CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Gross insurance and reinsurance premiums written	$ 242.7	$ 253.5	$ 503.9	$ 513.2
Ceded reinsurance premiums	(44.9)	(42.7)	(80.1)	(82.4)
Net insurance and reinsurance premiums written	197.8	210.8	423.8	430.8
Change in net unearned insurance and reinsurance premiums	(58.9)	(64.4)	(125.2)	(123.9)
Net insurance and reinsurance premiums earned	138.9	146.4	298.6	306.9
Net investment income	16.7	17.2	33.1	34.8
Net realized and unrealized investment gains (losses)	(61.2)	13.3	(61.9)	45.7
Net foreign currency gains (losses)	(5.3)	2.9	15.8	0.3
Net income (loss) from derivative instruments	(12.2)	2.1	(7.6)	3.6
Other revenue		0.2		0.7
Total revenues	76.9	182.1	278.0	392.0
Underwriting expenses:
Loss and loss adjustment expenses	46.8	57.2	97.4	101.2
Insurance and reinsurance acquisition costs	22.6	23.6	44.7	48.4
General and administrative expenses	26.4	31.0	53.3	56.7
Non-underwriting expenses:
Interest and other financing expenses	4.7	4.8	9.4	9.8
Total expenses	100.5	116.6	204.8	216.1
Income (loss) before income taxes	(23.6)	65.5	73.2	175.9
Income tax benefit	0.4	0	0.2	0
Net income (loss)	(23.2)	65.5	73.4	175.9
Net income attributable to non-controlling interest	(0.7)		(1.9)
Net income (loss) available to the Company	(23.9)	65.5	71.5	175.9
Dividends declared on Preferred Shares	(3.4)	(3.4)	(6.7)	(6.7)
Net income (loss) available to the Company's common shareholders	(27.3)	62.1	64.8	169.2
Net income (loss)	(23.2)	65.5	73.4	175.9
Net change in foreign currency translation	0.3	(1.6)	(3.2)	(1.2)
Comprehensive income (loss)	(22.9)	63.9	70.2	174.7
Net income attributable to non-controlling interest	(0.7)		(1.9)
Comprehensive income (loss) available to the Company	$ (23.6)	$ 63.9	$ 68.3	$ 174.7
Per share data:
Basic and diluted earnings (loss) per Common Share (in dollars per share)	$ (0.52)	$ 1.06	$ 1.19	$ 2.82
Dividends declared per Common Share (in dollars per share)	$ 0.115	$ 0.105	$ 0.23	$ 0.21