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Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
States, Municipalities, and Political Subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | $ 128.7 | $ 68.1
Investment Gain (Loss) included in Earnings | 0 | 0
Investment Gain (Loss) included in OCI | 2.7 | (3.2)
Purchases | 0 | 0
Sales | 0 | 0
Level 3 Transfers Into | 43.4 | 9.9
Level 3 Transfers Out of | 0 | (8.4)
End of Period | 174.8 | 66.4
Foreign Governments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | 82.1 |
Investment Gain (Loss) included in Earnings | 0 |
Investment Gain (Loss) included in OCI | 0.5 |
Purchases | 0 |
Sales | 0 |
Level 3 Transfers Into | 0 |
Level 3 Transfers Out of | 0 |
End of Period | 82.6 |
Public Utilities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | 574.4 | 338.9
Investment Gain (Loss) included in Earnings | 0 | 0
Investment Gain (Loss) included in OCI | 1.1 | (0.1)
Purchases | 0 | 0
Sales | (0.1) | (0.9)
Level 3 Transfers Into | 252.3 | 416.9
Level 3 Transfers Out of | (425.2) | (206.5)
End of Period | 402.5 | 548.3
Mortgage/Asset-backed Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | 0.5 | 31.7
Investment Gain (Loss) included in Earnings | 0 | 0
Investment Gain (Loss) included in OCI | 0 | 2.4
Purchases | 0 | 0
Sales | 0 | 0
Level 3 Transfers Into | 0 | 0
Level 3 Transfers Out of | 0 | (12.8)
End of Period | 0.5 | 21.3
All Other Corporate Bonds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | 1,177.8 | 665.5
Investment Gain (Loss) included in Earnings | 0.8 | 0
Investment Gain (Loss) included in OCI | (8.8) | 7.0
Purchases | 30.3 | 12.0
Sales | (18.1) | (40.3)
Level 3 Transfers Into | 382.4 | 223.0
Level 3 Transfers Out of | (572.1) | (134.0)
End of Period | 992.3 | 733.2
Redeemable Preferred Stocks |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | 24.8 | 37.2
Investment Gain (Loss) included in Earnings | 0 | (1.0)
Investment Gain (Loss) included in OCI | 0 | 2.1
Purchases | 0 | 0
Sales | 0 | (14.3)
Level 3 Transfers Into | 0 | 6.3
Level 3 Transfers Out of | 0 | 0
End of Period | 24.8 | 30.3
Total Fixed Maturity Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | 1,988.3 | 1,141.4
Investment Gain (Loss) included in Earnings | 0.8 | (1.0)
Investment Gain (Loss) included in OCI | (4.5) | 8.2
Purchases | 30.3 | 12.0
Sales | (18.2) | (55.5)
Level 3 Transfers Into | 678.1 | 656.1
Level 3 Transfers Out of | (997.3) | (361.7)
End of Period | 1,677.5 | 1,399.5
Equity Securites |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | 4.3 | 11.2
Investment Gain (Loss) included in Earnings | 0 | 0
Investment Gain (Loss) included in OCI | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Level 3 Transfers Into | 0 | 0
Level 3 Transfers Out of | 0 | (6.7)
End of Period | 4.3 | 4.5
Embedded Derivative in Modified Coinsurance Arrangement |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning of Period | (83.9) | (135.7)
Investment Gain (Loss) included in Earnings | 6.4 | 12.3
Investment Gain (Loss) included in OCI | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Level 3 Transfers Into | 0 | 0
Level 3 Transfers Out of | 0 | 0
End of Period | $ (77.5) | $ (123.4)

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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -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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