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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |
Total fixed maturity available-for-sale securities, Amortized Cost | $ 15,200.0
Total fixed maturity available-for-sale securities, Fair Value | 16,183.5
Asset-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 1,388.5
Other securities which provide for periodic payments, Fair Value | 1,418.4
Commercial mortgage-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 506.8
Other securities which provide for periodic payments, Fair Value | 546.2
Structured hybrids [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 83.6
Other securities which provide for periodic payments, Fair Value | 87.1
Agency residential mortgage-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 122.2
Other securities which provide for periodic payments, Fair Value | 126.0
Non-agency residential mortgage-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 1,209.5
Other securities which provide for periodic payments, Fair Value | 1,298.5
Non-structured Hybrids [Member] | Corporate [Member] | Municipal [Member] | U.S. Government securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Due in one year or less, Amortized Cost | 615.2
Due after one year through five years, Amortized Cost | 2,888.8
Due after five years through ten years, Amortized Cost | 3,702.2
Due after ten years, Amortized Cost | 4,683.2
Subtotal, Amortized Cost | 11,889.4
Due in one year or less, Fair Value | 619.4
Due after one year through five years, Fair Value | 2,985.3
Due after five years through ten years, Fair Value | 3,958.0
Due after ten years, Fair Value | 5,144.6
Subtotal, Fair Value | $ 12,707.3

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph c -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. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -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. + Details
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