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Derivative Contracts - Gain/(Loss) Recognized in Income on Derivative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Not Designated as Hedging Instrument | Foreign exchange contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) to net income from derivative instruments | $ 10.9 | $ (66.0)
Not Designated as Hedging Instrument | Loss portfolio transfer liability, embedded derivative |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) to net income from derivative instruments | 15.2 | (14.5)
Designated as Hedging Instrument | Foreign exchange contracts | General, administrative and corporate expenses |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on foreign currency fair value hedge derivatives | (8.1) | 5.9
Designated as Hedging Instrument | Foreign exchange contracts | Net change from current period hedged transactions |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on foreign currency fair value hedge derivatives | $ (14.0) | $ 15.4

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
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