Greater	0	0
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	66.8	11.9
Unrealized Losses, Total	0.6	0
Fixed maturities [Member] | Non-US Governments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	40.0	8.5
Unrealized Losses, Less Than One Year	2.9	0.1
Fair Value, One Year or Greater	0.2	0.5
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	40.2	9.0
Unrealized Losses, Total	2.9	0.1
Fixed maturities [Member] | Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	220.1	28.2
Unrealized Losses, Less Than One Year	12.0	0.3
Fair Value, One Year or Greater	0	0.8
Unrealized Losses, One Year or Greater	0	0.2
Fair Value, Total	220.1	29.0
Unrealized Losses, Total	12.0	0.5
Fixed maturities [Member] | Credit-Financial [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	116.8	25.0
Unrealized Losses, Less Than One Year	3.6	0.2
Fair Value, One Year or Greater	1.5	8.6
Unrealized Losses, One Year or Greater	0.1	0.5
Fair Value, Total	118.3	33.6
Unrealized Losses, Total	3.7	0.7
Fixed maturities [Member] | Credit-Industrial [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	123.6	32.2
Unrealized Losses, Less Than One Year	5.3	0.4
Fair Value, One Year or Greater	0.1	3.0
Unrealized Losses, One Year or Greater	0.1	0.3
Fair Value, Total	123.7	35.2
Unrealized Losses, Total	5.4	0.7
Fixed maturities [Member] | Credit-Utility [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	46.5	8.4
Unrealized Losses, Less Than One Year	1.9	0.2
Fair Value, One Year or Greater	0	0.8
Unrealized Losses, One Year or Greater	0	0.2
Fair Value, Total	46.5	9.2
Unrealized Losses, Total	1.9	0.4
Fixed maturities [Member] | CMO/MBS-agency [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	80.2	26.4
Unrealized Losses, Less Than One Year	2.7	0.2
Fair Value, One Year or Greater	0.7	0.3
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	80.9	26.7
Unrealized Losses, Total	2.7	0.2
Fixed maturities [Member] | CMO/MBS-non agency [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year		1.7
Unrealized Losses, Less Than One Year		0.2
Fair Value, One Year or Greater		0
Unrealized Losses, One Year or Greater		0
Fair Value, Total		1.7
Unrealized Losses, Total		0.2
Fixed maturities [Member] | CMBS [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	31.2	5.7
Unrealized Losses, Less Than One Year	1.5	0
Fair Value, One Year or Greater	0	3.5
Unrealized Losses, One Year or Greater	0	0.2
Fair Value, Total	31.2	9.2
Unrealized Losses, Total	1.5	0.2
Fixed maturities [Member] | ABS-residential [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	0	0
Unrealized Losses, Less Than One Year	0	0
Fair Value, One Year or Greater	4.6	3.9
Unrealized Losses, One Year or Greater	0.5	0.8
Fair Value, Total	4.6	3.9
Unrealized Losses, Total	0.5	0.8
Fixed maturities [Member] | ABS-non residential [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	49.3	13.7
Unrealized Losses, Less Than One Year	0.3	0
Fair Value, One Year or Greater	0	0.2
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	49.3	13.9
Unrealized Losses, Total	0.3	0
Fixed maturities [Member] | Foreign denominated: Governments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	173.2	180.5
Unrealized Losses, Less Than One Year	9.0	4.3
Fair Value, One Year or Greater	0	0.3
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	173.2	180.8
Unrealized Losses, Total	9.0	4.3
Fixed maturities [Member] | Foreign Denominated: Credit [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	110.7	76.3
Unrealized Losses, Less Than One Year	6.1	1.8
Fair Value, One Year or Greater	0	0
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	110.7	76.3
Unrealized Losses, Total	6.1	1.8
Equity securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	58.0	60.2
Unrealized Losses, Less Than One Year	4.7	4.2
Fair Value, One Year or Greater	0	6.3
Unrealized Losses, One Year or Greater	0	0.9
Fair Value, Total	58.0	66.5
Unrealized Losses, Total	4.7	5.1
Other investments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	(4.8)	11.6
Unrealized Losses, Less Than One Year	4.8	5.0
Fair Value, One Year or Greater	0	0
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	(4.8)	11.6
Unrealized Losses, Total	4.8	5.0
Short-term investments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	0	0
Unrealized Losses, Less Than One Year	0.2	0.1
Fair Value, One Year or Greater	0	0
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	0	0
Unrealized Losses, Total	$ 0.2	$ 0.1

XML

Net Income Per Common Share - Net Income Per Common Share on Basic and Diluted Basis (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 31.7	$ 24.0	$ 64.4	$ 43.6
Weighted average common shares outstanding-basic	26,962,397	25,684,818	27,103,917	25,931,114
Effect of dilutive securities
Equity compensation awards	1,047,193	424,960	978,628	380,174
Weighted average common shares outstanding - diluted	28,009,590	26,071,147	28,082,545	26,276,728
Net income per common share - basic	$ 1.18	$ 0.93	$ 2.37	$ 1.68
Net income per common share - diluted	$ 1.13	$ 0.92	$ 2.29	$ 1.66

XML

Underwriting, Acquisition and Insurance Expenses (Tables)

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Underwriting, Acquisition and Insurance Expenses

Underwriting, acquisition and insurance expenses for the three and six months ended June 30, 2013 and 2012 were as follows:

	For the Three Months					For the Six Months
	Ended June 30,					Ended June 30,
(in millions)	2013		2012			2013		2012
Commissions	$	0.0	$	51.3		$	0.0	$	100.7
General expenses		0.0		61.5			0.0		122.0
Premium taxes, boards and bureaus		0.0		6.0			0.0		12.1
		0.0		118.8			0.0		234.8
Net (deferral) amortization of policy acquisition costs		0.0		(4.2	)		0.0		(6.5	)
Total underwriting, acquisition and insurance expenses	$	0.0	$	114.6		$	0.0	$	228.3

XML

Share-based Compensation - Summary of Non-Vested Shares Activity Under Amended Plan (Detail) (Amended Plan [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Amended Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	210,097
Granted, Shares	0
Exercised, shares	(90,368)
Expired or forfeited, Shares	(38,415)
Shares, Outstanding at June 30, 2013	81,314
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 33.13
Granted, Weighted-Average Exercise Price	$ 0.00
Exercised, Weighted-Average Exercise Price	$ 29.04
Expired or forfeited, Weighted-Average Exercise Price	$ 48.71
Weighted-Average Exercise Price, Outstanding at June 30, 2013	$ 30.33

XML

Segment Information - Identifiable Assets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Identifiable Assets [Line Items]
Identifiable assets	$ 6,575.30	$ 6,688.90
Excess and Surplus Lines [Member]
Identifiable Assets [Line Items]
Identifiable assets	2,223.00	2,206.70
Commercial Specialty [Member]
Identifiable Assets [Line Items]
Identifiable assets	1,327.60	1,337.70
International Specialty [Member]
Identifiable Assets [Line Items]
Identifiable assets	773.80	731.80
Syndicate 1200 [Member]
Identifiable Assets [Line Items]
Identifiable assets	1,667.80	1,811.40
Run-Off Lines [Member]
Identifiable Assets [Line Items]
Identifiable assets	521.90	516.50
Corporate and Other [Member]
Identifiable Assets [Line Items]
Identifiable assets	$ 61.20	$ 84.80

XML

Share-based Compensation - Summary of Option Activity Under Amended Plan (Detail) (Cash-Settled SARs Activity [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Cash-Settled SARs Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	1,886,124
Granted, Shares	556,598
Exercised, shares	(292,189)
Expired or forfeited, Shares	(119,178)
Shares, Outstanding at June 30, 2013	2,031,355
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 27.35
Granted, Weighted-Average Exercise Price	$ 37.00
Exercised, Weighted-Average Exercise Price	$ 28.85
Expired or forfeited, Weighted-Average Exercise Price	$ 25.62
Weighted-Average Exercise Price, Outstanding at June 30, 2013	$ 30.15

XML

Investments - Securities and Letters of Credit Pledged to Lloyd's as Company's Corporate Member's Capital (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Investments Debt And Equity Securities [Abstract]
Letters of credit	$ 124.9
Fixed maturities, at fair value	154.6
Short-term investments, at fair value	0.1
Total securities and letters of credit pledged to Lloyd's	$ 279.6

XML

Underwriting, Acquisition and Insurance Expenses - Additional Information (Detail) (Cash-Settled SARs Activity [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Cash-Settled SARs Activity [Member]
Underwriting Acquisition and Insurance Expense [Line Items]
Expense associated with cash settled stock appreciation rights	$ 4.5	$ 11.0

XML

Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Schedule of Repurchase of Shares

In 2013, we repurchased shares under Securities Exchange Act of 1934 Rule 10b5-1 trading plans as follows:

Date Trading Plan Initiated	2013 Purchase Period	Number of Shares Repurchased	Average Price of Shares Repurchased		Total Cost (in millions)		Repurchase Authorization Year
12/14/2012	01/01/13-01/17/13 (1)	171,480	$	35.41	$	6.0	2011
03/15/2013	03/16/13-05/01/13 (2)	205,452	$	40.75	$	8.3	2011
06/14/2013	06/18/13-07/31/13 (3)	195,217	$	43.47	$	8.5	2011

⁽¹⁾  The above table only reflects the 2013 activity under this Rule 10b5-1 trading plan. In 2012, 117,663 shares were repurchased under this Rule 10b5-1 trading plan for a total cost of $3.9 million. Total shares repurchased in 2012 and 2013 under this Rule 10b5-1 trading plan are 289,143 shares at an average price of $34.58 for a total cost of $9.9 million.

⁽²⁾  Through March 31, 2013, 56,745 shares were repurchased at an average price of $41.17 for a total cost of $2.3 million.

⁽³⁾  Through June 30, 2013, 94,614 shares were repurchased at an average price of $42.26 for a total cost of $4.0 million.

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 64.4	$ 43.6
Adjustments to reconcile net income to net cash used by operating activities:
Amortization and depreciation	18.7	16.3
Share-based payments expense	14.6	4.0
Deferred income tax provision, net	6.0	4.0
Net realized investment gains	(20.5)	(10.4)
Loss on disposals of fixed assets, net	0	0.2
Change in:
Accrued investment income	2.9	1.4
Receivables	(17.7)	45.5
Deferred acquisition costs	(12.0)	(3.2)
Ceded unearned premiums	(47.2)	(35.7)
Reserves for losses and loss adjustment expenses	12.1	(78.8)
Unearned premiums	81.3	73.1
Ceded reinsurance payable and funds held	(192.5)	(82.8)
Income taxes	4.0	(10.4)
Accrued underwriting expenses	8.0	4.2
Other, net	(18.3)	0.6
Cash used by operating activities	(96.2)	(28.4)
Cash flows from investing activities:
Sales of fixed maturity investments	874.7	727.8
Maturities and mandatory calls of fixed maturity investments	210.9	205.9
Sales of equity securities	39.4	5.5
Sales of other investments	5.8	2.3
Purchases of fixed maturity investments	(833.1)	(781.8)
Purchases of equity securities	(64.4)	(73.6)
Purchases of other investments	(28.8)	(11.2)
Change in foreign regulatory deposits and voluntary pools	0.7	(13.0)
Change in short-term investments	(49.2)	(3.2)
Settlements of foreign currency exchange forward contracts	(2.7)	(0.8)
Purchases of fixed assets	(13.0)	(19.2)
Other, net	(0.4)	(0.3)
Cash provided (used) by investing activities	139.9	38.4
Cash flows from financing activities:
Activity under stock incentive plans	1.5	0.2
Repurchase of Company's common shares	(30.9)	(27.8)
Payment of cash dividend to common shareholders	(7.8)	(6.2)
Cash used by financing activities	(37.2)	(33.8)
Effect of exchange rate changes on cash	(0.3)	(1.3)
Change in cash	6.2	(25.1)
Cash, beginning of period	95.8	100.9
Cash, end of period	$ 102.0	$ 75.8

XML

Recently Issued Accounting Standards

6 Months Ended

Jun. 30, 2013

Accounting Changes And Error Corrections [Abstract]

Recently Issued Accounting Standards

2. Recently Issued Accounting Standards

In December 2011, with further clarification issued in January 2013, the Financial Accounting Standards Board (“FASB”) issued an accounting update requiring disclosures about offsetting and related arrangements to enable users of financial statements to understand the effect of those arrangements on its financial position. Entities are required to disclose both gross information and net information about both instruments and transactions eligible for offset in the statement of financial position and instruments and transactions subject to an agreement similar to a master netting arrangement. This update is applicable to derivatives including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements and securities borrowing and securities lending arrangements. The update was effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. The disclosures required by this update should be provided retrospectively for all comparative periods presented. The adoption of this update did not have an impact on our financial results and disclosures.

In July 2012, the FASB issued an accounting update that allows an entity the option to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired. The more-likely-than-not threshold is defined as having a likelihood of more than 50 percent. If the more-likely-than-not threshold is met, an entity is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount in accordance with accounting guidance. The update was effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption was permitted, including for annual and interim impairment tests performed as of a date before July 27, 2012, if an entity’s financial statements for the most recent annual or interim period have not yet been issued or, for nonpublic entities, have not yet been made available for issuance.

In February 2013, the FASB issued an accounting update to improve the reporting of reclassifications out of accumulated other comprehensive income. An entity is required to report the effect of significant reclassifications, by component, out of accumulated other comprehensive income on the respective line items in net income if the item is required under GAAP to be reclassified in its entirety in the same reporting period. The required disclosures of the update are allowed either in the Statement of Income or in the notes. The amendments in the update were effective for reporting periods beginning after December 15, 2012. See Note 6, “Accumulated Other Comprehensive Income” for the required disclosures.

In February 2013, the FASB issued amendments to “Liabilities” (Topic 405) in order to resolve diversity in practice related to accounting for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. The amendments require an entity to measure the liability as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors, and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. The amendments in this update are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, but early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented for those obligations resulting from joint and several liability arrangements within the update’s scope that exist at the beginning of an entity’s fiscal year of adoption. We do not anticipate this update will have an impact on our financial results and disclosures.

In March 2013, the FASB issued an amendment to “Consolidation” (Topic 810) to resolve the diversity in practice related to the release of the cumulative translation adjustment into net income when a parent sells a part of all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The amendments in the update are effective prospectively for fiscal years, and interim reporting periods within those years, beginning after December 15, 2013, but early adoption is permitted. The amendments should be applied prospectively to derecognition events occurring after the effective date with no adjustment to prior periods. We do not anticipate this update will have an impact on our financial results and disclosures.

XML

Net Income Per Common Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Net Income Per Common Share

5. Net Income Per Common Share

The following table presents the calculation of net income per common share on a basic and diluted basis for the three and six months ended June 30, 2013 and 2012 (all balances have been adjusted to reflect the effects of the 10% stock dividend):

	For the Three Months				For the Six Months
	Ended June 30,				Ended June 30,
(in millions, except number of shares and per share amounts)	2013		2012		2013		2012
Net income	$	31.7	$	24.0	$	64.4	$	43.6
Weighted average common shares outstanding - basic		26,962,397		28,254,520		27,103,917		28,525,400
Effect of dilutive securities
Equity compensation awards		1,047,193		424,960		978,628		380,174
Weighted average common shares outstanding - diluted		28,009,590		28,679,480		28,082,545		28,905,574
Net income per common share - basic	$	1.18	$	0.85	$	2.37	$	1.53
Net income per common share - diluted	$	1.13	$	0.84	$	2.29	$	1.51

Excluded from the weighted average common shares outstanding calculation at June 30, 2013 and 2012 are 7,213,189 shares and 5,912,227 shares, respectively, which are held as treasury shares. The shares are excluded as of their repurchase date. For the three and six months ended June 30, 2013, equity compensation awards to purchase 22,604 shares of common stock were excluded from the computation of diluted net income per common share as these instruments were anti-dilutive. These instruments expire at varying times from 2013 through 2020. For the three and six months ended June 30, 2012, equity compensation awards to purchase 1,314,243 shares of common stock were excluded from the computation of diluted net income per common share as these instruments were anti-dilutive. These instruments expire at varying times from 2013 through 2019.

XML

Segment Information - Additional Information (Detail) (Syndicate 1200 [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Syndicate 1200 [Member]
Segment Reporting Information [Line Items]
Assets associated with trade capital providers	$ 0	$ 505.7

XML

Investments

6 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Investments

3. Investments

Composition of Invested Assets

The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investments as of June 30, 2013 and December 31, 2012 were as follows:

June 30, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	302.1	$	3.8	$	0.6	$	305.3
Non-U.S. Governments		58.0		0.4		2.9		55.5
Obligations of states and political subdivisions		641.1		26.6		12.0		655.7
Credit-Financial		368.1		14.5		3.7		378.9
Credit-Industrial		389.1		16.4		5.4		400.1
Credit-Utility		174.7		6.3		1.9		179.1
Structured securities:
CMO/MBS-agency (1)		289.3		11.1		2.7		297.7
CMO/MBS-non agency		9.5		0.9		0.0		10.4
CMBS (2)		107.6		3.6		1.5		109.7
ABS-residential (3)		8.6		0.2		0.5		8.3
ABS-non residential		80.7		0.6		0.3		81.0
Foreign denominated:
Governments		202.0		1.8		9.0		194.8
Credit		122.1		2.1		6.1		118.1
Total fixed maturities		2,752.9		88.3		46.6		2,794.6
Equity securities		414.1		190.3		4.7		599.7
Other investments		313.7		2.7		4.8		311.6
Short-term investments		279.7		0.0		0.2		279.5
Total investments	$	3,760.4	$	281.3	$	56.3	$	3,985.4
December 31, 2012	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	401.1	$	9.3	$	0.0	$	410.4
Non-U.S. Governments		53.1		3.6		0.1		56.6
Obligations of states and political subdivisions		551.7		44.9		0.5		596.1
Credit-Financial		382.4		25.7		0.7		407.4
Credit-Industrial		428.4		31.1		0.7		458.8
Credit-Utility		189.9		12.6		0.4		202.1
Structured securities:
CMO/MBS-agency (1)		375.1		20.2		0.2		395.1
CMO/MBS-non agency		12.5		1.0		0.2		13.3
CMBS (2)		109.5		5.7		0.2		115.0
ABS-residential (3)		10.1		0.2		0.8		9.5
ABS-non residential		81.3		1.2		0.0		82.5
Foreign denominated:
Governments		262.1		9.2		4.3		267.0
Credit		135.9		6.1		1.8		140.2
Total fixed maturities		2,993.1		170.8		9.9		3,154.0
Equity securities		383.5		153.0		5.1		531.4
Other investments		284.8		1.2		5.0		281.0
Short-term investments		234.3		0.1		0.1		234.3
Total investments	$	3,895.7	$	325.1	$	20.1	$	4,200.7

⁽¹⁾ Collateralized mortgage obligations/mortgage-backed securities (“CMO/MBS”).

⁽²⁾ Commercial mortgage-backed securities (“CMBS”).

⁽³⁾ Asset-backed securities (“ABS”).

Included in total investments at June 30, 2013 and December 31, 2012 is $89.2 million and $143.9 million, respectively, of assets, at fair value, managed on behalf of the trade capital providers, who are third party capital participants that provide underwriting capital to our Syndicate 1200 segment.

Contractual Maturity

The amortized cost and fair values of fixed maturity investments as of June 30, 2013, by contractual maturity, were as follows:

(in millions)	Amortized Cost		Fair Value
Due in one year or less	$	203.5	$	204.6
Due after one year through five years		1,041.7		1,052.8
Due after five years through ten years		727.0		750.0
Thereafter		285.0		280.1
Structured securities		495.7		507.1
Total	$	2,752.9	$	2,794.6

The expected maturities may differ from the contractual maturities because debtors may have the right to call or prepay obligations.

Unrealized Losses and Other-Than-Temporary Impairments

An aging of unrealized losses on our investments at June 30, 2013 and December 31, 2012 is presented below:

June 30, 2013	Less Than One Year					One Year or Greater				Total
(in millions)	Fair Value			Unrealized Losses		Fair Value		Unrealized Losses		Fair Value			Unrealized Losses
Fixed maturities
USD denominated:
U.S. Governments	$	66.8		$	0.6	$	0.0	$	0.0	$	66.8		$	0.6
Non-U.S. Governments (1)		40.0			2.9		0.2		0.0		40.2			2.9
Obligations of states and political subdivisions		220.1			12.0		0.0		0.0		220.1			12.0
Credit-Financial		116.8			3.6		1.5		0.1		118.3			3.7
Credit-Industrial		123.6			5.3		0.1		0.1		123.7			5.4
Credit-Utility		46.5			1.9		0.0		0.0		46.5			1.9
Structured securities:
CMO/MBS-agency (1)		80.2			2.7		0.7		0.0		80.9			2.7
CMBS		31.2			1.5		0.0		0.0		31.2			1.5
ABS-residential		0.0			0.0		4.6		0.5		4.6			0.5
ABS-non residential		49.3			0.3		0.0		0.0		49.3			0.3
Foreign denominated:
Governments		173.2			9.0		0.0		0.0		173.2			9.0
Credit		110.7			6.1		0.0		0.0		110.7			6.1
Total fixed maturities		1,058.4			45.9		7.1		0.7		1,065.5			46.6
Equity securities		58.0			4.7		0.0		0.0		58.0			4.7
Other investments		(4.8	)		4.8		0.0		0.0		(4.8	)		4.8
Short-term investments		0.0			0.2		0.0		0.0		0.0			0.2
Total	$	1,111.6		$	55.6	$	7.1	$	0.7	$	1,118.7		$	56.3

⁽¹⁾  Unrealized losses one year or greater are less than $0.1 million.

December 31, 2012	Less Than One Year				One Year or Greater				Total
(in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Fixed maturities
USD denominated:
U.S. Governments (1)	$	11.9	$	0.0	$	0.0	$	0.0	$	11.9	$	0.0
Non-U.S. Governments (2)		8.5		0.1		0.5		0.0		9.0		0.1
Obligations of states and political subdivisions		28.2		0.3		0.8		0.2		29.0		0.5
Credit-Financial		25.0		0.2		8.6		0.5		33.6		0.7
Credit-Industrial		32.2		0.4		3.0		0.3		35.2		0.7
Credit-Utility		8.4		0.2		0.8		0.2		9.2		0.4
Structured securities:
CMO/MBS-agency (2)		26.4		0.2		0.3		0.0		26.7		0.2
CMO/MBS-non agency		1.7		0.2		0.0		0.0		1.7		0.2
CMBS (1)		5.7		0.0		3.5		0.2		9.2		0.2
ABS-residential		0.0		0.0		3.9		0.8		3.9		0.8
ABS-non residential (1) (2)		13.7		0.0		0.2		0.0		13.9		0.0
Foreign denominated:
Governments (2)		180.5		4.3		0.3		0.0		180.8		4.3
Credit		76.3		1.8		0.0		0.0		76.3		1.8
Total fixed maturities		418.5		7.7		21.9		2.2		440.4		9.9
Equity securities		60.2		4.2		6.3		0.9		66.5		5.1
Other investments		11.6		5.0		0.0		0.0		11.6		5.0
Short-term investments		0.0		0.1		0.0		0.0		0.0		0.1
Total	$	490.3	$	17.0	$	28.2	$	3.1	$	518.5	$	20.1

⁽¹⁾  Unrealized losses less than one year are less than $0.1 million.

⁽²⁾  Unrealized losses one year or greater are less than $0.1 million.

We hold a total of 6,413 securities, of which 2,160 were in an unrealized loss position for less than one year and 18 were in an unrealized loss position for a period one year or greater as of June 30, 2013. Unrealized losses greater than twelve months on fixed maturities were the result of a number of factors, including increased credit spreads, foreign currency fluctuations, and higher market yields relative to the date the securities were purchased, and for structured securities, by the performance of the underlying collateral as well. We also considered that we do not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be maturity. We do not consider these investments to be other-than-temporarily impaired at June 30, 2013.

We regularly evaluate our investments for impairment. For fixed maturity securities, the evaluation for a credit loss is generally based on the present value of expected cash flows of the security as compared to the amortized book value. For MBS and residential ABS securities, frequency and severity of loss inputs are used in projecting future cash flows of the securities. Loss frequency is measured as the credit default rate, which includes such factors as loan-to-value ratios and credit scores of borrowers. Loss severity includes such factors as trends in overall housing prices and house prices that are obtained at foreclosure. We recognized other-than-temporary losses on our fixed maturities portfolio of $0.3 million and $0.3 million for the three and six months ended June 30, 2013, respectively. We recognized other-than-temporary losses on our fixed maturities portfolio of $0.3 million and $0.3 million for the three and six months ended June 30, 2012, respectively. For equity securities and other investments, the length of time and the amount of decline in fair value are the principal factors in determining other-than-temporary impairment. We recognized other-than-temporary losses on our equity portfolio of $0.1 million and $1.5 million for the three and six months ended June 30, 2013, respectively. We recognized other-than-temporary losses on our equity portfolio of $0.5 million and $0.6 million for the three and six months ended June 30, 2012, respectively. We recognized other-than-temporary losses on our other investments of $0.0 and $3.4 million for the three and six months ended June 30, 2013. We did not recognize any other-than-temporary losses on our other investments in 2012. In situations where we did not recognize other-than-temporary losses on investments in our equity portfolio, we have evaluated the near-term prospects of the investment in relation to the severity and duration of the impairment and based on that evaluation have the ability and intent to hold these investments until a recovery of fair value.

Realized Gains and Losses

The following table presents the Company’s gross realized investment gains (losses) for the three and six months ended June 30:

(in millions)	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Realized gains
Fixed maturities	$	10.2		$	7.2		$	21.7		$	15.5
Equity securities		7.2			0.2			7.7			0.2
Other investments		6.5			1.6			17.6			13.1
Short-term investments		0.0			0.1			0.1			0.3
Gross realized gains		23.9			9.1			47.1			29.1
Realized losses
Fixed maturities		(1.9	)		(2.2	)		(8.4	)		(5.1	)
Equity securities		(0.7	)		(0.2	)		(0.7	)		(0.3	)
Other investments		(9.8	)		(8.3	)		(12.1	)		(12.1	)
Short-term investments		(0.1	)		(0.3	)		(0.2	)		(0.3	)
Other-than-temporary impairment losses on fixed maturities		(0.3	)		(0.3	)		(0.3	)		(0.3	)
Other-than-temporary impairment losses on equity securities		(0.1	)		(0.5	)		(1.5	)		(0.6	)
Other-than-temporary impairment losses on other investments		0.0			0.0			(3.4	)		0.0
Gross realized losses		(12.9	)		(11.8	)		(26.6	)		(18.7	)
Net realized investment (losses) gains	$	11.0		$	(2.7	)	$	20.5		$	10.4

We enter into short-term, currency spot and forward contracts to mitigate foreign exchange rate exposure for certain non-U.S. Dollar denominated fixed maturity investments. The forward contracts used are typically less than sixty days and are renewed, as long as the non-U.S. Dollar denominated fixed maturity investments are held in our portfolio. These forward contracts are designated as fair value hedges for accounting purposes.

Foreign exchange long positions offset by foreign exchange forward contracts resulted in realized losses of less than $0.1 million for the three and six months ended June 30, 2013, respectively and $0.2 million and $0.2 million for the three and six months ended June 30, 2012, respectively, and are reflected in realized gains and losses in the Consolidated Statements of Income and in the table above. As of June 30, 2013 and 2012, we hedged $2.0 million and $2.3 million, respectively, of certain holdings in non-U.S. Dollar denominated fixed maturity investments with $1.9 million and $2.3 million, respectively, of foreign exchange contracts.

We also enter into foreign currency exchange forward contracts to manage currency exposure on losses related to global catastrophe events. These currency forward contracts are carried at fair value in the Consolidated Balance Sheets in “Other investments”. The realized and unrealized gains and losses are included in realized gains or losses in the Consolidated Statements of Income. The notional amount of the currency forward contracts was $68.2 million and $113.2 million as of June 30, 2013 and 2012, respectively. The fair value of the currency forward contracts was a loss of $4.8 million and a loss of $0.4 million as of June 30, 2013 and 2012, respectively. For the three and six months ended June 30, 2013 and 2012, we recognized $3.9 million and $4.6 million in net realized losses and $0.5 million and $3.9 million in net realized gains, respectively, from the currency forward contracts.

Regulatory Deposits, Pledged Securities and Letters of Credit

At June 30, 2013, the amortized cost and fair value of investments on deposit for regulatory purposes and reinsurance were $212.9 million and $221.9 million, respectively.

Investments with an amortized cost of $245.7 million and fair value of $247.9 million were pledged as collateral in support of irrevocable letters of credit at June 30, 2013. These assets support irrevocable letters of credit issued under the terms of certain reinsurance agreements in respect of reported loss and loss expense reserves in the amount of $68.4 million and $124.9 million for our Corporate member’s capital as security to support the underwriting business at Lloyd’s.

At June 30, 2013, our Corporate member’s capital supporting our Lloyd’s business consisted of:

Letters of credit	$	124.9
Fixed maturities, at fair value		154.6
Short-term investments, at fair value		0.1
Total securities and letters of credit pledged to Lloyd’s	$	279.6

Fair Value Measurements

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability, or in the absence of a principal market, the most advantageous market. Market participants are buyers and sellers in the principal (or most advantageous) market that are independent, knowledgeable, able to transact for the asset or liability and willing to transfer the asset or liability.

Valuation techniques consistent with the market approach, income approach and/or cost approach are used to measure fair value. The inputs of these valuation techniques are categorized into three levels.

• Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that can be accessed at the reporting date. We define actively traded as a security that has traded in the past seven days. We receive one quote per instrument for Level 1 inputs.

• Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. We receive one quote per instrument for Level 2 inputs.

• Level 3 inputs are unobservable inputs. Unobservable inputs reflect our own assumptions about the assumptions market participants would use in pricing the asset or liability based on the best information available in the circumstances.

We receive fair value prices from third-party pricing services and our outside investment managers. These prices are determined using observable market information such as dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things. We have reviewed the processes used by the third-party providers for pricing the securities, and have determined that these processes result in fair values consistent with GAAP requirements. In addition, we review these prices for reasonableness, and have not adjusted any prices received from the third-party providers as of June 30, 2013. A description of the valuation techniques we use to measure assets at fair value is as follows:

Fixed Maturities (Available-for-Sale) Levels 1 and 2:

• United States Treasury securities are typically valued using Level 1 inputs. For these securities, we obtain fair value measurements from third-party pricing services using quoted prices (unadjusted) in active markets at the reporting date.

• United States Government agencies, non-U.S. Government securities, obligations of states and political subdivisions, credit securities and foreign denominated securities are reported at fair value using Level 2 inputs. For these securities, we obtain fair value measurements from third-party pricing services. Observable data may include dealer quotes, market spreads, yield curves, live trading levels, trade execution data, credit information and the security’s terms and conditions, among other things.

• CMO/MBS agency securities are reported at fair value using Level 2 inputs. For these securities, we obtain fair value measurements from third-party pricing services. Observable data may include dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things.

• CMO/MBS non-agency, CMBS, ABS residential, and ABS non-residential securities are reported at fair value using Level 2 inputs. For these securities, we obtain fair value measurements from third-party pricing services. Observable data may include dealer quotes, market spreads, cash flows, yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things.

Fixed Maturities (Available-for-Sale) Level 3:

• Corporate securities reported at fair value using Level 3 inputs in 2012 were infrequently traded securities valued by an independent investment manager using unobservable inputs. These securities were sold in 2012.

Equity Securities Level 1: Equity securities are principally reported at fair value using Level 1 inputs. For these securities, we obtain fair value measurements from a third party pricing service using quoted prices (unadjusted) in active markets at the reporting date.

Equity Securities Level 2: We own interests in mutual funds that are reported at fair value using Level 2 inputs. The valuations are based on the funds’ net asset value per share, determined weekly or at the end of each month. The underlying assets in the funds are valued primarily on the basis of closing market quotations or official closing prices on each valuation day.

Equity Securities Level 3: We own certain equity securities that are reported at fair value using Level 3 inputs. The valuation techniques for these securities include the following:

• Fair value measurements are obtained from the National Association of Insurance Commissioners’ Security Valuation Office at the reporting date.

• Fair value measurements for an investment in an equity fund obtained by applying final prices provided by the administrator of the fund, which is based upon certain estimates and assumptions.

Other Investments Level 2: Foreign regulatory deposits are assets held in trust in jurisdictions where there is a legal and regulatory requirement to maintain funds locally in order to protect policyholders. Lloyd’s is the appointed investment manager for the funds. These assets are invested in short term government securities, agency securities and corporate bonds and are valued using Level 2 inputs based upon values obtained from Lloyd’s. Foreign currency future contracts are valued by our counterparty using market driven foreign currency exchange rates and are considered Level 2 investments.

Short-term Investments: Short-term investments are principally reported at fair value using Level 1 inputs, with the exception of short-term corporate bonds reported at fair value using Level 2 inputs as described in the fixed maturities section above. Values for the investments categorized as Level 1 are obtained from various financial institutions as of the reporting date.

Other Assets Level 3: We have one reinsurance contract deemed a derivative in 2013 and two reinsurance contracts deemed derivatives in 2012. The fair values were estimated by management taking into account changes in the market for catastrophic bond reinsurance contracts with similar economic characteristics and potential recoveries from events preceding the valuation date. See Note 11 “Derivative Instruments” for related disclosures.

Transfers Between Level 1 and Level 2 Securities: There were no transfers between Level 1 and Level 2 securities during the three or six months ended June 30, 2013.

Based on an analysis of the inputs, our financial assets measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012 have been categorized as follows:

(in millions)	June 30, 2013		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	305.3	$	143.0	$	162.3	$	0.0
Non-U.S. Governments		55.5		0.0		55.5		0.0
Obligations of states and political subdivisions		655.7		0.0		655.7		0.0
Credit-Financial		378.9		0.0		378.9		0.0
Credit-Industrial		400.1		0.0		400.1		0.0
Credit-Utility		179.1		0.0		179.1		0.0
Structured securities:
CMO/MBS-agency		297.7		0.0		297.7		0.0
CMO/MBS-non agency		10.4		0.0		10.4		0.0
CMBS		109.7		0.0		109.7		0.0
ABS-residential		8.3		0.0		8.3		0.0
ABS-non residential		81.0		0.0		81.0		0.0
Foreign denominated:
Governments		194.8		0.0		194.8		0.0
Credit		118.1		0.0		118.1		0.0
Total fixed maturities		2,794.6		143.0		2,651.6		0.0
Equity securities		599.7		515.5		82.3		1.9
Other investments		126.4		0.0		126.4		0.0
Short-term investments		279.5		255.3		24.2		0.0
Other assets		3.3		0.0		0.0		3.3
	$	3,803.5	$	913.8	$	2,884.5	$	5.2

^(a)  Quoted prices in active markets for identical assets

^(b)  Significant other observable inputs

^(c)  Significant unobservable inputs

(in millions)	December 31, 2012		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	410.4	$	219.5	$	190.9	$	0.0
Non-U.S. Governments		56.6		0.0		56.6		0.0
Obligations of states and political subdivisions		596.1		0.0		596.1		0.0
Credit-Financial		407.4		0.0		407.4		0.0
Credit-Industrial		458.8		0.0		458.8		0.0
Credit-Utility		202.1		0.0		202.1		0.0
Structured securities:
CMO/MBS-agency		395.1		0.0		395.1		0.0
CMO/MBS-non agency		13.3		0.0		13.3		0.0
CMBS		115.0		0.0		115.0		0.0
ABS-residential		9.5		0.0		9.5		0.0
ABS-non residential		82.5		0.0		82.5		0.0
Foreign denominated:
Governments		267.0		0.0		267.0		0.0
Credit		140.2		0.0		140.2		0.0
Total fixed maturities		3,154.0		219.5		2,934.5		0.0
Equity securities		531.4		469.0		60.6		1.8
Other investments		132.0		0.0		132.0		0.0
Short-term investments		234.3		201.1		33.2		0.0
Other assets		6.9		0.0		0.0		6.9
	$	4,058.6	$	889.6	$	3,160.3	$	8.7

^(a)  Quoted prices in active markets for identical assets

^(b)  Significant other observable inputs

^(c)  Significant unobservable inputs

The fair value measurements in the tables above do not agree to “Total investments” on the Consolidated Balance Sheets as they exclude certain other investments that are accounted for under the equity-method of accounting and include reinsurance contracts that are classified as Other assets.

A reconciliation of the beginning and ending balances for the investments categorized as Level 3 at June 30, 2013 and December 31, 2012 are as follows:

Fair Value Measurements Using Unobservable Inputs (Level 3)

(in millions)	Equity Securities		Other Assets			Total
Beginning balance, January 1, 2013	$	1.8	$	6.9		$	8.7
Transfers into Level 3		0.0		0.0			0.0
Transfers out of Level 3		0.0		0.0			0.0
Total gains or losses (realized/unrealized):
Included in net income		0.0		0.0			0.0
Included in other comprehensive income		0.1		0.0			0.1
Purchases, issuances, sales, and settlements
Purchases		0.0		0.0			0.0
Issuances		0.0		0.0			0.0
Sales		0.0		0.0			0.0
Settlements		0.0		(3.6	)		(3.6	)
Ending balance, June 30, 2013	$	1.9	$	3.3		$	5.2
Amount of total gains or losses for the period included in net income attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2013	$	0.0	$	0.0		$	0.0

Fair Value Measurements Using Unobservable Inputs (Level 3)

(in millions)	Credit Financial			Equity Securities			Other Assets			Total
Beginning balance, January 1, 2012	$	0.7		$	2.4		$	9.0		$	12.1
Transfers into Level 3		0.0			0.0			0.0			0.0
Transfers out of Level 3		0.0			0.0			0.0			0.0
Total gains or losses (realized/unrealized):
Included in net income		0.1			0.0			0.0			0.1
Included in other comprehensive income		0.0			0.0			0.0			0.0
Purchases, issuances, sales, and settlements
Purchases		0.0			0.0			0.0			0.0
Issuances		0.0			0.0			0.0			0.0
Sales		(0.8	)		(0.6	)		0.0			(1.4	)
Settlements		0.0			0.0			(2.1	)		(2.1	)
Ending balance, December 31, 2012	$	0.0		$	1.8		$	6.9		$	8.7
Amount of total gains or losses for the period included in net loss attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2012	$	0.0		$	0.0		$	0.0		$	0.0

At June 30, 2013 and December 31, 2012, we did not have any financial assets or financial liabilities measured at fair value on a nonrecurring basis or any financial liabilities on a recurring basis.

XML

Investments - Schedule of Aging of Unrealized Losses on Investments (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Unrealized losses one year or greater	$ 0.1	$ 0.1
Unrealized losses less than one year		$ 0.1

XML

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Tax Provision (Benefit)

Our income tax provision includes the following components:

	For the Three Months Ended June 30,					For the Six Months Ended June 30,
(in millions)	2013		2012			2013		2012
Current tax provision	$	8.1	$	1.9		$	9.9	$	5.5
Deferred tax provision related to:
Future tax deductions		2.0		(1.5	)		4.4		2.9
Valuation allowance change		1.0		0.6			1.6		1.1
Income tax provision	$	11.1	$	1.0		$	15.9	$	9.5

Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates

For the three and six months ended June 30, 2013 and 2012, pre-tax income (loss) attributable to our operations and the operations’ effective tax rates were as follows:

	For the Three Months Ended June 30,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	3.9			0.0	%	$	9.9			0.0	%
United States		31.5			26.7	%		8.3			9.7	%
United Kingdom		10.7			25.9	%		9.0			0.7	%
Belgium		0.0	(1)		-39.0	%		0.0	(1)		138.3	%
Brazil		(2.9	)		0.0	%		(1.9	)		-1.1	%
Dubai		0.0			0.0	%		0.1			0.0	%
Ireland		0.0			0.0	%		0.0			0.0	%
Malta		(0.4	)		0.0	%		(0.4	)		0.0	%
Switzerland		0.0	(1)		22.2	%		0.0	(1)		22.3	%
Pre-tax income (loss)	$	42.8					$	25.0

(1) Pre-tax income for the respective period was less than $0.1 million.

	For the Six Months Ended June 30,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	20.0			0.0	%	$	10.2			0.0	%
United States		49.0			23.7	%		33.7			23.4	%
United Kingdom		16.7			25.8	%		13.7			11.0	%
Belgium		0.0	(1)		-35.3	%		0.1			50.5	%
Brazil		(4.7	)		0.0	%		(3.5	)		0.0	%
Dubai		0.0			0.0	%		0.1			0.0	%
Ireland		0.0			0.0	%		(0.1	)		0.0	%
Malta		(0.7	)		0.0	%		(1.1	)		0.0	%
Switzerland		0.0	(1)		19.6	%		0.0	(1)		23.9	%
Pre-tax income (loss)	$	80.3					$	53.1

(2) Pre-tax income for the respective period was less than $0.1 million.

Reconciliation of Difference Between Provision for Income Taxes and Expected Tax Provision at Weighted Average Tax Rate

A reconciliation of the difference between the provision for income taxes and the expected tax provision at the weighted average tax rate for the three and six months ended June 30, 2013 and 2012 is as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Income tax provision at expected rate	$	12.3		$	4.4		$	19.0		$	13.7
Tax effect of:
Tax-exempt interest		(1.4	)		(1.6	)		(2.8	)		(3.0	)
Dividends received deduction		(0.5	)		(0.5	)		(1.1	)		(0.9	)
Valuation allowance change		1.0			0.6			1.6			1.1
Other permanent adjustments, net		0.0			0.2			(0.9	)		0.7
Adjustment for annualized rate		(0.8	)		0.2			(0.4	)		0.0
United States state tax benefit		(0.1	)		(0.1	)		(0.3	)		(0.2	)
Other foreign adjustments		0.0			0.1			0.0			0.1
Foreign exchange adjustments		0.2			(2.3	)		0.4			(2.0	)
Foreign withholding taxes		0.4			0.0			0.4			0.0
Income tax provision	$	11.1		$	1.0		$	15.9		$	9.5
Income tax provision - Foreign	$	2.7		$	0.2		$	4.3		$	1.6
Income tax provision - United States Federal		8.2			1.1			11.7			8.3
Income tax benefit - United States State		(0.2	)		(0.3	)		(0.5	)		(0.4	)
Foreign withholding tax - United States		0.4			0.0			0.4			0.0
Income tax provision	$	11.1		$	1.0		$	15.9		$	9.5

XML

Segment Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Revenue and (Loss) Income Before Income Taxes for Each Segment

Revenue and income (loss) before income taxes for each segment for the three and six months ended June 30, 2013 and 2012 were as follows:

	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Revenue:
Earned premiums
Excess and Surplus Lines	$	108.7		$	98.5		$	213.8		$	194.7
Commercial Specialty		75.3			81.2			150.5			163.2
International Specialty		36.4			29.4			69.1			57.4
Syndicate 1200		107.4			80.4			198.3			151.5
Run-off Lines		(0.3	)		0.7			0.0			0.7
Total earned premiums		327.5			290.2			631.7			567.5
Net investment income
Excess and Surplus Lines		11.2			13.0			22.1			26.0
Commercial Specialty		6.1			7.0			12.0			13.9
International Specialty		1.7			2.8			4.0			6.9
Syndicate 1200		2.8			3.7			5.6			7.6
Run-off Lines		2.8			3.5			5.6			7.0
Corporate and Other		0.7			0.0			3.9			0.0
Total net investment income		25.3			30.0			53.2			61.4
Fee income, net		0.2			0.5			0.2			1.8
Net realized investment gains (losses)		11.0			(2.7	)		20.5			10.4
Total revenue	$	364.0		$	318.0		$	705.6		$	641.1
	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Income (loss) before income taxes
Excess and Surplus Lines	$	16.7		$	22.3		$	30.6		$	41.2
Commercial Specialty		1.5			(8.8	)		7.2			(9.1	)
International Specialty		2.8			9.6			7.6			15.4
Syndicate 1200		9.8			4.5			18.2			6.2
Run-off Lines		3.7			1.4			3.3			1.0
Total segment income before taxes		34.5			29.0			66.9			54.7
Corporate and Other		(2.7	)		(1.3	)		(7.1	)		(12.0	)
Net realized investment gains (losses)		11.0			(2.7	)		20.5			10.4
Total income before income taxes	$	42.8		$	25.0		$	80.3		$	53.1

Schedule of Earned Premiums by Geographic Location

The table below presents earned premiums by geographic location for the three and six months ended June 30, 2013 and 2012. For this disclosure, we determine geographic location by the country of domicile of our subsidiaries that write the business and not by the location of insureds or reinsureds from whom the business was generated.

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(in millions)	2013		2012		2013		2012
Bermuda	$	22.1	$	28.6	$	47.9	$	50.9
Brazil		10.0		5.2		20.0		11.7
Malta		0.4		0.1		0.8		0.1
United Kingdom		111.3		75.9		198.3		146.2
United States		183.7		180.4		364.7		358.6
Total earned premiums	$	327.5	$	290.2	$	631.7	$	567.5

Identifiable Assets

The following table represents identifiable assets as of June 30, 2013 and December 31, 2012:

(in millions)	June 30, 2013		December 31, 2012
Excess and Surplus Lines	$	2,223.0	$	2,206.7
Commercial Specialty		1,327.6		1,337.7
International Specialty		773.8		731.8
Syndicate 1200		1,667.8		1,811.4
Run-off Lines		521.9		516.5
Corporate and Other		61.2		84.8
Total	$	6,575.3	$	6,688.9

XML

Segment Information - Schedule of Earned Premiums by Geographic Location (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Total earned premiums	$ 327.5	$ 290.2	$ 631.7	$ 567.5
Bermuda [Member]
Segment Reporting Information [Line Items]
Total earned premiums	22.1	28.6	47.9	50.9
Brazil [Member]
Segment Reporting Information [Line Items]
Total earned premiums	10.0	5.2	20.0	11.7
Malta [Member]
Segment Reporting Information [Line Items]
Total earned premiums	0.4	0.1	0.8	0.1
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total earned premiums	111.3	75.9	198.3	146.2
United States [Member]
Segment Reporting Information [Line Items]
Total earned premiums	$ 183.7	$ 180.4	$ 364.7	$ 358.6

XML

Investments - Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Investments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 3,760.4	$ 3,895.7
Gross Unrealized Gains	281.3	325.1
Gross Unrealized Losses	56.3	20.1
Fair Value	3,985.4	4,200.7
Fixed maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,752.9	2,993.1
Gross Unrealized Gains	88.3	170.8
Gross Unrealized Losses	46.6	9.9
Fair Value	2,794.6	3,154.0
Fixed maturities [Member] | U.S. Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	302.1	401.1
Gross Unrealized Gains	3.8	9.3
Gross Unrealized Losses	0.6	0
Fair Value	305.3	410.4
Fixed maturities [Member] | Non-U.S. Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	58.0	53.1
Gross Unrealized Gains	0.4	3.6
Gross Unrealized Losses	2.9	0.1
Fair Value	55.5	56.6
Fixed maturities [Member] | Obligations of states and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	641.1	551.7
Gross Unrealized Gains	26.6	44.9
Gross Unrealized Losses	12.0	0.5
Fair Value	655.7	596.1
Fixed maturities [Member] | Credit-Financial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	368.1	382.4
Gross Unrealized Gains	14.5	25.7
Gross Unrealized Losses	3.7	0.7
Fair Value	378.9	407.4
Fixed maturities [Member] | Credit-Industrial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	389.1	428.4
Gross Unrealized Gains	16.4	31.1
Gross Unrealized Losses	5.4	0.7
Fair Value	400.1	458.8
Fixed maturities [Member] | Credit-Utility [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	174.7	189.9
Gross Unrealized Gains	6.3	12.6
Gross Unrealized Losses	1.9	0.4
Fair Value	179.1	202.1
Fixed maturities [Member] | CMO/MBS-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	289.3	375.1
Gross Unrealized Gains	11.1	20.2
Gross Unrealized Losses	2.7	0.2
Fair Value	297.7	395.1
Fixed maturities [Member] | CMO/MBS-non agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9.5	12.5
Gross Unrealized Gains	0.9	1.0
Gross Unrealized Losses	0	0.2
Fair Value	10.4	13.3
Fixed maturities [Member] | CMBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	107.6	109.5
Gross Unrealized Gains	3.6	5.7
Gross Unrealized Losses	1.5	0.2
Fair Value	109.7	115.0
Fixed maturities [Member] | ABS-residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8.6	10.1
Gross Unrealized Gains	0.2	0.2
Gross Unrealized Losses	0.5	0.8
Fair Value	8.3	9.5
Fixed maturities [Member] | ABS-non residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	80.7	81.3
Gross Unrealized Gains	0.6	1.2
Gross Unrealized Losses	0.3	0
Fair Value	81.0	82.5
Fixed maturities [Member] | Foreign denominated: Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	202.0	262.1
Gross Unrealized Gains	1.8	9.2
Gross Unrealized Losses	9.0	4.3
Fair Value	194.8	267.0
Fixed maturities [Member] | Foreign Denominated: Credit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	122.1	135.9
Gross Unrealized Gains	2.1	6.1
Gross Unrealized Losses	6.1	1.8
Fair Value	118.1	140.2
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	414.1	383.5
Gross Unrealized Gains	190.3	153.0
Gross Unrealized Losses	4.7	5.1
Fair Value	599.7	531.4
Other investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	313.7	284.8
Gross Unrealized Gains	2.7	1.2
Gross Unrealized Losses	4.8	5.0
Fair Value	311.6	281.0
Short-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	279.7	234.3
Gross Unrealized Gains	0	0.1
Gross Unrealized Losses	0.2	0.1
Fair Value	$ 279.5	$ 234.3

XML

Segment Information - Revenue and (Loss) Income Before Income Taxes for Each Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Earned premiums	$ 327.5	$ 290.2	$ 631.7	$ 567.5
Net investment income	25.3	30.0	53.2	61.4
Fee income, net	0.2	0.5	0.2	1.8
Total segment income before taxes	34.5	29.0	66.9	54.7
Net realized investment gains (losses)	11.0	(2.7)	20.5	10.4
Total revenue	364.0	318.0	705.6	641.1
Net realized investment gains (losses)	11.0	(2.7)	20.5	10.4
Total income before income taxes	42.8	25.0	80.3	53.1
Excess and Surplus Lines [Member]
Segment Reporting Information [Line Items]
Earned premiums	108.7	98.5	213.8	194.7
Net investment income	11.2	13.0	22.1	26.0
Total segment income before taxes	16.7	22.3	30.6	41.2
Commercial Specialty [Member]
Segment Reporting Information [Line Items]
Earned premiums	75.3	81.2	150.5	163.2
Net investment income	6.1	7.0	12.0	13.9
Total segment income before taxes	1.5	(8.8)	7.2	(9.1)
International Specialty [Member]
Segment Reporting Information [Line Items]
Earned premiums	36.4	29.4	69.1	57.4
Net investment income	1.7	2.8	4.0	6.9
Total segment income before taxes	2.8	9.6	7.6	15.4
Syndicate 1200 [Member]
Segment Reporting Information [Line Items]
Earned premiums	107.4	80.4	198.3	151.5
Net investment income	2.8	3.7	5.6	7.6
Total segment income before taxes	9.8	4.5	18.2	6.2
Run-Off Lines [Member]
Segment Reporting Information [Line Items]
Earned premiums	(0.3)	0.7	0	0.7
Net investment income	2.8	3.5	5.6	7.0
Total segment income before taxes	3.7	1.4	3.3	1.0
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net investment income	0.7	0	3.9	0
Net realized investment gains (losses)	(2.7)	(1.3)	(7.1)	(12.0)
Net realized investment gains (losses)	$ (2.7)	$ (1.3)	$ (7.1)	$ (12.0)

XML

Income Taxes - Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Examination [Line Items]
Pre-tax income (loss)	$ 42.8	$ 25.0	$ 80.3	$ 53.1
Maximum [Member] | Switzerland [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)		$ 0.1		$ 0.1

XML

Net Income Per Common Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Earnings Per Share [Abstract]
Treasury shares	7,213,189	5,912,227	7,213,189	5,912,227	6,459,613
Antidilutive securities excluded from computation of diluted net income per share, shares	22,604	1,314,243	22,604	1,314,243

XML

Investments - Schedule of Reconciliation of Beginning and Ending Balances for Investments Categorized as Level 3 (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 8.7	$ 12.1
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	0.1
Included in other comprehensive income	0.1	0
Purchases	0	0
Issuances	0	0
Sales	0	(1.4)
Settlements	(3.6)	(2.1)
Ending balance	5.2	8.7
Amount of total gains or losses for the period included in net income attributable to the change in unrealized gains or losses relating to assets still held at end of period	0	0
Equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	1.8	2.4
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	0
Included in other comprehensive income	0.1	0
Purchases	0	0
Issuances	0	0
Sales	0	(0.6)
Settlements	0	0
Ending balance	1.9	1.8
Amount of total gains or losses for the period included in net income attributable to the change in unrealized gains or losses relating to assets still held at end of period	0	0
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	6.9	9.0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Included in net income	0	0
Included in other comprehensive income	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	(3.6)	(2.1)
Ending balance	3.3	6.9
Amount of total gains or losses for the period included in net income attributable to the change in unrealized gains or losses relating to assets still held at end of period	0	0
Credit Financial [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		0.7
Transfers into Level 3		0
Transfers out of Level 3		0
Included in net income		0.1
Included in other comprehensive income		0
Purchases		0
Issuances		0
Sales		(0.8)
Settlements		0
Ending balance		0
Amount of total gains or losses for the period included in net income attributable to the change in unrealized gains or losses relating to assets still held at end of period		$ 0

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Available-for-sale cost	$ 2,752.9	$ 2,993.1
Equity securities cost	414.1	383.5
Other investments cost	313.7	284.8
Short-term investments, Cost	$ 279.7	$ 234.3
Common shares, par value	$ 1.00	$ 1.00
Common shares, shares authorized	500,000,000	500,000,000
Common shares, shares issued	33,970,108	31,384,271
Treasury shares, shares	7,213,189	6,459,613

XML

Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

8. Income Taxes

We are incorporated under the laws of Bermuda and, under current Bermuda law, are not obligated to pay any taxes in Bermuda based upon income or capital gains. We have received an undertaking from the Supervisor of Insurance in Bermuda pursuant to the provisions of the Exempted Undertakings Tax Protection Act, 2011, which exempts us from any Bermuda taxes computed on profits, income or any capital asset, gain or appreciation, or any tax in the nature of estate duty or inheritance tax, at least until the year 2035.

We do not consider ourselves to be engaged in a trade or business in the United States or the United Kingdom and, accordingly, do not expect to be subject to direct United States or United Kingdom income taxation.

We have subsidiaries based in the United Kingdom that are subject to the tax laws of that country. Under current law, these subsidiaries are taxed at the applicable corporate tax rates. Six of the United Kingdom subsidiaries are deemed to be engaged in business in the United States and are therefore subject to United States corporate tax in respect of a proportion of their United States underwriting business only. Relief is available against the United Kingdom tax liabilities in respect of overseas taxes paid that arise from the underwriting business. Corporate income tax losses incurred in the United Kingdom can be carried forward, for application against future income, indefinitely. Our United Kingdom subsidiaries file separate United Kingdom income tax returns.

We have subsidiaries based in the United States that are subject to the tax laws of that country. Under current law, these subsidiaries are taxed at the applicable corporate tax rates. Our United States subsidiaries file a consolidated United States federal income tax return.

We also have operations in Belgium, Switzerland, Brazil, France, Malta, Spain and Ireland, which also are subject to income taxes imposed by the jurisdiction in which they operate. We have operations in the United Arab Emirates, which are not subject to income tax under the laws of that country.

Our income tax provision includes the following components:

	For the Three Months Ended June 30,					For the Six Months Ended June 30,
(in millions)	2013		2012			2013		2012
Current tax provision	$	8.1	$	1.9		$	9.9	$	5.5
Deferred tax provision related to:
Future tax deductions		2.0		(1.5	)		4.4		2.9
Valuation allowance change		1.0		0.6			1.6		1.1
Income tax provision	$	11.1	$	1.0		$	15.9	$	9.5

Our expected income tax provision computed on pre-tax income (loss) at the weighted average tax rate has been calculated as the sum of the pre-tax income (loss) in each jurisdiction multiplied by that jurisdiction’s applicable statutory tax rate. For the three and six months ended June 30, 2013 and 2012, pre-tax income (loss) attributable to our operations and the operations’ effective tax rates were as follows:

	For the Three Months Ended June 30,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	3.9			0.0	%	$	9.9			0.0	%
United States		31.5			26.7	%		8.3			9.7	%
United Kingdom		10.7			25.9	%		9.0			0.7	%
Belgium		0.0	(1)		-39.0	%		0.0	(1)		138.3	%
Brazil		(2.9	)		0.0	%		(1.9	)		-1.1	%
Dubai		0.0			0.0	%		0.1			0.0	%
Ireland		0.0			0.0	%		0.0			0.0	%
Malta		(0.4	)		0.0	%		(0.4	)		0.0	%
Switzerland		0.0	(1)		22.2	%		0.0	(1)		22.3	%
Pre-tax income (loss)	$	42.8					$	25.0

(1) Pre-tax income for the respective period was less than $0.1 million.

	For the Six Months Ended June 30,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	20.0			0.0	%	$	10.2			0.0	%
United States		49.0			23.7	%		33.7			23.4	%
United Kingdom		16.7			25.8	%		13.7			11.0	%
Belgium		0.0	(1)		-35.3	%		0.1			50.5	%
Brazil		(4.7	)		0.0	%		(3.5	)		0.0	%
Dubai		0.0			0.0	%		0.1			0.0	%
Ireland		0.0			0.0	%		(0.1	)		0.0	%
Malta		(0.7	)		0.0	%		(1.1	)		0.0	%
Switzerland		0.0	(1)		19.6	%		0.0	(1)		23.9	%
Pre-tax income (loss)	$	80.3					$	53.1

(2) Pre-tax income for the respective period was less than $0.1 million.

A reconciliation of the difference between the provision for income taxes and the expected tax provision at the weighted average tax rate for the three and six months ended June 30, 2013 and 2012 is as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
(in millions)	2013			2012			2013			2012
Income tax provision at expected rate	$	12.3		$	4.4		$	19.0		$	13.7
Tax effect of:
Tax-exempt interest		(1.4	)		(1.6	)		(2.8	)		(3.0	)
Dividends received deduction		(0.5	)		(0.5	)		(1.1	)		(0.9	)
Valuation allowance change		1.0			0.6			1.6			1.1
Other permanent adjustments, net		0.0			0.2			(0.9	)		0.7
Adjustment for annualized rate		(0.8	)		0.2			(0.4	)		0.0
United States state tax benefit		(0.1	)		(0.1	)		(0.3	)		(0.2	)
Other foreign adjustments		0.0			0.1			0.0			0.1
Foreign exchange adjustments		0.2			(2.3	)		0.4			(2.0	)
Foreign withholding taxes		0.4			0.0			0.4			0.0
Income tax provision	$	11.1		$	1.0		$	15.9		$	9.5
Income tax provision - Foreign	$	2.7		$	0.2		$	4.3		$	1.6
Income tax provision - United States Federal		8.2			1.1			11.7			8.3
Income tax benefit - United States State		(0.2	)		(0.3	)		(0.5	)		(0.4	)
Foreign withholding tax - United States		0.4			0.0			0.4			0.0
Income tax provision	$	11.1		$	1.0		$	15.9		$	9.5

Our net deferred tax assets (liabilities) are supported by taxes paid in previous periods, the reversal of the taxable temporary differences and the recognition of future income. Management regularly evaluates the recoverability of the deferred tax assets and makes any necessary adjustments to them based upon any changes in management’s expectations of future taxable income. Realization of deferred tax assets is dependent upon our generation of sufficient taxable income in the future to recover tax benefits that cannot be recovered from taxes paid in the carryback period, which is generally two years for net operating losses and three years for capital losses for our operations in the United States. At June 30, 2013, we had a total net deferred tax asset of $25.1 million prior to any valuation allowance. Management has concluded that a valuation allowance is required for a portion of the tax effected net capital loss carryforward of $30.2 million generated from the sale of PXRE Reinsurance Company, and a full valuation allowance is required for the tax effected net operating loss carryforward of $18.7 million from PXRE Corporation and for the tax effected net operating loss carryforward of $1.0 million from ARIS Title Insurance Corporation (“ARIS”). The capital loss carryforward generated from the sale of PXRE Reinsurance Company will expire if not utilized by December 31, 2013. Of the PXRE Corporation loss carryforwards, $17.2 million will expire if not utilized by December 31, 2025 and $1.5 million will expire if not utilized by December 31, 2027. The valuation allowances have been established as Internal Revenue Code Section 382 limits the application of net operating loss and net capital loss carryforwards following an ownership change. Accordingly, a valuation allowance of $54.1 million is required as of June 30, 2013. The loss carryforwards available per year are $2.8 million as required by Internal Revenue Code Section 382. For the six months ended June 30, 2013, the valuation allowance was reduced by $0.5 million pertaining to the use of the PXRE and ARIS loss carryforwards, was increased by $0.3 million pertaining to the Malta operations and was increased by $1.8 million pertaining to the Brazil operations.

We had no material unrecognized tax benefits as of June 30, 2013. Our United States subsidiaries are no longer subject to U.S. federal and state income tax examinations by tax authorities for years before 2009. Our United Kingdom subsidiaries are no longer subject to United Kingdom income tax examinations by Her Majesty’s Revenue and Customs for years before 2011.

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 31.7	$ 24.0	$ 64.4	$ 43.6
Other comprehensive (loss) income:
Foreign currency translation adjustments	(1.9)	(4.4)	(1.9)	(3.3)
Defined benefit pension plan:
Net loss arising during the period	0	(0.3)	0	(0.3)
Net loss arising during the period	0	(0.9)	0	(0.9)
Unrealized gains (losses) on securities:
Gains (losses) arising during the period	(82.2)	(10.1)	(58.0)	42.3
Reclassification adjustment for gains included in net income	(14.3)	(4.0)	(15.0)	(9.4)
Other comprehensive income (loss) before tax	(98.4)	(19.4)	(74.9)	28.7
Defined benefit pension plan:
Net loss arising during the period	0	(0.3)	0	(0.3)
Net loss arising during the period	0	(0.9)	0	(0.9)
Unrealized gains (losses) on securities:
Gains (losses) arising during the period	(26.7)	(0.1)	(16.3)	14.1
Reclassification adjustment for gains included in net income	(4.8)	(1.2)	(4.7)	(2.8)
Income tax provision related to other comprehensive income (loss)	(31.5)	(1.6)	(21.0)	11.0
Other comprehensive (loss) income, net of tax	(66.9)	(17.8)	(53.9)	17.7
Comprehensive (loss) income	$ (35.2)	$ 6.2	$ 10.5	$ 61.3

XML

Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended					6 Months Ended									6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Maximum [Member]	Jun. 30, 2012 2007 Plan [Member]	Nov. 30, 2007 2007 Plan [Member]	Jun. 30, 2013 2007 Plan [Member] Maximum [Member]	Jun. 30, 2012 2007 Plan [Member] Maximum [Member]	Jun. 30, 2013 2007 Plan [Member] Minimum [Member]	Jun. 30, 2012 2007 Plan [Member] Minimum [Member]	Jun. 30, 2013 Cash-Settled SARs Activity [Member]	Jun. 30, 2012 Cash-Settled SARs Activity [Member]	Jun. 30, 2013 Cash-Settled SARs Activity [Member] Maximum [Member]	Jun. 30, 2013 Cash-Settled SARs Activity [Member] Minimum [Member]	Jun. 30, 2013 Amended Plan [Member]	Jun. 30, 2013 Restricted Share Units [Member]	Jun. 30, 2012 Restricted Share Units [Member]	Jun. 30, 2013 Restricted Share Units [Member] Maximum [Member]	Jun. 30, 2013 Restricted Share Units [Member] Minimum [Member]	Jun. 30, 2013 Stock-Settled SARs Activity [Member]	Jun. 30, 2012 Stock-Settled SARs Activity [Member]	Jun. 30, 2013 Stock-Settled SARs Activity [Member] Maximum [Member]	Jun. 30, 2013 Stock-Settled SARs Activity [Member] Minimum [Member]	Jun. 30, 2013 Deferred Compensation Plan [Member]	Jun. 30, 2012 Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period, maximum, years						5 years	5 years	1 year				4 years	1 year				4 years	2 years			4 years	1 year
Rate of stock dividend need to reflect after adjusting outstanding awards	10.00%
Percentage increase in number of shares outstanding	10.00%
Percentage of reduction in exercise price	9.09%
Share-based compensation arrangement by share-based payment award, number of shares authorized					4,500,000									6,250,000
Share-based compensation arrangement by share-based payment award, terms of award	Share options and SARs will count as one share for the purposes of the limits under the 2007 Plan; restricted shares, restricted share units, performance units, performance shares or other share-based incentive awards which settle in common shares will count as 2.75 shares for purpose of the limits under the 2007 Plan.
Count of restricted shares, settle in common shares	2.75
Term of shares options, (in years)			seven years
Share-based compensation arrangement by share-based payment award, compensation expense				$ 0.5											$ 1.6	$ 0.8			$ 1.3	$ 1.2
Employee service share-based compensation, unrecognized compensation costs on nonvested awards										14.0					7.9				5.6
Deferred compensation arrangement with individual, compensation expense										$ 11.0	$ 1.0												$ 1.2	$ 0.5
Deferred compensation arrangement with individual, description		Under the Directors Plan, non-employee directors can elect each year to defer payment of 50% or 100% of their cash compensation payable during the next calendar year.
Deferred compensation arrangement with individual, employer contribution percentage		75.00%
Deferred compensation arrangement with individual, interest rate				two percent above the prime rate
Share-based compensation arrangement by share-based payment award, discount from market price							100.00%		50.00%
Deferred compensation arrangement with individual, distributions period, months	6 months
Deferred compensation arrangement with individual, shares authorized for issuance	1,650

XML

CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Available-for-sale (cost: 2013 - $2,752.9; 2012 - $2,993.1)	$ 2,794.6	$ 3,154.0
Equity securities, at fair value (cost: 2013 - $414.1; 2012 - $383.5)	599.7	531.4
Other investments (cost: 2013 - $313.7; 2012 - $284.8)	311.6	281.0
Short-term investments, at fair value (cost: 2013 - $279.7; 2012 - $234.3)	279.5	234.3
Total investments	3,985.4	4,200.7
Cash	102.0	95.8
Accrued investment income	27.4	30.3
Premiums receivable	448.6	361.0
Reinsurance recoverables	1,249.7	1,320.9
Goodwill	153.8	153.8
Intangible assets, net of accumulated amortization	88.7	91.5
Current income taxes receivable, net	8.9	12.9
Deferred acquisition costs, net	111.9	99.4
Ceded unearned premiums	239.7	193.6
Other assets	159.2	129.0
Total assets	6,575.3	6,688.9
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	3,233.9	3,223.5
Unearned premiums	809.7	730.2
Accrued underwriting expenses	123.7	105.0
Ceded reinsurance payable, net	420.7	612.1
Funds held	32.0	33.7
Senior unsecured fixed rate notes	143.8	143.8
Other indebtedness	64.0	63.8
Junior subordinated debentures	193.3	193.3
Deferred tax liabilities, net	29.0	43.8
Other liabilities	34.1	25.6
Total liabilities	5,084.2	5,174.8
Shareholders' equity:
Common shares - $1.00 par, 500,000,000 shares authorized; 33,970,108 and 31,384,271 shares issued at June 30, 2013 and December 31, 2012, respectively	34.0	31.4
Additional paid-in capital	823.6	722.7
Treasury shares (7,213,189 and 6,459,613 shares at June 30, 2013 and December 31, 2012, respectively)	(235.6)	(205.5)
Retained earnings	733.5	776.0
Accumulated other comprehensive income, net of taxes	135.6	189.5
Total shareholders' equity	1,491.1	1,514.1
Total liabilities and shareholders' equity	$ 6,575.3	$ 6,688.9

XML

Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Beginning balance, Foreign currency translation adjustments			$ (8.7)
Other comprehensive income before reclassifications, Foreign currency translation adjustments			0
Amounts reclassified from accumulated other comprehensive income, Foreign currency translation adjustments			(1.9)
Net current-period other comprehensive income, Foreign currency translation adjustments			(1.9)
Ending balance, Foreign currency translation adjustments	(10.6)		(10.6)
Beginning balance, Unrealized holding gains on securities			204.1
Other comprehensive income before reclassifications, Unrealized holding gains on securities			(41.7)
Amounts reclassified from accumulated other comprehensive income, Unrealized holding gains on securities	(9.5)		(10.3)
Net current-period other comprehensive income, Unrealized holding gains on securities			(52.0)
Ending balance, Unrealized holding gains on securities	152.1		152.1
Beginning balance, Defined benefit pension plans			(5.9)
Other comprehensive income before reclassifications, Defined benefit pension plans			0
Amounts reclassified from accumulated other comprehensive income, Defined benefit pension plans			0
Net current-period other comprehensive income, Defined benefit pension plans			0
Ending balance, Defined benefit pension plans	(5.9)		(5.9)
Beginning balance			189.5
Other comprehensive income before reclassifications			(41.7)
Amounts reclassified from accumulated other comprehensive income			(12.2)
Other comprehensive (loss) income, net of tax	(66.9)	(17.8)	(53.9)	17.7
Ending balance	$ 135.6		$ 135.6

XML

Information Provided in Connection with Outstanding Debt of Subsidiaries - Condensed Consolidating Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Assets
Total Investments	$ 3,985.40	$ 4,200.70
Cash	102.0	95.8	75.8	100.9
Premiums receivable	448.6	361.0
Reinsurance recoverables	1,249.70	1,320.90
Goodwill and other intangible assets	242.5	245.3
Current income taxes receivable, net	8.9	12.9
Deferred acquisition costs, net	111.9	99.4
Ceded unearned premiums	239.7	193.6
Other assets	159.2	129.0
Due from affiliates	0	0
Intercompany note receivable	0	0
Investments in subsidiaries	0	0
Total assets	6,575.30	6,688.90
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	3,233.90	3,223.50
Unearned premiums	809.7	730.2
Funds held and ceded reinsurance payable, net	452.7	645.8
Long-term debt	401.1	400.9
Current income taxes payable, net	0	0
Deferred tax liabilities, net	29.0	43.8
Accrued underwriting expenses and other liabilities	157.8	130.6
Due to affiliates	0	0
Intercompany note payable	0	0
Total liabilities	5,084.20	5,174.80
Total shareholders' equity	1,491.10	1,514.10
Total liabilities and shareholders' equity	6,575.30	6,688.90
Argo Group International Holdings, Ltd (Parent Guarantor) [Member]
Assets
Total Investments	(3.80)	(0.90)
Cash	0	0	0	0
Premiums receivable	0	0
Reinsurance recoverables	0	0
Goodwill and other intangible assets	0	0
Current income taxes receivable, net	0	0
Deferred acquisition costs, net	0	0
Ceded unearned premiums	0	0
Other assets	5.8	4.3
Due from affiliates	0	5.0
Intercompany note receivable	0	0
Investments in subsidiaries	1,616.40	1,621.10
Total assets	1,618.40	1,629.50
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	0	0
Unearned premiums	0	0
Funds held and ceded reinsurance payable, net	0	0
Long-term debt	49.0	49.0
Current income taxes payable, net	0	0
Deferred tax liabilities, net	0	0
Accrued underwriting expenses and other liabilities	14.9	11.3
Due to affiliates	(6.1)	0
Intercompany note payable	69.5	55.1
Total liabilities	127.30	115.40
Total shareholders' equity	1,491.10	1,514.10
Total liabilities and shareholders' equity	1,618.40	1,629.50
Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer) [Member]
Assets
Total Investments	2,715.80	2,794.70
Cash	83.8	73.9	63.8	85.1
Premiums receivable	158.4	155.1
Reinsurance recoverables	1,179.30	1,155.10
Goodwill and other intangible assets	138.4	139.5
Current income taxes receivable, net	4.5	8.7
Deferred acquisition costs, net	54.0	54.6
Ceded unearned premiums	92.2	85.9
Other assets	115.2	104.0
Due from affiliates	1.6	1.2
Intercompany note receivable	121.1	119.6
Investments in subsidiaries	0	0
Total assets	4,664.30	4,692.30
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	2,209.60	2,226.30
Unearned premiums	422.0	415.6
Funds held and ceded reinsurance payable, net	617.9	598.4
Long-term debt	288.9	288.9
Current income taxes payable, net	0	0
Deferred tax liabilities, net	19.4	36.8
Accrued underwriting expenses and other liabilities	92.0	84.1
Due to affiliates	0	0
Intercompany note payable	0	0
Total liabilities	3,649.80	3,650.10
Total shareholders' equity	1,014.50	1,042.20
Total liabilities and shareholders' equity	4,664.30	4,692.30
Other Subsidiaries and Eliminations [Member]
Assets
Total Investments	1,273.40	1,406.90
Cash	18.2	21.9	12.0	15.8
Premiums receivable	290.2	205.9
Reinsurance recoverables	70.40	165.80
Goodwill and other intangible assets	104.1	105.8
Current income taxes receivable, net	4.4	4.2
Deferred acquisition costs, net	57.9	44.8
Ceded unearned premiums	147.5	107.7
Other assets	65.6	51.0
Due from affiliates	(1.6)	(1.2)
Intercompany note receivable	(121.1)	(119.6)
Investments in subsidiaries	0	0
Total assets	1,909.00	1,993.20
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	1,024.30	997.20
Unearned premiums	387.7	314.6
Funds held and ceded reinsurance payable, net	(165.2)	47.4
Long-term debt	63.2	63.0
Current income taxes payable, net	0	0
Deferred tax liabilities, net	9.6	7.0
Accrued underwriting expenses and other liabilities	50.9	35.2
Due to affiliates	0	0
Intercompany note payable	0	0
Total liabilities	1,370.50	1,464.40
Total shareholders' equity	538.50	528.80
Total liabilities and shareholders' equity	1,909.00	1,993.20
Consolidating Adjustments [Member]
Assets
Total Investments	0	0
Cash	0	0	0	0
Premiums receivable	0	0
Reinsurance recoverables	0	0
Goodwill and other intangible assets	0	0
Current income taxes receivable, net	0	0
Deferred acquisition costs, net	0	0
Ceded unearned premiums	0	0
Other assets	0	0
Due from affiliates	0	(5.0)
Intercompany note receivable	0	0
Investments in subsidiaries	(1,616.40)	(1,621.10)
Total assets	(1,616.40)	(1,626.10)
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	0	0
Unearned premiums	0	0
Funds held and ceded reinsurance payable, net	0	0
Long-term debt	0	0
Current income taxes payable, net	0	0
Deferred tax liabilities, net	0	0
Accrued underwriting expenses and other liabilities	0	0
Due to affiliates	6.1	0
Intercompany note payable	(69.5)	(55.1)
Total liabilities	(63.40)	(55.10)
Total shareholders' equity	(1,553.00)	(1,571.00)
Total liabilities and shareholders' equity	$ (1,616.40)	$ (1,626.10)

XML

Supplemental Cash Flow Information - Schedule of Interest Paid (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Interest Paid [Abstract]
Senior unsecured fixed rate notes	$ 4.7	$ 0
Junior subordinated debentures	3.8	9.4
Other indebtedness	0.5	1.6
Revolving credit facility	0	0
Total interest paid	$ 9.0	$ 11.0

XML

Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Assumptions

The expected award life is based upon the average holding period over the history of the incentive plan. The following table summarizes the assumptions we used for the six months ended June 30, 2013 and 2012: 

	2013			2012
Risk-free rate of return		1.45	%		1.09	%
Expected dividend yields		1.67	%		1.67	%
Expected award life (years)		5.02			5.03
Expected volatility		31.9	%		32.6	%

2007 Plan [Member]

Summary of Stock Option Activity

A summary of option activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		418,325		$	33.56
Granted		0		$	0.00
Exercised		(52,803	)	$	32.16
Expired or forfeited		(44,830	)	$	34.22
Outstanding at June 30, 2013		320,692		$	33.69

Summary of Restricted Share Units Activity Under 2007 Plan

A summary of restricted share activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		236,139		$	29.76
Granted		115,288		$	37.86
Vested and issued		(53,034	)	$	30.36
Expired or forfeited		(8,769	)	$	31.39
Outstanding at June 30, 2013		289,624		$	33.10

Summary of Stock-Settled SARs Activity Under 2007 Plan

A summary of stock-settled SARs activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,261,557		$	27.04
Granted		332,004		$	37.21
Exercised		(99,085	)	$	29.26
Expired or forfeited		(124,794	)	$	26.40
Outstanding at June 30, 2013		1,369,682		$	29.35

Summary of Cash-Settled SARs Activity Under 2007 Plan

A summary of cash-settled SARs activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,886,124		$	27.35
Granted		556,598		$	37.00
Exercised		(292,189	)	$	28.85
Expired or forfeited		(119,178	)	$	25.62
Outstanding at June 30, 2013		2,031,355		$	30.15

Amended Plan [Member]

Summary of Stock Option Activity

A summary of option activity under the Amended Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		210,097		$	33.13
Granted		0		$	0.00
Exercised		(90,368	)	$	29.04
Expired or forfeited		(38,415	)	$	48.71
Outstanding at June 30, 2013		81,314		$	30.33

XML

Recently Issued Accounting Standards (Policies)

6 Months Ended

Jun. 30, 2013

Accounting Changes And Error Corrections [Abstract]

Recently Issued Accounting Pronouncements

In December 2011, with further clarification issued in January 2013, the Financial Accounting Standards Board (“FASB”) issued an accounting update requiring disclosures about offsetting and related arrangements to enable users of financial statements to understand the effect of those arrangements on its financial position. Entities are required to disclose both gross information and net information about both instruments and transactions eligible for offset in the statement of financial position and instruments and transactions subject to an agreement similar to a master netting arrangement. This update is applicable to derivatives including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements and securities borrowing and securities lending arrangements. The update was effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. The disclosures required by this update should be provided retrospectively for all comparative periods presented. The adoption of this update did not have an impact on our financial results and disclosures.

In July 2012, the FASB issued an accounting update that allows an entity the option to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired. The more-likely-than-not threshold is defined as having a likelihood of more than 50 percent. If the more-likely-than-not threshold is met, an entity is required to determine the fair value of the indefinite-lived intangible asset and perform the quantitative impairment test by comparing the fair value with the carrying amount in accordance with accounting guidance. The update was effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption was permitted, including for annual and interim impairment tests performed as of a date before July 27, 2012, if an entity’s financial statements for the most recent annual or interim period have not yet been issued or, for nonpublic entities, have not yet been made available for issuance.

In February 2013, the FASB issued an accounting update to improve the reporting of reclassifications out of accumulated other comprehensive income. An entity is required to report the effect of significant reclassifications, by component, out of accumulated other comprehensive income on the respective line items in net income if the item is required under GAAP to be reclassified in its entirety in the same reporting period. The required disclosures of the update are allowed either in the Statement of Income or in the notes. The amendments in the update were effective for reporting periods beginning after December 15, 2012. See Note 6, “Accumulated Other Comprehensive Income” for the required disclosures.

In February 2013, the FASB issued amendments to “Liabilities” (Topic 405) in order to resolve diversity in practice related to accounting for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. The amendments require an entity to measure the liability as the sum of (a) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors, and (b) any additional amount the reporting entity expects to pay on behalf of its co-obligors. The amendments in this update are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, but early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented for those obligations resulting from joint and several liability arrangements within the update’s scope that exist at the beginning of an entity’s fiscal year of adoption. We do not anticipate this update will have an impact on our financial results and disclosures.

In March 2013, the FASB issued an amendment to “Consolidation” (Topic 810) to resolve the diversity in practice related to the release of the cumulative translation adjustment into net income when a parent sells a part of all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The amendments in the update are effective prospectively for fiscal years, and interim reporting periods within those years, beginning after December 15, 2013, but early adoption is permitted. The amendments should be applied prospectively to derecognition events occurring after the effective date with no adjustment to prior periods. We do not anticipate this update will have an impact on our financial results and disclosures.

XML

Investments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 3,985.4	$ 4,200.7
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3,803.5
Fixed maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,794.6	3,154.0
Fixed maturities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,794.6	3,154.0
Fixed maturities [Member] | U.S. Governments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	305.3	410.4
Fixed maturities [Member] | U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	305.3	410.4
Fixed maturities [Member] | Non-U.S. Governments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	55.5	56.6
Fixed maturities [Member] | Non-U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	55.5	56.6
Fixed maturities [Member] | Obligations of states and political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	655.7	596.1
Fixed maturities [Member] | Obligations of states and political subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	655.7	596.1
Fixed maturities [Member] | Credit-Financial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	378.9	407.4
Fixed maturities [Member] | Credit-Financial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	378.9	407.4
Fixed maturities [Member] | Credit-Industrial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	400.1	458.8
Fixed maturities [Member] | Credit-Industrial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	400.1	458.8
Fixed maturities [Member] | Credit-Utility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	179.1	202.1
Fixed maturities [Member] | Credit-Utility [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	179.1	202.1
Fixed maturities [Member] | CMO/MBS-agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	297.7	395.1
Fixed maturities [Member] | CMO/MBS-agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	297.7	395.1
Fixed maturities [Member] | CMO/MBS-non agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	10.4	13.3
Fixed maturities [Member] | CMO/MBS-non agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	10.4	13.3
Fixed maturities [Member] | CMBS [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	109.7	115.0
Fixed maturities [Member] | CMBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	109.7	115.0
Fixed maturities [Member] | ABS-residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	8.3	9.5
Fixed maturities [Member] | ABS-residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	8.3	9.5
Fixed maturities [Member] | ABS-non residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	81.0	82.5
Fixed maturities [Member] | ABS-non residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	81.0	82.5
Fixed maturities [Member] | Foreign denominated: Governments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	194.8	267.0
Fixed maturities [Member] | Foreign denominated: Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	194.8	267.0
Fixed maturities [Member] | Foreign Denominated: Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	118.1	140.2
Fixed maturities [Member] | Foreign Denominated: Credit [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	118.1	140.2
Equity securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	599.7	531.4
Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	599.7	531.4
Other investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	311.6	281.0
Other investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	126.4	132.0
Short-term investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	279.5	234.3
Short-term investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	279.5	234.3
Other Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3.3	6.9
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		889.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	913.8
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	143.0	219.5
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	143.0	219.5
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Non-U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Obligations of states and political subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Credit-Financial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Credit-Industrial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Credit-Utility [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | CMO/MBS-agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | CMO/MBS-non agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | CMBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | ABS-residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | ABS-non residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Foreign denominated: Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed maturities [Member] | Foreign Denominated: Credit [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	515.5	469.0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Other investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Short-term investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	255.3	201.1
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		3,160.3
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,884.5
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,651.6	2,934.5
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	162.3	190.9
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Non-U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	55.5	56.6
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Obligations of states and political subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	655.7	596.1
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Credit-Financial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	378.9	407.4
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Credit-Industrial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	400.1	458.8
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Credit-Utility [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	179.1	202.1
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | CMO/MBS-agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	297.7	395.1
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | CMO/MBS-non agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	10.4	13.3
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | CMBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	109.7	115.0
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | ABS-residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	8.3	9.5
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | ABS-non residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	81.0	82.5
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Foreign denominated: Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	194.8	267.0
Significant Other Observable Inputs (Level 2) [Member] | Fixed maturities [Member] | Foreign Denominated: Credit [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	118.1	140.2
Significant Other Observable Inputs (Level 2) [Member] | Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	82.3	60.6
Significant Other Observable Inputs (Level 2) [Member] | Other investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	126.4	132.0
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	24.2	33.2
Significant Other Observable Inputs (Level 2) [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		8.7
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	5.2
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Non-U.S. Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Obligations of states and political subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Credit-Financial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Credit-Industrial [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Credit-Utility [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | CMO/MBS-agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | CMO/MBS-non agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | CMBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | ABS-residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | ABS-non residential [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Foreign denominated: Governments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed maturities [Member] | Foreign Denominated: Credit [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1.9	1.8
Significant Unobservable Inputs (Level 3) [Member] | Other investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Short-term investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 3.3	$ 6.9

XML

Disclosures about Fair Value of Financial Instruments - Summary of Company's Financial Instruments Whose Carrying Amount Did Not Equal Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	$ 401.1	$ 400.9
Fair Value	347.7	345.1
Junior Subordinated Debentures [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	193.3	193.3
Fair Value	155.2	151.8
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	143.8	143.8
Fair Value	141.2	143.2
Other Indebtedness [Member] | Floating Rate Loan Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	63.2	63.0
Fair Value	50.7	49.5
Other Indebtedness [Member] | Notes Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	0.8	0.8
Fair Value	$ 0.6	$ 0.6

XML

Income Taxes - Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Examination [Line Items]
Pre-tax income (loss)	$ 42.8	$ 25.0	$ 80.3	$ 53.1
Bermuda [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	3.9	9.9	20.0	10.2
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
United States [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	31.5	8.3	49.0	33.7
Effective Tax Rate	26.70%	9.70%	23.70%	23.40%
United Kingdom [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	10.7	9.0	16.7	13.7
Effective Tax Rate	25.90%	0.70%	25.80%	11.00%
Belgium [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	0	0	0	0.1
Effective Tax Rate	(39.00%)	138.30%	(35.30%)	50.50%
Brazil [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	(2.9)	(1.9)	(4.7)	(3.5)
Effective Tax Rate	0.00%	(1.10%)	0.00%	0.00%
Dubai [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	0	0.1	0	0.1
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
Ireland [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	0	0	0	(0.1)
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
Malta [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	(0.4)	(0.4)	(0.7)	(1.1)
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
Switzerland [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	$ 0	$ 0	$ 0	$ 0
Effective Tax Rate	22.20%	22.30%	19.60%	23.90%

XML

Reserves for Losses and Loss Adjustment Expenses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Paid loss recoverables excluded from reinsurance recoverables on unpaid losses and LAE	$ 127.4	$ 78.8
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	(17.3)	(7.4)
Commercial Automobile [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	4.7
Commercial Specialty [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	0.1	18.0
General Liability [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	7.0	22.6
Directors And Officers [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	0.8
Brazil [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	0.4
Excess and Surplus Lines [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	14.4	21.7
Surety Line Of Business [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	0
International Specialty [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	0.6	3.6
Syndicate 1200 Segment [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	3.5
Run-Off Lines [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	0.1	2.2
Unfavorable Development [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	2.1	2.9
Short-Tail Lines [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	5.9	1.5
Automobile Liability Lines of Business [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years		1.4
Property Lines [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	2.0
Short-Tail Non-Catastrophe Losses [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years		4.6
Long-Tail Professional liability [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years		0.3
Short-Tail Catastrophe Losses [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years		1.4
Unwinding of Workers Compensation Reserve Discount [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years		0.5
Involuntary Lines [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years		0.3
General and Products Liability Lines of Business [Member] | Excess and Surplus Lines [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	19.9	18.1
Crop Losses [Member] | Marine Industry Loss Warranty [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	3.8
Assumed Contract [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	1.2
Professional Liability Lines [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	2.3
Workers Compensation [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	$ 2.1	$ 6.0

XML

Investments - Schedule of Amortized Cost and Fair Values of Fixed Maturity Investments, by Contractual Maturity (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 203.5
Amortized Cost, Due after one year through five years	1,041.7
Amortized Cost, Due after five years through ten years	727.0
Amortized Cost, Thereafter	285.0
Amortized Cost, Structured securities	495.7
Amortized Cost, Total	2,752.9
Fair Value, Due in one year or less	204.6
Fair Value, Due after one year through five years	1,052.8
Fair Value, Due after five years through ten years	750.0
Fair Value, Thereafter	280.1
Fair Value, Structured securities	507.1
Fair Value, Total	$ 2,794.6

XML

Information Provided in Connection with Outstanding Debt of Subsidiaries (Tables)

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Condensed Consolidating Balance Sheet

CONDENSED CONSOLIDATING BALANCE SHEET

June 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US,  Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Assets
Investments	$	(3.8	)	$	2,715.8	$	1,273.4		$	0.0		$	3,985.4
Cash		0.0			83.8		18.2			0.0			102.0
Premiums receivable		0.0			158.4		290.2			0.0			448.6
Reinsurance recoverables		0.0			1,179.3		70.4			0.0			1,249.7
Goodwill and other intangible assets		0.0			138.4		104.1			0.0			242.5
Current income taxes receivable, net		0.0			4.5		4.4			0.0			8.9
Deferred acquisition costs, net		0.0			54.0		57.9			0.0			111.9
Ceded unearned premiums		0.0			92.2		147.5			0.0			239.7
Other assets		5.8			115.2		65.6			0.0			186.6
Due from affiliates		0.0			1.6		(1.6	)		0.0			0.0
Intercompany note receivable		0.0			121.1		(121.1	)		0.0			0.0
Investments in subsidiaries		1,616.4			0.0		0.0			(1,616.4	)		0.0
Total assets	$	1,618.4		$	4,664.3	$	1,909.0		$	(1,616.4	)	$	6,575.3
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0		$	2,209.6		1,024.3		$	0.0		$	3,233.9
Unearned premiums		0.0			422.0		387.7			0.0			809.7
Funds held and ceded reinsurance payable, net		0.0			617.9		(165.2	)		0.0			452.7
Long-term debt		49.0			288.9		63.2			0.0			401.1
Current income taxes payable, net		0.0			0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0			19.4		9.6			0.0			29.0
Accrued underwriting expenses and other liabilities		14.9			92.0		50.9			0.0			157.8
Due to affiliates		(6.1	)		0.0		0.0			6.1			0.0
Intercompany note payable		69.5			0.0		0.0			(69.5	)		0.0
Total liabilities		127.3			3,649.8		1,370.5			(63.4	)		5,084.2
Total shareholders’ equity		1,491.1			1,014.5		538.5			(1,553.0	)		1,491.1
Total liabilities and shareholders’ equity	$	1,618.4		$	4,664.3	$	1,909.0		$	(1,616.4	)	$	6,575.3

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Assets
Investments	$	(0.9	)	$	2,794.7	$	1,406.9		$	0.0		$	4,200.7
Cash		0.0			73.9		21.9			0.0			95.8
Premiums receivable		0.0			155.1		205.9			0.0			361.0
Reinsurance recoverables		0.0			1,155.1		165.8			0.0			1,320.9
Goodwill and other intangible assets		0.0			139.5		105.8			0.0			245.3
Current income taxes receivable, net		0.0			8.7		4.2			0.0			12.9
Deferred acquisition costs, net		0.0			54.6		44.8			0.0			99.4
Ceded unearned premiums		0.0			85.9		107.7			0.0			193.6
Other assets		4.3			104.0		51.0			0.0			159.3
Due from affiliates		5.0			1.2		(1.2	)		(5.0	)		0.0
Intercompany note receivable		0.0			119.6		(119.6	)		0.0			0.0
Investments in subsidiaries		1,621.1			0.0		0.0			(1,621.1	)		0.0
Total assets	$	1,629.5		$	4,692.3	$	1,993.2		$	(1,626.1	)	$	6,688.9
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0		$	2,226.3	$	997.2		$	0.0		$	3,223.5
Unearned premiums		0.0			415.6		314.6			0.0			730.2
Funds held and ceded reinsurance payable, net		0.0			598.4		47.4			0.0			645.8
Long-term debt		49.0			288.9		63.0			0.0			400.9
Current income taxes payable, net		0.0			0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0			36.8		7.0			0.0			43.8
Accrued underwriting expenses and other liabilities		11.3			84.1		35.2			0.0			130.6
Due to affiliates		0.0			0.0		0.0			0.0			0.0
Intercompany note payable		55.1			0.0		0.0			(55.1	)		0.0
Total liabilities		115.4			3,650.1		1,464.4			(55.1	)		5,174.8
Total shareholders’ equity		1,514.1			1,042.2		528.8			(1,571.0	)		1,514.1
Total liabilities and shareholders’ equity	$	1,629.5		$	4,692.3	$	1,993.2		$	(1,626.1	)	$	6,688.9

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

Condensed Consolidating Statement of (Loss) Income

CONDENSED CONSOLIDATING STATEMENT OF INCOME

FOR THE THREE MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	108.3		$	219.2		$	0.0		$	327.5
Net investment income		0.0			19.6			6.0			(0.3	)		25.3
Fee income, net		0.0			(1.0	)		1.2			0.0			0.2
Net realized investment gains		0.0			18.0			(7.0	)		0.0			11.0
Total revenue		0.0			144.9			219.4			(0.3	)		364.0
Expenses:
Losses and loss adjustment expenses		0.0			64.7			128.0			0.0			192.7
Other reinsurance-related expenses		0.0			1.4			3.3			0.0			4.7
Underwriting, acquisition and insurance expenses		6.3			43.5			74.8			0.0			124.6
Interest expense		0.8			3.9			0.7			(0.3	)		5.1
Foreign currency exchange (gain) loss		0.1			0.0			(6.0	)		0.0			(5.9	)
Total expenses		7.2			113.5			200.8			(0.3	)		321.2
(Loss) income before income taxes		(7.2	)		31.4			18.6			0.0			42.8
Provision for income taxes		0.0			8.4			2.7			0.0			11.1
Net (loss) income before equity in earnings of subsidiaries		(7.2	)		23.0			15.9			0.0			31.7
Equity in undistributed earnings of subsidiaries		38.9			0.0			0.0			(38.9	)		0.0
Net income	$	31.7		$	23.0		$	15.9		$	(38.9	)	$	31.7

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF (LOSS) INCOME

FOR THE THREE MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	109.9		$	180.3		$	0.0		$	290.2
Net investment income		0.0			22.3			7.7			0.0			30.0
Fee income, net		0.0			(0.2	)		0.7			0.0			0.5
Net realized investment gains		0.0			(2.1	)		(0.6	)		0.0			(2.7	)
Total revenue		0.0			129.9			188.1			0.0			318.0
Expenses:
Losses and loss adjustment expenses		0.0			74.4			101.4			0.0			175.8
Other reinsurance-related expenses		0.0			0.0			6.9			0.0			6.9
Underwriting, acquisition and insurance expenses		7.6			42.9			64.1			0.0			114.6
Interest expense		1.0			3.8			0.7			0.0			5.5
Foreign currency exchange (gain) loss		0.0			0.3			(10.1	)		0.0			(9.8	)
Total expenses		8.6			121.4			163.0			0.0			293.0
Income (loss) before income taxes		(8.6	)		8.5			25.1			0.0			25.0
Provision for income taxes		0.0			0.9			0.1			0.0			1.0
Net income (loss) before equity in losses of subsidiaries		(8.6	)		7.6			25.0			0.0		$	24.0
Equity in undistributed losses of subsidiaries		32.6			0.0			0.0			(32.6	)		0.0
Net income	$	24.0		$	7.6		$	25.0		$	(32.6	)	$	24.0

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF INCOME

FOR THE SIX MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	216.0		$	415.7		$	0.0		$	631.7
Net investment income		0.0			40.5			13.3			(0.6	)		53.2
Fee income, net		0.0			(1.3	)		1.5			0.0			0.2
Net realized investment gains		0.0			25.6			(5.1	)		0.0			20.5
Total revenue		0.0			280.8			425.4			(0.6	)		705.6
Expenses:
Losses and loss adjustment expenses		0.0			129.0			234.2			0.0			363.2
Other reinsurance-related expenses		0.0			2.9			6.9			0.0			9.8
Underwriting, acquisition and insurance expenses		12.5			92.2			146.6			0.0			251.3
Interest expense		1.6			7.6			1.4			(0.6	)		10.0
Foreign currency exchange (gain) loss		0.0			0.2			(9.2	)		0.0			(9.0	)
Total expenses		14.1			231.9			379.9			(0.6	)		625.3
(Loss) income before income taxes		(14.1	)		48.9			45.5			0.0			80.3
Provision for income taxes		0.0			11.6			4.3			0.0			15.9
Net (loss) income before equity in earnings of subsidiaries		(14.1	)		37.3			41.2			0.0			64.4
Equity in undistributed earnings of subsidiaries		78.5			0.0			0.0			(78.5	)		0.0
Net income	$	64.4		$	37.3		$	41.2		$	(78.5	)	$	64.4

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF (LOSS) INCOME

FOR THE SIX MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	218.8	$	348.7		$	0.0		$	567.5
Net investment income		0.0			44.2		17.2			0.0			61.4
Fee income, net		0.0			0.0		1.8			0.0			1.8
Net realized investment gains		0.0			7.5		2.9			0.0			10.4
Total revenue		0.0			270.5		370.6			—			641.1
Expenses:
Losses and loss adjustment expenses		0.0			142.9		198.7			0.0			341.6
Other reinsurance-related expenses		0.0			0.0		13.8			0.0			13.8
Underwriting, acquisition and insurance expenses		14.7			86.1		127.5			0.0			228.3
Interest expense		1.9			7.6		1.7			0.0			11.2
Foreign currency exchange (gain) loss		0.0			0.2		(7.1	)		0.0			(6.9	)
Total expenses		16.6			236.8		334.6			0.0			588.0
Income (loss) before income taxes		(16.6	)		33.7		36.0			0.0			53.1
Provision for income taxes		0.0			7.9		1.6			0.0			9.5
Net income (loss) before equity in losses of subsidiaries		(16.6	)		25.8		34.4			0.0		$	43.6
Equity in undistributed losses of subsidiaries		60.2			0.0		0.0			(60.2	)		0.0
Net income	$	43.6		$	25.8	$	34.4		$	(60.2	)	$	43.6

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

Condensed Consolidating Statement of Cash Flows

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE SIX MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Net cash flows from operating activities	$	(7.4	)	$	(3.4	)	$	(85.4	)	$	0.0		$	(96.2	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			433.8			486.1			0.0			919.9
Proceeds from maturities and mandatory calls of investments		0.0			160.9			50.0			0.0			210.9
Purchases of investments		0.0			(538.6	)		(387.7	)		0.0			(926.3	)
Change in short-term investments and foreign regulatory deposits		0.0			(12.8	)		(35.7	)		0.0			(48.5	)
Settlements of foreign currency exchange forward contracts		(0.1	)		0.0			(2.6	)		0.0			(2.7	)
Issuance of intercompany note, net		0.0			0.0			(14.0	)		14.0			0.0
Other, net		(0.1	)		0.9			(14.2	)		0.0			(13.4	)
Cash provided (used) by investing activities		(0.2	)		44.2			81.9			14.0			139.9
Cash flows from financing activities:
Borrowings under intercompany note, net		14.0			0.0			0.0			(14.0	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		0.0			0.0			0.0			0.0			0.0
Activity under stock incentive plans		1.4			0.0			0.1			0.0			1.5
Repurchase of Company’s common shares		0.0			(30.9	)		0.0			0.0			(30.9	)
Excess tax expense from share-based payment arrangements		0.0			0.0			0.0			0.0			0.0
Payment of cash dividend to common shareholders		(7.8	)		0.0			0.0			0.0			(7.8	)
Cash provided (used) by financing activities		7.6			(30.9	)		0.1			(14.0	)		(37.2	)
Effect of exchange rate changes on cash		0.0			0.0			(0.3	)		0.0			(0.3	)
Change in cash		0.0			9.9			(3.7	)		0.0			6.2
Cash, beginning of period		0.0			73.9			21.9			0.0			95.8
Cash, end of period	$	0.0		$	83.8		$	18.2		$	0.0		$	102.0

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE SIX MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Net cash flows from operating activities	$	(15.3	)	$	(26.8	)	$	13.7		$	0.0		$	(28.4	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			391.2			344.4			0.0			735.6
Proceeds from maturities and mandatory calls of investments		0.0			126.8			79.1			0.0			205.9
Purchases of investments		0.0			(503.3	)		(363.3	)		0.0			(866.6	)
Change in short-term investments and foreign regulatory deposits		(0.1	)		43.9			(60.0	)		0.0			(16.2	)
Settlements of foreign currency exchange forward contracts		2.4			0.0			(3.2	)		0.0			(0.8	)
Issuance of intercompany note, net		0.0			(10.0	)		(9.1	)		19.1			0.0
Other, net		0.0			(15.3	)		(4.2	)		0.0			(19.5	)
Cash provided (used) by investing activities		2.3			33.3			(16.3	)		19.1			38.4
Cash flows from financing activities:
Borrowings under intercompany note, net		19.1			0.0			0.0			(19.1	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		0.0			0.0			0.0			0.0			0.0
Activity under stock incentive plans		0.2			0.0			0.0			0.0			0.2
Repurchase of Company’s common shares		0.0			(27.8	)		0.0			0.0			(27.8	)
Excess tax expense from share-based payment arrangements		0.0			0.0			0.0			0.0			0.0
Payment of cash dividend to common shareholders		(6.3	)		0.0			0.1			0.0			(6.2	)
Cash (used) provided by financing activities		13.0			(27.8	)		0.1			(19.1	)		(33.8	)
Effect of exchange rate changes on cash		0.0			0.0			(1.3	)		0.0			(1.3	)
Change in cash		0.0			(21.3	)		(3.8	)		0.0			(25.1	)
Cash, beginning of period		0.0			85.1			15.8			0.0			100.9
Cash, end of period	$	0.0		$	63.8		$	12.0		$	0.0		$	75.8

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

XML

Recently Issued Accounting Standards - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013
Accounting Policies [Abstract]
Intangible assets more likely-than-not threshold	50.00%

XML

Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

7. Commitments and Contingencies

Argo Group’s subsidiaries are parties to legal actions incidental to their business. Based on the opinion of counsel, management believes that the resolution of these matters will not materially affect our financial condition or results of operations.

XML

Share-based Compensation - Summary of Stock-Settled SARs Activity Under 2007 Plan (Detail) (Stock-Settled SARs Activity [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Stock-Settled SARs Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	1,261,557
Granted, Shares	332,004
Exercised, shares	(99,085)
Expired or forfeited, Shares	(124,794)
Shares, Outstanding at June 30, 2013	1,369,682
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 27.04
Granted, Weighted-Average Exercise Price	$ 37.21
Exercised, Weighted-Average Exercise Price	$ 29.26
Expired or forfeited, Weighted-Average Exercise Price	$ 26.40
Weighted-Average Exercise Price, Outstanding at June 30, 2013	$ 29.35

XML

Reserves for Losses and Loss Adjustment Expenses (Tables)

6 Months Ended

Jun. 30, 2013

Insurance [Abstract]

Reinsurance Recoverables

The following table provides a reconciliation of reserves for losses and loss adjustment expenses (“LAE”), net of reinsurance, to the gross amounts reported in the Consolidated Balance Sheets. Reinsurance recoverables in this note exclude paid loss recoverables of $127.4 million and $78.8 million as of June 30, 2013 and 2012, respectively:

	For the Six Months Ended June 30,
(in millions)	2013			2012
Net reserves beginning of the year	$	2,110.9		$	2,336.7
Add:
Net reserves from assumed retroactive insurance contract (1)		0.0			13.0
Losses and LAE incurred during current calendaryear, net of reinsurance:
Current accident year		380.5			349.0
Prior accident years		(17.3	)		(7.4	)
Losses and LAE incurred during calendar year, net of reinsurance		363.2			341.6
Deduct:
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year		73.5			60.2
Prior accident years		290.3			311.1
Losses and LAE payments made during current calendar year, net of reinsurance:		363.8			371.3
Change in participation interest (2)		10.4			(3.1	)
Foreign exchange adjustments		(9.1	)		(7.7	)
Net reserves - end of period		2,111.6			2,309.2
Add:
Reinsurance recoverables on unpaid losses and LAE, end of period		1,122.3			913.9
Gross reserves - end of period	$	3,233.9		$	3,223.1

(1) Amount represents reserves assumed resulting from participation in Brazilian Motor Third-Party Liability Insurance Pool effective January 1, 2012.

(2) Amount represents (decrease) increase in reserves due to change in syndicate participation.

XML

Investments - Schedule of Company's Gross Realized Investment Gains (Losses) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Investments [Line Items]
Gross realized investment and other gains	$ 23.9	$ 9.1	$ 47.1	$ 29.1
Gross realized investment and other losses	(12.9)	(11.8)	(26.6)	(18.7)
Net realized investment (losses) gains	11.0	(2.7)	20.5	10.4
Fixed maturities [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	10.2	7.2	21.7	15.5
Gross realized investment and other losses	(1.9)	(2.2)	(8.4)	(5.1)
Equity securities [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	7.2	0.2	7.7	0.2
Gross realized investment and other losses	(0.7)	(0.2)	(0.7)	(0.3)
Other investments [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	6.5	1.6	17.6	13.1
Gross realized investment and other losses	(9.8)	(8.3)	(12.1)	(12.1)
Short-term investments [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	0	0.1	0.1	0.3
Gross realized investment and other losses	(0.1)	(0.3)	(0.2)	(0.3)
Other-than-temporary impairment losses on fixed maturities [Member]
Schedule of Investments [Line Items]
Gross realized investment and other losses	(0.3)	(0.3)	(0.3)	(0.3)
Other-than-temporary impairment losses on equity securities [Member]
Schedule of Investments [Line Items]
Gross realized investment and other losses	(0.1)	(0.5)	(1.5)	(0.6)
Other-than-temporary impairment losses on other investments [Member]
Schedule of Investments [Line Items]
Gross realized investment and other losses	$ 0	$ 0	$ (3.4)	$ 0

XML

Reserves for Losses and Loss Adjustment Expenses

6 Months Ended

Jun. 30, 2013

Insurance [Abstract]

Reserves for Losses and Loss Adjustment Expenses

10. Reserves for Losses and Loss Adjustment Expenses

The following table provides a reconciliation of reserves for losses and loss adjustment expenses (“LAE”), net of reinsurance, to the gross amounts reported in the Consolidated Balance Sheets. Reinsurance recoverables in this note exclude paid loss recoverables of $127.4 million and $78.8 million as of June 30, 2013 and 2012, respectively:

	For the Six Months Ended June 30,
(in millions)	2013			2012
Net reserves beginning of the year	$	2,110.9		$	2,336.7
Add:
Net reserves from assumed retroactive insurance contract (1)		0.0			13.0
Losses and LAE incurred during current calendaryear, net of reinsurance:
Current accident year		380.5			349.0
Prior accident years		(17.3	)		(7.4	)
Losses and LAE incurred during calendar year, net of reinsurance		363.2			341.6
Deduct:
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year		73.5			60.2
Prior accident years		290.3			311.1
Losses and LAE payments made during current calendar year, net of reinsurance:		363.8			371.3
Change in participation interest (2)		10.4			(3.1	)
Foreign exchange adjustments		(9.1	)		(7.7	)
Net reserves - end of period		2,111.6			2,309.2
Add:
Reinsurance recoverables on unpaid losses and LAE, end of period		1,122.3			913.9
Gross reserves - end of period	$	3,233.9		$	3,223.1

(1) Amount represents reserves assumed resulting from participation in Brazilian Motor Third-Party Liability Insurance Pool effective January 1, 2012.

(2) Amount represents (decrease) increase in reserves due to change in syndicate participation.

Included in losses and LAE for the six months ended June 30, 2013 was $17.3 million in favorable prior years’ loss reserve development comprised of the following: $14.4 million net favorable development in the Excess and Surplus Lines segment primarily caused by favorable development of $19.9 million in the general and products liability lines, partially offset with $4.7 million of unfavorable development in commercial automobile; $0.1 million of net unfavorable development in the Commercial Specialty segment, primarily driven by $7.0 million unfavorable development in general liability due to increases in claim severity and $2.1 million unfavorable development in automobile liability, offset by $5.9 million favorable development in short tail lines, $2.1 million favorable development in workers compensation and $0.8 million favorable development on an assumed Directors & Officers program; $0.6 million net unfavorable development in the International Specialty segment primarily driven by $3.8 million of unfavorable development from a marine industry loss warranty and crop losses and $0.4 million in unfavorable development in our Brazil unit, partially offset by $2.3 million of favorable development on professional lines due to favorable loss activity and $1.2 million on assumed contract from older years; $3.5 million net favorable development in the Syndicate 1200 segment driven by favorable development in various property classes, partially offset by unfavorable development in the onshore energy and liability classes of business; $0.1 million favorable development in the Runoff Lines segment primarily caused by favorable development related to the 2005 hurricanes, partially offset by unfavorable development related to commutations and the unwinding of the workers compensation reserve discount.

Included in losses and LAE for the six months ended June 30, 2012 was $7.4 million in favorable prior years’ loss reserve development comprised of the following: $21.7 million of favorable development in the Excess and Surplus Lines segment primarily driven by $18.1 million of favorable development in the general and products liability lines of business primarily in accident year 2009, $2.0 million of favorable development in the property lines, primarily in accident year 2010 and $1.4 million of favorable development in the automobile liability lines of business, primarily in accident year 2009; $18.0 million of net unfavorable development in the Commercial Specialty segment driven by $22.6 million of unfavorable development in general liability due to increases in claim severity, $2.9 million of unfavorable development in the automobile liability lines of business, partially offset by $6.0 million of favorable development in workers compensation and $1.5 million of favorable development in short-tail lines; $3.6 million of net favorable development in the International Specialty segment primarily driven by $4.6 million of favorable development attributable to short-tail non-catastrophe losses, $0.3 million of favorable development in long-tail professional liability, partially offset by $1.4 million of unfavorable development related to short-tail catastrophe losses primarily due to the 2011 catastrophe events; $2.3 million of net favorable development in the Syndicate 1200 segment primarily driven by favorable development in the property facultative class of business as a claim relating to Hurricane Ike was settled for less than case reserves, partially offset by unfavorable development in the professional indemnity class of business which was driven by an increase in prior year premiums as a result of re-estimation of premium income written through binding authorities; and $2.2 million of net unfavorable development in the Run-off Lines segment driven by $2.0 million of unfavorable development related to risk management run-off reserves due to strengthening the reserve for unallocated loss adjustment expenses, $0.5 million of unfavorable development related to the unwinding of the workers compensation reserve discount, partially offset by $0.3 million of favorable development in the involuntary lines.

In the opinion of management, our reserves represent the best estimate of our ultimate liabilities, based on currently known facts, current law, current technology and assumptions considered reasonable where facts are not known. Due to the significant uncertainties and related management judgments, there can be no assurance that future loss development, favorable or unfavorable, will not occur.

XML

Supplemental Cash Flow Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes Paid Net [Abstract]
Income taxes paid	$ 5.0	$ 13.1	$ 5.0	$ 13.1

XML

Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Accumulated Other Comprehensive Income

6. Accumulated Other Comprehensive Income

In February 2013, the FASB issued Accounting Standards Update 2013-02 that amends Accounting Standards Codification (“ASC”) 220, “Comprehensive Income.” See Note 2, “Recently Issued Accounting Standards” for additional information regarding the provisions of this update. Effective January 1, 2013, we adopted the update prospectively.

A summary of changes in accumulated other comprehensive income, net of taxes (where applicable) by component for the three and six months ended June 30, 2013 is presented in the following table:

(in millions)	Foreign currency translation adjustments			Unrealized holding gains on securities			Defined benefit pension plans			Total
Beginning balance, January 1, 2013	$	(8.7	)	$	204.1		$	(5.9	)	$	189.5
Other comprehensive income before reclassifications		0.0			(41.7	)		0.0			(41.7	)
Amounts reclassified from accumulated other comprehensive income		(1.9	)		(10.3	)		0.0			(12.2	)
Net current-period other comprehensive income		(1.9	)		(52.0	)		0.0			(53.9	)
Ending balance, June 30, 2013	$	(10.6	)	$	152.1		$	(5.9	)	$	135.6

The amounts reclassified from accumulated other comprehensive income shown in the above table have been included in the following captions in the Consolidated Statement of Income:

(in millions)	For the Three Months Ended June 30, 2013			For the Six Months Ended June 30, 2013
Unrealized gains and losses on securities
Net realized investment gains	$	(14.3	)	$	(15.0	)
Provision for income taxes		4.8			4.7
Net of taxes	$	(9.5	)	$	(10.3	)

XML

Basis of Presentation

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Basis of Presentation

1. Basis of Presentation

The accompanying consolidated financial statements of Argo Group International Holdings, Ltd. (“Argo Group,” “we” or the “Company”) and its subsidiaries have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. The preparation of interim financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The major estimates reflected in our consolidated financial statements include, but are not limited to, the reserves for losses and loss adjustment expenses, reinsurance recoverables, including the reinsurance recoverables allowance for doubtful accounts, estimates of written and earned premiums, reinsurance premium receivable, the fair value of investments and the assessment of potential impairment, the valuation of goodwill and intangibles and our deferred tax asset valuation allowance. Actual results could differ from those estimates. Certain financial information that normally is included in annual financial statements, including certain financial statement footnotes, prepared in accordance with GAAP, is not required for interim reporting purposes and has been condensed or omitted. These statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2012, filed with the Securities and Exchange Commission on February 28, 2013.

The interim financial information as of, and for the three and six months ended, June 30, 2013 and 2012 is unaudited. However, in the opinion of management, the interim information includes all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the results presented for the interim periods. The operating results for the interim periods are not necessarily indicative of the results to be expected for the full year. All significant intercompany amounts have been eliminated in consolidation.

XML

Accumulated Other Comprehensive Income - Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unrealized gains and losses on securities
Net realized investment gains	$ (14.3)	$ (4.0)	$ (15.0)	$ (9.4)
Provision for income taxes	4.8	1.2	4.7	2.8
Net of taxes	$ (9.5)		$ (10.3)

XML

Shareholders' Equity - Schedule of Repurchase of Shares (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013
Schedule Of Share Repurchase Programs [Line Items]
Number of Shares Repurchased	427,751
Average Price of Shares Repurchased		$ 41.17	$ 42.26
Total Cost	$ 17.8
12/14/2012 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Date Trading Plan Initiated			Dec. 14, 2012
2013 Purchase Period			01/01/13-01/17/13
Trading plans purchase period date range start			01/01/13
Trading plans purchase period date range end			01/17/13
Number of Shares Repurchased			171,480
Average Price of Shares Repurchased			$ 35.41
Total Cost			6.0
Repurchase Authorization Year			2011
03/15/2013 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Date Trading Plan Initiated			Mar. 15, 2013
2013 Purchase Period			03/16/13-05/01/13
Trading plans purchase period date range start			03/16/13
Trading plans purchase period date range end			05/01/13
Number of Shares Repurchased			205,452
Average Price of Shares Repurchased			$ 40.75
Total Cost			8.3
Repurchase Authorization Year			2011
06/14/2013 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Date Trading Plan Initiated			Jun. 14, 2013
2013 Purchase Period			06/18/13-07/31/13
Trading plans purchase period date range start			06/18/13
Trading plans purchase period date range end			07/31/13
Number of Shares Repurchased			195,217
Average Price of Shares Repurchased			$ 43.47
Total Cost			$ 8.5
Repurchase Authorization Year			2011

XML

Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Elements [Abstract]

Schedule of Interest Paid

Interest paid. Interest paid for the six months ended June 30, was as follows:

	For the Six Months Ended June 30,
(in millions)	2013		2012
Senior unsecured fixed rate notes	$	4.7	$	0.0
Junior subordinated debentures		3.8		9.4
Other indebtedness		0.5		1.6
Revolving credit facility		0.0		0.0
Total interest paid	$	9.0	$	11.0

XML

Information Provided in Connection with Outstanding Debt of Subsidiaries - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	$ (96.2)	$ (28.4)
Cash flows from investing activities:
Proceeds from sales of investments	919.9	735.6
Proceeds from maturities and mandatory calls of investments	210.9	205.9
Purchases of investments	(926.3)	(866.6)
Change in short-term investments and foreign regulatory deposits	(0.7)	13.0
Settlements of foreign currency exchange forward contracts	(2.7)	(0.8)
Issuance of intercompany note, net	0	0
Other, net	(0.4)	(0.3)
Cash provided (used) by investing activities	139.9	38.4
Cash flows from financing activities:
Borrowings under intercompany note, net	0	0
Proceeds from issuance of senior unsecured fixed rate notes	0	0
Activity under stock incentive plans	1.5	0.2
Repurchase of Company's common shares	(30.9)	(27.8)
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	(7.8)	(6.2)
Cash used by financing activities	(37.2)	(33.8)
Effect of exchange rate changes on cash	(0.3)	(1.3)
Change in cash	6.2	(25.1)
Cash, beginning of period	95.8	100.9
Cash, end of period	102.0	75.8
Argo Group International Holdings, Ltd (Parent Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	(7.4)	(15.3)
Cash flows from investing activities:
Proceeds from sales of investments	0	0
Proceeds from maturities and mandatory calls of investments	0	0
Purchases of investments	0	0
Change in short-term investments and foreign regulatory deposits	0	(0.1)
Settlements of foreign currency exchange forward contracts	(0.1)	2.4
Issuance of intercompany note, net	0	0
Other, net	(0.1)	0
Cash provided (used) by investing activities	(0.2)	2.3
Cash flows from financing activities:
Borrowings under intercompany note, net	14.0	19.1
Proceeds from issuance of senior unsecured fixed rate notes	0	0
Activity under stock incentive plans	1.4	0.2
Repurchase of Company's common shares	0	0
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	(7.8)	(6.3)
Cash used by financing activities	7.6	13.0
Effect of exchange rate changes on cash	0	0
Change in cash	0	0
Cash, beginning of period	0	0
Cash, end of period	0	0
Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer) [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	(3.4)	(26.8)
Cash flows from investing activities:
Proceeds from sales of investments	433.8	391.2
Proceeds from maturities and mandatory calls of investments	160.9	126.8
Purchases of investments	(538.6)	(503.3)
Change in short-term investments and foreign regulatory deposits	(12.8)	43.9
Settlements of foreign currency exchange forward contracts		0
Issuance of intercompany note, net	0	(10.0)
Other, net	0.9	(15.3)
Cash provided (used) by investing activities	44.2	33.3
Cash flows from financing activities:
Borrowings under intercompany note, net	0	0
Proceeds from issuance of senior unsecured fixed rate notes	0	0
Activity under stock incentive plans	0	0
Repurchase of Company's common shares	(30.9)	(27.8)
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	0	0
Cash used by financing activities	(30.9)	(27.8)
Effect of exchange rate changes on cash	0	0
Change in cash	9.9	(21.3)
Cash, beginning of period	73.9	85.1
Cash, end of period	83.8	63.8
Other Subsidiaries and Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	(85.4)	13.7
Cash flows from investing activities:
Proceeds from sales of investments	486.1	344.4
Proceeds from maturities and mandatory calls of investments	50.0	79.1
Purchases of investments	(387.7)	(363.3)
Change in short-term investments and foreign regulatory deposits	(35.7)	(60.0)
Settlements of foreign currency exchange forward contracts	(2.6)	(3.2)
Issuance of intercompany note, net	(14.0)	(9.1)
Other, net	(14.2)	(4.2)
Cash provided (used) by investing activities	81.9	(16.3)
Cash flows from financing activities:
Borrowings under intercompany note, net	0	0
Proceeds from issuance of senior unsecured fixed rate notes	0	0
Activity under stock incentive plans	0.1	0
Repurchase of Company's common shares	0	0
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	0	0.1
Cash used by financing activities	0.1	0.1
Effect of exchange rate changes on cash	(0.3)	(1.3)
Change in cash	(3.7)	(3.8)
Cash, beginning of period	21.9	15.8
Cash, end of period	18.2	12.0
Consolidating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	0	0
Cash flows from investing activities:
Proceeds from sales of investments	0	0
Proceeds from maturities and mandatory calls of investments	0	0
Purchases of investments	0	0
Change in short-term investments and foreign regulatory deposits	0	0
Settlements of foreign currency exchange forward contracts		0
Issuance of intercompany note, net	14.0	19.1
Other, net	0	0
Cash provided (used) by investing activities	14.0	19.1
Cash flows from financing activities:
Borrowings under intercompany note, net	(14.0)	(19.1)
Proceeds from issuance of senior unsecured fixed rate notes	0	0
Activity under stock incentive plans	0	0
Repurchase of Company's common shares	0	0
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	0	0
Cash used by financing activities	(14.0)	(19.1)
Effect of exchange rate changes on cash	0	0
Change in cash	0	0
Cash, beginning of period	0	0
Cash, end of period	$ 0	$ 0

XML

Reserves for Losses and Loss Adjustment Expenses - Reinsurance Recoverables (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Insurance [Abstract]
Net reserves beginning of the year	$ 2,110.9	$ 2,336.7
Net reserves from assumed retroactive insurance contract	0	13.0
Losses and LAE incurred during current calendar year, net of reinsurance:
Current accident year	380.5	349.0
Prior accident years	(17.3)	(7.4)
Losses and LAE incurred during calendar year, net of reinsurance	363.2	341.6
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year	73.5	60.2
Prior accident years	290.3	311.1
Losses and LAE payments made during current calendar year, net of reinsurance:	363.8	371.3
Change in participation interest	10.4	(3.1)
Foreign exchange adjustments	(9.1)	(7.7)
Net reserves - end of period	2,111.6	2,309.2
Reinsurance recoverables on unpaid losses and LAE, end of period	1,122.3	913.9
Gross reserves - end of period	$ 3,233.9	$ 3,223.1

XML

Share-based Compensation - Fair Value Assumptions (Detail)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free rate of return	1.45%	1.09%
Expected dividend yields	1.67%	1.67%
Expected award life (years)	5 years 7 days	5 years 11 days
Expected volatility	31.90%	32.60%

XML

Segment Information

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Segment Information

13. Segment Information

We are primarily engaged in writing property and casualty insurance and reinsurance. We have four ongoing reporting segments: Excess and Surplus Lines, Commercial Specialty, International Specialty and Syndicate 1200. Additionally, we have a Run-off Lines segment for certain products that we no longer write.

We consider many factors, including the nature of each segment’s insurance and reinsurance products, production sources, distribution strategies and the regulatory environment, in determining how to aggregate reporting segments.

In evaluating the operating performance of our segments, we focus on core underwriting and investing results before the consideration of realized gains or losses from the sales of investments. Intersegment transactions are allocated to the segment that initiated the transaction. Realized investment gains are reported as a component of the Corporate and Other segment, as decisions regarding the acquisition and disposal of securities reside with the investment function and are not under the control of the individual business segments. Identifiable assets by segment are those assets used in the operation of each segment.

Revenue and income (loss) before income taxes for each segment for the three and six months ended June 30, 2013 and 2012 were as follows:

	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Revenue:
Earned premiums
Excess and Surplus Lines	$	108.7		$	98.5		$	213.8		$	194.7
Commercial Specialty		75.3			81.2			150.5			163.2
International Specialty		36.4			29.4			69.1			57.4
Syndicate 1200		107.4			80.4			198.3			151.5
Run-off Lines		(0.3	)		0.7			0.0			0.7
Total earned premiums		327.5			290.2			631.7			567.5
Net investment income
Excess and Surplus Lines		11.2			13.0			22.1			26.0
Commercial Specialty		6.1			7.0			12.0			13.9
International Specialty		1.7			2.8			4.0			6.9
Syndicate 1200		2.8			3.7			5.6			7.6
Run-off Lines		2.8			3.5			5.6			7.0
Corporate and Other		0.7			0.0			3.9			0.0
Total net investment income		25.3			30.0			53.2			61.4
Fee income, net		0.2			0.5			0.2			1.8
Net realized investment gains (losses)		11.0			(2.7	)		20.5			10.4
Total revenue	$	364.0		$	318.0		$	705.6		$	641.1
	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
(in millions)	2013			2012			2013			2012
Income (loss) before income taxes
Excess and Surplus Lines	$	16.7		$	22.3		$	30.6		$	41.2
Commercial Specialty		1.5			(8.8	)		7.2			(9.1	)
International Specialty		2.8			9.6			7.6			15.4
Syndicate 1200		9.8			4.5			18.2			6.2
Run-off Lines		3.7			1.4			3.3			1.0
Total segment income before taxes		34.5			29.0			66.9			54.7
Corporate and Other		(2.7	)		(1.3	)		(7.1	)		(12.0	)
Net realized investment gains (losses)		11.0			(2.7	)		20.5			10.4
Total income before income taxes	$	42.8		$	25.0		$	80.3		$	53.1

The table below presents earned premiums by geographic location for the three and six months ended June 30, 2013 and 2012. For this disclosure, we determine geographic location by the country of domicile of our subsidiaries that write the business and not by the location of insureds or reinsureds from whom the business was generated.

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(in millions)	2013		2012		2013		2012
Bermuda	$	22.1	$	28.6	$	47.9	$	50.9
Brazil		10.0		5.2		20.0		11.7
Malta		0.4		0.1		0.8		0.1
United Kingdom		111.3		75.9		198.3		146.2
United States		183.7		180.4		364.7		358.6
Total earned premiums	$	327.5	$	290.2	$	631.7	$	567.5

The following table represents identifiable assets as of June 30, 2013 and December 31, 2012:

(in millions)	June 30, 2013		December 31, 2012
Excess and Surplus Lines	$	2,223.0	$	2,206.7
Commercial Specialty		1,327.6		1,337.7
International Specialty		773.8		731.8
Syndicate 1200		1,667.8		1,811.4
Run-off Lines		521.9		516.5
Corporate and Other		61.2		84.8
Total	$	6,575.3	$	6,688.9

Included in total assets at June 30, 2013 and December 31, 2012 are $364.7 million and $505.7 million, respectively, in assets associated with trade capital providers.

XML

Share-based Compensation

6 Months Ended

Jun. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-based Compensation

9. Share-based Compensation

The fair value method of accounting is used for equity-based compensation plans. Under the fair value method, compensation cost is measured based on the fair value of the award at the measurement date and recognized over the requisite service period. We use the Black-Scholes model to estimate the fair values on the measurement date for share options and share appreciation rights (“SARs”). The Black-Scholes model uses several assumptions to value a share award. The volatility assumption is based on the historical change in Argo Group’s stock price over the previous five years preceding the measurement date. The risk-free rate of return assumption is based on the five-year U.S. Treasury constant maturity rate on the measurement date. The expected award life is based upon the average holding period over the history of the incentive plan. The following table summarizes the assumptions we used for the six months ended June 30, 2013 and 2012:

	2013			2012
Risk-free rate of return		1.45	%		1.09	%
Expected dividend yields		1.67	%		1.67	%
Expected award life (years)		5.02			5.03
Expected volatility		31.9	%		32.6	%

All outstanding awards were adjusted to reflect the 10% stock dividend, resulting in a 10% increase to the number of awards outstanding and a 9.09% reduction in the exercise price.

Argo Group’s 2007 Long-Term Incentive Plan

In November 2007, the shareholders of Argo Group approved the 2007 Long-Term Incentive Plan (the “2007 Plan”), which provides for an aggregate of 4.5 million shares of our common stock that may be issued to executives, non-employee directors and other key employees. The share awards may be in the form of share options, SARs, restricted shares, restricted share units, performance units, performance shares or other share-based incentive awards. Shares issued under this plan may be shares that are authorized and unissued or shares that we reacquired, including shares purchased on the open market. Share options and SARs will count as one share for the purposes of the limits under the 2007 Plan; restricted shares, restricted share units, performance units, performance shares or other share-based incentive awards which settle in common shares will count as 2.75 shares for purpose of the limits under the 2007 Plan.

Share options may be in the form of incentive share options, non-qualified share options and restorative options. Share options are required to have an exercise price that is not less than the market value on the date of grant. The term of the share options cannot exceed seven years from the grant date.

A summary of option activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		418,325		$	33.56
Granted		0		$	0.00
Exercised		(52,803	)	$	32.16
Expired or forfeited		(44,830	)	$	34.22
Outstanding at June 30, 2013		320,692		$	33.69

Options outstanding under this plan vested over a one to five year period, subject to continued employment. As of December 31, 2012, all options under this plan were fully vested. Expense recognized under this plan for share options was $0.5 million for the six months ended June 30, 2012. Compensation expense from all equity-based compensation awards is included in “Underwriting, acquisition and insurance expense” in the accompanying Consolidated Statements of Income.

A summary of restricted share activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		236,139		$	29.76
Granted		115,288		$	37.86
Vested and issued		(53,034	)	$	30.36
Expired or forfeited		(8,769	)	$	31.39
Outstanding at June 30, 2013		289,624		$	33.10

The restricted shares will vest over two to four years. Expense recognized under this plan for the restricted shares was $1.6 million and $0.8 million for the six months ended June 30, 2013 and 2012, respectively. As of June 30, 2013, there was $7.9 million of total unrecognized compensation cost related to restricted shares.

A summary of stock-settled SARs activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,261,557		$	27.04
Granted		332,004		$	37.21
Exercised		(99,085	)	$	29.26
Expired or forfeited		(124,794	)	$	26.40
Outstanding at June 30, 2013		1,369,682		$	29.35

The stock-settled SARs vest over a one to four year period. Upon exercise of the stock-settled SARs, the employee is entitled to receive shares of our common stock equal to the appreciation of the stock as compared to the exercise price. Expense recognized for the stock-settled SARs was $1.3 and $1.2 million for each of the six months ended June 30, 2013 and 2012. As of June 30, 2013, there was $5.6 million of total unrecognized compensation cost related to stock-settled SARs.

A summary of cash-settled SARs activity under the 2007 Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,886,124		$	27.35
Granted		556,598		$	37.00
Exercised		(292,189	)	$	28.85
Expired or forfeited		(119,178	)	$	25.62
Outstanding at June 30, 2013		2,031,355		$	30.15

The cash-settled SARs vest over a one to four year period. Upon exercise of the cash-settled SARs, the employee is entitled to receive cash payment for the appreciation in the value of our common stock over the exercise price. We are accounting for the cash-settled SARs as liability awards, which require the awards to be revalued at each reporting period. Expense recognized for the cash-settled SARs was $11.0 million and $1.0 million for the six months ended June 30, 2013 and 2012, respectively. As of June 30, 2013, there was $14.0 million of total unrecognized compensation cost related to cash-settled SARs.

Argo Group International Holdings Ltd. Deferred Compensation Plan for Non-Employee Directors

In February 2008, the Board of Directors approved the Argo Group International Holdings, Ltd. Deferred Compensation Plan for Non-Employee Directors (“Directors Plan”), a non-funded and non-qualified deferred compensation plan. Under the Directors Plan, non-employee directors can elect each year to defer payment of 50% or 100% of their cash compensation payable during the next calendar year. During the time that the cash compensation amounts are deferred, such amounts are credited with interest earned at a rate two percent above the prime rate, to be re-set each May 1. In addition, the Directors Plan calls for us to grant a match equal to 75% of the cash compensation amounts deferred in the form of “Stock Units,” which provide directors with the economic equivalent of stock ownership and are credited as a bookkeeping entry to each director’s “Stock Unit Account.” Each Stock Unit is valued at the closing price of our common stock on the national exchange on which it is listed as of the date credited for all purposes under the Directors Plan and fluctuates daily thereafter on that same basis. Distributions from the Directors Plan will occur six months after the non-employee director ceases to be a member of the Board due to retirement or termination without cause or change in control, or immediately upon disability or death. The non-employee directors are responsible for all tax requirements on the deferred compensation and any related earnings. The Directors Plan provides for a Stock Unit Account to be established for each non-employee director upon their election to the Board and credits their account with an initial bookkeeping entry for 1,650 Stock Units. Under the Directors Plan, we recorded compensation expense of $1.2 million and $0.5 million for the six months ended June 30, 2013 and 2012, respectively.

Argonaut Group’s Amended and Restated Stock Incentive Plan

Argonaut Group, Inc.’s Amended and Restated Stock Incentive Plan, as approved by the shareholders (the “Amended Plan”), provided for an aggregate of up to 6,250,000 shares of our common stock that may be issued to certain executives and other key employees. The stock awards were issued in the form of non-qualified stock options and non-vested stock.

A summary of option activity under the Amended Plan as of June 30, 2013, and changes during the six months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		210,097		$	33.13
Granted		0		$	0.00
Exercised		(90,368	)	$	29.04
Expired or forfeited		(38,415	)	$	48.71
Outstanding at June 30, 2013		81,314		$	30.33

All options granted under the Amended Plan were fully vested in August 2011.

XML

Underwriting, Acquisition and Insurance Expenses - Underwriting, Acquisition and Insurance Expenses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Income And Expenses [Abstract]
Commissions	$ 65.6	$ 51.3	$ 117.5	$ 100.7
General expenses	66.7	61.5	135.4	122.0
Premium taxes, boards and bureaus	6.1	6.0	12.9	12.1
Underwriting Acquisition and Insurance Expenses, Total	138.4	118.8	265.8	234.8
Net (deferral) amortization of policy acquisition costs	(13.8)	(4.2)	(14.5)	(6.5)
Total underwriting, acquisition and insurance expenses	$ 124.6	$ 114.6	$ 251.3	$ 228.3

XML

Information Provided in Connection with Outstanding Debt of Subsidiaries

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Information Provided in Connection with Outstanding Debt of Subsidiaries

16. Information Provided in Connection with Outstanding Debt of Subsidiaries

In September 2012, through our wholly owned subsidiary Argo Group US, Inc. (“Argo Group US”), we issued $143,750,000 aggregate principal amount of Argo Group US’s 6.5% Senior Notes due September 15, 2042 (the “Notes”). The Notes bear interest at 6.5%, payable quarterly in cash in arrears on the 15th day of March, June, September and December of each year, beginning on December 15, 2012. The Notes are unsecured and unsubordinated obligations of Argo Group US and rank equally in right of payment with all of Argo Group US’s other unsecured and unsubordinated debt. The Notes are guaranteed on a full and unconditional senior unsecured basis by Argo Group. The Notes may be redeemed, for cash, in whole or in part, on or after September 15, 2017, at Argo Group US’s option, at any time and from time to time, prior to maturity at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued but unpaid interest on the principal amount being redeemed to, but not including, the redemption date.

The following tables present condensed consolidating financial information at June 30, 2013 and December 31, 2012 and for the three and six months ended June 30, 2013 and 2012, for Argo Group (the “Parent Guarantor”) and Argo Group US (the “Subsidiary Issuer”). The Subsidiary Issuer is an indirect 100 percent-owned subsidiary of the Parent

Guarantor. Investments in subsidiaries are accounted for by the Parent Guarantor under the equity method for purposes of the supplemental consolidating presentation. Earnings of subsidiaries are reflected in the Parent Guarantor’s investment accounts and earnings. The Parent Guarantor fully and unconditionally guarantees certain of the debt of the Subsidiary Issuer. Condensed consolidating financial information of the Subsidiary Issuer is presented on a consolidated basis and consists principally of the net assets, results of operations, and cash flows of operating insurance company subsidiaries.

CONDENSED CONSOLIDATING BALANCE SHEET

June 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US,  Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Assets
Investments	$	(3.8	)	$	2,715.8	$	1,273.4		$	0.0		$	3,985.4
Cash		0.0			83.8		18.2			0.0			102.0
Premiums receivable		0.0			158.4		290.2			0.0			448.6
Reinsurance recoverables		0.0			1,179.3		70.4			0.0			1,249.7
Goodwill and other intangible assets		0.0			138.4		104.1			0.0			242.5
Current income taxes receivable, net		0.0			4.5		4.4			0.0			8.9
Deferred acquisition costs, net		0.0			54.0		57.9			0.0			111.9
Ceded unearned premiums		0.0			92.2		147.5			0.0			239.7
Other assets		5.8			115.2		65.6			0.0			186.6
Due from affiliates		0.0			1.6		(1.6	)		0.0			0.0
Intercompany note receivable		0.0			121.1		(121.1	)		0.0			0.0
Investments in subsidiaries		1,616.4			0.0		0.0			(1,616.4	)		0.0
Total assets	$	1,618.4		$	4,664.3	$	1,909.0		$	(1,616.4	)	$	6,575.3
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0		$	2,209.6		1,024.3		$	0.0		$	3,233.9
Unearned premiums		0.0			422.0		387.7			0.0			809.7
Funds held and ceded reinsurance payable, net		0.0			617.9		(165.2	)		0.0			452.7
Long-term debt		49.0			288.9		63.2			0.0			401.1
Current income taxes payable, net		0.0			0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0			19.4		9.6			0.0			29.0
Accrued underwriting expenses and other liabilities		14.9			92.0		50.9			0.0			157.8
Due to affiliates		(6.1	)		0.0		0.0			6.1			0.0
Intercompany note payable		69.5			0.0		0.0			(69.5	)		0.0
Total liabilities		127.3			3,649.8		1,370.5			(63.4	)		5,084.2
Total shareholders’ equity		1,491.1			1,014.5		538.5			(1,553.0	)		1,491.1
Total liabilities and shareholders’ equity	$	1,618.4		$	4,664.3	$	1,909.0		$	(1,616.4	)	$	6,575.3

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING BALANCE SHEET

December 31, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Assets
Investments	$	(0.9	)	$	2,794.7	$	1,406.9		$	0.0		$	4,200.7
Cash		0.0			73.9		21.9			0.0			95.8
Premiums receivable		0.0			155.1		205.9			0.0			361.0
Reinsurance recoverables		0.0			1,155.1		165.8			0.0			1,320.9
Goodwill and other intangible assets		0.0			139.5		105.8			0.0			245.3
Current income taxes receivable, net		0.0			8.7		4.2			0.0			12.9
Deferred acquisition costs, net		0.0			54.6		44.8			0.0			99.4
Ceded unearned premiums		0.0			85.9		107.7			0.0			193.6
Other assets		4.3			104.0		51.0			0.0			159.3
Due from affiliates		5.0			1.2		(1.2	)		(5.0	)		0.0
Intercompany note receivable		0.0			119.6		(119.6	)		0.0			0.0
Investments in subsidiaries		1,621.1			0.0		0.0			(1,621.1	)		0.0
Total assets	$	1,629.5		$	4,692.3	$	1,993.2		$	(1,626.1	)	$	6,688.9
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0		$	2,226.3	$	997.2		$	0.0		$	3,223.5
Unearned premiums		0.0			415.6		314.6			0.0			730.2
Funds held and ceded reinsurance payable, net		0.0			598.4		47.4			0.0			645.8
Long-term debt		49.0			288.9		63.0			0.0			400.9
Current income taxes payable, net		0.0			0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0			36.8		7.0			0.0			43.8
Accrued underwriting expenses and other liabilities		11.3			84.1		35.2			0.0			130.6
Due to affiliates		0.0			0.0		0.0			0.0			0.0
Intercompany note payable		55.1			0.0		0.0			(55.1	)		0.0
Total liabilities		115.4			3,650.1		1,464.4			(55.1	)		5,174.8
Total shareholders’ equity		1,514.1			1,042.2		528.8			(1,571.0	)		1,514.1
Total liabilities and shareholders’ equity	$	1,629.5		$	4,692.3	$	1,993.2		$	(1,626.1	)	$	6,688.9

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF INCOME

FOR THE THREE MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	108.3		$	219.2		$	0.0		$	327.5
Net investment income		0.0			19.6			6.0			(0.3	)		25.3
Fee income, net		0.0			(1.0	)		1.2			0.0			0.2
Net realized investment gains		0.0			18.0			(7.0	)		0.0			11.0
Total revenue		0.0			144.9			219.4			(0.3	)		364.0
Expenses:
Losses and loss adjustment expenses		0.0			64.7			128.0			0.0			192.7
Other reinsurance-related expenses		0.0			1.4			3.3			0.0			4.7
Underwriting, acquisition and insurance expenses		6.3			43.5			74.8			0.0			124.6
Interest expense		0.8			3.9			0.7			(0.3	)		5.1
Foreign currency exchange (gain) loss		0.1			0.0			(6.0	)		0.0			(5.9	)
Total expenses		7.2			113.5			200.8			(0.3	)		321.2
(Loss) income before income taxes		(7.2	)		31.4			18.6			0.0			42.8
Provision for income taxes		0.0			8.4			2.7			0.0			11.1
Net (loss) income before equity in earnings of subsidiaries		(7.2	)		23.0			15.9			0.0			31.7
Equity in undistributed earnings of subsidiaries		38.9			0.0			0.0			(38.9	)		0.0
Net income	$	31.7		$	23.0		$	15.9		$	(38.9	)	$	31.7

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF (LOSS) INCOME

FOR THE THREE MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	109.9		$	180.3		$	0.0		$	290.2
Net investment income		0.0			22.3			7.7			0.0			30.0
Fee income, net		0.0			(0.2	)		0.7			0.0			0.5
Net realized investment gains		0.0			(2.1	)		(0.6	)		0.0			(2.7	)
Total revenue		0.0			129.9			188.1			0.0			318.0
Expenses:
Losses and loss adjustment expenses		0.0			74.4			101.4			0.0			175.8
Other reinsurance-related expenses		0.0			0.0			6.9			0.0			6.9
Underwriting, acquisition and insurance expenses		7.6			42.9			64.1			0.0			114.6
Interest expense		1.0			3.8			0.7			0.0			5.5
Foreign currency exchange (gain) loss		0.0			0.3			(10.1	)		0.0			(9.8	)
Total expenses		8.6			121.4			163.0			0.0			293.0
Income (loss) before income taxes		(8.6	)		8.5			25.1			0.0			25.0
Provision for income taxes		0.0			0.9			0.1			0.0			1.0
Net income (loss) before equity in losses of subsidiaries		(8.6	)		7.6			25.0			0.0		$	24.0
Equity in undistributed losses of subsidiaries		32.6			0.0			0.0			(32.6	)		0.0
Net income	$	24.0		$	7.6		$	25.0		$	(32.6	)	$	24.0

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF INCOME

FOR THE SIX MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	216.0		$	415.7		$	0.0		$	631.7
Net investment income		0.0			40.5			13.3			(0.6	)		53.2
Fee income, net		0.0			(1.3	)		1.5			0.0			0.2
Net realized investment gains		0.0			25.6			(5.1	)		0.0			20.5
Total revenue		0.0			280.8			425.4			(0.6	)		705.6
Expenses:
Losses and loss adjustment expenses		0.0			129.0			234.2			0.0			363.2
Other reinsurance-related expenses		0.0			2.9			6.9			0.0			9.8
Underwriting, acquisition and insurance expenses		12.5			92.2			146.6			0.0			251.3
Interest expense		1.6			7.6			1.4			(0.6	)		10.0
Foreign currency exchange (gain) loss		0.0			0.2			(9.2	)		0.0			(9.0	)
Total expenses		14.1			231.9			379.9			(0.6	)		625.3
(Loss) income before income taxes		(14.1	)		48.9			45.5			0.0			80.3
Provision for income taxes		0.0			11.6			4.3			0.0			15.9
Net (loss) income before equity in earnings of subsidiaries		(14.1	)		37.3			41.2			0.0			64.4
Equity in undistributed earnings of subsidiaries		78.5			0.0			0.0			(78.5	)		0.0
Net income	$	64.4		$	37.3		$	41.2		$	(78.5	)	$	64.4

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF (LOSS) INCOME

FOR THE SIX MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)		Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Premiums and other revenue:
Earned premiums	$	0.0		$	218.8	$	348.7		$	0.0		$	567.5
Net investment income		0.0			44.2		17.2			0.0			61.4
Fee income, net		0.0			0.0		1.8			0.0			1.8
Net realized investment gains		0.0			7.5		2.9			0.0			10.4
Total revenue		0.0			270.5		370.6			—			641.1
Expenses:
Losses and loss adjustment expenses		0.0			142.9		198.7			0.0			341.6
Other reinsurance-related expenses		0.0			0.0		13.8			0.0			13.8
Underwriting, acquisition and insurance expenses		14.7			86.1		127.5			0.0			228.3
Interest expense		1.9			7.6		1.7			0.0			11.2
Foreign currency exchange (gain) loss		0.0			0.2		(7.1	)		0.0			(6.9	)
Total expenses		16.6			236.8		334.6			0.0			588.0
Income (loss) before income taxes		(16.6	)		33.7		36.0			0.0			53.1
Provision for income taxes		0.0			7.9		1.6			0.0			9.5
Net income (loss) before equity in losses of subsidiaries		(16.6	)		25.8		34.4			0.0		$	43.6
Equity in undistributed losses of subsidiaries		60.2			0.0		0.0			(60.2	)		0.0
Net income	$	43.6		$	25.8	$	34.4		$	(60.2	)	$	43.6

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE SIX MONTHS ENDED JUNE 30, 2013

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Net cash flows from operating activities	$	(7.4	)	$	(3.4	)	$	(85.4	)	$	0.0		$	(96.2	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			433.8			486.1			0.0			919.9
Proceeds from maturities and mandatory calls of investments		0.0			160.9			50.0			0.0			210.9
Purchases of investments		0.0			(538.6	)		(387.7	)		0.0			(926.3	)
Change in short-term investments and foreign regulatory deposits		0.0			(12.8	)		(35.7	)		0.0			(48.5	)
Settlements of foreign currency exchange forward contracts		(0.1	)		0.0			(2.6	)		0.0			(2.7	)
Issuance of intercompany note, net		0.0			0.0			(14.0	)		14.0			0.0
Other, net		(0.1	)		0.9			(14.2	)		0.0			(13.4	)
Cash provided (used) by investing activities		(0.2	)		44.2			81.9			14.0			139.9
Cash flows from financing activities:
Borrowings under intercompany note, net		14.0			0.0			0.0			(14.0	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		0.0			0.0			0.0			0.0			0.0
Activity under stock incentive plans		1.4			0.0			0.1			0.0			1.5
Repurchase of Company’s common shares		0.0			(30.9	)		0.0			0.0			(30.9	)
Excess tax expense from share-based payment arrangements		0.0			0.0			0.0			0.0			0.0
Payment of cash dividend to common shareholders		(7.8	)		0.0			0.0			0.0			(7.8	)
Cash provided (used) by financing activities		7.6			(30.9	)		0.1			(14.0	)		(37.2	)
Effect of exchange rate changes on cash		0.0			0.0			(0.3	)		0.0			(0.3	)
Change in cash		0.0			9.9			(3.7	)		0.0			6.2
Cash, beginning of period		0.0			73.9			21.9			0.0			95.8
Cash, end of period	$	0.0		$	83.8		$	18.2		$	0.0		$	102.0

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE SIX MONTHS ENDED JUNE 30, 2012

(in millions)

	Argo Group International Holdings, Ltd (Parent Guarantor)			Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer)			Other Subsidiaries and Eliminations (1)			Consolidating Adjustments  (2)			Total
Net cash flows from operating activities	$	(15.3	)	$	(26.8	)	$	13.7		$	0.0		$	(28.4	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			391.2			344.4			0.0			735.6
Proceeds from maturities and mandatory calls of investments		0.0			126.8			79.1			0.0			205.9
Purchases of investments		0.0			(503.3	)		(363.3	)		0.0			(866.6	)
Change in short-term investments and foreign regulatory deposits		(0.1	)		43.9			(60.0	)		0.0			(16.2	)
Settlements of foreign currency exchange forward contracts		2.4			0.0			(3.2	)		0.0			(0.8	)
Issuance of intercompany note, net		0.0			(10.0	)		(9.1	)		19.1			0.0
Other, net		0.0			(15.3	)		(4.2	)		0.0			(19.5	)
Cash provided (used) by investing activities		2.3			33.3			(16.3	)		19.1			38.4
Cash flows from financing activities:
Borrowings under intercompany note, net		19.1			0.0			0.0			(19.1	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		0.0			0.0			0.0			0.0			0.0
Activity under stock incentive plans		0.2			0.0			0.0			0.0			0.2
Repurchase of Company’s common shares		0.0			(27.8	)		0.0			0.0			(27.8	)
Excess tax expense from share-based payment arrangements		0.0			0.0			0.0			0.0			0.0
Payment of cash dividend to common shareholders		(6.3	)		0.0			0.1			0.0			(6.2	)
Cash (used) provided by financing activities		13.0			(27.8	)		0.1			(19.1	)		(33.8	)
Effect of exchange rate changes on cash		0.0			0.0			(1.3	)		0.0			(1.3	)
Change in cash		0.0			(21.3	)		(3.8	)		0.0			(25.1	)
Cash, beginning of period		0.0			85.1			15.8			0.0			100.9
Cash, end of period	$	0.0		$	63.8		$	12.0		$	0.0		$	75.8

⁽¹⁾  Includes all other subsidiaries of Argo Group International Holdings, Ltd. and all intercompany eliminations

⁽²⁾  Includes all Argo Group parent company eliminations

XML

Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

14. Supplemental Cash Flow Information

Income taxes paid. We paid income taxes of $5.0 million and $13.1 million during the three and six months ended June 30, 2013 and 2012, respectively.

Interest paid. Interest paid for the six months ended June 30, was as follows:

	For the Six Months Ended June 30,
(in millions)	2013		2012
Senior unsecured fixed rate notes	$	4.7	$	0.0
Junior subordinated debentures		3.8		9.4
Other indebtedness		0.5		1.6
Revolving credit facility		0.0		0.0
Total interest paid	$	9.0	$	11.0

XML

Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Jul. 31, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	AGII
Entity Registrant Name	Argo Group International Holdings, Ltd.
Entity Central Index Key	0001091748
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		26,663,066

XML

Disclosures about Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Disclosures about Fair Value of Financial Instruments

15. Disclosures about Fair Value of Financial Instruments

Cash. The carrying amount approximates fair value.

Investment securities and short-term investments. See Note 3, “Investments,” for additional information.

Premiums receivable and reinsurance recoverables on paid losses. The carrying value of current receivables approximates fair value. At June 30, 2013 and December 31, 2012, the carrying values of premiums receivable over 90 days were $23.2 million and $24.3 million, respectively. Included in “Reinsurance recoverables” in the

Consolidated Balance Sheets at June 30, 2013 and December 31, 2012, are amounts that are due from third party trade capital providers associated with the operations of Argo Underwriting Agency Limited (“Argo International”). Upon settlement, the receivable is offset against the liability also reflected in the accompanying Consolidated Balance Sheets. At June 30, 2013 and December 31, 2012, the payable was in excess of the receivable. Of our paid losses on reinsurance recoverable balances, excluding amounts attributable to Argo International’s third party trade capital providers, at June 30, 2013 and December 31, 2012, the carrying values over 90 days were $17.1 million and $18.0 million, respectively. Our methodology for establishing our allowances for doubtful accounts includes specifically identifying all potential uncollectible balances regardless of aging. Any of the over 90 day balances, where collectability was deemed questionable, have been included in the allowances. At June 30, 2013 and December 31, 2012, the allowance for doubtful accounts for premiums receivable was $3.5 million and $2.5 million, respectively. The allowance for doubtful accounts for reinsurance recoverables on paid losses was $2.3 million and $2.2 million at June 30, 2013 and December 31, 2012, respectively. Premiums receivable over 90 days were secured by collateral in the amount of $0.7 million and $0.4 million at June 30, 2013 and December 31, 2012, respectively. Reinsurance recoverables on paid losses over 90 days were secured by collateral in the amount of $0.3 million at both June 30, 2013 and December 31, 2012.

At June 30, 2013 and December 31, 2012, the fair value of our Junior Subordinated Debentures, Senior unsecured fixed rate notes, and other indebtedness was estimated using appropriate market indices or quoted prices from external sources based on current market conditions.

A summary of our financial instruments whose carrying value did not equal fair value at June 30, 2013 and December 31, 2012 is shown below:

	June 30, 2013				December 31, 2012
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Junior subordinated debentures	$	193.3	$	155.2	$	193.3	$	151.8
Senior unsecured fixed rate notes		143.8		141.2		143.8		143.2
Other indebtedness:
Floating rate loan stock		63.2		50.7		63.0		49.5
Note payable		0.8		0.6		0.8		0.6
	$	401.1	$	347.7	$	400.9	$	345.1

XML

Share-based Compensation - Summary of Restricted Share Units Activity Under 2007 Plan (Detail) (Restricted Share Units [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	236,139
Granted, Shares	115,288
Vested and issued, Shares	(53,034)
Expired or forfeited, Shares	(8,769)
Shares, Outstanding at June 30, 2013	289,624
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 29.76
Granted, Weighted-Average Grant Date Fair Value	$ 37.86
Vested and issued, Weighted-Average Grant Date Fair Value	$ 30.36
Expired or forfeited, Weighted-Average Grant Date Fair Value	$ 31.39
Weighted-Average Exercise Price, Outstanding at June 30, 2013	$ 33.10

XML

Share-based Compensation - Summary of Option Activity (Detail) (2007 Plan [Member], USD $)	6 Months Ended
	Jun. 30, 2013
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	418,325
Granted, Shares	0
Exercised, shares	(52,803)
Expired or forfeited, Shares	(44,830)
Shares, Outstanding at June 30, 2013	320,692
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 33.56
Granted, Weighted-Average Exercise Price	$ 0.00
Exercised, Weighted-Average Exercise Price	$ 32.16
Expired or forfeited, Weighted-Average Exercise Price	$ 34.22
Weighted-Average Exercise Price, Outstanding at June 30, 2013	$ 33.69