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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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