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 March 31, 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 May 1, 2013.

Title	Outstanding
Common Shares, par value $1.00 per share	24,710,402

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

INDEX

PART I.	FINANCIAL INFORMATION	3
Item 1.	Consolidated Financial Statements (unaudited)
	Consolidated Balance Sheets as of March 31, 2013 and December 31, 2012	3
	Consolidated Statements of Income for the three months ended March 31, 2013 and 2012	4
	Consolidated Statements of Comprehensive Income for the three months ended March 31, 2013 and 2012	5
	Consolidated Statements of Cash Flows for the three months ended March 31, 2013 and 2012	6
	Notes to Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	43
Item 4.	Controls and Procedures	45
PART II.	OTHER INFORMATION	46
Item 1.	Legal Proceedings	46
Item 1a.	Risk Factors	46
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	46
Item 3.	Defaults Upon Senior Securities	46
Item 4.	Mine Safety Disclosures	46
Item 5.	Other Information	46
Item 6.	Exhibits	47

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)

	March 31, 2013			December 31, 2012*
	(Unaudited)
Assets
Investments:
Fixed maturities, at fair value:
Available-for-sale (cost: 2013 - $2,839.9; 2012 - $2,993.1)	$	2,972.6		$	3,154.0
Equity securities, at fair value (cost: 2013 - $415.3; 2012 - $383.5)		609.2			531.4
Other investments (cost: 2013 - $315.3; 2012 - $284.8)		317.4			281.0
Short-term investments, at fair value (cost: 2013 - $234.2; 2012 - $234.3)		234.0			234.3
Total investments		4,133.2			4,200.7
Cash		91.2			95.8
Accrued investment income		26.9			30.3
Premiums receivable		365.6			361.0
Reinsurance recoverables		1,240.8			1,320.9
Goodwill		153.8			153.8
Intangible assets, net of accumulated amortization		90.0			91.5
Current income taxes receivable, net		13.6			12.9
Deferred acquisition costs, net		100.6			99.4
Ceded unearned premiums		230.9			193.6
Other assets		155.9			129.0
Total assets	$	6,602.5		$	6,688.9
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	3,205.0		$	3,223.5
Unearned premiums		737.3			730.2
Accrued underwriting expenses		115.8			105.0
Ceded reinsurance payable, net		475.4			612.1
Funds held		37.2			33.7
Senior unsecured fixed rate notes		143.8			143.8
Other indebtedness		64.4			63.8
Junior subordinated debentures		193.3			193.3
Deferred tax liabilities, net		57.3			43.8
Other liabilities		26.4			25.6
Total liabilities		5,055.9			5,174.8
Shareholders’ equity:
Common shares - $1.00 par, 500,000,000 shares authorized; 31,463,460 and 31,384,271 shares issued at March 31, 2013 and December 31, 2012, respectively		31.5			31.4
Additional paid-in capital		725.5			722.7
Treasury shares (6,785,438 and 6,459,613 shares at March 31, 2013 and December 31, 2012, respectively)		(217.8	)		(205.5	)
Retained earnings		804.9			776.0
Accumulated other comprehensive income, net of taxes		202.5			189.5
Total shareholders’ equity		1,546.6			1,514.1
Total liabilities and shareholders’ equity	$	6,602.5		$	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 March 31,
	2013			2012
Premiums and other revenue:
Earned premiums	$	304.2		$	277.3
Net investment income		27.9			31.4
Fee income, net		0.0			1.3
Net realized investment gains		9.5			13.1
Total revenue		341.6			323.1
Expenses:
Losses and loss adjustment expenses		170.5			165.8
Other reinsurance-related expenses		5.1			6.9
Underwriting, acquisition and insurance expenses		126.7			113.7
Interest expense		4.9			5.7
Foreign currency exchange (gain) loss		(3.1	)		2.9
Total expenses		304.1			295.0
Income before income taxes		37.5			28.1
Provision for income taxes		4.8			8.5
Net income	$	32.7		$	19.6
Net income per common share:
Basic	$	1.32		$	0.75
Diluted	$	1.28		$	0.74
Dividend declared per common share:	$	0.15		$	0.12
Weighted average common shares:
Basic		24,768,904			26,177,410
Diluted		25,596,237			26,482,309
	For the Three Months Ended March 31,
	2013			2012
Net Realized investment gains before other-than-temporary impairment losses	$	14.3		$	13.2
Other-than-temporary impairment losses recognized in earnings
Other-than-temporary impairment losses on equity securities		(1.4	)		(0.1	)
Other-than-temporary impairment losses on other investments		(3.4	)		0.0
Impairment losses recognized in earnings		(4.8	)		(0.1	)
Net realized investment gains	$	9.5		$	13.1

See accompanying notes.

4

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in millions)

(Unaudited)

	For the Three Months Ended March 31,
	2013			2012
Net income	$	32.7		$	19.6
Other comprehensive income:
Foreign currency translation adjustments		0.0			1.1
Unrealized gains on securities:
Gains arising during the period		24.2			52.4
Reclassification adjustment for gains included in net income		(0.7	)		(5.4	)
Other comprehensive income before tax		23.5			48.1
Income tax provision related to other comprehensive income:
Unrealized gains on securities:
Gains arising during the period		10.4			14.2
Reclassification adjustment for gains included in net income		0.1			(1.6	)
Income tax provision related to other comprehensive income		10.5			12.6
Other comprehensive income, net of tax		13.0			35.5
Comprehensive income	$	45.7		$	55.1

See accompanying notes.

5

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in millions)

(Unaudited)

	For the Three Months Ended March 31,
	2013			2012
Cash flows from operating activities:
Net income	$	32.7		$	19.6
Adjustments to reconcile net income to net cash used by operating activities:
Amortization and depreciation		9.7			8.4
Share-based payments expense		8.6			2.6
Excess tax expense from share-based payment arrangements		0.0			0.0
Deferred income tax provision, net		3.0			4.9
Net realized investment gains		(9.5	)		(13.1	)
Change in:
Accrued investment income		3.4			2.0
Receivables		77.1			136.3
Deferred acquisition costs		(0.4	)		(0.6	)
Ceded unearned premiums		(37.3	)		(39.6	)
Reserves for losses and loss adjustment expenses		(17.8	)		(36.9	)
Unearned premiums		7.1			3.8
Ceded reinsurance payable and funds held		(133.2	)		(90.2	)
Income taxes		(0.7	)		(5.0	)
Accrued underwriting expenses		2.2			3.2
Other, net		(28.9	)		(1.4	)
Cash used by operating activities		(84.0	)		(6.0	)
Cash flows from investing activities:
Sales of fixed maturity investments		425.3			400.7
Maturities and mandatory calls of fixed maturity investments		115.1			106.5
Sales of equity securities		5.6			1.8
Sales of other investments		5.3			2.3
Purchases of fixed maturity investments		(378.0	)		(445.5	)
Purchases of equity securities		(38.3	)		(55.2	)
Purchases of other investments		(26.5	)		(7.7	)
Change in foreign regulatory deposits and voluntary pools		(1.2	)		1.3
Change in short-term investments		(5.2	)		16.4
Settlements of foreign currency exchange forward contracts		(1.9	)		(0.6	)
Purchases of fixed assets		(4.2	)		(9.2	)
Other, net		(1.3	)		(4.3	)
Cash provided by investing activities		94.7			6.5
Cash flows from financing activities:
Activity under stock incentive plans		1.3			0.0
Repurchase of Company’s common shares		(12.9	)		(9.3	)
Excess tax expense from share-based payment arrangements		0.0			0.0
Payment of cash dividend to common shareholders		(3.7	)		(3.1	)
Cash used by financing activities		(15.3	)		(12.4	)
Effect of exchange rate changes on cash		0.0			0.3
Change in cash		(4.6	)		(11.6	)
Cash, beginning of period		95.8			102.7
Cash, end of period	$	91.2		$	91.1

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 months ended, March 31, 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. Certain amounts applicable to prior periods have been reclassified to conform to the presentation followed as of March 31, 2013.

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 is 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 is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is 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. We do not anticipate that this update will have an impact on our financial results and disclosures.

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 are 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 March 31, 2013 and December 31, 2012 were as follows:

March 31, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	354.3	$	6.5	$	0.0	$	360.8
Non-U.S. Governments		54.5		1.8		0.6		55.7
Obligations of states and political subdivisions		614.7		43.9		1.0		657.6
Credit-Financial		356.5		23.8		0.5		379.8
Credit-Industrial		394.3		26.7		0.9		420.1
Credit-Utility		181.3		11.6		0.5		192.4
Structured securities:
CMO/MBS-agency (1)		331.8		17.6		0.4		349.0
CMO/MBS-non agency		11.3		1.2		0.0		12.5
CMBS (2)		113.1		4.7		0.2		117.6
ABS-residential (3)		9.1		0.3		0.7		8.7
ABS-non residential		92.1		1.2		0.0		93.3
Foreign denominated:
Governments		203.3		4.5		6.6		201.2
Credit		123.6		3.6		3.3		123.9
Total fixed maturities		2,839.9		147.4		14.7		2,972.6
Equity securities		415.3		197.4		3.5		609.2
Other investments		315.3		2.9		0.8		317.4
Short-term investments		234.2		0.0		0.2		234.0
Total investments	$	3,804.7	$	347.7	$	19.2	$	4,133.2
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 March 31, 2013 and December 31, 2012 is $103.7 million and $143.9 million, respectively, of assets 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 March 31, 2013, by contractual maturity, were as follows:

(in millions)	Amortized Cost		Fair Value
Due in one year or less	$	213.0	$	215.4
Due after one year through five years		1,117.7		1,150.6
Due after five years through ten years		714.3		776.4
Thereafter		237.5		249.1
Structured securities		557.4		581.1
Total	$	2,839.9	$	2,972.6

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 March 31, 2013 and December 31, 2012 is presented below:

March 31, 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 (1)	$	15.6		$	0.0	$	0.0	$	0.0	$	15.6		$	0.0
Non-U.S. Governments (2)		20.0			0.6		0.2		0.0		20.2			0.6
Obligations of states and political subdivisions		55.7			0.9		0.8		0.1		56.5			1.0
Credit-Financial		24.1			0.1		1.7		0.4		25.8			0.5
Credit-Industrial		43.5			0.8		0.9		0.1		44.4			0.9
Credit-Utility		15.0			0.3		0.8		0.2		15.8			0.5
Structured securities:
CMO/MBS-agency (2)		25.0			0.4		1.0		0.0		26.0			0.4
CMBS		16.3			0.2		0.0		0.0		16.3			0.2
ABS-residential		0.0			0.0		4.7		0.7		4.7			0.7
ABS-non residential (1) (2)		23.2			0.0		0.2		0.0		23.4			0.0
Foreign denominated:
Governments		133.8			6.6		0.0		0.0		133.8			6.6
Credit		108.2			3.3		0.0		0.0		108.2			3.3
Total fixed maturities		480.4			13.2		10.3		1.5		490.7			14.7
Equity securities		40.9			3.5		0.0		0.0		40.9			3.5
Other investments		(0.8	)		0.8		0.0		0.0		(0.8	)		0.8
Short-term investments		0.0			0.2		0.0		0.0		0.0			0.2
Total	$	520.5		$	17.7	$	10.3	$	1.5	$	530.8		$	19.2

⁽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.

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 6,418 securities, of which 1,034 were in an unrealized loss position for less than one year and 33 were in an unrealized loss position for a period one year or greater as of March 31, 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 March 31, 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 did not recognize any other-than-temporary losses on our fixed maturities portfolio for the three months ended March 31, 2013 and 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 $1.4 million and $0.1 million for the three months ended March 31, 2013 and 2012, respectively. We recognized other-than-temporary losses on our other investments of $3.4 million for the three months ended March 31, 2013. We did not recognize any other-than-temporary losses on our other investments in 2012. In situations where we did not recognize any 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.

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Realized Gains and Losses

The following table presents the Company’s gross realized investment gains (losses) for the three months ended March 31:

(in millions)	For the Three Months Ended March 31,
	2013			2012
Realized gains
Fixed maturities	$	11.5		$	8.3
Equity securities		0.5			0.0
Other investments		11.1			11.5
Short-term investments		0.1			0.2
Gross realized gains		23.2			20.0
Realized losses
Fixed maturities		(6.5	)		(2.9	)
Equity securities		0.0			(0.1	)
Other investments		(2.3	)		(3.8	)
Short-term investments		(0.1	)		0.0
Other-than-temporary impairment losses on equity securities		(1.4	)		(0.1	)
Other-than-temporary impairment losses on other investments		(3.4	)		0.0
Gross realized losses		(13.7	)		(6.9	)
Net realized investment gains	$	9.5		$	13.1

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 unrealized gains on bonds of nil and $0.1 million were offset by foreign exchange realized losses on forwards of nil and $0.1 million for the three months ended March 30, 2013 and 2012, respectively, and are reflected in realized gains and losses in the Consolidated Statements of Income and in the table above. As of March 31, 2013 and 2012, we hedged $1.7 million and $3.0 million, respectively, of certain holdings in non-U.S. Dollar denominated fixed maturity investments with $1.5 million and $2.8 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 $73.7 million and $132.8 million as of March 31, 2013 and 2012, respectively. The fair value of the currency forward contracts was a loss of $0.6 million and a loss of $1.4 million as of March 31, 2013 and 2012, respectively. For the three months ended March 31, 2013 and 2012, we recognized $1.6 million and $3.2 million in realized gains and $2.3 million and $3.3 million in realized losses, respectively, from the currency forward contracts.

Regulatory Deposits, Pledged Securities and Letters of Credit

At March 31, 2013, the amortized cost and fair value of investments on deposit for regulatory purposes and reinsurance were $212.8 million and $228.8 million, respectively.

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Investments with an amortized cost of $249.1 million and fair value of $253.2 million were pledged as collateral in support of irrevocable letters of credit at March 31, 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 $64.8 million and $124.9 million for our Corporate member’s capital as security to support the underwriting business at Lloyd’s.

At March 31, 2013, our Corporate member’s capital supporting our Lloyd’s business consisted of:

Letters of credit	$	124.9
Fixed maturities, at fair value		165.5
Short-term investments, at fair value		3.4
Total securities and letters of credit pledged to Lloyd’s	$	293.8

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 March 31, 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.

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• 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.

• 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.

Transfers Between Level 1 and Level 2 Securities: There were no transfers between Level 1 and Level 2 securities during the three month period ended March 31, 2013.

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 valuation is 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. There were no transfers of other investments between Level 1 and Level 2 for the three months ended March 31, 2013.

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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. Included in short-term investments are Funds at Lloyd’s, which represent a portion of our Corporate member’s capital as security to support the underwriting business at Lloyd’s and principally short-term money market accounts. There were no transfers of short-term investments between Level 1 and Level 2 for the three months ended March 31, 2013.

Other Assets Level 3: We have one reinsurance contract deemed a derivative in 2013 and two reinsurance contracts deemed derivatives in 2012. The fair value was 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.

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

(in millions)	March 31, 2013		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	360.8	$	183.4	$	177.4	$	0.0
Non-U.S. Governments		55.7		0.0		55.7		0.0
Obligations of states and political subdivisions		657.6		0.0		657.6		0.0
Credit-Financial		379.8		0.0		379.8		0.0
Credit-Industrial		420.1		0.0		420.1		0.0
Credit-Utility		192.4		0.0		192.4		0.0
Structured securities:
CMO/MBS-agency		349.0		0.0		349.0		0.0
CMO/MBS-non agency		12.5		0.0		12.5		0.0
CMBS		117.6		0.0		117.6		0.0
ABS-residential		8.7		0.0		8.7		0.0
ABS-non residential		93.3		0.0		93.3		0.0
Foreign denominated:
Governments		201.2		0.0		201.2		0.0
Credit		123.9		0.0		123.9		0.0
Total fixed maturities		2,972.6		183.4		2,789.2		0.0
Equity securities		609.2		528.8		78.6		1.8
Other investments		139.2		0.0		139.2		0.0
Short-term investments		234.0		201.7		32.3		0.0
Other assets		3.6		0.0		0.0		3.6
	$	3,958.6	$	913.9	$	3,039.3	$	5.4

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

^(b)  Significant other observable inputs

^(c)  Significant unobservable inputs

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(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 March 31, 2013 and December 31, 2012 are as follows:

(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		0.0		0.0			0.0
Purchases, issuances, sales, and settlements
Purchases		0.0		0.0			0.0
Issuances		0.0		0.0			0.0
Sales		0.0		(3.3	)		(3.3	)
Settlements		0.0		0.0			0.0
Ending balance, March 31, 2013	$	1.8	$	3.6		$	5.4
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 March 31, 2013	$	0.0	$	0.0		$	0.0

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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	)		(2.1	)		(3.5	)
Settlements		0.0			0.0			0.0			0.0
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 March 31, 2013 and December 31, 2012, we did not have any financial assets or financial liabilities measured at fair value on a nonrecurring basis.

4. Shareholders’ Equity

On February 15, 2013 and February 15, 2012, our Board of Directors declared a quarterly cash dividend in the amount of $0.15 and $0.12, respectively, on each share of common stock outstanding. On March 15, 2013 and 2012, we paid $3.7 million and $3.1 million, respectively, to our shareholders of record on March 1, 2013 and 2012, respectively.

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 May 1, 2013, we have repurchased 6,934,145 shares of our common stock at an average price of $32.28 for a total cost of $223.7 million. These shares are being held as treasury shares in accordance with the provisions of the Bermuda Companies Act 1981. As of May 1, 2013, availability under the 2011 Repurchase Authorization for future repurchases of our common shares was $52.6 million.

For the three months ended March 31, 2013, we repurchased a total of 325,825 common shares for $12.3 million. A summary of activity from January 1, 2013 through May 3, 2013 follows.

For the three months ended March 31, 2013, we repurchased 97,600 common shares on the open market for $3.9 million. 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

⁽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.

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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 months ended March 31, 2013 and 2012:

	For the Three Months Ended March 31,
(in millions, except number of shares and per share amounts)	2013		2012
Net income	$	32.7	$	19.6
Weighted average common shares outstanding - basic		24,768,904		26,177,410
Effect of dilutive securities
Equity compensation awards		827,333		304,899
Weighted average common shares outstanding - diluted		25,596,237		26,482,309
Net income per common share - basic	$	1.32	$	0.75
Net income per common share - diluted	$	1.28	$	0.74

Excluded from the weighted average common shares outstanding calculation at March 31, 2013 and 2012 are 6,785,438 shares and 5,310,181 shares, respectively, which are held as treasury shares. The shares are excluded as of their repurchase date. For the three months ended March 31, 2013, equity compensation awards to purchase 214,453 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 2015. For the three months ended March 31, 2012, equity compensation awards to purchase 1,200,366 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 2012 through 2018.

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 months ended March 31, 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			13.8			0.0			13.8
Amounts reclassified from accumulated other comprehensive income		0.0			(0.8	)		0.0			(0.8	)
Net current-period other comprehensive income		0.0			13.0			0.0			13.0
Ending balance, March 31, 2013	$	(8.7	)	$	217.1		$	(5.9	)	$	202.5

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 March 31, 2013
Unrealized gains and losses on securities
Net realized investment gains	$	(0.7	)
Provision for income taxes		(0.1	)
Net of taxes	$	(0.8	)

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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.

Our income tax provision includes the following components:

	For the Three Months Ended March 31,
(in millions)	2013		2012
Current tax provision	$	1.8	$	3.6
Deferred tax provision related to:
Future tax deductions		2.4		4.4
Valuation allowance change		0.6		0.5
Income tax provision	$	4.8	$	8.5

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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 months ended March 31, 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 March 31,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	16.1			0.0	%	$	0.3			0.0	%
United States		17.5			18.3	%		25.4			27.9	%
United Kingdom		6.0			25.5	%		4.7			31.0	%
Belgium		0.0	(1)		-67.6	%		0.1			27.8	%
Brazil		(1.8	)		0.0	%		(1.6	)		1.2	%
Dubai		0.0			0.0	%		0.0	(1)		0.0	%
Ireland		0.0			0.0	%		(0.1	)		0.0	%
Malta		(0.3	)		0.0	%		(0.7	)		0.0	%
Switzerland		0.0	(1)		24.5	%		0.0	(1)		24.4	%
Pre-tax income (loss)	$	37.5					$	28.1

(1) 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 months ended March 31, 2013 and 2012 is as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Income tax provision at expected rate	$	6.7		$	9.3
Tax effect of:
Tax-exempt interest		(1.4	)		(1.4	)
Dividends received deduction		(0.6	)		(0.4	)
Valuation allowance change		0.6			0.5
Other permanent adjustments, net		(0.9	)		0.5
Adjustment for annualized rate		0.4			(0.2	)
United States state tax benefit		(0.2	)		(0.1	)
Foreign exchange adjustments		0.2			0.3
Income tax provision	$	4.8		$	8.5
Income tax provision - Foreign	$	1.6		$	1.4
Income tax provision - United States Federal		3.5			7.2
Income tax benefit - United States State		(0.3	)		(0.1	)
Income tax provision	$	4.8		$	8.5

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 March 31, 2013, we had a total net deferred tax liability of $4.2 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 $30.5 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

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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 $53.1 million is required as of March 31, 2013. The loss carryforwards available per year are $2.8 million as required by Internal Revenue Code Section 382. For the three months ended March 31, 2013, the valuation allowance was reduced by $0.2 million pertaining to the use of the PXRE and ARIS loss carryforwards, was increased by $0.1 million pertaining to the Malta operations and was increased by $0.7 million pertaining to the Brazil operations.

We had no material unrecognized tax benefits as of March 31, 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 three months ended March 31, 2013 and 2012:

	2013			2012
Risk-free rate of return		0.80	%		1.09	%
Expected dividend yields		1.64	%		1.67	%
Expected award life (years)		5.07			5.03
Expected volatility		31.9	%		32.6	%

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. We are prohibited from repricing the options. The term of the share options cannot exceed seven years from the grant date.

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A summary of option activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		388,187		$	36.90
Granted		0		$	0.00
Exercised		(35,239	)	$	35.45
Expired or forfeited		(42,670	)	$	37.77
Outstanding at March 31, 2013		310,278		$	36.95

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 $0.3 million for the three months ended March 31, 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 March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		236,139		$	29.76
Granted		67,100		$	38.42
Vested and issued		(50,499	)	$	30.40
Expired or forfeited		(5,244	)	$	29.65
Outstanding at March 31, 2013		247,496		$	32.30

The restricted shares will vest over two to four years. Expense recognized under this plan for the restricted shares was $1.0 million and $0.2 million for the three months ended March 31, 2013 and 2012, respectively. As of March 31, 2013, there was $5.1 million of total unrecognized compensation cost related to restricted shares.

A summary of stock-settled SARs activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,154,087		$	29.74
Granted		271,777		$	40.08
Exercised		(30,706	)	$	29.10
Expired or forfeited		(46,793	)	$	30.58
Outstanding at March 31, 2013		1,348,365		$	31.81

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 $0.7 million for each of the three months ended March 31, 2013 and 2012. As of March 31, 2013, there was $3.3 million of total unrecognized compensation cost related to stock-settled SARs.

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A summary of cash-settled SARs activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,745,614		$	29.95
Granted		481,393		$	40.08
Exercised		(156,031	)	$	29.15
Expired or forfeited		(112,882	)	$	29.60
Outstanding at March 31, 2013		1,958,094		$	32.53

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 $6.5 million and $1.0 million for the three months ended March 31, 2013 and 2012, respectively. As of March 31, 2013, there was $6.4 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 $0.6 million and $0.3 million for the three months ended March 31, 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 March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		201,505		$	38.00
Granted		0		$	0.00
Exercised		(76,772	)	$	34.16
Expired or forfeited		0		$	0.00
Outstanding at March 31, 2013		124,733		$	40.37

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

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 $139.5 million and $59.2 million as of March 31, 2013 and 2012, respectively:

	For the Three Months Ended March 31,
(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 calendar year, net of reinsurance:
Current accident year		175.0			169.1
Prior accident years		(4.5	)		(3.3	)
Losses and LAE incurred during calendar year, net of reinsurance		170.5			165.8
Deduct:
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year		21.9			22.6
Prior accident years		159.7			153.1
Losses and LAE payments made during current calendar year, net of reinsurance:		181.6			175.7
Change in participation interest (2)		10.4			(3.1	)
Foreign exchange adjustments		(6.5	)		0.9
Net reserves - end of period		2,103.7			2,337.6
Add:
Reinsurance recoverables on unpaid losses and LAE, end of period		1,101.3			929.6
Gross reserves - end of period	$	3,205.0		$	3,267.2

(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 three months ended March 31, 2013 was $4.5 million in favorable prior years’ loss reserve development comprised of the following: $5.2 million net favorable development in the Excess and Surplus Lines segment primarily caused by favorable development of $5.9 million in the general and products liability lines and $3.3 million in commercial multi-peril liability, partially offset with $4.0 million of unfavorable development in commercial automobile; $1.1 million of net unfavorable development in the Commercial Specialty segment, primarily driven by $2.2 million unfavorable development in general liability due to increases in claim severity offset by $1.0 million favorable development in the surety line of business at Rockwood; $0.9 million net unfavorable development in the International Specialty segment driven by $1.3 million of unfavorable development for the property catastrophe reinsurance unit, primarily due to crop losses,

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partially offset by $0.5 million of favorable casualty losses for professional lines; $2.2 million net favorable development in the Syndicate 1200 segment driven by favorable development in property facultative and North American binder business; $0.9 million unfavorable development in the Runoff Lines segment primarily caused by $0.7 million unfavorable development related to commutations.

Included in losses and LAE for the three months ended March 31, 2012 was $3.3 million in favorable prior years’ loss reserve development comprised of the following: $9.3 million of favorable development in the Excess and Surplus Lines segment primarily driven by $6.8 million of favorable development in the general and products liability lines of business primarily in accident year 2009 and $1.9 million of favorable development in the automobile liability lines of business; $4.6 million of net unfavorable development in the Commercial Specialty segment driven by $9.4 million of unfavorable development in general liability due to increases in claim severity, $0.9 million of unfavorable development in the automobile liability lines of business, partially offset by $4.5 million of favorable development in workers compensation and $1.2 million of favorable development in short-tail lines; $0.2 million of net favorable development in the International Specialty segment primarily within the long-tail professional liability lines; $0.4 million of net favorable development in the Syndicate 1200 segment 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 and favorable development in the Directors and Officers class due to one specific claim, partially offset by unfavorable development in the International property treaty class of business due to deterioration in one cedent relating to the 2011 Japan earthquake, and unfavorable development in the non-catastrophe professional indemnity, general liability and binder classes of business due to poorer than expected claims experience; and $2.0 million of unfavorable development in the Run-off Lines segment primarily related to risk management run-off reserves due to strengthening the reserve for unallocated loss adjustment expenses.

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 months ended March 31, 2013 and 2012 was $5.1 million and $6.9 million. 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 $3.6 million and $6.9 million, which represent the fair value of these contracts at March 31, 2013 and December 31, 2012, respectively.

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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 months ended March 31, 2013 and 2012 were as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Commissions	$	51.9		$	49.4
General expenses		68.7			60.5
Premium taxes, boards and bureaus		6.8			6.1
		127.4			116.0
Net (deferral) amortization of policy acquisition costs		(0.7	)		(2.3	)
Total underwriting, acquisition and insurance expenses	$	126.7		$	113.7

Included in general expenses for the three months ended March 31, 2013 was $5.5 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.

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Revenue and income (loss) before income taxes for each segment for the three months ended March 31, 2013 and 2012 were as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Revenue:
Earned premiums
Excess and Surplus Lines	$	105.1		$	96.2
Commercial Specialty		75.2			82.0
International Specialty		32.7			28.0
Syndicate 1200		90.9			71.1
Run-off Lines		0.3			0.0
Total earned premiums		304.2			277.3
Net investment income
Excess and Surplus Lines		10.9			13.0
Commercial Specialty		5.9			6.9
International Specialty		2.3			4.1
Syndicate 1200		2.8			3.9
Run-off Lines		2.8			3.5
Corporate and Other		3.2			0.0
Total net investment income		27.9			31.4
Fee income, net		0.0			1.3
Net realized investment gains		9.5			13.1
Total revenue	$	341.6		$	323.1
	For the Three Months Ended March 31,
(in millions)	2013			2012
Income (loss) before income taxes
Excess and Surplus Lines	$	13.9		$	18.9
Commercial Specialty		5.7			(0.3	)
International Specialty		4.8			5.8
Syndicate 1200		8.4			1.7
Run-off Lines		(0.4	)		(0.4	)
Total segment income (loss) before taxes		32.4			25.7
Corporate and Other		(4.4	)		(10.7	)
Net realized investment and other gains		9.5			13.1
Total income (loss) before income taxes	$	37.5		$	28.1

The table below presents earned premiums by geographic location for the three months ended March 31, 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.

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	For the Three Months Ended March 31,
(in millions)	2013		2012
Bermuda	$	25.8	$	22.3
Brazil		10.0		6.5
Malta		0.4		0.0
United Kingdom		87.0		70.3
United States		181.0		178.2
Total earned premiums	$	304.2	$	277.3

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

(in millions)	March 31, 2013		December 31, 2012
Excess and Surplus Lines	$	2,227.1	$	2,206.7
Commercial Specialty		1,307.2		1,337.7
International Specialty		753.2		731.8
Syndicate 1200		1,670.4		1,811.4
Run-off Lines		565.6		516.5
Corporate and Other		79.0		84.8
Total	$	6,602.5	$	6,688.9

Included in total assets at March 31, 2013 and December 31, 2012 are $355.8 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 $2.5 million and $8.1 million during the three months ended March 31, 2013 and 2012, respectively.

Interest paid. Interest paid for the three months ended March 31, was as follows:

	For the Three Months Ended March 31,
(in millions)	2013		2012
Senior unsecured fixed rate notes	$	2.3	$	0.0
Other indebtedness		0.9		1.0
Junior subordinated debentures		1.9		6.9
Total interest paid	$	5.1	$	7.9

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 March 31, 2013 and December 31, 2012, the carrying values of premiums receivable over 90 days were $25.3 million and $24.3 million, respectively. Included in “Reinsurance recoverables” in the

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Consolidated Balance Sheets at March 31, 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 March 31, 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 March 31, 2013 and December 31, 2012, the carrying values over 90 days were $16.2 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 collectibility was deemed questionable, have been included in the allowances. At March 31, 2013 and December 31, 2012, the allowance for doubtful accounts for premiums receivable was $3.1 million and $2.5 million, respectively. The allowance for doubtful accounts for reinsurance recoverables on paid losses was $2.2 million at both March 31, 2013 and December 31, 2012. Premiums receivable over 90 days were secured by collateral in the amount of $0.7 million and $0.4 million at March 31, 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 March 31, 2013 and December 31, 2012.

At March 31, 2013 and December 31, 2012 the fair value of our Junior Subordinated Debentures, Senior unsecured fixed rate notes, and other indebtedness was estimated using 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 March 31, 2013 and December 31, 2012 is shown below:

	March 31, 2013				December 31, 2012
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Junior subordinated debentures	$	193.3	$	156.6	$	193.3	$	151.8
Senior unsecured fixed rate notes		143.8		143.2		143.8		143.2
Other indebtedness:
Floating rate loan stock		63.6		51.5		63.0		49.5
Note payable		0.8		0.6		0.8		0.6
	$	401.5	$	351.9	$	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 March 31, 2013 and December 31, 2012 and for the three months ended March 31, 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

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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

March 31, 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	$	2.6	$	2,799.3	$	1,331.3		$	0.0		$	4,133.2
Cash		0.0		78.9		12.3			0.0			91.2
Premiums receivable		0.0		143.5		222.1			0.0			365.6
Reinsurance recoverables		0.0		1,159.6		81.2			0.0			1,240.8
Goodwill and other intangible assets		0.0		138.8		105.0			0.0			243.8
Current income taxes receivable, net		0.0		9.6		4.0			0.0			13.6
Deferred acquisition costs, net		0.0		52.1		48.5			0.0			100.6
Ceded unearned premiums		0.0		87.8		143.1			0.0			230.9
Other assets		7.3		111.6		63.9			0.0			182.8
Due from affiliates		0.0		9.7		(9.7	)		0.0			0.0
Intercompany note receivable		0.0		130.4		(130.4	)		0.0			0.0
Investments in subsidiaries		1,661.8		0.0		0.0			(1,661.8	)		0.0
Total assets	$	1,671.7	$	4,721.3	$	1,871.3		$	(1,661.8	)	$	6,602.5
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0	$	2,205.1	$	999.9		$	0.0		$	3,205.0
Unearned premiums		0.0		410.5		326.8			0.0			737.3
Funds held and ceded reinsurance payable, net		0.0		622.1		(109.5	)		0.0			512.6
Long-term debt		49.0		288.9		63.6			0.0			401.5
Current income taxes payable, net		0.0		0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0		49.3		8.0			0.0			57.3
Accrued underwriting expenses and other liabilities		12.8		80.5		48.9			0.0			142.2
Due to affiliates		3.2		0.0		0.0			(3.2	)		0.0
Intercompany note payable		60.1		0.0		0.0			(60.1	)		0.0
Total liabilities		125.1		3,656.4		1,337.7			(63.3	)		5,055.9
Total shareholders’ equity		1,546.6		1,064.9		533.6			(1,598.5	)		1,546.6
Total liabilities and shareholders’ equity	$	1,671.7	$	4,721.3	$	1,871.3		$	(1,661.8	)	$	6,602.5

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

⁽²) Includes all Argo Group parent company eliminations

30

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 MARCH 31, 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		$	107.7		$	196.5		$	0.0		$	304.2
Net investment income		0.0			20.9			7.3			(0.3	)		27.9
Fee income, net		0.0			(0.3	)		0.3			0.0			0.0
Net realized investment gains		0.0			7.6			1.9			0.0			9.5
Total revenue		0.0			135.9			206.0			(0.3	)		341.6
Expenses:
Losses and loss adjustment expenses		0.0			64.3			106.2			0.0			170.5
Other reinsurance-related expenses		0.0			1.5			3.6			0.0			5.1
Underwriting, acquisition and insurance expenses		6.2			48.7			71.8			0.0			126.7
Interest expense		0.8			3.7			0.7			(0.3	)		4.9
Foreign currency exchange (gain) loss		(0.1	)		0.2			(3.2	)		0.0			(3.1	)
Total expenses		6.9			118.4			179.1			(0.3	)		304.1
(Loss) income before income taxes		(6.9	)		17.5			26.9			0.0			37.5
Provision for income taxes		0.0			3.2			1.6			0.0			4.8
Net (loss) income before equity in earnings of subsidiaries		(6.9	)		14.3			25.3			0.0			32.7
Equity in undistributed earnings of subsidiaries		39.6			0.0			0.0			(39.6	)		0.0
Net income	$	32.7		$	14.3		$	25.3		$	(39.6	)	$	32.7

⁽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 STATEMENT OF (LOSS) INCOME

FOR THE THREE MONTHS ENDED MARCH 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
Premiums and other revenue:
Earned premiums	$	0.0		$	108.9		$	168.4	$	0.0		$	277.3
Net investment income		0.0			21.9			9.5		0.0			31.4
Fee income, net		0.0			0.2			1.1		0.0			1.3
Net realized investment gains		0.0			9.6			3.5		0.0			13.1
Total revenue		0.0			140.6			182.5		0.0			323.1
Expenses:
Losses and loss adjustment expenses		0.0			68.5			97.3		0.0			165.8
Other reinsurance-related expenses		0.0			0.0			6.9		0.0			6.9
Underwriting, acquisition and insurance expenses		7.0			43.2			63.5		0.0			113.7
Interest expense		0.9			3.8			1.0		0.0			5.7
Foreign currency exchange (gain) loss		0.0			(0.1	)		3.0		0.0			2.9
Total expenses		7.9			115.4			171.7		0.0			295.0
Income (loss) before income taxes		(7.9	)		25.2			10.8		0.0			28.1
Provision for income taxes		0.0			7.0			1.5		0.0			8.5
Net income (loss) before equity in losses of subsidiaries		(7.9	)		18.2			9.3		0.0			19.6
Equity in undistributed losses of subsidiaries		27.5			0.0			0.0		(27.5	)		0.0
Net income	$	19.6		$	18.2		$	9.3	$	(27.5	)	$	19.6

⁽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 THREE MONTHS ENDED MARCH 31, 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	$	(0.5	)	$	2.7		$	(86.2	)	$	0.0		$	(84.0	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			199.0			237.2			0.0			436.2
Proceeds from maturities and mandatory calls of investments		0.0			86.7			28.4			0.0			115.1
Purchases of investments		0.0			(282.9	)		(159.9	)		0.0			(442.8	)
Change in short-term investments and foreign regulatory deposits		(2.2	)		28.6			(32.8	)		0.0			(6.4	)
Settlements of foreign currency exchange forward contracts		0.2			0.0			(2.1	)		0.0			(1.9	)
Issuance of intercompany note, net		0.0			(10.0	)		5.1			4.9			0.0
Other, net		0.0			(6.2	)		0.7			0.0			(5.5	)
Cash provided (used) by investing activities		(2.0	)		15.2			76.6			4.9			94.7
Cash flows from financing activities:
Borrowings under intercompany note, net		4.9			0.0			0.0			(4.9	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		1.3			0.0			(1.3	)		0.0			0.0
Activity under stock incentive plans		0.0			0.0			1.3			0.0			1.3
Repurchase of Company’s common shares		0.0			(12.9	)		0.0			0.0			(12.9	)
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		(3.7	)		0.0			0.0			0.0			(3.7	)
Cash provided (used) by financing activities		2.5			(12.9	)		0.0			(4.9	)		(15.3	)
Effect of exchange rate changes on cash		0.0			0.0			0.0			0.0			0.0
Change in cash		0.0			5.0			(9.6	)		0.0			(4.6	)
Cash, beginning of period		0.0			73.9			21.9			0.0			95.8
Cash, end of period	$	0.0		$	78.9		$	12.3		$	0.0		$	91.2

⁽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 CASH FLOWS

FOR THE THREE MONTHS ENDED MARCH 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
Net cash flows from operating activities	$	(9.3	)	$	7.5		$	(4.2	)	$	0.0		$	(6.0	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			224.6			180.2			0.0			404.8
Proceeds from maturities and mandatory calls of investments		0.0			72.7			33.8			0.0			106.5
Purchases of investments		0.0			(321.3	)		(187.1	)		0.0			(508.4	)
Change in short-term investments and foreign regulatory deposits		(0.6	)		35.7			(17.4	)		0.0			17.7
Settlements of foreign currency exchange forward contracts		0.3			0.0			(0.9	)		0.0			(0.6	)
Issuance of intercompany note, net		0.0			(15.0	)		2.3			12.7			0.0
Other, net		0.0			(6.1	)		(7.4	)		0.0			(13.5	)
Cash provided (used) by investing activities		(0.3	)		(9.4	)		3.5			12.7			6.5
Cash flows from financing activities:
Borrowings under intercompany note, net		12.7			0.0			0.0			(12.7	)		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		0.0			0.0			0.0			0.0			0.0
Repurchase of Company’s common shares		0.0			(9.3	)		0.0			0.0			(9.3	)
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		(3.1	)		0.0			0.0			0.0			(3.1	)
Cash (used) provided by financing activities		9.6			(9.3	)		0.0			(12.7	)		(12.4	)
Effect of exchange rate changes on cash		0.0			0.0			0.3			0.0			0.3
Change in cash		(0.0	)		(11.2	)		(0.4	)		0.0			(11.6	)
Cash, beginning of period		0.0			85.1			17.6			0.0			102.7
Cash, end of period	$	(0.0	)	$	73.9		$	17.2		$	0.0		$	91.1

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

⁽²⁾ Includes all Argo Group parent company eliminations

33

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 months ended March 31, 2013 compared with the three months ended March 31, 2012, and also a discussion of our financial condition as of March 31, 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 March 31,
(in millions)	2013			2012
Gross written premiums	$	438.2		$	396.3
Earned premiums	$	304.2		$	277.3
Net investment income		27.9			31.4
Fee income, net		0.0			1.3
Net realized investment and other gains		9.5			13.1
Total revenue	$	341.6		$	323.1
Income before income taxes	$	37.5		$	28.1
Provision for income taxes		4.8			8.5
Net income	$	32.7		$	19.6
Loss ratio		57.0	%		61.3	%
Expense ratio		42.4	%		42.1	%
Combined ratio		99.4	%		103.4	%

34

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 exits from 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. Additionally, consolidated net investment income was adversely impacted by declining yields.

The decline in consolidated net realized investment gains for the three months ended March 31, 2013 was attributable to the recognition of $4.8 million of other-than-temporary impairments on select equity and strategic investments. Consolidated net realized investment gains for the three months ended March 31, 2013, excluding the other-than-temporary impairments, were $14.3 million primarily within our fixed maturity and other invested assets portfolio.

We have purchased foreign currency 90 day forward contracts to manage currency exposure on losses related to the New Zealand and Japan earthquakes and Australian floods. The terms of these contracts give us flexibility to adjust the notional amount of the contracts based on payments made and changes in estimates of future losses. We do not apply hedge accounting to these contracts, and as a result, all gains (losses) are recognized in net realized investment gains. For the three months ended March 31, 2013 we recognized $0.5 million in foreign currency exchange gains related to the loss reserves recorded for these events, which were offset by $0.7 million in realized losses from the currency forward contracts. For the three months ended March 31, 2012 we recognized $2.3 million in foreign currency exchange losses related to the loss reserves recorded for these events and an additional $0.1 million in realized losses from the currency forward contracts.

Consolidated losses and loss adjustment expenses were $170.5 million and $165.8 million for the three months ended March 31, 2013 and 2012, respectively. Included in losses and loss adjustment expenses for the three months ended March 31, 2013 and 2012 was $1.9 million and $4.1 million, respectively, in catastrophe losses resulting from storm activity in the United States. Included in losses and loss adjustment expenses for the three months ended March 31, 2013 was $4.5 million in net favorable loss reserve development on prior accident years compared to $3.3 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 prior year loss reserves by line of business for the three months ended March 31, 2013:

(in millions)	2012 Net Reserves		Net Reserve Development (Favorable)/Unfavorable			Percent of 2012 Net Reserves
General liability	$	919.9	$	(5.0	)		-0.5	%
Workers compensation		365.3		0.2			0.1	%
Commercial multi-peril		195.2		(1.3	)		-0.7	%
Commercial auto liability		165.1		3.3			2.0	%
Reinsurance - nonproportional assumed property		122.9		1.5			1.2	%
Special property		21.6		(0.2	)		-0.9	%
Syndicate 1200 property		140.1		(1.7	)		-1.2	%
Syndicate 1200 liability		122.5		(0.1	)		-0.1	%
All other lines		58.3		(1.2	)		-2.1	%
Total	$	2,110.9	$	(4.5	)		-0.2	%

In determining appropriate reserve levels at March 31, 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

35

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 they 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 March 31, 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 $3,205.0 million (including $132.0 million of reserves attributable to the Syndicate 1200 segment’s trade capital providers), and $3,267.2 million (including $181.9 million of reserves attributable to the Syndicate 1200 segment’s trade capital providers) as of March 31, 2013 and 2012, respectively. Management has recorded its best estimate of loss reserves as of March 31, 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.

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 $5.1 million and $6.9 million for the three months ended March 31, 2013 and 2012, respectively. 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 $126.7 million and $113.7 million for the three months ended March 31, 2013 and 2012, respectively. The increase in the dollar value of the expense was primarily attributable to increased acquisition costs due to the growth in premiums, coupled with a $5.5 million increase in equity compensation expenses due to the impact of the increase in our stock price on our cash-settled stock appreciation rights.

Consolidated interest expense was $4.9 million for the three months ended March 31, 2013 compared to $5.7 million for the same period in 2012. The decline in consolidated interest expense was the result of redemption of two fixed-rate junior subordinated debentures with the proceeds of the senior fixed rate notes, which bear a lower interest rate.

36

Consolidated foreign currency exchange gain for the three months ended March 31, 2013 was $3.1 million compared to a foreign currency exchange loss of $2.9 million for the same period ended 2012. The increase to a foreign currency exchange gain was due to the U.S Dollar strengthening against the currencies in which we transact our business.

The consolidated provision for income taxes was $4.8 million for the three months ended March 31, 2013 compared to $8.5 million consolidated income tax provision for the same period ended 2012. 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. For the three months ended March 31, 2013 our operations in the United States generated lower taxable income as compared to 2012, resulting in a lower effective tax rate. Additionally for the three months ended March 31, 2013, our Bermuda operations, which are not subject to income taxes, reported net income compared to a net loss for the same period ended 2012.

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.

Since we generally manage and monitor the investment portfolio and indebtedness on an aggregate basis, the overall performance of the investment portfolio, including 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 months ended March 31, 2013 and 2012:

	Three Months Ended March 31,
(in millions)	2013			2012
Gross written premiums	$	127.6		$	107.3
Earned premiums	$	105.1		$	96.2
Losses and loss adjustment expenses		58.6			52.2
Other reinsurance-related expenses		1.2			0.0
Underwriting, acquisition and insurance expenses		40.7			35.8
Underwriting income		4.6			8.2
Net investment income		10.9			13.0
Interest expense		(1.6	)		(2.3	)
Income before income taxes	$	13.9		$	18.9
Loss ratio		56.5	%		54.2	%
Expense ratio		39.1	%		37.3	%
Combined ratio		95.6	%		91.5	%

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The increase in gross written and earned premiums for the three months ended March 31, 2013 as compared to the same period in 2012 was primarily attributable to increased premium writings in our casualty, property and environmental business units. 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 to 56.5% for the three months ended March 31, 2013 from 54.2% for the same period in 2012 was primarily attributable to lower favorable development on prior year loss reserves and $0.8 million of catastrophe losses being recognized in 2013. Included in losses and loss adjustment expenses for the three months ended March 31, 2013 was $5.2 million favorable development in the Excess and Surplus Lines segment primarily caused by favorable development of $5.9 million in the general and products liability lines and $3.3 million in commercial multi-peril liability, partially offset with $4.0 million of unfavorable development in commercial automobile. Included in losses and loss adjustment expenses for the three months ended March 31, 2012 was $9.3 million of favorable reserve development resulting principally from $6.8 million of favorable development in the general and products liability lines of business and $1.9 million of favorable development in the automobile liability lines of business. Loss reserves were $1,208.7 million and $1,271.2 million at March 31, 2013 and 2012, respectively.

The increase in the expense ratio for the three months ended March 31, 2013 as compared to the same period in 2012 was primarily attributable 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 months ended March 31, 2013 and 2012:

	Three Months Ended March 31,
(in millions)	2013			2012
Gross written premiums	$	106.1		$	107.7
Earned premiums	$	75.2		$	82.0
Losses and loss adjustment expenses		47.5			59.3
Other reinsurance-related expenses		0.3			0.0
Underwriting, acquisition and insurance expenses		26.4			28.7
Underwriting income (loss)		1.0			(6.0	)
Net investment income		5.9			6.9
Interest expense		(0.9	)		(1.4	)
Fee income, net		(0.3	)		0.2
Income (loss) before income taxes	$	5.7		$	(0.3	)
Loss ratio		63.4	%		72.4	%
Expense ratio		35.2	%		35.0	%
Combined ratio		98.6	%		107.4	%

The decline in gross written and earned premiums for the three months ended March 31, 2013 as compared to the same period ended 2012 was primarily due to reduced writings in our retail business and public entity units due to a planned reduction in writings as we exited unprofitable accounts and implemented underwriting initiatives, partially offset by increasing rates. Additionally, gross written and earned premiums declined for our mining products due to reduced payrolls from our coal mining accounts. Partially offsetting these declines was increased gross written premiums in the surety products, as this business unit continues to expand.

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The decline in the loss ratio for the three months ended March 31, 2013 as compared to the same period in 2012 was primarily from decreased catastrophe losses due to storms in the United States and decreased unfavorable loss reserve development on prior accident years. Catastrophe losses for the three months ended March 31, 2013 were $1.1 million compared to $2.3 million for the same period in 2012. Losses and loss adjustment expenses for the three months ended March 31, 2013 included $1.1 million of net unfavorable development primarily driven by $2.2 million unfavorable development in general liability due to increases in claim severity, offset by $1.0 million favorable development in the surety line of business at Rockwood. Losses and loss adjustment expenses for the three months ended March 31, 2012 included $4.6 million of net unfavorable loss reserve development on prior accident years driven by $9.4 million of unfavorable development in general liability due to increases in claim severity and $0.9 million of unfavorable development in the automobile liability lines of business. Partially offsetting this unfavorable development was $4.5 million of favorable development in workers compensation and $1.2 million of favorable development in short-tail lines. Loss reserves were $648.3 million and $619.3 million at March 31, 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. Increased expense associated with the equity compensation awards was partially offset by increased ceding commissions.

International Specialty: The following table summarizes the results of operations for the International Specialty segment for the three months ended March 31, 2013 and 2012:

	Three Months Ended March 31,
(in millions)	2013			2012
Gross written premiums	$	78.2		$	57.6
Earned premiums	$	32.7		$	28.0
Losses and loss adjustment expenses		15.6			13.2
Other reinsurance-related expenses		1.5			2.3
Underwriting, acquisition and insurance expenses		12.3			9.8
Underwriting income		3.3			2.7
Net investment income		2.3			4.1
Interest expense		(0.8	)		(1.0	)
Income before income taxes	$	4.8		$	5.8
Loss ratio		50.1	%		51.4	%
Expense ratio		39.5	%		38.2	%
Combined ratio		89.6	%		89.6	%

Gross written and earned premiums increased for the quarter ended March 31, 2013 primarily as a result of the business unit in Brazil, and increases in our excess casualty and professional liability business. The increase was also due to continued growth from our excess casualty and professional liability business. Earned premiums for the property catastrophe reinsurance unit were $17.1 million for the quarter ended March 31, 2013, in-line with earned premiums for the same period in 2012. The excess casualty and professional lines business contributed earned premiums of $5.6 million for the quarter ended March 31, 2013 compared with $4.4 million for the same period in 2012. Earned premium for the business unit in Brazil was $10.0 million for the quarter ended March 31, 2013 compared with $6.5 million in 2012.

Losses and loss adjustment expenses for the quarter ended March 31, 2013 included $0.9 million of unfavorable prior year development. This was comprised of $1.3 million of unfavorable prior year development on the property catastrophe reinsurance unit, primarily due to crop loss, offset by $0.5 million of favorable prior year development on the professional liability business. There were no catastrophe losses reported in the quarter ended March 31, 2013. Included in losses and loss adjustment expenses for the three months ended March 31, 2012 were $1.7 million of losses resulting from tornadoes in the United States. Losses and loss adjustment expenses also included $0.2 million of favorable loss reserve development on prior accident years primarily within the long-tail professional liability lines. Loss reserves were $260.7 million and $253.6 million at March 31, 2013 and 2012, respectively.

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The increase in the expense ratio for 2013 as compared to 2012 was primarily attributable to $5.6 million in expenses for the business unit in Brazil and expansion of our excess casualty and professional liability franchises.

Syndicate 1200: The following table summarizes the results of operations for the Syndicate 1200 segment for the three months ended March 31, 2013 and 2012:

	Three Months Ended March 31,
(in millions)	2013			2012
Gross written premiums	$	126.1		$	123.1
Earned premiums	$	90.9		$	71.1
Losses and loss adjustment expenses		47.8			39.1
Other reinsurance-related expenses		1.6			1.9
Underwriting, acquisition and insurance expenses		35.5			32.5
Underwriting income (loss)		6.0			(2.4	)
Net investment income		2.8			3.9
Interest expense		(0.7	)		(0.9	)
Fee income, net		0.3			1.1
Income before income taxes	$	8.4		$	1.7
Loss ratio		53.5	%		56.5	%
Expense ratio		39.8	%		46.9	%
Combined ratio		93.3	%		103.4	%

In 2013 we have maintained our participation in Syndicate 1200 at 79%. For the three months ended March 31, 2013 and 2012, the property division wrote $56.5 million and $60.2 million of gross written premiums, respectively. Gross written premiums in the property division are lower than previous year by $3.7 million in continuation of our strategy to reduce our exposure to international property. This reduction has been offset by increased writings in the property facultative lines. The casualty division wrote $49.7 million and $48.7 million for the same periods. Gross written premiums increased for the three months ended March 31, 2013 as compared to the same period in 2012 due to increasing our exposure in general liability and Directors and Officers business offset by a reduction on international casualty treaty business. For the three months ended March 31, 2013 and 2012, the specialty division wrote $12.0 million and $9.3 million, respectively, and the aerospace division wrote $7.8 million and $4.9 million, respectively. The increase in the specialty division is due to increases in cargo business. Aerospace premiums increased for space and general aviation as we continue to grow these lines. 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. Included in losses and loss adjustment expenses for the three months ended March 31, 2013 were current accident year losses of $2.0 million resulting from a satellite loss. Partially offsetting these current accident year losses was $2.2 million favorable development in the Syndicate 1200 segment driven by favorable development in property facultative and North American binder business. Included in losses and loss adjustment expenses for the three months ended March 31, 2012 was $0.4 million in net favorable loss reserve development primarily attributable to favorable development in the property facultative class of business as a claim relating to Hurricane Ike. Partially offsetting this was unfavorable development in the international property treaty class of business due to deterioration in one cedant relating to the 2011 Japan earthquake, and unfavorable development in the non-catastrophe professional indemnity, general liability and binder classes of business due to poorer than expected claims experience.

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Loss reserves as of March 31, 2013 were $738.8 million which includes $132.0 million attributable to trade reinsurers, compared to $730.5 million which includes $135.0 million of reserves attributable to the trade capital providers as of March 31, 2012.

The decrease in the expense ratio for the three months ended March 2013 as compared to the same periods in 2012 was primarily attributable to a change in business mix.

Run-off Lines. We have discontinued underwriting certain lines of business, including certain workers compensation and non proportional property catastrophe programs. 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:

	Three Months Ended March 31,
(in millions)	2013			2012
Earned premiums	$	0.3		$	0.0
Losses and loss adjustment expenses		1.0			2.0
Underwriting, acquisition and insurance expenses		2.1			1.2
Underwriting loss		(2.8	)		(3.2	)
Net investment income		2.8			3.5
Interest expense		(0.4	)		(0.7	)
Loss before income taxes	$	(0.4	)	$	(0.4	)

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 March 31, 2013 included $0.9 million unfavorable development primarily attributable to $0.7 million unfavorable development related to commutations. Losses and loss adjustment expenses for the three months ended March 31, 2012 included $2.0 million of net unfavorable loss reserve development on prior accident years due to strengthening the reserve for unallocated loss adjustment expenses. Loss reserves for the Run-off Lines were as follows:

	Three Months Ended March 31,
(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		(3.3	)		(2.9	)		(2.3	)		(2.5	)
Loss reserves - asbestos and environmental, end of the period		62.0			56.7			73.0			65.7
Risk management reserves		266.6			186.9			290.8			203.4
Run-off reinsurance reserves		13.8			13.8			22.4			22.4
Other run-off lines		6.1			5.5			7.2			6.7
Total loss reserves - Run-off Lines	$	348.5		$	262.9		$	393.4		$	298.2

Underwriting, acquisition and insurance expenses for the Run-off segment consists primarily of administrative expenses. The increase in the expense for the three months ended March 31, 2013 as compared to the same period ended 2012 was primarily attributable to increased overhead allocations. Additionally, expense for the three months ended March 31, 2012 was reduced by the collection of a reinsurance recovery balance previously written off.

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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.

For the three months ended March 31, 2013, net cash used by operating activities increased to $84.0 million, compared to $6.0 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 March 31, 2013, we repurchased 325,825 shares of our common stock at an average price of $37.71 for a total cost of $12.3 million. From April 1, 2013 through May 1, 2013, we repurchased an additional 148,707 shares of our common stock at an average price of $40.59 for a total cost of $6.0 million. Since 2008, when we first began buying back our common shares, through May 1, 2013, we have repurchased 6,934,145 shares of our common stock at an average price of $32.28 for a total cost of $223.7 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 February 15, 2013, our Board of Directors declared a quarterly cash dividend in the amount of $0.15 on each share of common stock outstanding. On March 15, 2013, we paid $3.7 million to our shareholders of record on March 1, 2013.

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 will receive cash in lieu of fractional shares. In addition, the Board of Directors approved the regular quarterly cash dividend of 15 cents per share on our common stock, on a post-stock dividend basis. The cash dividend will be paid on June 20, 2013, to shareholders of record at the close of business on June 3, 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.

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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).”

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

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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.

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 March 31, 2013, our fixed maturities portfolio had a weighted average rating of AA-, with 79.7% ($2.4 billion fair value) rated A or better, and 41.5% ($1.2 billion fair value) rated AAA. Our portfolio included 6.5% ($192.4 million fair value) of less than investment grade (BB+ or lower) fixed maturities at March 31, 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	$	354.7	$	3.9	$	0.8	$	1.4	$	360.8
Non-U.S. Governments		6.0		4.9		4.5		40.3		55.7
Obligations of states and political subdivisions		139.8		406.4		107.0		4.4		657.6
Credit-Financial		6.0		45.6		222.4		105.8		379.8
Credit-Industrial		4.5		10.9		127.0		277.7		420.1
Credit-Utility		0.0		16.1		38.5		137.8		192.4
Structured securities:
CMO/MBS-agency		349.0		0.0		0.0		0.0		349.0
CMO/MBS-non agency		0.0		2.5		2.5		7.5		12.5
CMBS		95.9		5.4		13.1		3.2		117.6
ABS-residential		1.0		0.0		0.0		7.7		8.7
ABS-non residential		89.4		0.8		0.2		2.9		93.3
Foreign denominated:
Governments		165.1		24.9		5.4		5.8		201.2
Credit		22.7		33.8		59.3		8.1		123.9
Total fixed maturities	$	1,234.1	$	555.2	$	580.7	$	602.6	$	2,972.6

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

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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 months ended March 31, 2013, we recorded realized gains of $3.1 million from movements in foreign currency rates on our insurance operations, realized losses of $3.7 million from movements on foreign currency rates in our investment portfolio, and realized losses of $0.6 million from the currency forward contracts. In addition, we had unrealized losses at March 31, 2013 of $8.3 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.

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 months ended March 31, 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 March 31, 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 March 31, 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.

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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

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 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 three months ended March 31, 2013, we repurchased 325,825 shares at a cost of $12.3 million.

As of March 31, 2013, we had repurchased a total of 6,785,438 of our common shares (total of $217.8 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 March 31, 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)
January 1 through January 31, 2013		171,480	$	35.41		171,480	$	64,886,276
February 1 through February 28, 2013		—	$	—		—	$	64,886,276
March 1 through March 31, 2013		226,629	$	40.06		154,345	$	58,670,538
Total		398,109	$	38.06		325,825

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 March 31, 2013, we received 11,671 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 March 31, 2013, we received 60,613 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

Departure of Barbara Bufkin

On May 9, 2013, the Company announced that Barbara Bufkin, the Executive Vice President, Business Development, would leave the Company effective as of June 15, 2013. In connection with Ms. Bufkin’s resignation, the Company and Ms. Bufkin entered into a Separation Agreement and General Release (the “Separation Agreement”) on May 8, 2013, which superseded and replaced the Executive Employment Agreement between the Company and Ms. Bufkin, dated March 10, 2011.

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Under the terms of the Separation Agreement, Ms. Bufkin agreed to repay the Company $93,000 by June 15, 2013 in accordance with the terms of the March 10, 2011 letter agreement between the Company and Ms. Bufkin (the “Letter Agreement”). The final installment of 3,205 restricted shares granted to Ms. Bufkin pursuant to the Letter Agreement and scheduled to vest on March 10, 2014 will be forfeited by Ms. Bufkin, and the second installment of 3,205 restricted shares will vest in accordance with the terms of the Letter Agreement.

Ms. Bufkin also agreed to certain noncompete and nonsolicit obligations for one year after the termination of her employment, along with ongoing confidentiality obligations and a release of claims as specified in the Separation Agreement.

A copy of the Separation Agreement is attached to this Form 10-Q as Exhibit 10.1 and is incorporated herein by reference. The foregoing summary of the terms and conditions of the Separation Agreement is qualified in its entirety by reference to Exhibit 10.1.

Submission of Matters to a Vote of Security Holders

The Company held its 2013 Annual General Meeting on May 7, 2013. At the 2013 Annual General Meeting, the Company’s shareholders (1) elected the Company’s four Class III director nominees to the Company’s board of directors, (2) voted for the Company’s executive compensation on a non-binding, advisory basis, and (3) approve Ernst & Young LLP’s appointment as the Company’s independent auditors for the fiscal year ending December 31, 2013.

The results of each vote, including the number of abstentions and broker non-votes, are set forth below for each matter brought to a shareholder vote at the 2013 Annual General Meeting.

							Broker
Director	For		Against		Abstentions		Non-Votes
F. Sedgwick Browne		21,230,424		407,957		35,916		1,290,093
Hector DeLeon		21,223,470		414,211		36,616		1,290,093
Kathleen A. Nealon		21,016,130		608,281		49,886		1,290,093
John H. Tonelli		21,014,435		608,909		50,953		1,290,093
							Broker
	For		Against		Abstentions		Non-Votes
Advisory Approval of Executive Compensation		21,019,685		436,572		218,040		1,290,093
							Broker
	For		Against		Abstentions		Non-Votes
Appointment of Independent Auditors		22,907,014		21,882		35,494		—

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.

47

EXHIBIT INDEX

Exhibit Number	Description
10.1	Separation Agreement and General Release, dated May 8, 2013, between Argo Group International Holdings, Ltd. and Barbara C. Bufkin.
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.

48

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.
May 9, 2013	By:	/s/ Mark E. Watson III
	Mark E. Watson III
	President and Chief Executive Officer
May 9, 2013	By:	/s/ Jay S. Bullock
	Jay S. Bullock
	Executive Vice President and Chief Financial Officer

49

EX-10.1

EXHIBIT 10.1

SEPARATION AGREEMENT AND GENERAL RELEASE

Argo Group International Holdings, Ltd. (the “Company”) and I, Barbara C. Bufkin, agree as follows:

I. Separation Benefits

A. In General: The Company promises that, within fourteen (14) business days after I sign this Separation Agreement and General Release, I will receive the consideration and benefits set forth in this Section that are conditioned on my execution of this Agreement. I may revoke this Agreement within seven (7) days after I sign it, in which case I will not receive the consideration and benefits that are conditioned on my execution of this Agreement. I acknowledge that the Company is not otherwise required to provide me with the consideration and benefits set forth in this Section. This Agreement will not become effective or enforceable unless and until the seven-day revocation period has expired without my revoking it.

B. Executive Employment Agreement: The Company and I agree that my Executive Employment Agreement with the Company dated March 10, 2011 (the “Executive Employment Agreement”) is hereby terminated and superseded by this Agreement.

C. Sufficiency of Consideration: I acknowledge and agree that the consideration and benefits to be provided under the terms of the Agreement are, in significant and substantial part, in addition to those benefits to which I am otherwise entitled.

D. Pro Rata Repayment of Signing Bonus / Stock Award: I agree to repay to the Company the amount of $93,000, as required under a letter agreement dated March 10, 2011 between me and the Company executed in conjunction with my Executive Employment Agreement (the “Letter Agreement”), on or before June 15, 2013. The Company agrees that I will remain an employee of the Company through June 15, 2013 so that the second installment of 3,205 of the 9,615 restricted shares that were granted to me pursuant to the Letter Agreement will vest. I further agree that the final installment of 3,205 restricted shares granted to me pursuant to the Letter Agreement scheduled to vest on March 10, 2014 will be forfeited due to the termination of my employment with the Company.

E. Compensation and Benefit Plans: I will cease to be eligible to participate under any applicable stock option, bonus, incentive compensation, medical, dental, life insurance, retirement, and other compensation or benefit plans of the Company following my termination of employment. Thereafter, I will have no rights under any of those plans, except as follows:

1. I will receive all compensation earned through the date of my termination, June 15, 2013.

2. I will receive payment for my unused accrued vacation days.

3. The Company will pay the employer portion of all previously elected health benefits through September 15, 2013, unless I become eligible for health benefits from another employer prior to that date.

4. I will have the right to COBRA continuation coverage as to any Company-provided medical, dental, vision, or flex spending plan in which I participate, which means that I will be entitled to buy continued health plan coverage under the normal COBRA health care continuation rules.

5. I will retain my vested benefits under all applicable qualified and non-qualified retirement plans of the Company, and all rights associated with such benefits, as determined under the official terms of those plans.

II. Complete Release

A. In General: In exchange for the Company’s promises contained in this Agreement, I agree to irrevocably and unconditionally release any and all Claims I may now have against the Company and other parties as set forth in this Section II.

B. Released Parties: The Released Parties are the Company, all related companies, partnerships, or joint ventures, and, with respect to each of them, their predecessors and successors; and, with respect to each such entity, all of its past and present employees, officers, directors, stockholders, owners, representatives, assigns, attorneys, agents, insurers, employee benefit programs (and the trustees, administrators, fiduciaries, and insurers of such programs), and any other persons acting by, through, under or in concert with any of the persons or entities listed in this subsection (the “Released Parties” and each a “Released Party”).

C. Claims Released: I understand and agree that I am releasing all known and unknown claims, promises, causes of action, or similar rights of any type that I may have (the “Claims”) against any Released Party, except that I am not releasing any claim that relates to: (i) my right to enforce this Agreement; (ii) my right, if any, to claim government-provided unemployment benefits, or (iii) any rights or claims which may arise or accrue after I sign this Agreement). I further understand that the Claims I am releasing may arise under many different laws (including statutes, regulations, other administrative guidance, and common law doctrines), including, but by no means limited to:

2

1. Anti-discrimination statutes, such as the Age Discrimination in Employment Act, the Older Workers Benefit Protection Act, and Executive Order 11141, which prohibit age discrimination in employment; Title VII of the Civil Rights Act of 1964, Section 1981 of the Civil Rights Act of 1866, and Executive Order 11246, which prohibit discrimination based on race, color, national origin, religion, or sex; the Equal Pay Act, which prohibits paying men and women unequal pay for equal work; the Americans With Disabilities Act and Sections 503 and 504 of the Rehabilitation Act of 1973, which prohibit discrimination based on disability; and any other federal, state, or local laws prohibiting employment or wage discrimination.

2. Federal employment statutes, such as the WARN Act, which requires that advance notice be given of certain work force reductions; the Employee Retirement Income Security Act of 1974, which, among other things, protects employee benefits; the Fair Labor Standards Act of 1938 and state laws which regulates wage and hour matters; the Family and Medical Leave Act of 1993, which requires employers to provide leaves of absence under certain circumstances; and any other federal laws relating to employment, such as veterans’ reemployment rights laws.

3. Other laws, such as any federal, state, or local laws providing workers’ compensation benefits (or prohibiting workers’ compensation retaliation), restricting an employer’s right to terminate employees, or otherwise regulating employment; any federal, state, or local law enforcing express or implied employment contracts or requiring an employer to deal with employees fairly or in good faith.

4. Tort and Contract Claims, such as claims for wrongful discharge, negligence, negligent hiring, negligent supervision, negligent retention, physical or personal injury, emotional distress, fraud, fraud in the inducement, negligent misrepresentation, defamation, invasion of privacy, interference with contract or with prospective economic advantage, breach of express or implied contract, breach of covenants of good faith and fair dealing, promissory estoppel, and similar or related claims.

5. Examples of released Claims include, but are not limited to: (i) Claims that in any way relate to my employment with the Company or any other Released Party, or the termination of that employment, such as Claims for compensation, bonuses, commissions, lost wages, or unused accrued vacation or sick pay; (ii) Claims that in any way relate to the design or administration of any employee benefit program; (iii) Claims that I have irrevocable or vested rights to severance or similar benefits or to post-employment health or group insurance benefits; or (iv) any Claims to attorneys’ fees or other indemnities.

D. Unknown Claims: I understand that I am releasing Claims that I may not know about through the date of this Agreement. It is my knowing and voluntary intent, to release all known and unknown Claims, through the date of this Agreement, I am assuming the risk of releasing such claims through the date of this Agreement and I agree that this Agreement shall remain effective in all respects in any such case. I expressly waive all rights I might have under law that is intended to protect me from waiving unknown claims and understand the significance of doing so.

3

III. Promises

A. Employment Termination: I understand and agree that my employment with the Company will terminate on June 15, 2013. I also understand and agree that I have no right of rehire or reinstatement with any Released Party, regardless of location, and that the Released Party is under no obligation to rehire or reinstate me. I also acknowledge and understand that the failure of a Released Party to rehire or reinstate me is contractual and is in no way discriminatory or retaliatory in nature.

B. Pursuit of Released Claims: I have not filed or caused to be filed any lawsuit, complaint, or charge with respect to any Claim this Agreement purports to waive, and I promise never to file or prosecute a lawsuit or complaint based on such Claims. I promise never to seek any damages, remedies, or other relief for myself personally (any right to which I hereby waive) by filing or prosecuting a charge with any administrative agency with respect to any such Claim. I promise to request any government agency or other body assuming jurisdiction of any such lawsuit, complaint, or charge to withdraw from the matter or dismiss the matter with prejudice.

C. Company Property: I promise to return to the Company all files, memoranda, documents, records, electronic records, software, copies of the foregoing, credit cards, keys, and any other property of the Company or its affiliates in my possession. Notwithstanding the above, the Company agrees that I will retain my phone number, 214-850-8811, my electronic calendar and contact list, and other personal items from my offices in London and Bermuda.

D. Taxes: I am responsible for paying any taxes on amounts I receive because I signed this Release. I agree that the Company may withhold all taxes it is legally required to withhold, except as expressly otherwise provided in Section I.

E. Ownership of Claims: I have not assigned or transferred any Claim I am releasing, nor have I purported to do so.

F. Implementation: I agree to sign any documents and do anything else that is necessary in the future to implement this Agreement.

G. Age Representation: I am over the age forty at the time of signing this Agreement.

4

H. Confidential Information: I hereby acknowledge that during the course of my employment, up through the time that my employment terminated, I gained knowledge or information of a confidential nature in which the Company has a proprietary interest. I accordingly agree not to disclose to any person or any entity any such confidential, proprietary, or trade secret information of or about the Company without the express written authorization and consent from the Company. Such confidential and proprietary information includes any non-public information relating to the Company’s products, services, technology and business affairs, including without limitation, any and all concepts, advertising information, techniques, processes, designs, trade secrets, business methods, cost data, computer programs, software, scientific or technical know-how, financial, marketing, manufacturing processes, research developments, business activities and operations, inventions, customer or client lists, industrial practices, financial statements and/or other business information, or any information that the Company specifically refers to as confidential information or labels as confidential information.

I. Restrictive Covenants: During the period of one (1) year following the termination of my employment I shall not:

A. Directly or indirectly, for myself or for any other individual, partnership, firm, corporation or other organization (other than the Company or its affiliates) solicit or induce or endeavor to solicit or induce any Restricted Employee (as defined in my Executive Employment Agreement) to cease working for or providing services to the Company, or hire, directly or indirectly, any Restricted Employee, in either case, whether or not any such person would thereby commit a breach of contract. Nothing herein shall prohibit solicitation of any Company Employee (i) who voluntarily terminated his or her employment or engagement at least three months prior to the date such solicitation first commenced or (ii) whose employment or engagement has been terminated by the Company (as opposed to voluntarily by such Company Employee); or

B. Directly or indirectly interfere with Company Services (as defined in my Executive Employment Agreement) with any of the Company’s customers, prospects or clients or induce, or encourage any customer or client to stop doing business with Company or induce or encourage any prospect to not retain the services of Company; or

C. Be directly or indirectly employed or engaged by any of the Company’s designated peers (as set forth on page 26 of the Company’s Proxy Statement filed with the United States Securities & Exchange Commission on March 22, 2013) whose ultimate holding companies are domiciled in the United States or any of their affiliates or subsidiaries either as an officer, director, employee, consultant or otherwise.

5

IV. Breach of Agreement

A. I agree to pay the reasonable attorneys’ fees and any damages the Released Parties may incur as a result of my breaching a promise I made in this Agreement, or if any representation I made in this Agreement was false when made.

B. Argo agrees to pay the reasonable attorneys’ fees and any damages that I may incur as a result of its breaching a promise made in this Agreement, or if any representation Argo made in this Agreement was false when made.

V. Review and Revocation

A. Review: I acknowledge that I may revoke this Agreement at any time within seven (7) days of the date on which I sign this Agreement. Further, I acknowledge that, before signing this Agreement, I was given a period of twenty-one (21) days in which to consider this Agreement. I further acknowledge that: (a) I took advantage of this period to consider this Agreement before signing it; (b) I carefully read this Agreement; (c) I fully understand it; and (d) I am entering into it voluntarily. I acknowledge that the Company encouraged me to discuss this Agreement with an attorney (at my own expense) before signing it, that I sought such advice to the extent I deemed appropriate. If I sign this Agreement before the end of the twenty-one (21) day period, it will be my voluntary decision to do so because I have decided that I do not need any additional time to decide whether to sign this Agreement.

B. Tender Back Provision: I acknowledge and agree that this Agreement may not be revoked at any time after the expiration of the seven (7) day revocation period described in Section I above and that I will not institute any suit, action or proceeding, whether at law or equity, challenging the enforceability of this Agreement. Should I ever attempt to challenge the terms of this Agreement, attempt to obtain an order declaring this Agreement to be null and void, or institute litigation against the Company or any other Released Party based upon a Claim which is covered by the terms of the release contained in Section II, I will as a condition precedent to such action repay all amounts paid to me or forgiven under the terms of this Agreement. Furthermore, if I do not prevail in an action to challenge this Agreement, to obtain an order declaring this Agreement to be null and void, or in any action against the Company or any other Released Party based upon a Claim which is covered by the release contained in Section II, I shall pay to the Company and/or the appropriate Released Party all their costs and attorneys’ fees incurred in their defense of my action. It is understood and agreed by me and the Company, however, that I shall not be required to repay the amounts paid to me under the terms of this Agreement or pay the Company and/or the appropriate Released Party all their costs and attorneys’ fees incurred in their defense of my action (except those attorneys’ fees or costs specifically authorized under federal or state law) in the event that I seek to challenge my waiver of claims under the Age Discrimination in Employment Act.

6

VI. Miscellaneous

A. Entire Agreement: This is the entire agreement between me and the Company. This Agreement may not be modified or canceled in any manner except by a writing signed by both me and an authorized Company official. I acknowledge that the Company has made no representations or promises to me (such as that my former position will remain vacant), other than those in this Release. If any provision in this Agreement is found to be unenforceable, all other provisions will remain fully enforceable.

B. Successors: This Agreement binds my heirs, administrators, representatives, executors, successors, and assigns, and will inure to the benefit of all Released Parties and their respective heirs, administrators, representatives, executors, successors, and assigns.

C. Interpretation: This Agreement shall be construed as a whole according to its fair meaning. It shall not be construed strictly for or against me or any Released Party. Unless the context indicates otherwise, the singular or plural number shall be deemed to include the other. Captions are intended solely for convenience of reference and shall not be used in the interpretation of this Release.

D. Governing Law and Enforcement: This Agreement shall be governed by the statutes and common law of the State of Texas.

TAKE THIS AGREEMENT HOME, READ IT, AND CAREFULLY CONSIDER ALL OF ITS PROVISIONS BEFORE SIGNING IT. IT INCLUDES A RELEASE OF KNOWN AND UNKNOWN CLAIMS. IF YOU WISH, YOU SHOULD TAKE ADVANTAGE OF THE FULL CONSIDERATION PERIOD AFFORDED BY SECTION V AND YOU SHOULD CONSULT YOUR ATTORNEY.

Executed on this 8^th day of May, 2013.

/s/ Barbara C. Bufkin

Barbara C. Bufkin

Executed on this 6^th day of May, 2013.

ARGO GROUP INTERNATIONAL HOLDINGS, LTD.
By:	/s/ Mark E. Watson III
Title:	President and Chief Executive Officer

7

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

	Three Months Ended March  31,				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	$	37.5	$	28.1	$	66.7	$	(61.9	)	$	121.9	$	139.1	$	79.6
Add:
Fixed charges		6.2		6.9		28.4		26.7			26.6		29.5		34.0
Total earnings	$	43.7	$	35.0	$	95.1	$	(35.2	)	$	148.5	$	168.6	$	113.6
Fixed charges:
Interest expense	$	4.9	$	5.7	$	23.7	$	22.1		$	22.9	$	25.7	$	29.9
Rental interest factor		1.3		1.2		4.7		4.6			3.7		3.8		4.1
Total fixed charges	$	6.2	$	6.9	$	28.4	$	26.7		$	26.6	$	29.5	$	34.0
Ratio of earnings to fixed charges		7.1:1		5.1:1		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: May 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: May 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 March 31, 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 May 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 March 31, 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 May 2013.

/s/ Jay S. Bullock

Jay S. Bullock

Executive Vice President and Chief Financial Officer

XML

Investments - Schedule of Amortized Cost and Fair Values of Fixed Maturity Investments, by Contractual Maturity (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 213.0
Amortized Cost, Due after one year through five years	1,117.7
Amortized Cost, Due after five years through ten years	714.3
Amortized Cost, Thereafter	237.5
Amortized Cost, Structured securities	557.4
Amortized Cost, Total	2,839.9
Fair Value, Due in one year or less	215.4
Fair Value, Due after one year through five years	1,150.6
Fair Value, Due after five years through ten years	776.4
Fair Value, Thereafter	249.1
Fair Value, Structured securities	581.1
Fair Value, Total	$ 2,972.6

XML

Income Taxes - Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Examination [Line Items]
Pre-tax income (loss)	$ 37.5	$ 28.1
Bermuda [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	16.1	0.3
Effective Tax Rate	0.00%	0.00%
United States [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	17.5	25.4
Effective Tax Rate	18.30%	27.90%
United Kingdom [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	6.0	4.7
Effective Tax Rate	25.50%	31.00%
Belgium [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	0	0.1
Effective Tax Rate	67.60%	27.80%
Brazil [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	(1.8)	(1.6)
Effective Tax Rate	0.00%	1.20%
Dubai [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	0	0
Effective Tax Rate	0.00%	0.00%
Ireland [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	0	(0.1)
Effective Tax Rate	0.00%	0.00%
Malta [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	(0.3)	(0.7)
Effective Tax Rate	0.00%	0.00%
Switzerland [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)	$ 0	$ 0
Effective Tax Rate	24.50%	24.40%

XML

Shareholders' Equity - Schedule of Repurchase of Shares (Parenthetical) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Share Repurchase Programs [Line Items]
Number of Shares Repurchased	325,825
Total Cost	$ 12.3
Total Number of Shares Repurchased	56,745
Total cost	2.3
Average Price of Shares Repurchased	$ 41.17
Rule 10b5-1 [Member]
Schedule Of Share Repurchase Programs [Line Items]
Number of Shares Repurchased		117,663
Total Cost	$ 9.9	$ 3.9
Total Number of Shares Repurchased	289,143
Total Average Price of Shares Repurchased	$ 34.58

XML

Segment Information - Revenue and (Loss) Income Before Income Taxes for Each Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Earned premiums	$ 304.2	$ 277.3
Net investment income	27.9	31.4
Fee income, net	0	1.3
Total segment income (loss) before taxes	32.4	25.7
Net realized investment (losses) gains	9.5	13.1
Total revenue	341.6	323.1
Net realized investment (losses) gains	9.5	13.1
Total income (loss) before income taxes	37.5	28.1
Excess and Surplus Lines [Member]
Segment Reporting Information [Line Items]
Earned premiums	105.1	96.2
Net investment income	10.9	13.0
Total segment income (loss) before taxes	13.9	18.9
Commercial Specialty [Member]
Segment Reporting Information [Line Items]
Earned premiums	75.2	82.0
Net investment income	5.9	6.9
Total segment income (loss) before taxes	5.7	(0.3)
International Specialty [Member]
Segment Reporting Information [Line Items]
Earned premiums	32.7	28.0
Net investment income	2.3	4.1
Total segment income (loss) before taxes	4.8	5.8
Syndicate 1200 [Member]
Segment Reporting Information [Line Items]
Earned premiums	90.9	71.1
Net investment income	2.8	3.9
Total segment income (loss) before taxes	8.4	1.7
Run-Off Lines [Member]
Segment Reporting Information [Line Items]
Earned premiums	0.3	0
Net investment income	2.8	3.5
Total segment income (loss) before taxes	(0.4)	(0.4)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net investment income	3.2	0
Net realized investment (losses) gains	(4.4)	(10.7)
Net realized investment (losses) gains	$ (4.4)	$ (10.7)

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
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Examination [Line Items]
Pre-tax income (loss)	$ 37.5	$ 28.1
Maximum [Member] | Switzerland [Member]
Income Tax Examination [Line Items]
Pre-tax income (loss)		$ 0.1

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

Shareholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Feb. 18, 2011 2007 Repurchase Authorization [Member]	Mar. 31, 2013 2011 Repurchase Authorization [Member]	Feb. 18, 2011 2011 Repurchase Authorization [Member]	Mar. 31, 2013 Open Market [Member]
Equity [Line Items]
Dividend declared per common share	$ 0.15	$ 0.12
Dividend payable, date declared	Feb. 15, 2013	Feb. 15, 2012
Cash dividends paid - common shares, total	$ 3.7	$ 3.1
Dividend payable, date of record	Mar. 01, 2013	Mar. 01, 2012
Common stock repurchase authorization, maximum			150.0		150.0
Common shares repurchased	325,825			6,934,145		97,600
Common stock repurchased, average cost per share	$ 41.17			$ 32.28
Common shares repurchased, total cost	12.3			223.7		3.9
Common stock repurchase authorization for future repurchases				$ 52.6

XML

Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2013

Supplemental Cash Flow Elements [Abstract]

Schedule of Interest Paid

Interest paid. Interest paid for the three months ended March 31, was as follows:

	For the Three Months Ended March 31,
(in millions)	2013		2012
Senior unsecured fixed rate notes	$	2.3	$	0.0
Other indebtedness		0.9		1.0
Junior subordinated debentures		1.9		6.9
Total interest paid	$	5.1	$	7.9

XML

Information Provided in Connection with Outstanding Debt of Subsidiaries - Condensed Consolidating Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Assets
Total Investments	$ 4,133.2	$ 4,200.7
Cash	91.2	95.8	91.1	102.7
Premiums receivable	365.6	361.0
Reinsurance recoverables	1,240.8	1,320.9
Goodwill and other intangible assets	243.8	245.3
Current income taxes receivable, net	13.6	12.9
Deferred acquisition costs, net	100.6	99.4
Ceded unearned premiums	230.9	193.6
Other assets	155.9	129.0
Due from affiliates	0	0
Intercompany note receivable	0	0
Investments in subsidiaries	0	0
Total assets	6,602.5	6,688.9
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	3,205.0	3,223.5
Unearned premiums	737.3	730.2
Funds held and ceded reinsurance payable, net	512.6	645.8
Long-term debt	401.5	400.9
Current income taxes payable, net	0	0
Deferred tax liabilities, net	57.3	43.8
Accrued underwriting expenses and other liabilities	142.2	130.6
Due to affiliates	0	0
Intercompany note payable	0	0
Total liabilities	5,055.9	5,174.8
Total shareholders' equity	1,546.6	1,514.1
Total liabilities and shareholders' equity	6,602.5	6,688.9
Argo Group International Holdings, Ltd (Parent Guarantor) [Member]
Assets
Total Investments	2.6	(0.9)
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	7.3	4.3
Due from affiliates	0	5.0
Intercompany note receivable	0	0
Investments in subsidiaries	1,661.8	1,621.1
Total assets	1,671.7	1,629.5
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	12.8	11.3
Due to affiliates	3.2	0
Intercompany note payable	60.1	55.1
Total liabilities	125.1	115.4
Total shareholders' equity	1,546.6	1,514.1
Total liabilities and shareholders' equity	1,671.7	1,629.5
Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer) [Member]
Assets
Total Investments	2,799.3	2,794.7
Cash	78.9	73.9	73.9	85.1
Premiums receivable	143.5	155.1
Reinsurance recoverables	1,159.6	1,155.1
Goodwill and other intangible assets	138.8	139.5
Current income taxes receivable, net	9.6	8.7
Deferred acquisition costs, net	52.1	54.6
Ceded unearned premiums	87.8	85.9
Other assets	111.6	104.0
Due from affiliates	9.7	1.2
Intercompany note receivable	130.4	119.6
Investments in subsidiaries	0	0
Total assets	4,721.3	4,692.3
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	2,205.1	2,226.3
Unearned premiums	410.5	415.6
Funds held and ceded reinsurance payable, net	622.1	598.4
Long-term debt	288.9	288.9
Current income taxes payable, net	0	0
Deferred tax liabilities, net	49.3	36.8
Accrued underwriting expenses and other liabilities	80.5	84.1
Due to affiliates	0	0
Intercompany note payable	0	0
Total liabilities	3,656.4	3,650.1
Total shareholders' equity	1,064.9	1,042.2
Total liabilities and shareholders' equity	4,721.3	4,692.3
Other Subsidiaries and Eliminations [Member]
Assets
Total Investments	1,331.3	1,406.9
Cash	12.3	21.9	17.2	17.6
Premiums receivable	222.1	205.9
Reinsurance recoverables	81.2	165.8
Goodwill and other intangible assets	105.0	105.8
Current income taxes receivable, net	4.0	4.2
Deferred acquisition costs, net	48.5	44.8
Ceded unearned premiums	143.1	107.7
Other assets	63.9	51.0
Due from affiliates	(9.7)	(1.2)
Intercompany note receivable	(130.4)	(119.6)
Investments in subsidiaries	0	0
Total assets	1,871.3	1,993.2
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	999.9	997.2
Unearned premiums	326.8	314.6
Funds held and ceded reinsurance payable, net	(109.5)	47.4
Long-term debt	63.6	63.0
Current income taxes payable, net	0	0
Deferred tax liabilities, net	8.0	7.0
Accrued underwriting expenses and other liabilities	48.9	35.2
Due to affiliates	0	0
Intercompany note payable	0	0
Total liabilities	1,337.7	1,464.4
Total shareholders' equity	533.6	528.8
Total liabilities and shareholders' equity	1,871.3	1,993.2
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	(1,661.8)	(1,621.1)
Total assets	(1,661.8)	(1,626.1)
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	(3.2)	0
Intercompany note payable	(60.1)	(55.1)
Total liabilities	(63.3)	(55.1)
Total shareholders' equity	(1,598.5)	(1,571.0)
Total liabilities and shareholders' equity	$ (1,661.8)	$ (1,626.1)

XML

Segment Information - Additional Information (Detail) (Syndicate 1200 [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Syndicate 1200 [Member]
Segment Reporting Information [Line Items]
Assets associated with trade capital providers	$ 355.8	$ 505.7

XML

Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 ARIS [Member]	Mar. 31, 2012 December 31, 2025 [Member]	Mar. 31, 2012 December 31, 2027 [Member]	Mar. 31, 2013 PXRE Reinsurance Company [Member]	Mar. 31, 2013 Malta [Member]	Mar. 31, 2013 Brazil [Member]
Income Tax Contingency [Line Items]
Total net deferred tax liabilities	$ 4.2
Capital loss carryforward	30.5
Net operating loss carryforward	18.7	1.0
Loss carryforwards, amounts expiring if not utilized			17.2	1.5
Valuation allowance	53.1
Loss carryforwards per year	2.8
Reduced valuation allowance					0.2
Increased valuation allowance						$ 0.1	$ 0.7

XML

Disclosures about Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial Instruments Owned and Pledged as Collateral [Line Items]
Premiums receivable	$ 365.6	$ 361.0
Reinsurance recoverable	1,240.8	1,320.9
Over 90 Days [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Premiums receivable	25.3	24.3
Reinsurance recoverable	16.2	18.0
Premiums receivable, allowance for doubtful accounts	3.1	2.5
Reinsurance recoverables, allowance for doubtful accounts	2.2	2.2
Premiums receivable, secured by collateral	0.7	0.4
Reinsurance recoverables, secured by collateral	$ 3	$ 3

XML

Information Provided in Connection with Outstanding Debt of Subsidiaries - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	$ (84.0)	$ (6.0)
Cash flows from investing activities:
Proceeds from sales of investments	436.2	404.8
Proceeds from maturities and mandatory calls of investments	115.1	106.5
Purchases of investments	(442.8)	(508.4)
Change in short-term investments and foreign regulatory deposits	(1.2)	1.3
Settlements of foreign currency exchange forward contracts	(1.9)	(0.6)
Issuance of intercompany note, net	0	0
Other, net	(1.3)	(4.3)
Cash provided (used) by investing activities	94.7	6.5
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	1.3	0
Repurchase of Company's common shares	(12.9)	(9.3)
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	(3.7)	(3.1)
Cash used by financing activities	(15.3)	(12.4)
Effect of exchange rate changes on cash	0	0.3
Change in cash	(4.6)	(11.6)
Cash, beginning of period	95.8	102.7
Cash, end of period	91.2	91.1
Argo Group International Holdings, Ltd (Parent Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	(0.5)	(9.3)
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	(2.2)	(0.6)
Settlements of foreign currency exchange forward contracts	0.2	0.3
Issuance of intercompany note, net	0	0
Other, net	0	0
Cash provided (used) by investing activities	(2.0)	(0.3)
Cash flows from financing activities:
Borrowings under intercompany note, net	4.9	12.7
Proceeds from issuance of senior unsecured fixed rate notes	1.3	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	(3.7)	(3.1)
Cash used by financing activities	2.5	9.6
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	2.7	7.5
Cash flows from investing activities:
Proceeds from sales of investments	199.0	224.6
Proceeds from maturities and mandatory calls of investments	86.7	72.7
Purchases of investments	(282.9)	(321.3)
Change in short-term investments and foreign regulatory deposits	28.6	35.7
Settlements of foreign currency exchange forward contracts	0	0
Issuance of intercompany note, net	(10.0)	(15.0)
Other, net	(6.2)	(6.1)
Cash provided (used) by investing activities	15.2	(9.4)
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	0	0
Repurchase of Company's common shares	(12.9)	(9.3)
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	0	0
Cash used by financing activities	(12.9)	(9.3)
Effect of exchange rate changes on cash	0	0
Change in cash	5.0	(11.2)
Cash, beginning of period	73.9	85.1
Cash, end of period	78.9	73.9
Other Subsidiaries and Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	(86.2)	(4.2)
Cash flows from investing activities:
Proceeds from sales of investments	237.2	180.2
Proceeds from maturities and mandatory calls of investments	28.4	33.8
Purchases of investments	(159.9)	(187.1)
Change in short-term investments and foreign regulatory deposits	(32.8)	(17.4)
Settlements of foreign currency exchange forward contracts	(2.1)	(0.9)
Issuance of intercompany note, net	5.1	2.3
Other, net	0.7	(7.4)
Cash provided (used) by investing activities	76.6	3.5
Cash flows from financing activities:
Borrowings under intercompany note, net	0	0
Proceeds from issuance of senior unsecured fixed rate notes	(1.3)	0
Activity under stock incentive plans	1.3	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	0	0
Effect of exchange rate changes on cash	0	0.3
Change in cash	(9.6)	(0.4)
Cash, beginning of period	21.9	17.6
Cash, end of period	12.3	17.2
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	0
Issuance of intercompany note, net	4.9	12.7
Other, net	0	0
Cash provided (used) by investing activities	4.9	12.7
Cash flows from financing activities:
Borrowings under intercompany note, net	(4.9)	(12.7)
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	(4.9)	(12.7)
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

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	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	$ 401.5	$ 400.9
Fair Value	351.9	345.1
Junior Subordinated Debentures [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	193.3	193.3
Fair Value	156.6	151.8
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	143.8	143.8
Fair Value	143.2	143.2
Other Indebtedness [Member] | Floating Rate Loan Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Amount	63.6	63.0
Fair Value	51.5	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

Segment Information - Schedule of Earned Premiums by Geographic Location (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Total earned premiums	$ 304.2	$ 277.3
Bermuda [Member]
Segment Reporting Information [Line Items]
Total earned premiums	25.8	22.3
Brazil [Member]
Segment Reporting Information [Line Items]
Total earned premiums	10.0	6.5
Malta [Member]
Segment Reporting Information [Line Items]
Total earned premiums	0.4	0
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total earned premiums	87.0	70.3
United States [Member]
Segment Reporting Information [Line Items]
Total earned premiums	$ 181.0	$ 178.2

XML

Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 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

⁽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.

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Net Income Per Common Share - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Earnings Per Share [Abstract]
Treasury shares	6,785,438	5,310,181	6,459,613
Antidilutive securities excluded from computation of diluted net income per share, shares	214,453	1,200,366

XML

Investments - Schedule of Company's Gross Realized Investment Gains (Losses) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Investments [Line Items]
Gross realized investment and other gains	$ 23.2	$ 20.0
Gross realized investment and other losses	(13.7)	(6.9)
Net realized investment gains	9.5	13.1
Fixed Maturities [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	11.5	8.3
Gross realized investment and other losses	(6.5)	(2.9)
Equity Securities [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	0.5	0
Gross realized investment and other losses	0	(0.1)
Other Investments [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	11.1	11.5
Gross realized investment and other losses	(2.3)	(3.8)
Short-Term Investments [Member]
Schedule of Investments [Line Items]
Gross realized investment and other gains	0.1	0.2
Gross realized investment and other losses	(0.1)	0
Other-Than-Temporary Impairment Losses On Equity Securities [Member]
Schedule of Investments [Line Items]
Gross realized investment and other losses	(1.4)	(0.1)
Other Than Temporary Impairment Losses On Other Investments [Member]
Schedule of Investments [Line Items]
Gross realized investment and other losses	$ (3.4)	$ 0

XML

Supplemental Cash Flow Information - Schedule of Interest Paid (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest Paid [Abstract]
Senior unsecured fixed rate notes	$ 2.3	$ 0
Other indebtedness	0.9	1.0
Junior subordinated debentures	1.9	6.9
Total interest paid	$ 5.1	$ 7.9

XML

Investments - Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Investments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 3,804.7	$ 3,895.7
Gross Unrealized Gains	347.7	325.1
Gross Unrealized Losses	19.2	20.1
Fair Value	4,133.2	4,200.7
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,839.9	2,993.1
Gross Unrealized Gains	147.4	170.8
Gross Unrealized Losses	14.7	9.9
Fair Value	2,972.6	3,154.0
Fixed Maturities [Member] | U.S. Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	354.3	401.1
Gross Unrealized Gains	6.5	9.3
Gross Unrealized Losses	0	0
Fair Value	360.8	410.4
Fixed Maturities [Member] | Non-U.S. Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54.5	53.1
Gross Unrealized Gains	1.8	3.6
Gross Unrealized Losses	0.6	0.1
Fair Value	55.7	56.6
Fixed Maturities [Member] | Obligations Of States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	614.7	551.7
Gross Unrealized Gains	43.9	44.9
Gross Unrealized Losses	1.0	0.5
Fair Value	657.6	596.1
Fixed Maturities [Member] | Credit-Financial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	356.5	382.4
Gross Unrealized Gains	23.8	25.7
Gross Unrealized Losses	0.5	0.7
Fair Value	379.8	407.4
Fixed Maturities [Member] | Credit-Industrial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	394.3	428.4
Gross Unrealized Gains	26.7	31.1
Gross Unrealized Losses	0.9	0.7
Fair Value	420.1	458.8
Fixed Maturities [Member] | Credit-Utility [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	181.3	189.9
Gross Unrealized Gains	11.6	12.6
Gross Unrealized Losses	0.5	0.4
Fair Value	192.4	202.1
Fixed Maturities [Member] | CMO/MBS-Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	331.8	375.1
Gross Unrealized Gains	17.6	20.2
Gross Unrealized Losses	0.4	0.2
Fair Value	349.0	395.1
Fixed Maturities [Member] | CMO/MBS-Non Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11.3	12.5
Gross Unrealized Gains	1.2	1.0
Gross Unrealized Losses	0	0.2
Fair Value	12.5	13.3
Fixed Maturities [Member] | CMBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	113.1	109.5
Gross Unrealized Gains	4.7	5.7
Gross Unrealized Losses	0.2	0.2
Fair Value	117.6	115.0
Fixed Maturities [Member] | ABS-Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9.1	10.1
Gross Unrealized Gains	0.3	0.2
Gross Unrealized Losses	0.7	0.8
Fair Value	8.7	9.5
Fixed Maturities [Member] | ABS-Non Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	92.1	81.3
Gross Unrealized Gains	1.2	1.2
Gross Unrealized Losses	0	0
Fair Value	93.3	82.5
Fixed Maturities [Member] | Foreign Denominated, Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	203.3	262.1
Gross Unrealized Gains	4.5	9.2
Gross Unrealized Losses	6.6	4.3
Fair Value	201.2	267.0
Fixed Maturities [Member] | Foreign Denominated, Credit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	123.6	135.9
Gross Unrealized Gains	3.6	6.1
Gross Unrealized Losses	3.3	1.8
Fair Value	123.9	140.2
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	415.3	383.5
Gross Unrealized Gains	197.4	153.0
Gross Unrealized Losses	3.5	5.1
Fair Value	609.2	531.4
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	315.3	284.8
Gross Unrealized Gains	2.9	1.2
Gross Unrealized Losses	0.8	5.0
Fair Value	317.4	281.0
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	234.2	234.3
Gross Unrealized Gains	0	0.1
Gross Unrealized Losses	0.2	0.1
Fair Value	$ 234.0	$ 234.3

XML

Accumulated Other Comprehensive Income - Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Unrealized gains and losses on securities
Net realized investment gains	$ (0.7)	$ (5.4)
Provision for income taxes	(0.1)	1.6
Net of taxes	$ (0.8)

XML

Derivative Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jun. 18, 2011	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	5.1	6.9
Other assets	$ 3.6					$ 6.9

XML

Share-based Compensation - Summary of Restricted Share Units Activity Under 2007 Plan (Detail) (Restricted Share Units [Member], USD $)	3 Months Ended
	Mar. 31, 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	67,100
Vested and issued, Shares	(50,499)
Expired or forfeited, Shares	(5,244)
Shares, Outstanding at March 31, 2013	247,496
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 29.76
Granted, Weighted-Average Grant Date Fair Value	$ 38.42
Vested and issued, Weighted-Average Grant Date Fair Value	$ 30.40
Expired or forfeited, Weighted-Average Grant Date Fair Value	$ 29.65
Weighted-Average Exercise Price, Outstanding at March 31, 2013	$ 32.30

XML

Shareholders' Equity - Schedule of Repurchase of Shares (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Schedule Of Share Repurchase Programs [Line Items]
Number of Shares Repurchased	325,825
Average Price of Shares Repurchased	$ 41.17
Total Cost	$ 12.3
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

XML

Investments

3 Months Ended

Mar. 31, 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 March 31, 2013 and December 31, 2012 were as follows:

March 31, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	354.3	$	6.5	$	0.0	$	360.8
Non-U.S. Governments		54.5		1.8		0.6		55.7
Obligations of states and political subdivisions		614.7		43.9		1.0		657.6
Credit-Financial		356.5		23.8		0.5		379.8
Credit-Industrial		394.3		26.7		0.9		420.1
Credit-Utility		181.3		11.6		0.5		192.4
Structured securities:
CMO/MBS-agency (1)		331.8		17.6		0.4		349.0
CMO/MBS-non agency		11.3		1.2		0.0		12.5
CMBS (2)		113.1		4.7		0.2		117.6
ABS-residential (3)		9.1		0.3		0.7		8.7
ABS-non residential		92.1		1.2		0.0		93.3
Foreign denominated:
Governments		203.3		4.5		6.6		201.2
Credit		123.6		3.6		3.3		123.9
Total fixed maturities		2,839.9		147.4		14.7		2,972.6
Equity securities		415.3		197.4		3.5		609.2
Other investments		315.3		2.9		0.8		317.4
Short-term investments		234.2		0.0		0.2		234.0
Total investments	$	3,804.7	$	347.7	$	19.2	$	4,133.2
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 March 31, 2013 and December 31, 2012 is $103.7 million and $143.9 million, respectively, of assets 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 March 31, 2013, by contractual maturity, were as follows:

(in millions)	Amortized Cost		Fair Value
Due in one year or less	$	213.0	$	215.4
Due after one year through five years		1,117.7		1,150.6
Due after five years through ten years		714.3		776.4
Thereafter		237.5		249.1
Structured securities		557.4		581.1
Total	$	2,839.9	$	2,972.6

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 March 31, 2013 and December 31, 2012 is presented below:

March 31, 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 (1)	$	15.6		$	0.0	$	0.0	$	0.0	$	15.6		$	0.0
Non-U.S. Governments (2)		20.0			0.6		0.2		0.0		20.2			0.6
Obligations of states and political subdivisions		55.7			0.9		0.8		0.1		56.5			1.0
Credit-Financial		24.1			0.1		1.7		0.4		25.8			0.5
Credit-Industrial		43.5			0.8		0.9		0.1		44.4			0.9
Credit-Utility		15.0			0.3		0.8		0.2		15.8			0.5
Structured securities:
CMO/MBS-agency (2)		25.0			0.4		1.0		0.0		26.0			0.4
CMBS		16.3			0.2		0.0		0.0		16.3			0.2
ABS-residential		0.0			0.0		4.7		0.7		4.7			0.7
ABS-non residential (1) (2)		23.2			0.0		0.2		0.0		23.4			0.0
Foreign denominated:
Governments		133.8			6.6		0.0		0.0		133.8			6.6
Credit		108.2			3.3		0.0		0.0		108.2			3.3
Total fixed maturities		480.4			13.2		10.3		1.5		490.7			14.7
Equity securities		40.9			3.5		0.0		0.0		40.9			3.5
Other investments		(0.8	)		0.8		0.0		0.0		(0.8	)		0.8
Short-term investments		0.0			0.2		0.0		0.0		0.0			0.2
Total	$	520.5		$	17.7	$	10.3	$	1.5	$	530.8		$	19.2

⁽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.

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 6,418 securities, of which 1,034 were in an unrealized loss position for less than one year and 33 were in an unrealized loss position for a period one year or greater as of March 31, 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 March 31, 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 did not recognize any other-than-temporary losses on our fixed maturities portfolio for the three months ended March 31, 2013 and 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 $1.4 million and $0.1 million for the three months ended March 31, 2013 and 2012, respectively. We recognized other-than-temporary losses on our other investments of $3.4 million for the three months ended March 31, 2013. We did not recognize any other-than-temporary losses on our other investments in 2012. In situations where we did not recognize any 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 months ended March 31:

(in millions)	For the Three Months Ended March 31,
	2013			2012
Realized gains
Fixed maturities	$	11.5		$	8.3
Equity securities		0.5			0.0
Other investments		11.1			11.5
Short-term investments		0.1			0.2
Gross realized gains		23.2			20.0
Realized losses
Fixed maturities		(6.5	)		(2.9	)
Equity securities		0.0			(0.1	)
Other investments		(2.3	)		(3.8	)
Short-term investments		(0.1	)		0.0
Other-than-temporary impairment losses on equity securities		(1.4	)		(0.1	)
Other-than-temporary impairment losses on other investments		(3.4	)		0.0
Gross realized losses		(13.7	)		(6.9	)
Net realized investment gains	$	9.5		$	13.1

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 unrealized gains on bonds of nil and $0.1 million were offset by foreign exchange realized losses on forwards of nil and $0.1 million for the three months ended March 30, 2013 and 2012, respectively, and are reflected in realized gains and losses in the Consolidated Statements of Income and in the table above. As of March 31, 2013 and 2012, we hedged $1.7 million and $3.0 million, respectively, of certain holdings in non-U.S. Dollar denominated fixed maturity investments with $1.5 million and $2.8 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 $73.7 million and $132.8 million as of March 31, 2013 and 2012, respectively. The fair value of the currency forward contracts was a loss of $0.6 million and a loss of $1.4 million as of March 31, 2013 and 2012, respectively. For the three months ended March 31, 2013 and 2012, we recognized $1.6 million and $3.2 million in realized gains and $2.3 million and $3.3 million in realized losses, respectively, from the currency forward contracts.

Regulatory Deposits, Pledged Securities and Letters of Credit

At March 31, 2013, the amortized cost and fair value of investments on deposit for regulatory purposes and reinsurance were $212.8 million and $228.8 million, respectively.

Investments with an amortized cost of $249.1 million and fair value of $253.2 million were pledged as collateral in support of irrevocable letters of credit at March 31, 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 $64.8 million and $124.9 million for our Corporate member’s capital as security to support the underwriting business at Lloyd’s.

At March 31, 2013, our Corporate member’s capital supporting our Lloyd’s business consisted of:

Letters of credit	$	124.9
Fixed maturities, at fair value		165.5
Short-term investments, at fair value		3.4
Total securities and letters of credit pledged to Lloyd’s	$	293.8

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 March 31, 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.

• 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.

Transfers Between Level 1 and Level 2 Securities: There were no transfers between Level 1 and Level 2 securities during the three month period ended March 31, 2013.

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 valuation is 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. There were no transfers of other investments between Level 1 and Level 2 for the three months ended March 31, 2013.

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. Included in short-term investments are Funds at Lloyd’s, which represent a portion of our Corporate member’s capital as security to support the underwriting business at Lloyd’s and principally short-term money market accounts. There were no transfers of short-term investments between Level 1 and Level 2 for the three months ended March 31, 2013.

Other Assets Level 3: We have one reinsurance contract deemed a derivative in 2013 and two reinsurance contracts deemed derivatives in 2012. The fair value was 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.

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

(in millions)	March 31, 2013		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	360.8	$	183.4	$	177.4	$	0.0
Non-U.S. Governments		55.7		0.0		55.7		0.0
Obligations of states and political subdivisions		657.6		0.0		657.6		0.0
Credit-Financial		379.8		0.0		379.8		0.0
Credit-Industrial		420.1		0.0		420.1		0.0
Credit-Utility		192.4		0.0		192.4		0.0
Structured securities:
CMO/MBS-agency		349.0		0.0		349.0		0.0
CMO/MBS-non agency		12.5		0.0		12.5		0.0
CMBS		117.6		0.0		117.6		0.0
ABS-residential		8.7		0.0		8.7		0.0
ABS-non residential		93.3		0.0		93.3		0.0
Foreign denominated:
Governments		201.2		0.0		201.2		0.0
Credit		123.9		0.0		123.9		0.0
Total fixed maturities		2,972.6		183.4		2,789.2		0.0
Equity securities		609.2		528.8		78.6		1.8
Other investments		139.2		0.0		139.2		0.0
Short-term investments		234.0		201.7		32.3		0.0
Other assets		3.6		0.0		0.0		3.6
	$	3,958.6	$	913.9	$	3,039.3	$	5.4

^(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 March 31, 2013 and December 31, 2012 are as follows:

(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		0.0		0.0			0.0
Purchases, issuances, sales, and settlements
Purchases		0.0		0.0			0.0
Issuances		0.0		0.0			0.0
Sales		0.0		(3.3	)		(3.3	)
Settlements		0.0		0.0			0.0
Ending balance, March 31, 2013	$	1.8	$	3.6		$	5.4
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 March 31, 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	)		(2.1	)		(3.5	)
Settlements		0.0			0.0			0.0			0.0
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 March 31, 2013 and December 31, 2012, we did not have any financial assets or financial liabilities measured at fair value on a nonrecurring basis.

XML

Share-based Compensation - Summary of Stock-Settled SARs Activity Under 2007 Plan (Detail) (Stock-Settled SARs Activity [Member], USD $)	3 Months Ended
	Mar. 31, 2013
Stock-Settled SARs Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	1,154,087
Granted, Shares	271,777
Exercised, shares	(30,706)
Expired or forfeited, Shares	(46,793)
Shares, Outstanding at March 31, 2013	1,348,365
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 29.74
Granted, Weighted-Average Exercise Price	$ 40.08
Exercised, Weighted-Average Exercise Price	$ 29.10
Expired or forfeited, Weighted-Average Exercise Price	$ 30.58
Weighted-Average Exercise Price, Outstanding at March 31, 2013	$ 31.81

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	Mar. 31, 2013
Investments Debt And Equity Securities [Abstract]
Letters of credit	$ 124.9
Fixed maturities, at fair value	165.5
Short-term investments, at fair value	3.4
Total securities and letters of credit pledged to Lloyd's	$ 293.8

XML

Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Assumptions

The following table summarizes the assumptions we used for the three months ended March 31, 2013 and 2012:

	2013			2012
Risk-free rate of return		0.80	%		1.09	%
Expected dividend yields		1.64	%		1.67	%
Expected award life (years)		5.07			5.03
Expected volatility		31.9	%		32.6	%

2007 Plan [Member]

Summary of Option Activity Under Amended Plan

A summary of option activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		388,187		$	36.90
Granted		0		$	0.00
Exercised		(35,239	)	$	35.45
Expired or forfeited		(42,670	)	$	37.77
Outstanding at March 31, 2013		310,278		$	36.95

Summary of Restricted Share Units Activity Under 2007 Plan

A summary of restricted share activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		236,139		$	29.76
Granted		67,100		$	38.42
Vested and issued		(50,499	)	$	30.40
Expired or forfeited		(5,244	)	$	29.65
Outstanding at March 31, 2013		247,496		$	32.30

Summary of Stock-Settled SARs Activity Under 2007 Plan

A summary of stock-settled SARs activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,154,087		$	29.74
Granted		271,777		$	40.08
Exercised		(30,706	)	$	29.10
Expired or forfeited		(46,793	)	$	30.58
Outstanding at March 31, 2013		1,348,365		$	31.81

Summary of Cash-Settled SARs Activity Under 2007 Plan

A summary of cash-settled SARs activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,745,614		$	29.95
Granted		481,393		$	40.08
Exercised		(156,031	)	$	29.15
Expired or forfeited		(112,882	)	$	29.60
Outstanding at March 31, 2013		1,958,094		$	32.53

Amended Plan [Member]

Summary of Option Activity Under Amended Plan

A summary of option activity under the Amended Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		201,505		$	38.00
Granted		0		$	0.00
Exercised		(76,772	)	$	34.16
Expired or forfeited		0		$	0.00
Outstanding at March 31, 2013		124,733		$	40.37

XML

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2013

Income Tax Disclosure [Abstract]

Income Tax Provision (Benefit)

Our income tax provision includes the following components:

	For the Three Months Ended March 31,
(in millions)	2013		2012
Current tax provision	$	1.8	$	3.6
Deferred tax provision related to:
Future tax deductions		2.4		4.4
Valuation allowance change		0.6		0.5
Income tax provision	$	4.8	$	8.5

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

For the three months ended March 31, 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 March 31,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	16.1			0.0	%	$	0.3			0.0	%
United States		17.5			18.3	%		25.4			27.9	%
United Kingdom		6.0			25.5	%		4.7			31.0	%
Belgium		0.0	(1)		-67.6	%		0.1			27.8	%
Brazil		(1.8	)		0.0	%		(1.6	)		1.2	%
Dubai		0.0			0.0	%		0.0	(1)		0.0	%
Ireland		0.0			0.0	%		(0.1	)		0.0	%
Malta		(0.3	)		0.0	%		(0.7	)		0.0	%
Switzerland		0.0	(1)		24.5	%		0.0	(1)		24.4	%
Pre-tax income (loss)	$	37.5					$	28.1

(1) 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 months ended March 31, 2013 and 2012 is as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Income tax provision at expected rate	$	6.7		$	9.3
Tax effect of:
Tax-exempt interest		(1.4	)		(1.4	)
Dividends received deduction		(0.6	)		(0.4	)
Valuation allowance change		0.6			0.5
Other permanent adjustments, net		(0.9	)		0.5
Adjustment for annualized rate		0.4			(0.2	)
United States state tax benefit		(0.2	)		(0.1	)
Foreign exchange adjustments		0.2			0.3
Income tax provision	$	4.8		$	8.5
Income tax provision - Foreign	$	1.6		$	1.4
Income tax provision - United States Federal		3.5			7.2
Income tax benefit - United States State		(0.3	)		(0.1	)
Income tax provision	$	4.8		$	8.5

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
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Examination [Line Items]
Income tax provision at expected rate	$ 6.7	$ 9.3
Tax-exempt interest	(1.4)	(1.4)
Dividends received deduction	(0.6)	(0.4)
Valuation allowance change	0.6	0.5
Other permanent adjustments, net	(0.9)	0.5
Adjustment for annualized rate	0.4	(0.2)
United States state tax benefit	(0.2)	(0.1)
Foreign exchange adjustments	0.2	0.3
Income tax provision	4.8	8.5
Foreign Country [Member]
Income Tax Examination [Line Items]
Income tax provision	1.6	1.4
United States Federal [Member]
Income Tax Examination [Line Items]
Income tax provision	3.5	7.2
United States State [Member]
Income Tax Examination [Line Items]
Income tax provision	$ (0.3)	$ (0.1)

XML

Investments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 4,133.2	$ 4,200.7
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3,958.6
Fixed Maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,972.6	3,154.0
Fixed Maturities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,972.6	3,154.0
Fixed Maturities [Member] | U.S. Governments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	360.8	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	360.8	410.4
Fixed Maturities [Member] | Non-U.S. Governments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	55.7	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	55.7	56.6
Fixed Maturities [Member] | Obligations Of States And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	657.6	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	657.6	596.1
Fixed Maturities [Member] | Credit-Financial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	379.8	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	379.8	407.4
Fixed Maturities [Member] | Credit-Industrial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	420.1	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	420.1	458.8
Fixed Maturities [Member] | Credit-Utility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	192.4	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	192.4	202.1
Fixed Maturities [Member] | CMO/MBS-Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	349.0	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	349.0	395.1
Fixed Maturities [Member] | CMO/MBS-Non Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	12.5	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	12.5	13.3
Fixed Maturities [Member] | CMBS [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	117.6	115.0
Fixed Maturities [Member] | CMBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	117.6	115.0
Fixed Maturities [Member] | ABS-Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	8.7	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	8.7	9.5
Fixed Maturities [Member] | ABS-Non Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	93.3	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	93.3	82.5
Fixed Maturities [Member] | Foreign Denominated, Governments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	201.2	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	201.2	267.0
Fixed Maturities [Member] | Foreign Denominated, Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	123.9	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	123.9	140.2
Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	609.2	531.4
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	609.2	531.4
Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	317.4	281.0
Other Investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	139.2	132.0
Short-Term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	234.0	234.3
Short-Term Investments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	234.0	234.3
Other Assets [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3.6	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	913.9
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	183.4	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	183.4	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	528.8	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	201.7	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	3,039.3
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	2,789.2	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	177.4	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	55.7	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	657.6	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	379.8	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	420.1	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	192.4	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	349.0	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	12.5	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	117.6	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	8.7	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	93.3	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	201.2	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	123.9	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	78.6	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	139.2	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	32.3	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	5.4
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	1.8	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	$ 3.6	$ 6.9

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Reserves for Losses and Loss Adjustment Expenses (Tables)

3 Months Ended

Mar. 31, 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 $0.0 million and $59.2 million as of March 31, 2013 and 2012, respectively:

	For the Three Months Ended March 31,
(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 calendar year, net of reinsurance:
Current accident year		175.0			169.1
Prior accident years		(4.5	)		(3.3	)
Losses and LAE incurred during calendar year, net of reinsurance		170.5			165.8
Deduct:
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year		21.9			22.6
Prior accident years		159.7			153.1
Losses and LAE payments made during current calendar year, net of reinsurance:		181.6			175.7
Change in participation interest (2)		10.4			(3.1	)
Foreign exchange adjustments		(6.5	)		0.9
Net reserves - end of period		2,103.7			2,337.6
Add:
Reinsurance recoverables on unpaid losses and LAE, end of period		1,101.3			929.6
Gross reserves - end of period	$	3,205.0		$	3,267.2

(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.

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Underwriting, Acquisition and Insurance Expenses (Tables)

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Underwriting, Acquisition and Insurance Expenses

Underwriting, acquisition and insurance expenses for the three months ended March 31, 2013 and 2012 were as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Commissions	$	51.9		$	49.4
General expenses		68.7			60.5
Premium taxes, boards and bureaus		6.8			6.1
		127.4			116.0
Net (deferral) amortization of policy acquisition costs		(0.7	)		(2.3	)
Total underwriting, acquisition and insurance expenses	$	126.7		$	113.7

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Recently Issued Accounting Standards

3 Months Ended

Mar. 31, 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 is 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 is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is 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. We do not anticipate that this update will have an impact on our financial results and disclosures.

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 are 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.

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Segment Information (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2013 and 2012 were as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Revenue:
Earned premiums
Excess and Surplus Lines	$	105.1		$	96.2
Commercial Specialty		75.2			82.0
International Specialty		32.7			28.0
Syndicate 1200		90.9			71.1
Run-off Lines		0.3			0.0
Total earned premiums		304.2			277.3
Net investment income
Excess and Surplus Lines		10.9			13.0
Commercial Specialty		5.9			6.9
International Specialty		2.3			4.1
Syndicate 1200		2.8			3.9
Run-off Lines		2.8			3.5
Corporate and Other		3.2			0.0
Total net investment income		27.9			31.4
Fee income, net		0.0			1.3
Net realized investment gains		9.5			13.1
Total revenue	$	341.6		$	323.1
	For the Three Months Ended March 31,
(in millions)	2013			2012
Income (loss) before income taxes
Excess and Surplus Lines	$	13.9		$	18.9
Commercial Specialty		5.7			(0.3	)
International Specialty		4.8			5.8
Syndicate 1200		8.4			1.7
Run-off Lines		(0.4	)		(0.4	)
Total segment income (loss) before taxes		32.4			25.7
Corporate and Other		(4.4	)		(10.7	)
Net realized investment and other gains		9.5			13.1
Total income (loss) before income taxes	$	37.5		$	28.1

Schedule of Earned Premiums by Geographic Location

The table below presents earned premiums by geographic location for the three months ended March 31, 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 March 31,
(in millions)	2013		2012
Bermuda	$	25.8	$	22.3
Brazil		10.0		6.5
Malta		0.4		0.0
United Kingdom		87.0		70.3
United States		181.0		178.2
Total earned premiums	$	304.2	$	277.3

Identifiable Assets

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

(in millions)	March 31, 2013		December 31, 2012
Excess and Surplus Lines	$	2,227.1	$	2,206.7
Commercial Specialty		1,307.2		1,337.7
International Specialty		753.2		731.8
Syndicate 1200		1,670.4		1,811.4
Run-off Lines		565.6		516.5
Corporate and Other		79.0		84.8
Total	$	6,602.5	$	6,688.9

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Investments - Schedule of Aging of Unrealized Losses on Investments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	$ 520.5	$ 490.3
Unrealized Losses, Less Than One Year	17.7	17.0
Fair Value, One Year or Greater	10.3	28.2
Unrealized Losses, One Year or Greater	1.5	3.1
Fair Value, Total	530.8	518.5
Unrealized Losses, Total	19.2	20.1
Fixed Maturities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	480.4	418.5
Unrealized Losses, Less Than One Year	13.2	7.7
Fair Value, One Year or Greater	10.3	21.9
Unrealized Losses, One Year or Greater	1.5	2.2
Fair Value, Total	490.7	440.4
Unrealized Losses, Total	14.7	9.9
Fixed Maturities [Member] | U.S. Governments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	15.6	11.9
Unrealized Losses, Less Than One Year	0	0
Fair Value, One Year or Greater	0	0
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	15.6	11.9
Unrealized Losses, Total	0	0
Fixed Maturities [Member] | Non-US Governments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	20.0	8.5
Unrealized Losses, Less Than One Year	0.6	0.1
Fair Value, One Year or Greater	0.2	0.5
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	20.2	9.0
Unrealized Losses, Total	0.6	0.1
Fixed Maturities [Member] | Obligations Of States And Political Subdivisions [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	55.7	28.2
Unrealized Losses, Less Than One Year	0.9	0.3
Fair Value, One Year or Greater	0.8	0.8
Unrealized Losses, One Year or Greater	0.1	0.2
Fair Value, Total	56.5	29.0
Unrealized Losses, Total	1.0	0.5
Fixed Maturities [Member] | Credit-Financial [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	24.1	25.0
Unrealized Losses, Less Than One Year	0.1	0.2
Fair Value, One Year or Greater	1.7	8.6
Unrealized Losses, One Year or Greater	0.4	0.5
Fair Value, Total	25.8	33.6
Unrealized Losses, Total	0.5	0.7
Fixed Maturities [Member] | Credit-Industrial [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	43.5	32.2
Unrealized Losses, Less Than One Year	0.8	0.4
Fair Value, One Year or Greater	0.9	3.0
Unrealized Losses, One Year or Greater	0.1	0.3
Fair Value, Total	44.4	35.2
Unrealized Losses, Total	0.9	0.7
Fixed Maturities [Member] | Credit-Utility [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	15.0	8.4
Unrealized Losses, Less Than One Year	0.3	0.2
Fair Value, One Year or Greater	0.8	0.8
Unrealized Losses, One Year or Greater	0.2	0.2
Fair Value, Total	15.8	9.2
Unrealized Losses, Total	0.5	0.4
Fixed Maturities [Member] | CMO/MBS-Agency [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	25.0	26.4
Unrealized Losses, Less Than One Year	0.4	0.2
Fair Value, One Year or Greater	1.0	0.3
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	26.0	26.7
Unrealized Losses, Total	0.4	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	16.3	5.7
Unrealized Losses, Less Than One Year	0.2	0
Fair Value, One Year or Greater	0	3.5
Unrealized Losses, One Year or Greater	0	0.2
Fair Value, Total	16.3	9.2
Unrealized Losses, Total	0.2	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	4.7	3.9
Unrealized Losses, One Year or Greater	0.7	0.8
Fair Value, Total	4.7	3.9
Unrealized Losses, Total	0.7	0.8
Fixed Maturities [Member] | ABS-Non Residential [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	23.2	13.7
Unrealized Losses, Less Than One Year	0	0
Fair Value, One Year or Greater	0.2	0.2
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	23.4	13.9
Unrealized Losses, Total	0	0
Fixed Maturities [Member] | Foreign Denominated, Governments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	133.8	180.5
Unrealized Losses, Less Than One Year	6.6	4.3
Fair Value, One Year or Greater	0	0.3
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	133.8	180.8
Unrealized Losses, Total	6.6	4.3
Fixed Maturities [Member] | Foreign Denominated, Credit [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	108.2	76.3
Unrealized Losses, Less Than One Year	3.3	1.8
Fair Value, One Year or Greater	0	0
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	108.2	76.3
Unrealized Losses, Total	3.3	1.8
Equity Securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	40.9	60.2
Unrealized Losses, Less Than One Year	3.5	4.2
Fair Value, One Year or Greater	0	6.3
Unrealized Losses, One Year or Greater	0	0.9
Fair Value, Total	40.9	66.5
Unrealized Losses, Total	3.5	5.1
Other Investments [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than One Year	(0.8)	11.6
Unrealized Losses, Less Than One Year	0.8	5.0
Fair Value, One Year or Greater	0	0
Unrealized Losses, One Year or Greater	0	0
Fair Value, Total	(0.8)	11.6
Unrealized Losses, Total	0.8	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

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Income Taxes - Income Tax Provision (Benefit) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Current tax provision	$ 1.8	$ 3.6
Future tax deductions	2.4	4.4
Valuation allowance change	0.6	0.5
Income tax provision	$ 4.8	$ 8.5

XML

Segment Information - Identifiable Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Identifiable Assets [Line Items]
Identifiable assets	$ 6,602.5	$ 6,688.9
Excess and Surplus Lines [Member]
Identifiable Assets [Line Items]
Identifiable assets	2,227.1	2,206.7
Commercial Specialty [Member]
Identifiable Assets [Line Items]
Identifiable assets	1,307.2	1,337.7
International Specialty [Member]
Identifiable Assets [Line Items]
Identifiable assets	753.2	731.8
Syndicate 1200 [Member]
Identifiable Assets [Line Items]
Identifiable assets	1,670.4	1,811.4
Run-Off Lines [Member]
Identifiable Assets [Line Items]
Identifiable assets	565.6	516.5
Corporate and Other [Member]
Identifiable Assets [Line Items]
Identifiable assets	$ 79.0	$ 84.8

XML

Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Available-for-sale (cost: 2013 - $2,839.9; 2012 - $2,993.1)	$ 2,972.6	$ 3,154.0
Equity securities, at fair value (cost: 2013 - $415.3; 2012 - $383.5)	609.2	531.4
Other investments (cost: 2013 - $315.3; 2012 - $284.8)	317.4	281.0
Short-term investments, at fair value (cost: 2013 - 234.2; 2012 - $234.3)	234.0	234.3
Total investments	4,133.2	4,200.7
Cash	91.2	95.8
Accrued investment income	26.9	30.3
Premiums receivable	365.6	361.0
Reinsurance recoverables	1,240.8	1,320.9
Goodwill	153.8	153.8
Intangible assets, net of accumulated amortization	90.0	91.5
Current income taxes receivable, net	13.6	12.9
Deferred acquisition costs, net	100.6	99.4
Ceded unearned premiums	230.9	193.6
Other assets	155.9	129.0
Total assets	6,602.5	6,688.9
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	3,205.0	3,223.5
Unearned premiums	737.3	730.2
Accrued underwriting expenses	115.8	105.0
Ceded reinsurance payable, net	475.4	612.1
Funds held	37.2	33.7
Senior unsecured fixed rate notes	143.8	143.8
Other indebtedness	64.4	63.8
Junior subordinated debentures	193.3	193.3
Deferred tax liabilities, net	57.3	43.8
Other liabilities	26.4	25.6
Total liabilities	5,055.9	5,174.8
Shareholders' equity:
Common shares - $1.00 par, 500,000,000 shares authorized; 31,463,460 and 31,384,271 shares issued at March 31, 2013 and December 31, 2012, respectively	31.5	31.4
Additional paid-in capital	725.5	722.7
Treasury shares (6,785,438 and 6,459,613 shares at March 31, 2013 and December 31, 2012, respectively)	(217.8)	(205.5)
Retained earnings	804.9	776.0
Accumulated other comprehensive income, net of taxes	202.5	189.5
Total shareholders' equity	1,546.6	1,514.1
Total liabilities and shareholders' equity	$ 6,602.5	$ 6,688.9

XML

Investments - Schedule of Reconciliation of Beginning and Ending Balances for Investments Categorized as Level 3 (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 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	0
Purchases	0	0
Issuances	0	0
Sales	(3.3)	(3.5)
Settlements	0	0
Ending balance	5.4	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	0
Purchases	0	0
Issuances	0	0
Sales	0	(0.6)
Settlements	0	0
Ending balance	1.8	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	(3.3)	(2.1)
Settlements	0	0
Ending balance	3.6	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 Statements of Cash Flow (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 32.7	$ 19.6
Adjustments to reconcile net income to net cash used by operating activities:
Amortization and depreciation	9.7	8.4
Share-based payments expense	8.6	2.6
Excess tax expense from share-based payment arrangements	0	0
Deferred income tax provision, net	3.0	4.9
Net realized investment gains	(9.5)	(13.1)
Change in:
Accrued investment income	3.4	2.0
Receivables	77.1	136.3
Deferred acquisition costs	(0.4)	(0.6)
Ceded unearned premiums	(37.3)	(39.6)
Reserves for losses and loss adjustment expenses	(17.8)	(36.9)
Unearned premiums	7.1	3.8
Ceded reinsurance payable and funds held	(133.2)	(90.2)
Income taxes	(0.7)	(5.0)
Accrued underwriting expenses	2.2	3.2
Other, net	(28.9)	(1.4)
Cash used by operating activities	(84.0)	(6.0)
Cash flows from investing activities:
Sales of fixed maturity investments	425.3	400.7
Maturities and mandatory calls of fixed maturity investments	115.1	106.5
Sales of equity securities	5.6	1.8
Sales of other investments	5.3	2.3
Purchases of fixed maturity investments	(378.0)	(445.5)
Purchases of equity securities	(38.3)	(55.2)
Purchases of other investments	(26.5)	(7.7)
Change in foreign regulatory deposits and voluntary pools	(1.2)	1.3
Change in short-term investments	(5.2)	16.4
Settlements of foreign currency exchange forward contracts	(1.9)	(0.6)
Purchases of fixed assets	(4.2)	(9.2)
Other, net	(1.3)	(4.3)
Cash provided (used) by investing activities	94.7	6.5
Cash flows from financing activities:
Activity under stock incentive plans	1.3	0
Repurchase of Company's common shares	(12.9)	(9.3)
Excess tax expense from share-based payment arrangements	0	0
Payment of cash dividend to common shareholders	(3.7)	(3.1)
Cash used by financing activities	(15.3)	(12.4)
Effect of exchange rate changes on cash	0	0.3
Change in cash	(4.6)	(11.6)
Cash, beginning of period	95.8	102.7
Cash, end of period	$ 91.2	$ 91.1

XML

Share-based Compensation - Fair Value Assumptions (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free rate of return	0.80%	1.09%
Expected dividend yields	1.64%	1.67%
Expected award life (years)	5 years 26 days	5 years 11 days
Expected volatility	31.90%	32.60%

XML

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

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Condensed Consolidating Balance Sheet

CONDENSED CONSOLIDATING BALANCE SHEET

March 31, 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	$	2.6	$	2,799.3	$	1,331.3		$	0.0		$	4,133.2
Cash		0.0		78.9		12.3			0.0			91.2
Premiums receivable		0.0		143.5		222.1			0.0			365.6
Reinsurance recoverables		0.0		1,159.6		81.2			0.0			1,240.8
Goodwill and other intangible assets		0.0		138.8		105.0			0.0			243.8
Current income taxes receivable, net		0.0		9.6		4.0			0.0			13.6
Deferred acquisition costs, net		0.0		52.1		48.5			0.0			100.6
Ceded unearned premiums		0.0		87.8		143.1			0.0			230.9
Other assets		7.3		111.6		63.9			0.0			182.8
Due from affiliates		0.0		9.7		(9.7	)		0.0			0.0
Intercompany note receivable		0.0		130.4		(130.4	)		0.0			0.0
Investments in subsidiaries		1,661.8		0.0		0.0			(1,661.8	)		0.0
Total assets	$	1,671.7	$	4,721.3	$	1,871.3		$	(1,661.8	)	$	6,602.5
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0	$	2,205.1	$	999.9		$	0.0		$	3,205.0
Unearned premiums		0.0		410.5		326.8			0.0			737.3
Funds held and ceded reinsurance payable, net		0.0		622.1		(109.5	)		0.0			512.6
Long-term debt		49.0		288.9		63.6			0.0			401.5
Current income taxes payable, net		0.0		0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0		49.3		8.0			0.0			57.3
Accrued underwriting expenses and other liabilities		12.8		80.5		48.9			0.0			142.2
Due to affiliates		3.2		0.0		0.0			(3.2	)		0.0
Intercompany note payable		60.1		0.0		0.0			(60.1	)		0.0
Total liabilities		125.1		3,656.4		1,337.7			(63.3	)		5,055.9
Total shareholders’ equity		1,546.6		1,064.9		533.6			(1,598.5	)		1,546.6
Total liabilities and shareholders’ equity	$	1,671.7	$	4,721.3	$	1,871.3		$	(1,661.8	)	$	6,602.5

⁽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 MARCH 31, 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		$	107.7		$	196.5		$	0.0		$	304.2
Net investment income		0.0			20.9			7.3			(0.3	)		27.9
Fee income, net		0.0			(0.3	)		0.3			0.0			0.0
Net realized investment gains		0.0			7.6			1.9			0.0			9.5
Total revenue		0.0			135.9			206.0			(0.3	)		341.6
Expenses:
Losses and loss adjustment expenses		0.0			64.3			106.2			0.0			170.5
Other reinsurance-related expenses		0.0			1.5			3.6			0.0			5.1
Underwriting, acquisition and insurance expenses		6.2			48.7			71.8			0.0			126.7
Interest expense		0.8			3.7			0.7			(0.3	)		4.9
Foreign currency exchange (gain) loss		(0.1	)		0.2			(3.2	)		0.0			(3.1	)
Total expenses		6.9			118.4			179.1			(0.3	)		304.1
(Loss) income before income taxes		(6.9	)		17.5			26.9			0.0			37.5
Provision for income taxes		0.0			3.2			1.6			0.0			4.8
Net (loss) income before equity in earnings of subsidiaries		(6.9	)		14.3			25.3			0.0			32.7
Equity in undistributed earnings of subsidiaries		39.6			0.0			0.0			(39.6	)		0.0
Net income	$	32.7		$	14.3		$	25.3		$	(39.6	)	$	32.7

⁽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 MARCH 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
Premiums and other revenue:
Earned premiums	$	0.0		$	108.9		$	168.4	$	0.0		$	277.3
Net investment income		0.0			21.9			9.5		0.0			31.4
Fee income, net		0.0			0.2			1.1		0.0			1.3
Net realized investment gains		0.0			9.6			3.5		0.0			13.1
Total revenue		0.0			140.6			182.5		0.0			323.1
Expenses:
Losses and loss adjustment expenses		0.0			68.5			97.3		0.0			165.8
Other reinsurance-related expenses		0.0			0.0			6.9		0.0			6.9
Underwriting, acquisition and insurance expenses		7.0			43.2			63.5		0.0			113.7
Interest expense		0.9			3.8			1.0		0.0			5.7
Foreign currency exchange (gain) loss		0.0			(0.1	)		3.0		0.0			2.9
Total expenses		7.9			115.4			171.7		0.0			295.0
Income (loss) before income taxes		(7.9	)		25.2			10.8		0.0			28.1
Provision for income taxes		0.0			7.0			1.5		0.0			8.5
Net income (loss) before equity in losses of subsidiaries		(7.9	)		18.2			9.3		0.0			19.6
Equity in undistributed losses of subsidiaries		27.5			0.0			0.0		(27.5	)		0.0
Net income	$	19.6		$	18.2		$	9.3	$	(27.5	)	$	19.6

⁽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 THREE MONTHS ENDED MARCH 31, 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	$	(0.5	)	$	2.7		$	(86.2	)	$	0.0		$	(84.0	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			199.0			237.2			0.0			436.2
Proceeds from maturities and mandatory calls of investments		0.0			86.7			28.4			0.0			115.1
Purchases of investments		0.0			(282.9	)		(159.9	)		0.0			(442.8	)
Change in short-term investments and foreign regulatory deposits		(2.2	)		28.6			(32.8	)		0.0			(6.4	)
Settlements of foreign currency exchange forward contracts		0.2			0.0			(2.1	)		0.0			(1.9	)
Issuance of intercompany note, net		0.0			(10.0	)		5.1			4.9			0.0
Other, net		0.0			(6.2	)		0.7			0.0			(5.5	)
Cash provided (used) by investing activities		(2.0	)		15.2			76.6			4.9			94.7
Cash flows from financing activities:
Borrowings under intercompany note, net		4.9			0.0			0.0			(4.9	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		1.3			0.0			(1.3	)		0.0			0.0
Activity under stock incentive plans		0.0			0.0			1.3			0.0			1.3
Repurchase of Company’s common shares		0.0			(12.9	)		0.0			0.0			(12.9	)
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		(3.7	)		0.0			0.0			0.0			(3.7	)
Cash provided (used) by financing activities		2.5			(12.9	)		0.0			(4.9	)		(15.3	)
Effect of exchange rate changes on cash		0.0			0.0			0.0			0.0			0.0
Change in cash		0.0			5.0			(9.6	)		0.0			(4.6	)
Cash, beginning of period		0.0			73.9			21.9			0.0			95.8
Cash, end of period	$	0.0		$	78.9		$	12.3		$	0.0		$	91.2

⁽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 THREE MONTHS ENDED MARCH 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
Net cash flows from operating activities	$	(9.3	)	$	7.5		$	(4.2	)	$	0.0		$	(6.0	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			224.6			180.2			0.0			404.8
Proceeds from maturities and mandatory calls of investments		0.0			72.7			33.8			0.0			106.5
Purchases of investments		0.0			(321.3	)		(187.1	)		0.0			(508.4	)
Change in short-term investments and foreign regulatory deposits		(0.6	)		35.7			(17.4	)		0.0			17.7
Settlements of foreign currency exchange forward contracts		0.3			0.0			(0.9	)		0.0			(0.6	)
Issuance of intercompany note, net		0.0			(15.0	)		2.3			12.7			0.0
Other, net		0.0			(6.1	)		(7.4	)		0.0			(13.5	)
Cash provided (used) by investing activities		(0.3	)		(9.4	)		3.5			12.7			6.5
Cash flows from financing activities:
Borrowings under intercompany note, net		12.7			0.0			0.0			(12.7	)		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		0.0			0.0			0.0			0.0			0.0
Repurchase of Company’s common shares		0.0			(9.3	)		0.0			0.0			(9.3	)
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		(3.1	)		0.0			0.0			0.0			(3.1	)
Cash (used) provided by financing activities		9.6			(9.3	)		0.0			(12.7	)		(12.4	)
Effect of exchange rate changes on cash		0.0			0.0			0.3			0.0			0.3
Change in cash		(0.0	)		(11.2	)		(0.4	)		0.0			(11.6	)
Cash, beginning of period		0.0			85.1			17.6			0.0			102.7
Cash, end of period	$	(0.0	)	$	73.9		$	17.2		$	0.0		$	91.1

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

⁽²⁾ Includes all Argo Group parent company eliminations

XML

Reserves for Losses and Loss Adjustment Expenses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Paid loss recoverables excluded from reinsurance recoverables on unpaid losses and LAE	$ 139.5	$ 59.2
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	(4.5)	(3.3)
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	(5.2)	(9.3)
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		(1.9)
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		0.9
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		(1.2)
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	0.9	(0.2)
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	(2.2)	(0.4)
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	0.9	2.0
Commercial Multi Peril [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	3.3
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	1.0
Commutations [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	0.7
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	1.1	4.6
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	2.2	9.4
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	4.0
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	(5.9)	(6.8)
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		(4.5)
Crop Losses [Member] | Property And Casualty Insurance Reporting Unit [Member]
Schedule Of Reserves For Losses And Loss Adjustment Expenses [Line Items]
Liability for unpaid claims and claims adjustment expense, incurred claims, prior years	1.3
Casualty and Professional 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	$ 0.5

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Information Provided in Connection with Outstanding Debt of Subsidiaries

3 Months Ended

Mar. 31, 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 March 31, 2013 and December 31, 2012 and for the three months ended March 31, 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

March 31, 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	$	2.6	$	2,799.3	$	1,331.3		$	0.0		$	4,133.2
Cash		0.0		78.9		12.3			0.0			91.2
Premiums receivable		0.0		143.5		222.1			0.0			365.6
Reinsurance recoverables		0.0		1,159.6		81.2			0.0			1,240.8
Goodwill and other intangible assets		0.0		138.8		105.0			0.0			243.8
Current income taxes receivable, net		0.0		9.6		4.0			0.0			13.6
Deferred acquisition costs, net		0.0		52.1		48.5			0.0			100.6
Ceded unearned premiums		0.0		87.8		143.1			0.0			230.9
Other assets		7.3		111.6		63.9			0.0			182.8
Due from affiliates		0.0		9.7		(9.7	)		0.0			0.0
Intercompany note receivable		0.0		130.4		(130.4	)		0.0			0.0
Investments in subsidiaries		1,661.8		0.0		0.0			(1,661.8	)		0.0
Total assets	$	1,671.7	$	4,721.3	$	1,871.3		$	(1,661.8	)	$	6,602.5
Liabilities and Shareholders’ Equity
Reserves for losses and loss adjustment expenses	$	0.0	$	2,205.1	$	999.9		$	0.0		$	3,205.0
Unearned premiums		0.0		410.5		326.8			0.0			737.3
Funds held and ceded reinsurance payable, net		0.0		622.1		(109.5	)		0.0			512.6
Long-term debt		49.0		288.9		63.6			0.0			401.5
Current income taxes payable, net		0.0		0.0		0.0			0.0			0.0
Deferred tax liabilities, net		0.0		49.3		8.0			0.0			57.3
Accrued underwriting expenses and other liabilities		12.8		80.5		48.9			0.0			142.2
Due to affiliates		3.2		0.0		0.0			(3.2	)		0.0
Intercompany note payable		60.1		0.0		0.0			(60.1	)		0.0
Total liabilities		125.1		3,656.4		1,337.7			(63.3	)		5,055.9
Total shareholders’ equity		1,546.6		1,064.9		533.6			(1,598.5	)		1,546.6
Total liabilities and shareholders’ equity	$	1,671.7	$	4,721.3	$	1,871.3		$	(1,661.8	)	$	6,602.5

⁽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 MARCH 31, 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		$	107.7		$	196.5		$	0.0		$	304.2
Net investment income		0.0			20.9			7.3			(0.3	)		27.9
Fee income, net		0.0			(0.3	)		0.3			0.0			0.0
Net realized investment gains		0.0			7.6			1.9			0.0			9.5
Total revenue		0.0			135.9			206.0			(0.3	)		341.6
Expenses:
Losses and loss adjustment expenses		0.0			64.3			106.2			0.0			170.5
Other reinsurance-related expenses		0.0			1.5			3.6			0.0			5.1
Underwriting, acquisition and insurance expenses		6.2			48.7			71.8			0.0			126.7
Interest expense		0.8			3.7			0.7			(0.3	)		4.9
Foreign currency exchange (gain) loss		(0.1	)		0.2			(3.2	)		0.0			(3.1	)
Total expenses		6.9			118.4			179.1			(0.3	)		304.1
(Loss) income before income taxes		(6.9	)		17.5			26.9			0.0			37.5
Provision for income taxes		0.0			3.2			1.6			0.0			4.8
Net (loss) income before equity in earnings of subsidiaries		(6.9	)		14.3			25.3			0.0			32.7
Equity in undistributed earnings of subsidiaries		39.6			0.0			0.0			(39.6	)		0.0
Net income	$	32.7		$	14.3		$	25.3		$	(39.6	)	$	32.7

⁽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 MARCH 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
Premiums and other revenue:
Earned premiums	$	0.0		$	108.9		$	168.4	$	0.0		$	277.3
Net investment income		0.0			21.9			9.5		0.0			31.4
Fee income, net		0.0			0.2			1.1		0.0			1.3
Net realized investment gains		0.0			9.6			3.5		0.0			13.1
Total revenue		0.0			140.6			182.5		0.0			323.1
Expenses:
Losses and loss adjustment expenses		0.0			68.5			97.3		0.0			165.8
Other reinsurance-related expenses		0.0			0.0			6.9		0.0			6.9
Underwriting, acquisition and insurance expenses		7.0			43.2			63.5		0.0			113.7
Interest expense		0.9			3.8			1.0		0.0			5.7
Foreign currency exchange (gain) loss		0.0			(0.1	)		3.0		0.0			2.9
Total expenses		7.9			115.4			171.7		0.0			295.0
Income (loss) before income taxes		(7.9	)		25.2			10.8		0.0			28.1
Provision for income taxes		0.0			7.0			1.5		0.0			8.5
Net income (loss) before equity in losses of subsidiaries		(7.9	)		18.2			9.3		0.0			19.6
Equity in undistributed losses of subsidiaries		27.5			0.0			0.0		(27.5	)		0.0
Net income	$	19.6		$	18.2		$	9.3	$	(27.5	)	$	19.6

⁽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 THREE MONTHS ENDED MARCH 31, 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	$	(0.5	)	$	2.7		$	(86.2	)	$	0.0		$	(84.0	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			199.0			237.2			0.0			436.2
Proceeds from maturities and mandatory calls of investments		0.0			86.7			28.4			0.0			115.1
Purchases of investments		0.0			(282.9	)		(159.9	)		0.0			(442.8	)
Change in short-term investments and foreign regulatory deposits		(2.2	)		28.6			(32.8	)		0.0			(6.4	)
Settlements of foreign currency exchange forward contracts		0.2			0.0			(2.1	)		0.0			(1.9	)
Issuance of intercompany note, net		0.0			(10.0	)		5.1			4.9			0.0
Other, net		0.0			(6.2	)		0.7			0.0			(5.5	)
Cash provided (used) by investing activities		(2.0	)		15.2			76.6			4.9			94.7
Cash flows from financing activities:
Borrowings under intercompany note, net		4.9			0.0			0.0			(4.9	)		0.0
Proceeds from issuance of senior unsecured fixed rate notes		1.3			0.0			(1.3	)		0.0			0.0
Activity under stock incentive plans		0.0			0.0			1.3			0.0			1.3
Repurchase of Company’s common shares		0.0			(12.9	)		0.0			0.0			(12.9	)
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		(3.7	)		0.0			0.0			0.0			(3.7	)
Cash provided (used) by financing activities		2.5			(12.9	)		0.0			(4.9	)		(15.3	)
Effect of exchange rate changes on cash		0.0			0.0			0.0			0.0			0.0
Change in cash		0.0			5.0			(9.6	)		0.0			(4.6	)
Cash, beginning of period		0.0			73.9			21.9			0.0			95.8
Cash, end of period	$	0.0		$	78.9		$	12.3		$	0.0		$	91.2

⁽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 THREE MONTHS ENDED MARCH 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
Net cash flows from operating activities	$	(9.3	)	$	7.5		$	(4.2	)	$	0.0		$	(6.0	)
Cash flows from investing activities:
Proceeds from sales of investments		0.0			224.6			180.2			0.0			404.8
Proceeds from maturities and mandatory calls of investments		0.0			72.7			33.8			0.0			106.5
Purchases of investments		0.0			(321.3	)		(187.1	)		0.0			(508.4	)
Change in short-term investments and foreign regulatory deposits		(0.6	)		35.7			(17.4	)		0.0			17.7
Settlements of foreign currency exchange forward contracts		0.3			0.0			(0.9	)		0.0			(0.6	)
Issuance of intercompany note, net		0.0			(15.0	)		2.3			12.7			0.0
Other, net		0.0			(6.1	)		(7.4	)		0.0			(13.5	)
Cash provided (used) by investing activities		(0.3	)		(9.4	)		3.5			12.7			6.5
Cash flows from financing activities:
Borrowings under intercompany note, net		12.7			0.0			0.0			(12.7	)		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		0.0			0.0			0.0			0.0			0.0
Repurchase of Company’s common shares		0.0			(9.3	)		0.0			0.0			(9.3	)
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		(3.1	)		0.0			0.0			0.0			(3.1	)
Cash (used) provided by financing activities		9.6			(9.3	)		0.0			(12.7	)		(12.4	)
Effect of exchange rate changes on cash		0.0			0.0			0.3			0.0			0.3
Change in cash		(0.0	)		(11.2	)		(0.4	)		0.0			(11.6	)
Cash, beginning of period		0.0			85.1			17.6			0.0			102.7
Cash, end of period	$	(0.0	)	$	73.9		$	17.2		$	0.0		$	91.1

⁽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)	3 Months Ended
	Mar. 31, 2013
Accounting Policies [Abstract]
Intangible assets more likely-than-not threshold	50.00%

XML

Investments (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2013 and December 31, 2012 were as follows:

March 31, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in millions)
Fixed maturities
USD denominated:
U.S. Governments	$	354.3	$	6.5	$	0.0	$	360.8
Non-U.S. Governments		54.5		1.8		0.6		55.7
Obligations of states and political subdivisions		614.7		43.9		1.0		657.6
Credit-Financial		356.5		23.8		0.5		379.8
Credit-Industrial		394.3		26.7		0.9		420.1
Credit-Utility		181.3		11.6		0.5		192.4
Structured securities:
CMO/MBS-agency (1)		331.8		17.6		0.4		349.0
CMO/MBS-non agency		11.3		1.2		0.0		12.5
CMBS (2)		113.1		4.7		0.2		117.6
ABS-residential (3)		9.1		0.3		0.7		8.7
ABS-non residential		92.1		1.2		0.0		93.3
Foreign denominated:
Governments		203.3		4.5		6.6		201.2
Credit		123.6		3.6		3.3		123.9
Total fixed maturities		2,839.9		147.4		14.7		2,972.6
Equity securities		415.3		197.4		3.5		609.2
Other investments		315.3		2.9		0.8		317.4
Short-term investments		234.2		0.0		0.2		234.0
Total investments	$	3,804.7	$	347.7	$	19.2	$	4,133.2
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 March 31, 2013, by contractual maturity, were as follows:

(in millions)	Amortized Cost		Fair Value
Due in one year or less	$	213.0	$	215.4
Due after one year through five years		1,117.7		1,150.6
Due after five years through ten years		714.3		776.4
Thereafter		237.5		249.1
Structured securities		557.4		581.1
Total	$	2,839.9	$	2,972.6

Schedule of Aging of Unrealized Losses on Investments

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

March 31, 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 (1)	$	15.6		$	0.0	$	0.0	$	0.0	$	15.6		$	0.0
Non-U.S. Governments (2)		20.0			0.6		0.2		0.0		20.2			0.6
Obligations of states and political subdivisions		55.7			0.9		0.8		0.1		56.5			1.0
Credit-Financial		24.1			0.1		1.7		0.4		25.8			0.5
Credit-Industrial		43.5			0.8		0.9		0.1		44.4			0.9
Credit-Utility		15.0			0.3		0.8		0.2		15.8			0.5
Structured securities:
CMO/MBS-agency (2)		25.0			0.4		1.0		0.0		26.0			0.4
CMBS		16.3			0.2		0.0		0.0		16.3			0.2
ABS-residential		0.0			0.0		4.7		0.7		4.7			0.7
ABS-non residential (1) (2)		23.2			0.0		0.2		0.0		23.4			0.0
Foreign denominated:
Governments		133.8			6.6		0.0		0.0		133.8			6.6
Credit		108.2			3.3		0.0		0.0		108.2			3.3
Total fixed maturities		480.4			13.2		10.3		1.5		490.7			14.7
Equity securities		40.9			3.5		0.0		0.0		40.9			3.5
Other investments		(0.8	)		0.8		0.0		0.0		(0.8	)		0.8
Short-term investments		0.0			0.2		0.0		0.0		0.0			0.2
Total	$	520.5		$	17.7	$	10.3	$	1.5	$	530.8		$	19.2

⁽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.

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 months ended March 31:

(in millions)	For the Three Months Ended March 31,
	2013			2012
Realized gains
Fixed maturities	$	11.5		$	8.3
Equity securities		0.5			0.0
Other investments		11.1			11.5
Short-term investments		0.1			0.2
Gross realized gains		23.2			20.0
Realized losses
Fixed maturities		(6.5	)		(2.9	)
Equity securities		0.0			(0.1	)
Other investments		(2.3	)		(3.8	)
Short-term investments		(0.1	)		0.0
Other-than-temporary impairment losses on equity securities		(1.4	)		(0.1	)
Other-than-temporary impairment losses on other investments		(3.4	)		0.0
Gross realized losses		(13.7	)		(6.9	)
Net realized investment gains	$	9.5		$	13.1

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

At March 31, 2013, our Corporate member’s capital supporting our Lloyd’s business consisted of:

Letters of credit	$	124.9
Fixed maturities, at fair value		165.5
Short-term investments, at fair value		3.4
Total securities and letters of credit pledged to Lloyd’s	$	293.8

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 March 31, 2013 and December 31, 2012 have been categorized as follows:

(in millions)	March 31, 2013		Fair Value Measurements at Reporting Date Using
			Level 1 (a)		Level 2 (b)		Level 3 (c)
Fixed maturities
USD denominated:
U.S. Governments	$	360.8	$	183.4	$	177.4	$	0.0
Non-U.S. Governments		55.7		0.0		55.7		0.0
Obligations of states and political subdivisions		657.6		0.0		657.6		0.0
Credit-Financial		379.8		0.0		379.8		0.0
Credit-Industrial		420.1		0.0		420.1		0.0
Credit-Utility		192.4		0.0		192.4		0.0
Structured securities:
CMO/MBS-agency		349.0		0.0		349.0		0.0
CMO/MBS-non agency		12.5		0.0		12.5		0.0
CMBS		117.6		0.0		117.6		0.0
ABS-residential		8.7		0.0		8.7		0.0
ABS-non residential		93.3		0.0		93.3		0.0
Foreign denominated:
Governments		201.2		0.0		201.2		0.0
Credit		123.9		0.0		123.9		0.0
Total fixed maturities		2,972.6		183.4		2,789.2		0.0
Equity securities		609.2		528.8		78.6		1.8
Other investments		139.2		0.0		139.2		0.0
Short-term investments		234.0		201.7		32.3		0.0
Other assets		3.6		0.0		0.0		3.6
	$	3,958.6	$	913.9	$	3,039.3	$	5.4

^(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 March 31, 2013 and December 31, 2012 are as follows:

(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		0.0		0.0			0.0
Purchases, issuances, sales, and settlements
Purchases		0.0		0.0			0.0
Issuances		0.0		0.0			0.0
Sales		0.0		(3.3	)		(3.3	)
Settlements		0.0		0.0			0.0
Ending balance, March 31, 2013	$	1.8	$	3.6		$	5.4
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 March 31, 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	)		(2.1	)		(3.5	)
Settlements		0.0			0.0			0.0			0.0
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

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Underwriting, Acquisition and Insurance Expenses - Underwriting, Acquisition and Insurance Expenses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Income And Expenses [Abstract]
Commissions	$ 51.9	$ 49.4
General expenses	68.7	60.5
Premium taxes, boards and bureaus	6.8	6.1
Underwriting Acquisition and Insurance Expenses, Total	127.4	116.0
Net (deferral) amortization of policy acquisition costs	(0.7)	(2.3)
Total underwriting, acquisition and insurance expenses	$ 126.7	$ 113.7

XML

Basis of Presentation

3 Months Ended

Mar. 31, 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 months ended, March 31, 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. Certain amounts applicable to prior periods have been reclassified to conform to the presentation followed as of March 31, 2013.

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Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Available-for-sale cost	$ 2,839.9	$ 2,993.1
Equity securities cost	415.3	383.5
Other investments cost	315.3	284.8
Short-term investments, Cost	$ 234.2	$ 234.3
Common shares, par value	$ 1.00	$ 1.00
Common shares, shares authorized	500,000,000	500,000,000
Common shares, shares issued	31,463,460	31,384,271
Treasury shares, shares	6,785,438	6,459,613

XML

Derivative Instruments

3 Months Ended

Mar. 31, 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 months ended March 31, 2013 and 2012 was $5.1 million and $6.9 million. 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 $3.6 million and $6.9 million, which represent the fair value of these contracts at March 31, 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.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2013	May 01, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
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		24,710,402

XML

Underwriting, Acquisition and Insurance Expenses

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Underwriting, Acquisition and Insurance Expenses

12. Underwriting, Acquisition and Insurance Expenses

Underwriting, acquisition and insurance expenses for the three months ended March 31, 2013 and 2012 were as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Commissions	$	51.9		$	49.4
General expenses		68.7			60.5
Premium taxes, boards and bureaus		6.8			6.1
		127.4			116.0
Net (deferral) amortization of policy acquisition costs		(0.7	)		(2.3	)
Total underwriting, acquisition and insurance expenses	$	126.7		$	113.7

Included in general expenses for the three months ended March 31, 2013 was $5.5 million in additional expense for our cash settled stock appreciation rights, due to the increase in our stock price.

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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
	Mar. 31, 2013	Mar. 31, 2012
Premiums and other revenue:
Earned premiums	$ 304.2	$ 277.3
Net investment income	27.9	31.4
Fee income, net	0	1.3
Net realized investment gains	9.5	13.1
Total revenue	341.6	323.1
Expenses:
Losses and loss adjustment expenses	170.5	165.8
Other reinsurance-related expenses	5.1	6.9
Underwriting, acquisition and insurance expenses	126.7	113.7
Interest expense	4.9	5.7
Foreign currency exchange (gains) loss	(3.1)	2.9
Total expenses	304.1	295.0
Income (loss) before income taxes	37.5	28.1
Provision for income taxes	4.8	8.5
Net income (loss) before equity in losses of subsidiaries	32.7	19.6
Equity in undistributed earnings (losses) of subsidiaries	0	0
Net income	32.7	19.6
Argo Group International Holdings, Ltd (Parent Guarantor) [Member]
Premiums and other revenue:
Earned premiums	0	0
Net investment income	0	0
Fee income, net	0	0
Net realized investment gains	0	0
Total revenue	0	0
Expenses:
Losses and loss adjustment expenses	0	0
Other reinsurance-related expenses	0	0
Underwriting, acquisition and insurance expenses	6.2	7.0
Interest expense	0.8	0.9
Foreign currency exchange (gains) loss	(0.1)	0
Total expenses	6.9	7.9
Income (loss) before income taxes	(6.9)	(7.9)
Provision for income taxes	0	0
Net income (loss) before equity in losses of subsidiaries	(6.9)	(7.9)
Equity in undistributed earnings (losses) of subsidiaries	39.6	27.5
Net income	32.7	19.6
Argo Group US, Inc. and Subsidiaries (Subsidiary Issuer) [Member]
Premiums and other revenue:
Earned premiums	107.7	108.9
Net investment income	20.9	21.9
Fee income, net	(0.3)	0.2
Net realized investment gains	7.6	9.6
Total revenue	135.9	140.6
Expenses:
Losses and loss adjustment expenses	64.3	68.5
Other reinsurance-related expenses	1.5	0
Underwriting, acquisition and insurance expenses	48.7	43.2
Interest expense	3.7	3.8
Foreign currency exchange (gains) loss	0.2	(0.1)
Total expenses	118.4	115.4
Income (loss) before income taxes	17.5	25.2
Provision for income taxes	3.2	7.0
Net income (loss) before equity in losses of subsidiaries	14.3	18.2
Equity in undistributed earnings (losses) of subsidiaries	0	0
Net income	14.3	18.2
Other Subsidiaries and Eliminations [Member]
Premiums and other revenue:
Earned premiums	196.5	168.4
Net investment income	7.3	9.5
Fee income, net	0.3	1.1
Net realized investment gains	1.9	3.5
Total revenue	206.0	182.5
Expenses:
Losses and loss adjustment expenses	106.2	97.3
Other reinsurance-related expenses	3.6	6.9
Underwriting, acquisition and insurance expenses	71.8	63.5
Interest expense	0.7	1.0
Foreign currency exchange (gains) loss	(3.2)	3.0
Total expenses	179.1	171.7
Income (loss) before income taxes	26.9	10.8
Provision for income taxes	1.6	1.5
Net income (loss) before equity in losses of subsidiaries	25.3	9.3
Equity in undistributed earnings (losses) of subsidiaries	0	0
Net income	25.3	9.3
Consolidating Adjustments [Member]
Premiums and other revenue:
Earned premiums	0	0
Net investment income	(0.3)	0
Fee income, net	0	0
Net realized investment gains	0	0
Total revenue	(0.3)	0
Expenses:
Losses and loss adjustment expenses	0	0
Other reinsurance-related expenses	0	0
Underwriting, acquisition and insurance expenses	0	0
Interest expense	(0.3)	0
Foreign currency exchange (gains) loss	0	0
Total expenses	(0.3)	0
Income (loss) before income taxes	0	0
Provision for income taxes	0	0
Net income (loss) before equity in losses of subsidiaries	0	0
Equity in undistributed earnings (losses) of subsidiaries	(39.6)	(27.5)
Net income	$ (39.6)	$ (27.5)

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Consolidated Statements of Income (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Premiums and other revenue:
Earned premiums	$ 304.2	$ 277.3
Net investment income	27.9	31.4
Fee income, net	0	1.3
Net realized investment gains	9.5	13.1
Total revenue	341.6	323.1
Expenses:
Losses and loss adjustment expenses	170.5	165.8
Other reinsurance-related expenses	5.1	6.9
Underwriting, acquisition and insurance expenses	126.7	113.7
Interest expense	4.9	5.7
Foreign currency exchange (gain) loss	(3.1)	2.9
Total expenses	304.1	295.0
Income before income taxes	37.5	28.1
Provision for income taxes	4.8	8.5
Net income	32.7	19.6
Net income per common share:
Basic	$ 1.32	$ 0.75
Diluted	$ 1.28	$ 0.74
Dividend declared per common share:	$ 0.15	$ 0.12
Weighted average common shares:
Basic	24,768,904	26,177,410
Diluted	25,596,237	26,482,309
Net Realized investment gains before other-than-temporary impairment losses	14.3	13.2
Other-than-temporary impairment losses recognized in earnings
Other-than-temporary impairment losses on equity securities	(1.4)	(0.1)
Other-than-temporary impairment losses on other investments	(3.4)	0
Impairment losses recognized in earnings	(4.8)	(0.1)
Net realized investment gains	$ 9.5	$ 13.1

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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 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 months ended March 31, 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			13.8			0.0			13.8
Amounts reclassified from accumulated other comprehensive income		0.0			(0.8	)		0.0			(0.8	)
Net current-period other comprehensive income		0.0			13.0			0.0			13.0
Ending balance, March 31, 2013	$	(8.7	)	$	217.1		$	(5.9	)	$	202.5

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 March 31, 2013
Unrealized gains and losses on securities
Net realized investment gains	$	(0.7	)
Provision for income taxes		(0.1	)
Net of taxes	$	(0.8	)

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Net Income Per Common Share

3 Months Ended

Mar. 31, 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 months ended March 31, 2013 and 2012:

	For the Three Months Ended March 31,
(in millions, except number of shares and per share amounts)	2013		2012
Net income	$	32.7	$	19.6
Weighted average common shares outstanding - basic		24,768,904		26,177,410
Effect of dilutive securities
Equity compensation awards		827,333		304,899
Weighted average common shares outstanding - diluted		25,596,237		26,482,309
Net income per common share - basic	$	1.32	$	0.75
Net income per common share - diluted	$	1.28	$	0.74

Excluded from the weighted average common shares outstanding calculation at March 31, 2013 and 2012 are 6,785,438 shares and 5,310,181 shares, respectively, which are held as treasury shares. The shares are excluded as of their repurchase date. For the three months ended March 31, 2013, equity compensation awards to purchase 214,453 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 2015. For the three months ended March 31, 2012, equity compensation awards to purchase 1,200,366 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 2012 through 2018.

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Recently Issued Accounting Standards (Policies)

3 Months Ended

Mar. 31, 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 is 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 is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. Early adoption is 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. We do not anticipate that this update will have an impact on our financial results and disclosures.

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 are 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.

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Segment Information

3 Months Ended

Mar. 31, 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 months ended March 31, 2013 and 2012 were as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Revenue:
Earned premiums
Excess and Surplus Lines	$	105.1		$	96.2
Commercial Specialty		75.2			82.0
International Specialty		32.7			28.0
Syndicate 1200		90.9			71.1
Run-off Lines		0.3			0.0
Total earned premiums		304.2			277.3
Net investment income
Excess and Surplus Lines		10.9			13.0
Commercial Specialty		5.9			6.9
International Specialty		2.3			4.1
Syndicate 1200		2.8			3.9
Run-off Lines		2.8			3.5
Corporate and Other		3.2			0.0
Total net investment income		27.9			31.4
Fee income, net		0.0			1.3
Net realized investment gains		9.5			13.1
Total revenue	$	341.6		$	323.1
	For the Three Months Ended March 31,
(in millions)	2013			2012
Income (loss) before income taxes
Excess and Surplus Lines	$	13.9		$	18.9
Commercial Specialty		5.7			(0.3	)
International Specialty		4.8			5.8
Syndicate 1200		8.4			1.7
Run-off Lines		(0.4	)		(0.4	)
Total segment income (loss) before taxes		32.4			25.7
Corporate and Other		(4.4	)		(10.7	)
Net realized investment and other gains		9.5			13.1
Total income (loss) before income taxes	$	37.5		$	28.1

The table below presents earned premiums by geographic location for the three months ended March 31, 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 March 31,
(in millions)	2013		2012
Bermuda	$	25.8	$	22.3
Brazil		10.0		6.5
Malta		0.4		0.0
United Kingdom		87.0		70.3
United States		181.0		178.2
Total earned premiums	$	304.2	$	277.3

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

(in millions)	March 31, 2013		December 31, 2012
Excess and Surplus Lines	$	2,227.1	$	2,206.7
Commercial Specialty		1,307.2		1,337.7
International Specialty		753.2		731.8
Syndicate 1200		1,670.4		1,811.4
Run-off Lines		565.6		516.5
Corporate and Other		79.0		84.8
Total	$	6,602.5	$	6,688.9

Included in total assets at March 31, 2013 and December 31, 2012 are $355.8 million and $505.7 million, respectively, in assets associated with trade capital providers.

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Share-based Compensation

3 Months Ended

Mar. 31, 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 three months ended March 31, 2013 and 2012:

	2013			2012
Risk-free rate of return		0.80	%		1.09	%
Expected dividend yields		1.64	%		1.67	%
Expected award life (years)		5.07			5.03
Expected volatility		31.9	%		32.6	%

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. We are prohibited from repricing the options. 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 March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		388,187		$	36.90
Granted		0		$	0.00
Exercised		(35,239	)	$	35.45
Expired or forfeited		(42,670	)	$	37.77
Outstanding at March 31, 2013		310,278		$	36.95

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 $0.3 million for the three months ended March 31, 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 March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Outstanding at January 1, 2013		236,139		$	29.76
Granted		67,100		$	38.42
Vested and issued		(50,499	)	$	30.40
Expired or forfeited		(5,244	)	$	29.65
Outstanding at March 31, 2013		247,496		$	32.30

The restricted shares will vest over two to four years. Expense recognized under this plan for the restricted shares was $1.0 million and $0.2 million for the three months ended March 31, 2013 and 2012, respectively. As of March 31, 2013, there was $5.1 million of total unrecognized compensation cost related to restricted shares.

A summary of stock-settled SARs activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,154,087		$	29.74
Granted		271,777		$	40.08
Exercised		(30,706	)	$	29.10
Expired or forfeited		(46,793	)	$	30.58
Outstanding at March 31, 2013		1,348,365		$	31.81

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 $0.7 million for each of the three months ended March 31, 2013 and 2012. As of March 31, 2013, there was $3.3 million of total unrecognized compensation cost related to stock-settled SARs.

A summary of cash-settled SARs activity under the 2007 Plan as of March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		1,745,614		$	29.95
Granted		481,393		$	40.08
Exercised		(156,031	)	$	29.15
Expired or forfeited		(112,882	)	$	29.60
Outstanding at March 31, 2013		1,958,094		$	32.53

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 $6.5 million and $1.0 million for the three months ended March 31, 2013 and 2012, respectively. As of March 31, 2013, there was $6.4 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 $0.6 million and $0.3 million for the three months ended March 31, 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 March 31, 2013, and changes during the three months then ended is as follows:

	Shares			Weighted-Average Exercise Price
Outstanding at January 1, 2013		201,505		$	38.00
Granted		0		$	0.00
Exercised		(76,772	)	$	34.16
Expired or forfeited		0		$	0.00
Outstanding at March 31, 2013		124,733		$	40.37

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

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Share-based Compensation - Summary of Option Activity (Detail) (2007 Plan [Member], USD $)	3 Months Ended
	Mar. 31, 2013
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	388,187
Granted, Shares	0
Exercised, shares	(35,239)
Expired or forfeited, Shares	(42,670)
Shares, Outstanding at March 31, 2013	310,278
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 36.90
Granted, Weighted-Average Exercise Price	$ 0.00
Exercised, Weighted-Average Exercise Price	$ 35.45
Expired or forfeited, Weighted-Average Exercise Price	$ 37.77
Weighted-Average Exercise Price, Outstanding at March 31, 2013	$ 36.95

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Commitments and Contingencies

3 Months Ended

Mar. 31, 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.

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Income Taxes

3 Months Ended

Mar. 31, 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 March 31,
(in millions)	2013		2012
Current tax provision	$	1.8	$	3.6
Deferred tax provision related to:
Future tax deductions		2.4		4.4
Valuation allowance change		0.6		0.5
Income tax provision	$	4.8	$	8.5

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 months ended March 31, 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 March 31,
(in millions)	2013						2012
	Pre-tax income (loss)			Effective Tax Rate			Pre-tax income (loss)			Effective Tax Rate
Bermuda	$	16.1			0.0	%	$	0.3			0.0	%
United States		17.5			18.3	%		25.4			27.9	%
United Kingdom		6.0			25.5	%		4.7			31.0	%
Belgium		0.0	(1)		-67.6	%		0.1			27.8	%
Brazil		(1.8	)		0.0	%		(1.6	)		1.2	%
Dubai		0.0			0.0	%		0.0	(1)		0.0	%
Ireland		0.0			0.0	%		(0.1	)		0.0	%
Malta		(0.3	)		0.0	%		(0.7	)		0.0	%
Switzerland		0.0	(1)		24.5	%		0.0	(1)		24.4	%
Pre-tax income (loss)	$	37.5					$	28.1

(1) 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 months ended March 31, 2013 and 2012 is as follows:

	For the Three Months Ended March 31,
(in millions)	2013			2012
Income tax provision at expected rate	$	6.7		$	9.3
Tax effect of:
Tax-exempt interest		(1.4	)		(1.4	)
Dividends received deduction		(0.6	)		(0.4	)
Valuation allowance change		0.6			0.5
Other permanent adjustments, net		(0.9	)		0.5
Adjustment for annualized rate		0.4			(0.2	)
United States state tax benefit		(0.2	)		(0.1	)
Foreign exchange adjustments		0.2			0.3
Income tax provision	$	4.8		$	8.5
Income tax provision - Foreign	$	1.6		$	1.4
Income tax provision - United States Federal		3.5			7.2
Income tax benefit - United States State		(0.3	)		(0.1	)
Income tax provision	$	4.8		$	8.5

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 March 31, 2013, we had a total net deferred tax liability of $4.2 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 $30.5 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 $53.1 million is required as of March 31, 2013. The loss carryforwards available per year are $2.8 million as required by Internal Revenue Code Section 382. For the three months ended March 31, 2013, the valuation allowance was reduced by $0.2 million pertaining to the use of the PXRE and ARIS loss carryforwards, was increased by $0.1 million pertaining to the Malta operations and was increased by $0.7 million pertaining to the Brazil operations.

We had no material unrecognized tax benefits as of March 31, 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.

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Reserves for Losses and Loss Adjustment Expenses

3 Months Ended

Mar. 31, 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 $139.5 million and $59.2 million as of March 31, 2013 and 2012, respectively:

	For the Three Months Ended March 31,
(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 calendar year, net of reinsurance:
Current accident year		175.0			169.1
Prior accident years		(4.5	)		(3.3	)
Losses and LAE incurred during calendar year, net of reinsurance		170.5			165.8
Deduct:
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year		21.9			22.6
Prior accident years		159.7			153.1
Losses and LAE payments made during current calendar year, net of reinsurance:		181.6			175.7
Change in participation interest (2)		10.4			(3.1	)
Foreign exchange adjustments		(6.5	)		0.9
Net reserves - end of period		2,103.7			2,337.6
Add:
Reinsurance recoverables on unpaid losses and LAE, end of period		1,101.3			929.6
Gross reserves - end of period	$	3,205.0		$	3,267.2

(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 three months ended March 31, 2013 was $4.5 million in favorable prior years’ loss reserve development comprised of the following: $5.2 million net favorable development in the Excess and Surplus Lines segment primarily caused by favorable development of $5.9 million in the general and products liability lines and $3.3 million in commercial multi-peril liability, partially offset with $4.0 million of unfavorable development in commercial automobile; $1.1 million of net unfavorable development in the Commercial Specialty segment, primarily driven by $2.2 million unfavorable development in general liability due to increases in claim severity offset by $1.0 million favorable development in the surety line of business at Rockwood; $0.9 million net unfavorable development in the International Specialty segment driven by $1.3 million of unfavorable development for the property catastrophe reinsurance unit, primarily due to crop losses, partially offset by $0.5 million of favorable casualty losses for professional lines; $2.2 million net favorable development in the Syndicate 1200 segment driven by favorable development in property facultative and North American binder business; $0.9 million unfavorable development in the Runoff Lines segment primarily caused by $0.7 million unfavorable development related to commutations.

Included in losses and LAE for the three months ended March 31, 2012 was $3.3 million in favorable prior years’ loss reserve development comprised of the following: $9.3 million of favorable development in the Excess and Surplus Lines segment primarily driven by $6.8 million of favorable development in the general and products liability lines of business primarily in accident year 2009 and $1.9 million of favorable development in the automobile liability lines of business; $4.6 million of net unfavorable development in the Commercial Specialty segment driven by $9.4 million of unfavorable development in general liability due to increases in claim severity, $0.9 million of unfavorable development in the automobile liability lines of business, partially offset by $4.5 million of favorable development in workers compensation and $1.2 million of favorable development in short-tail lines; $0.2 million of net favorable development in the International Specialty segment primarily within the long-tail professional liability lines; $0.4 million of net favorable development in the Syndicate 1200 segment 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 and favorable development in the Directors and Officers class due to one specific claim, partially offset by unfavorable development in the International property treaty class of business due to deterioration in one cedent relating to the 2011 Japan earthquake, and unfavorable development in the non-catastrophe professional indemnity, general liability and binder classes of business due to poorer than expected claims experience; and $2.0 million of unfavorable development in the Run-off Lines segment primarily related to risk management run-off reserves due to strengthening the reserve for unallocated loss adjustment expenses.

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.

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Share-based Compensation - Summary of Non-Vested Shares Activity Under Amended Plan (Detail) (Amended Plan [Member], USD $)	3 Months Ended
	Mar. 31, 2013
Amended Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	201,505
Granted, Shares	0
Exercised, shares	(76,772)
Expired or forfeited, Shares	0
Shares, Outstanding at March 31, 2013	124,733
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 38.00
Granted, Weighted-Average Exercise Price	$ 0.00
Exercised, Weighted-Average Exercise Price	$ 34.16
Expired or forfeited, Weighted-Average Exercise Price	$ 0.00
Weighted-Average Exercise Price, Outstanding at March 31, 2013	$ 40.37

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Reserves for Losses and Loss Adjustment Expenses - Reinsurance Recoverables (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 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	175.0	169.1
Prior accident years	(4.5)	(3.3)
Losses and LAE incurred during calendar year, net of reinsurance	170.5	165.8
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year	21.9	22.6
Prior accident years	159.7	153.1
Losses and LAE payments made during current calendar year, net of reinsurance:	181.6	175.7
Change in participation interest	10.4	(3.1)
Foreign exchange adjustments	(6.5)	0.9
Net reserves - end of period	2,103.7	2,337.6
Reinsurance recoverables on unpaid losses and LAE, end of period	1,101.3	929.6
Gross reserves - end of period	$ 3,205.0	$ 3,267.2

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Share-based Compensation - Summary of Option Activity Under Amended Plan (Detail) (Cash-Settled SARs Activity [Member], USD $)	3 Months Ended
	Mar. 31, 2013
Cash-Settled SARs Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Outstanding at January 1, 2013	1,745,614
Granted, Shares	481,393
Exercised, shares	(156,031)
Expired or forfeited, Shares	(112,882)
Shares, Outstanding at March 31, 2013	1,958,094
Weighted-Average Exercise Price, Outstanding at January 1, 2013	$ 29.95
Granted, Weighted-Average Exercise Price	$ 40.08
Exercised, Weighted-Average Exercise Price	$ 29.15
Expired or forfeited, Weighted-Average Exercise Price	$ 29.60
Weighted-Average Exercise Price, Outstanding at March 31, 2013	$ 32.53

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Disclosures about Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2013 and December 31, 2012 is shown below:

	March 31, 2013				December 31, 2012
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Junior subordinated debentures	$	193.3	$	156.6	$	193.3	$	151.8
Senior unsecured fixed rate notes		143.8		143.2		143.8		143.2
Other indebtedness:
Floating rate loan stock		63.6		51.5		63.0		49.5
Note payable		0.8		0.6		0.8		0.6
	$	401.5	$	351.9	$	400.9	$	345.1

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Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 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	0
Net current-period other comprehensive income, Foreign currency translation adjustments	0
Ending balance, Foreign currency translation adjustments	(8.7)
Beginning balance, Unrealized holding gains on securities	204.1
Other comprehensive income before reclassifications, Unrealized holding gains on securities	13.8
Amounts reclassified from accumulated other comprehensive income, Unrealized holding gains on securities	(0.8)
Net current-period other comprehensive income, Unrealized holding gains on securities	13.0
Ending balance, Unrealized holding gains on securities	217.1
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)
Beginning balance	189.5
Other comprehensive income before reclassifications	13.8
Amounts reclassified from accumulated other comprehensive income	(0.8)
Other comprehensive income, net of tax	13.0	35.5
Ending balance	$ 202.5

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Disclosures about Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 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 March 31, 2013 and December 31, 2012, the carrying values of premiums receivable over 90 days were $25.3 million and $24.3 million, respectively. Included in “Reinsurance recoverables” in the Consolidated Balance Sheets at March 31, 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 March 31, 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 March 31, 2013 and December 31, 2012, the carrying values over 90 days were $16.2 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 collectibility was deemed questionable, have been included in the allowances. At March 31, 2013 and December 31, 2012, the allowance for doubtful accounts for premiums receivable was $3.1 million and $2.5 million, respectively. The allowance for doubtful accounts for reinsurance recoverables on paid losses was $2.2 million at both March 31, 2013 and December 31, 2012. Premiums receivable over 90 days were secured by collateral in the amount of $0.7 million and $0.4 million at March 31, 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 March 31, 2013 and December 31, 2012.

At March 31, 2013 and December 31, 2012 the fair value of our Junior Subordinated Debentures, Senior unsecured fixed rate notes, and other indebtedness was estimated using 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 March 31, 2013 and December 31, 2012 is shown below:

	March 31, 2013				December 31, 2012
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Junior subordinated debentures	$	193.3	$	156.6	$	193.3	$	151.8
Senior unsecured fixed rate notes		143.8		143.2		143.8		143.2
Other indebtedness:
Floating rate loan stock		63.6		51.5		63.0		49.5
Note payable		0.8		0.6		0.8		0.6
	$	401.5	$	351.9	$	400.9	$	345.1

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Net Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2013 and 2012:

	For the Three Months Ended March 31,
(in millions, except number of shares and per share amounts)	2013		2012
Net income	$	32.7	$	19.6
Weighted average common shares outstanding - basic		24,768,904		26,177,410
Effect of dilutive securities
Equity compensation awards		827,333		304,899
Weighted average common shares outstanding - diluted		25,596,237		26,482,309
Net income per common share - basic	$	1.32	$	0.75
Net income per common share - diluted	$	1.28	$	0.74

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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
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 32.7	$ 19.6
Weighted average common shares outstanding - basic	24,768,904	26,177,410
Equity compensation awards	827,333	304,899
Weighted average common shares outstanding - diluted	25,596,237	26,482,309
Net income per common share - basic	$ 1.32	$ 0.75
Net income per common share - diluted	$ 1.28	$ 0.74

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

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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 32.7	$ 19.6
Other comprehensive income:
Foreign currency translation adjustments	0	1.1
Unrealized gains on securities:
Gains arising during the period	24.2	52.4
Reclassification adjustment for gains included in net income	(0.7)	(5.4)
Other comprehensive income before tax	23.5	48.1
Unrealized gains on securities:
Gains arising during the period	10.4	14.2
Reclassification adjustment for gains included in net income	0.1	(1.6)
Income tax provision related to other comprehensive income	10.5	12.6
Other comprehensive income, net of tax	13.0	35.5
Comprehensive income	$ 45.7	$ 55.1

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Shareholders' Equity

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Shareholders' Equity

4. Shareholders’ Equity

On February 15, 2013 and February 15, 2012, our Board of Directors declared a quarterly cash dividend in the amount of $0.15 and $0.12, respectively, on each share of common stock outstanding. On March 15, 2013 and 2012, we paid $3.7 million and $3.1 million, respectively, to our shareholders of record on March 1, 2013 and 2012, respectively.

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 May 1, 2013, we have repurchased 6,934,145 shares of our common stock at an average price of $32.28 for a total cost of $223.7 million. These shares are being held as treasury shares in accordance with the provisions of the Bermuda Companies Act 1981. As of May 1, 2013, availability under the 2011 Repurchase Authorization for future repurchases of our common shares was $52.6 million.

For the three months ended March 31, 2013, we repurchased a total of 325,825 common shares for $12.3 million. A summary of activity from January 1, 2013 through May 3, 2013 follows.

For the three months ended March 31, 2013, we repurchased 97,600 common shares on the open market for $3.9 million. 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

⁽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.

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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Nov. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
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, distributions period, months	6 months
Deferred compensation arrangement with individual, shares authorized for issuance	1,650
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of shares options, (in years)	seven years
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized			4,500,000
Share-based compensation arrangement by share-based payment award, compensation expense	$ 0.3
Deferred compensation arrangement with individual, interest rate		two percent above the prime rate
2007 Plan [Member] | Maximum [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
Share-based compensation arrangement by share-based payment award, discount from market price		100.00%
2007 Plan [Member] | Minimum [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	1 year
Share-based compensation arrangement by share-based payment award, discount from market price		50.00%
Cash-Settled SARs Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, unrecognized compensation costs on nonvested awards	6.4
Deferred compensation arrangement with individual, compensation expense	6.5	1.0
Cash-Settled SARs Activity [Member] | Maximum [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	4 years
Cash-Settled SARs Activity [Member] | Minimum [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	1 year
Amended Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized	6,250,000
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, compensation expense	1.0	0.2
Employee service share-based compensation, unrecognized compensation costs on nonvested awards	5.1
Restricted Share Units [Member] | Maximum [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	4 years
Restricted Share Units [Member] | Minimum [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	2 years
Stock-Settled SARs Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, compensation expense	7.0	7.0
Employee service share-based compensation, unrecognized compensation costs on nonvested awards	3.3
Stock-Settled SARs Activity [Member] | Maximum [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	4 years
Stock-Settled SARs Activity [Member] | Minimum [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	1 year
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement with individual, compensation expense	$ 0.6	0.3

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Underwriting, Acquisition and Insurance Expenses - Additional Information (Detail) (Cash-Settled SARs Activity [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Cash-Settled SARs Activity [Member]
Underwriting Acquisition and Insurance Expense [Line Items]
Expense associated with cash settled stock appreciation rights	$ 5.5

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Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 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			13.8			0.0			13.8
Amounts reclassified from accumulated other comprehensive income		0.0			(0.8	)		0.0			(0.8	)
Net current-period other comprehensive income		0.0			13.0			0.0			13.0
Ending balance, March 31, 2013	$	(8.7	)	$	217.1		$	(5.9	)	$	202.5

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 March 31, 2013
Unrealized gains and losses on securities
Net realized investment gains	$	(0.7	)
Provision for income taxes		(0.1	)
Net of taxes	$	(0.8	)

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Supplemental Cash Flow Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes Paid Net [Abstract]
Income taxes paid	$ 2.5	$ 8.1

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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Security D	Mar. 31, 2012	Dec. 31, 2012
Schedule of Investments [Line Items]
Fair value of investments, assets managed on behalf of the trade capital providers	$ 103.7		$ 143.9
Number of securities in an unrealized loss position, total	6,418
Number of securities in an unrealized loss position for less than one year	33
Number of securities in an unrealized loss position for a period of one year or greater	1,034
Other-than-temporary impairment losses on fixed maturities	0	0
Other-than-temporarily losses equity portfolio	1.4	0.1
Other-than-temporary impairment losses on other investments	3.4	0
Forward contracts, term, days	60
Foreign exchange unrealized gains on bonds		0.1
Foreign exchange realized losses on forwards		0.1
Total notional amount of the Company's holdings in non-U.S. Dollar denominated higher yielding fixed maturity investments	1.7	3.0
Notional amount of the currency forward contracts	73.7	132.8
Fair value of put option	0.6	1.4
Realized gains from currency forward contracts	1.6	3.2
Realized losses from currency forward contracts	2.3	3.3
Amortized Cost	3,804.7		3,895.7
Fair Value	4,133.2		4,200.7
Loss and loss expense reserve	64.8
Underwriting business at Lloyd's	124.9
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	1.5	2.8
Deposit with Various U.S. Insurance and Other Regulatory Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	212.8
Fair Value	228.8
Securities Pledged As Collateral [Member]
Schedule of Investments [Line Items]
Pledged assets separately reported, securities pledged under letters of credit facilities, at amortized cost	249.1
Pledged assets separately reported, securities pledged under letters of credit facilities, at fair value	$ 253.2

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Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2013

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

14. Supplemental Cash Flow Information

Income taxes paid. We paid income taxes of $2.5 million and $8.1 million during the three months ended March 31, 2013 and 2012, respectively.

Interest paid. Interest paid for the three months ended March 31, was as follows:

	For the Three Months Ended March 31,
(in millions)	2013		2012
Senior unsecured fixed rate notes	$	2.3	$	0.0
Other indebtedness		0.9		1.0
Junior subordinated debentures		1.9		6.9
Total interest paid	$	5.1	$	7.9