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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