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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Revenues (including realized gains and losses)	$ 566.4	$ 697.4	$ 542.3	$ 629.7	$ 593.4	$ 501.7	$ 552.4	$ 525.6	$ 2,435.7	$ 2,173.1	$ 2,333.7
Total expenses	617.2	562.3	504.7	488.8	495.0	500.5	516.6	563.0	2,172.9	2,075.1	2,144.4
Pre-tax income (loss)	(50.8)	135.1	37.6	140.9	98.4	1.2	35.8	(37.4)	262.8	98.0	189.3
Tax benefit (expense)	101.0	(47.8)	(6.4)	(31.1)	110.9	0.6	(8.8)	7.3	15.7	110.0	(29.6)
Income (loss) from continuing operations	50.2	87.3	31.2	109.8	209.3	1.8	27.0	(30.1)	278.5	208.0	159.7
Net loss from other discontinued operations, net of tax	0.5	(106.8)	0.5	(9.2)	647.6	(30.1)	(2.4)	6.5	(24.0)	(36.7)	(30.1)
Non-controlling interest in consolidated subsidiaries	12.0	30.9	(12.1)	(16.8)	(20.3)	11.0	(20.8)	(11.4)	(14.0)	41.5	53.0
Equity in earnings (losses) of unconsolidated affiliates	5.5	7.7	6.5	10.2	(36.4)	1.5	7.9	6.8	29.9	(20.2)	9.9
Net Income (Loss) Available to Common Stockholders, Basic	$ 68.2	$ 19.1	$ 26.1	$ 94.0	$ 800.2	$ (15.8)	$ 11.7	$ (28.2)	$ 207.4	$ 767.9	$ 86.5
Basic earnings (loss) per share
Continuing operations	$ 10.36	$ 19.11	$ 3.85	$ 13.85	$ 20.03	$ 1.80	$ 1.78	$ (4.33)	$ 47.41	$ 18.56	$ 13.63
Discontinued operations	$ 0.07	$ (16.21)	$ 0.07	$ (1.24)	$ 85.01	$ (3.80)	$ (0.30)	$ 0.82	$ (16.91)	$ 78.88	$ (3.51)
Total consolidated operations	$ 10.43	$ 2.90	$ 3.92	$ 12.61	$ 105.04	$ (2.00)	$ 1.48	$ (3.51)	$ 30.50	$ 97.44	$ 10.12
Diluted earnings (loss) per share
Continuing operations	$ 10.36	$ 19.11	$ 3.85	$ 13.85	$ 20.03	$ 1.80	$ 1.78	$ (4.33)	$ 47.41	$ 18.56	$ 13.63
Discontinued operations	$ 0.07	$ (16.21)	$ 0.07	$ (1.24)	$ 85.01	$ (3.80)	$ (0.30)	$ 0.82	$ (16.91)	$ 78.88	$ (3.51)
Total consolidated operations	$ 10.43	$ 2.90	$ 3.92	$ 12.61	$ 105.04	$ (2.00)	$ 1.48	$ (3.51)	$ 30.50	$ 97.44	$ 10.12
Adjusted book value per share	$ 587.63	$ 573.66	$ 564.77	$ 565.38	$ 542.11	$ 436.18	$ 542.11	$ 446.70

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