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Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Available-for-Sale Securities, Total Amortized Cost |  |
1 year or less | $ 1,059.7 | $ 956.4
Over 1 year through 5 years | 5,927.8 | 5,922.8
Over 5 years through 10 years | 9,756.5 | 9,752.3
Over 10 years | 19,121.5 | 19,192.1
Available-for-sale Securities, Debt Maturities, Gross Subtotal | 35,865.5 | 35,823.6
Mortgage/Asset-Backed Securities | 1,767.1 | 1,927.9
Total Fixed Maturity Securities | 37,632.6 | 37,751.5
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain |  |
1 year or less | 23.6 | 21.2
Over 1 year through 5 years | 654.8 | 628.1
Over 5 years through 10 years | 1,548.7 | 1,606.4
Over 10 years | 4,347.5 | 4,732.7
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal, Total | 6,574.6 | 6,988.4
Mortgage/Asset-Backed Securities | 275.6 | 289.1
Total Fixed Maturity Securities | 6,850.2 | 7,277.5
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss |  |
1 year or less | 0.2 | 0.5
Over 1 year through 5 years | 1.7 | 5.0
Over 5 years through 10 years | 8.0 | 7.6
Over 10 years | 35.9 | 42.4
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal, Total | 45.8 | 55.5
Mortgage/Asset-Backed Securities | 0.5 | 0.5
Total Fixed Maturity Securities | 46.3 | 56.0
Available-for-Sale Securities, Unrealized Gain Position, Fair Value |  |
Fair Value Maturity Distribution [Abstract] |  |
1 year or less | 1,040.1 | 934.1
Over 1 year through 5 years | 6,501.5 | 6,449.8
Over 5 years through 10 years | 10,799.5 | 10,997.0
Over 10 years | 22,461.7 | 23,200.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total | 40,802.8 | 41,581.1
Mortgage/Asset-Backed Securities | 2,035.9 | 2,208.3
Fair value of fixed maturity securities | 42,838.7 | 43,789.4
Available-for-Sale Securities, Unrealized Loss Position, Fair Value |  |
Fair Value Maturity Distribution [Abstract] |  |
1 year or less | 43.0 | 43.0
Over 1 year through 5 years | 79.4 | 96.1
Over 5 years through 10 years | 497.7 | 354.1
Over 10 years | 971.4 | 682.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total | 1,591.5 | 1,175.4
Mortgage/Asset-Backed Securities | 6.3 | 8.2
Fair value of fixed maturity securities | $ 1,597.8 | $ 1,183.6

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Namespace Prefix: | us-gaap_
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