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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | $ 0.4 | $ 0.6 | $ 2.0 | $ 0.0
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | 1.2 | 5.8 | 8.9 | 5.5
Foreign Exchange Contracts | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | 0.4 | 0.6 | 2.0 | 0.0
Embedded Derivative in Modified Coinsurance Arrangement | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | 0.8 | 5.2 | 6.9 | 5.5
Total Return Swap | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Gain (Loss) on Derivatives | $ (0.8) | $ (4.2) | $ (8.7) | $ (8.8)

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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 -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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