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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |
Document Period End Date | Dec. 31, 2013
Total fixed maturity available-for-sale securities, Amortized Cost | $ 15,863.3
Total fixed maturity available-for-sale securities, Fair Value | 16,086.6
Asset-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 1,590.7
Other securities which provide for periodic payments, Fair Value | 1,601.8
Commercial mortgage-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 422.6
Other securities which provide for periodic payments, Fair Value | 444.6
Structured hybrids [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 32.8
Other securities which provide for periodic payments, Fair Value | 35.5
Agency residential mortgage-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 88.9
Other securities which provide for periodic payments, Fair Value | 91.0
Non-agency residential mortgage-backed securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Other securities which provide for periodic payments, Amortized Cost | 1,564.1
Other securities which provide for periodic payments, Fair Value | 1,652.0
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 | 345.5
Due after one year through five years, Amortized Cost | 3,059.2
Due after five years through ten years, Amortized Cost | 3,315.1
Due after ten years, Amortized Cost | 5,444.4
Subtotal, Amortized Cost | 12,164.2
Due in one year or less, Fair Value | 348.1
Due after one year through five years, Fair Value | 3,133.2
Due after five years through ten years, Fair Value | 3,332.1
Due after ten years, Fair Value | 5,448.3
Subtotal, Fair Value | $ 12,261.7

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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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing after 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, which 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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