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Gains and Losses on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) on Derivatives | $ 0.7 | $ (0.2)
Net Realized Investment Gain (Loss) | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) on Derivatives | (1.0) | 8.5
Net Realized Investment Gain (Loss) | Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) on Derivatives | 0.0 | (0.3)
Net Realized Investment Gain (Loss) | Not Designated as Hedging Instrument | Foreign Exchange Contracts |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) on Derivatives | 0.7 | 0.2
Net Realized Investment Gain (Loss) | Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) on Derivatives | $ (1.7) | $ 8.6

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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