Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 1,156.4	$ 956.4
Over 1 year through 5 years	6,703.5	5,922.8
Over 5 years through 10 years	9,325.0	9,752.3
Over 10 years	19,110.4	19,192.1
Available-for-sale Securities, Debt Maturities, Gross Subtotal	36,295.3	35,823.6
Mortgage/Asset-Backed Securities	1,639.3	1,927.9
Total Fixed Maturity Securities	37,934.6	37,751.5
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	21.0	21.2
Over 1 year through 5 years	671.2	628.1
Over 5 years through 10 years	1,036.0	1,606.4
Over 10 years	2,980.7	4,732.7
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal	4,708.9	6,988.4
Mortgage/Asset-Backed Securities	220.0	289.1
Total Fixed Maturity Securities	4,928.9	7,277.5
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0.6	0.5
Over 1 year through 5 years	3.9	5.0
Over 5 years through 10 years	95.4	7.6
Over 10 years	167.1	42.4
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal	267.0	55.5
Mortgage/Asset-Backed Securities	2.3	0.5
Total Fixed Maturity Securities	269.3	56.0
Fair Value of Fixed Maturity Securities in Unrealized Gain Position
Fair Value Maturity Distribution [Abstract]
1 year or less	1,123.1	934.1
Over 1 year through 5 years	7,123.3	6,449.8
Over 5 years through 10 years	8,140.6	10,997.0
Over 10 years	19,597.8	23,200.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	35,984.8	41,581.1
Mortgage/Asset-Backed Securities	1,820.3	2,208.3
Fair value of fixed maturity securities	37,805.1	43,789.4
Fair Value of Fixed Maturity Securities in Unrealized Loss Position
Fair Value Maturity Distribution [Abstract]
1 year or less	53.7	43.0
Over 1 year through 5 years	247.5	96.1
Over 5 years through 10 years	2,125.0	354.1
Over 10 years	2,326.2	682.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal	4,752.4	1,175.4
Mortgage/Asset-Backed Securities	36.7	8.2
Fair value of fixed maturity securities	$ 4,789.1	$ 1,183.6

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

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