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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
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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)

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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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