Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 669.6	$ 685.7
Over 1 year through 5 years	5,061.2	4,740.6
Over 5 years through 10 years	9,563.7	9,501.6
Over 10 years	18,687.8	18,570.9
Available-for-sale Securities, Debt Maturities, Gross Subtotal	33,982.3	33,498.8
Mortgage/Asset-Backed Securities	2,764.4	3,047.8
Total Fixed Maturity Securities	36,746.7	36,546.6
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	13.4	10.9
Over 1 year through 5 years	442.7	394.1
Over 5 years through 10 years	1,191.2	931.6
Over 10 years	3,923.8	2,051.5
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal, Total	5,571.1	3,388.1
Mortgage/Asset-Backed Securities	386.5	338.3
Total Fixed Maturity Securities	5,957.6	3,726.4
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0.2	0.4
Over 1 year through 5 years	15.7	5.5
Over 5 years through 10 years	98.5	37.1
Over 10 years	151.3	193.8
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal, Total	265.7	236.8
Mortgage/Asset-Backed Securities	3.9	0.6
Total Fixed Maturity Securities	269.6	237.4
Available-for-Sale Securities, Unrealized Gain Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	636.9	532.6
Over 1 year through 5 years	4,956.9	4,886.3
Over 5 years through 10 years	9,257.3	9,415.0
Over 10 years	21,073.1	17,138.5
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	35,924.2	31,972.4
Mortgage/Asset-Backed Securities	3,030.7	3,305.5
Total Fixed Maturity Securities	38,954.9	35,277.9
Available-for-Sale Securities, Unrealized Loss Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	45.9	163.6
Over 1 year through 5 years	531.3	242.9
Over 5 years through 10 years	1,399.1	981.1
Over 10 years	1,387.2	3,290.1
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	3,363.5	4,677.7
Mortgage/Asset-Backed Securities	116.3	80.0
Total Fixed Maturity Securities	$ 3,479.8	$ 4,757.7

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For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-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.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15C

-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.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-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.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 2

-Subparagraph (b)-(g)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 137

-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.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-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.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant