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Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Available-for-Sale Securities, Total Amortized Cost |  |
1 year or less | $ 715.1 | $ 685.7
Over 1 year through 5 years | 5,161.5 | 4,740.6
Over 5 years through 10 years | 9,630.5 | 9,501.6
Over 10 years | 18,499.0 | 18,570.9
Available-for-sale Securities, Debt Maturities, Gross Subtotal | 34,006.1 | 33,498.8
Mortgage/Asset-Backed Securities | 2,634.6 | 3,047.8
Total Fixed Maturity Securities | 36,640.7 | 36,546.6
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain |  |
1 year or less | 16.0 | 10.9
Over 1 year through 5 years | 449.8 | 394.1
Over 5 years through 10 years | 1,266.3 | 931.6
Over 10 years | 3,992.0 | 2,051.5
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal, Total | 5,724.1 | 3,388.1
Mortgage/Asset-Backed Securities | 344.1 | 338.3
Total Fixed Maturity Securities | 6,068.2 | 3,726.4
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss |  |
1 year or less | 0.1 | 0.4
Over 1 year through 5 years | 20.7 | 5.5
Over 5 years through 10 years | 52.8 | 37.1
Over 10 years | 143.1 | 193.8
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal, Total | 216.7 | 236.8
Mortgage/Asset-Backed Securities | 5.5 | 0.6
Total Fixed Maturity Securities | 222.2 | 237.4
Available-for-Sale Securities, Unrealized Gain Position, Fair Value |  |
Fair Value Maturity Distribution [Abstract] |  |
1 year or less | 701.4 | 532.6
Over 1 year through 5 years | 4,949.0 | 4,886.3
Over 5 years through 10 years | 9,903.8 | 9,415.0
Over 10 years | 21,082.2 | 17,138.5
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total | 36,636.4 | 31,972.4
Mortgage/Asset-Backed Securities | 2,859.4 | 3,305.5
Total Fixed Maturity Securities | 39,495.8 | 35,277.9
Available-for-Sale Securities, Unrealized Loss Position, Fair Value |  |
Fair Value Maturity Distribution [Abstract] |  |
1 year or less | 29.6 | 163.6
Over 1 year through 5 years | 641.6 | 242.9
Over 5 years through 10 years | 940.2 | 981.1
Over 10 years | 1,265.7 | 3,290.1
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total | 2,877.1 | 4,677.7
Mortgage/Asset-Backed Securities | 113.8 | 80.0
Total Fixed Maturity Securities | $ 2,990.9 | $ 4,757.7

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant