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Derivative Contracts - Gain/(Loss) Recognized in Income on Derivative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) to net income from derivative instruments	$ (34.0)	$ 10.9
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	12.9	15.2
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	(0.9)	(8.1)
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	$ (6.5)	$ (14.0)

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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
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-Publisher FASB
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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-Topic 815
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-Section 50
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Amount of gain (loss) from increase (decrease) in fair value of foreign currency derivative and nonderivative instruments designated as fair value hedge recognized in earnings and from related hedged item to extent that fair value hedge was determined to be effective.

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