Unaudited Quarterly Financial Information

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Information

21. Unaudited Quarterly Financial Information

			2012												2011
(in millions of U.S. dollars,			Fourth			Third			Second			First			Fourth			Third			Second			First
except per share amounts)			Quarter			Quarter			Quarter			Quarter			Quarter			Quarter			Quarter			Quarter
Net premiums written		$		920.3	$		1,043.2	$		1,136.0	$		1,473.3	$		879.9	$		1,079.6	$		1,056.5	$		1,470.4
Net premiums earned				1,168.1			1,237.1			1,090.9			989.8			1,181.4			1,294.3			1,107.5			1,064.6
Net investment income				135.7			135.3			153.5			146.9			155.5			163.7			158.3			151.6
Net realized and unrealized
	investment gains (losses)			5.1			257.4			38.1			192.7			74.6			26.1			78.2			(112.2)
Other income				3.8			2.7			2.6			2.8			3.1			1.4			1.6			1.8
Total revenues				1,312.7			1,632.5			1,285.1			1,332.2			1,414.6			1,485.5			1,345.6			1,105.8
Losses and loss expenses
	and life policy benefits			800.9			721.1			706.1			576.5			1,069.2			881.7			814.5			1,607.2
Acquisition costs				245.5			247.1			232.7			211.6			238.8			262.5			229.2			207.9
Other operating expenses				112.3			94.7			106.2			98.2			113.0			103.8			113.7			104.3
Interest expense				12.2			12.2			12.2			12.2			12.3			12.2			12.2			12.3
Amortization of intangible assets				5.1			8.9			8.9			8.9			8.9			9.5			9.2			8.8
Net foreign exchange losses (gains)				3.4			2.0			(7.7)			2.6			(14.7)			(10.6)			(8.7)			(0.7)
Total expenses				1,179.4			1,086.0			1,058.4			910.0			1,427.5			1,259.1			1,170.1			1,939.8
Income (loss) before taxes and interest in
	earnings (losses) of equity investments			133.3			546.5			226.7			422.2			(12.9)			226.4			175.5			(834.0)
Income tax expense (benefit)				22.8			64.1			50.1			67.2			3.3			41.8			50.1			(26.3)
Interest in earnings (losses) of equity
	investments			1.0			4.3			(0.5)			5.1			(1.4)			(4.5)			(1.2)			0.7
Net income (loss)				111.5			486.7			176.1			360.1			(17.6)			180.1			124.2			(807.0)
Preferred dividends				15.4			15.4			15.4			15.4			15.4			14.4			8.6			8.6
Net income (loss) available to common
	shareholders	$		96.1	$		471.3	$		160.7	$		344.7	$		(33.0)	$		165.7	$		115.6	$		(815.6)
Basic net income (loss) per common share		$		1.58	$		7.62	$		2.52	$		5.27	$		(0.49)	$		2.45	$		1.71	$		(11.99)
Diluted net income (loss) per common share				1.56			7.53			2.50			5.24			(0.49)			2.43			1.69			(11.99)
Dividends declared per common share				0.62			0.62			0.62			0.62			0.60			0.60			0.60			0.55