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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 | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Embedded Derivative in Modified Coinsurance Arrangement |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Derivatives Measured with Unobservable Inputs, Beginning Balance | $ (15.9) | $ (46.7)
Derivative Liability Gain (Loss) Included in Earnings | (1.7) | 8.6
Derivative Liability Gain (Loss) Included in OCI | 0.0 | 0.0
Derivative Purchases | 0.0 | 0.0
Derivative Sales | 0.0 | 0.0
Derivative Transfers Into Level 3 | 0.0 | 0.0
Derivative Transfers Out of Level 3 | 0.0 | 0.0
Derivatives Measured with Unobservable Inputs, Ending Balance | (17.6) | (38.1)
States, Municipalities, and Political Subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 0.0 | 89.5
Investment Gain (Loss) included in Earnings | 0.0 | 0.0
Investment Gain (Loss) included in OCI | (0.8) | 0.0
Investment Purchases | 0.0 | 0.0
Investment Sales | (0.1) | 0.0
Investment Level 3 Transfers Into | 36.6 | 0.4
Investment Level 3 Transfers Out of | 0.0 | (89.5)
Assets Measured with Unobservable Inputs, Ending Balance | 35.7 | 0.4
Foreign Governments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 0.0 |
Investment Gain (Loss) included in Earnings | 0.0 |
Investment Gain (Loss) included in OCI | (0.4) |
Investment Purchases | 0.0 |
Investment Sales | 0.0 |
Investment Level 3 Transfers Into | 32.7 |
Investment Level 3 Transfers Out of | 0.0 |
Assets Measured with Unobservable Inputs, Ending Balance | 32.3 |
Public Utilities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 207.7 | 265.3
Investment Gain (Loss) included in Earnings | 0.0 | 0.0
Investment Gain (Loss) included in OCI | (6.7) | 1.8
Investment Purchases | 0.0 | 8.0
Investment Sales | (1.1) | 0.0
Investment Level 3 Transfers Into | 200.9 | 112.6
Investment Level 3 Transfers Out of | (116.6) | (75.2)
Assets Measured with Unobservable Inputs, Ending Balance | 284.2 | 312.5
Mortgage/Asset-Backed Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 0.0 |
Investment Gain (Loss) included in Earnings | 0.0 |
Investment Gain (Loss) included in OCI | 0.0 |
Investment Purchases | 0.0 |
Investment Sales | 0.0 |
Investment Level 3 Transfers Into | 0.5 |
Investment Level 3 Transfers Out of | 0.0 |
Assets Measured with Unobservable Inputs, Ending Balance | 0.5 |
All Other Corporate Bonds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 1,150.1 | 1,459.7
Investment Gain (Loss) included in Earnings | 0.0 | 0.0
Investment Gain (Loss) included in OCI | (22.1) | 13.1
Investment Purchases | 0.0 | 0.0
Investment Sales | (11.7) | (36.4)
Investment Level 3 Transfers Into | 466.0 | 143.9
Investment Level 3 Transfers Out of | (595.1) | (657.3)
Assets Measured with Unobservable Inputs, Ending Balance | 987.2 | 923.0
Redeemable Preferred Stocks |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 22.8 | 23.2
Investment Gain (Loss) included in Earnings | 0.0 | 0.0
Investment Gain (Loss) included in OCI | (0.6) | (0.3)
Investment Purchases | 0.0 | 0.0
Investment Sales | 0.0 | 0.0
Investment Level 3 Transfers Into | 0.0 | 0.0
Investment Level 3 Transfers Out of | 0.0 | 0.0
Assets Measured with Unobservable Inputs, Ending Balance | 22.2 | 22.9
Fixed Maturity Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 1,380.6 | 1,837.7
Investment Gain (Loss) included in Earnings | 0.0 | 0.0
Investment Gain (Loss) included in OCI | (30.6) | 14.6
Investment Purchases | 0.0 | 8.0
Investment Sales | (12.9) | (36.4)
Investment Level 3 Transfers Into | 736.7 | 256.9
Investment Level 3 Transfers Out of | (711.7) | (822.0)
Assets Measured with Unobservable Inputs, Ending Balance | 1,362.1 | 1,258.8
Equity Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Assets Measured with Unobservable Inputs, Beginning Balance | 1.1 | 1.2
Investment Gain (Loss) included in Earnings | 0.0 | 0.0
Investment Gain (Loss) included in OCI | 0.0 | 0.0
Investment Purchases | 0.0 | 0.0
Investment Sales | 0.0 | 0.0
Investment Level 3 Transfers Into | 0.0 | 0.0
Investment Level 3 Transfers Out of | 0.0 | 0.0
Assets Measured with Unobservable Inputs, Ending Balance | $ 1.1 | $ 1.2

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: 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=66048111&loc=d3e19207-110258 + Details
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