Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 882.7	$ 956.4
Over 1 year through 5 years	7,027.3	5,922.8
Over 5 years through 10 years	9,052.5	9,752.3
Over 10 years	19,277.7	19,192.1
Available-for-sale Securities, Debt Maturities, Gross Subtotal	36,240.2	35,823.6
Mortgage/Asset-Backed Securities	1,947.0	1,927.9
Total Fixed Maturity Securities	38,187.2	37,751.5
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	15.8	21.2
Over 1 year through 5 years	728.5	628.1
Over 5 years through 10 years	1,003.4	1,606.4
Over 10 years	2,734.3	4,732.7
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal	4,482.0	6,988.4
Mortgage/Asset-Backed Securities	216.0	289.1
Total Fixed Maturity Securities	4,698.0	7,277.5
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0.1	0.5
Over 1 year through 5 years	2.2	5.0
Over 5 years through 10 years	88.7	7.6
Over 10 years	195.2	42.4
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal	286.2	55.5
Mortgage/Asset-Backed Securities	1.4	0.5
Total Fixed Maturity Securities	287.6	56.0
Fair Value of Fixed Maturity Securities in Unrealized Gain Position
Fair Value Maturity Distribution [Abstract]
1 year or less	874.5	934.1
Over 1 year through 5 years	7,629.0	6,449.8
Over 5 years through 10 years	8,094.1	10,997.0
Over 10 years	19,244.0	23,200.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	35,841.6	41,581.1
Mortgage/Asset-Backed Securities	2,110.6	2,208.3
Fair value of fixed maturity securities	37,952.2	43,789.4
Fair Value of Fixed Maturity Securities in Unrealized Loss Position
Fair Value Maturity Distribution [Abstract]
1 year or less	23.9	43.0
Over 1 year through 5 years	124.6	96.1
Over 5 years through 10 years	1,873.1	354.1
Over 10 years	2,572.8	682.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	4,594.4	1,175.4
Mortgage/Asset-Backed Securities	51.0	8.2
Fair value of fixed maturity securities	$ 4,645.4	$ 1,183.6

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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