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Derivatives - Classification and Net Impact on Earnings of Derivatives (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Foreign currency forwards
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	$ 40.8	$ (17.4)
Weather derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	0.3	(1.5)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	(0.2)	1.3
Reinsurance contracts accounted for as derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on earnings	$ 0.0	$ (4.8)

X

- 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

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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

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