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Derivative Contracts - Gain/(Loss) Recognized in Income on Derivative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	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	$ 32.7	$ (35.6)	$ 10.3	$ (24.3)	$ 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	5.1	0.0	11.9	8.3	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	(0.3)	(2.4)	(0.3)	(6.1)	(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	$ 2.1	$ (6.4)	$ 1.9	$ (10.7)	$ (14.0)	$ 15.4

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-Topic 815
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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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.

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