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Gains and Losses on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | $ 3.7 | $ (0.1) | $ 5.5 | $ 1.6
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | 2.9 | 1.7 | 1.3 | 20.2
Credit Default Swaps | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | 0.0 | (0.1) | 0.0 | (0.2)
Foreign Exchange Contracts | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | 3.7 | 0.1 | 5.5 | 1.8
Embedded Derivative in Modified Coinsurance Arrangement | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | (0.8) | 1.7 | (4.2) | 18.6
Total Return Swap | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | $ 13.0 | $ (5.0) | $ 18.7 | $ (3.7)

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + 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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