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Parent Company Balance Sheet (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fixed Maturity Securities, Amortized Cost | $ 38,803.4 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | $ 38,289.6 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Parent Company |  |
Fixed Maturity Securities, Amortized Cost | $ 161.4 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 143.9 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |