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Schedule of Unaudited Quarterly Results (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Premium Income | $ 1,888.5 | $ 1,881.2 | $ 1,875.0 | $ 1,869.5 | $ 1,868.2 | $ 1,850.2 | $ 1,849.8 | $ 1,863.2 | $ 7,514.2 | $ 7,431.4 | $ 7,475.5
Net Investment Income | 634.6 | 629.2 | 637.1 | 618.7 | 634.3 | 618.4 | 629.8 | 613.0 | 2,519.6 | 2,495.5 | 2,346.6
Net Realized Investment Gain (Loss) | 7.4 | (23.9) | (3.6) | 15.2 | 27.5 | 1.1 | (29.5) | 25.6 | (4.9) | 24.7 | 11.7
Total Revenue | 2,604.8 | 2,545.6 | 2,564.5 | 2,563.1 | 2,593.1 | 2,527.9 | 2,510.6 | 2,561.6 | 10,278.0 | 10,193.2 | 10,091.0
Income (Loss) Before Income Tax | (704.3) | 293.3 | 338.0 | 330.2 | 335.5 | 326.5 | 308.1 | 361.2 | 257.2 | 1,331.3 | 1,292.3
Net Income (Loss) | $ (425.4) | $ 205.6 | $ 229.8 | $ 225.4 | $ 225.8 | $ 220.8 | $ 209.7 | $ 229.8 | $ 235.4 | $ 886.1 | $ 852.6
Earnings Per Share, Basic | $ (1.45) | $ 0.69 | $ 0.75 | $ 0.72 | $ 0.71 | $ 0.68 | $ 0.63 | $ 0.69 | $ 0.78 | $ 2.72 | $ 2.57
Earnings Per Share, Diluted | $ (1.45) | $ 0.69 | $ 0.75 | $ 0.72 | $ 0.71 | $ 0.68 | $ 0.63 | $ 0.69 | $ 0.78 | $ 2.71 | $ 2.57

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