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Investments Net Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Gain (Loss) on Securities [Line Items]        
Gross investment income $ 176.9 $ 175.1 $ 353.1 $ 346.6
Investment expenses [1] 5.4 7.6 10.8 14.9
Net Investment Income, Total 171.5 167.4 342.2 331.6
Net realized gains (losses) (4.7) (110.6) 38.5 21.4
Equity Securities, FV-NI, Unrealized Gain (Loss) (4.9) (86.3) 12.7 (99.6)
Gain (Loss) on Investments (7.3) (140.5) 47.7 26.6
Income Taxes Credits On Realized Investment Gains Losses (2.6) (29.9) 9.1 5.2
Changes in unrealized investment gains (losses) on investments 90.6 12.1 232.3 (73.4)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax 19.0 2.6 48.9 (15.3)
Net unrealized gains (losses) on securities, net of tax 71.6 9.5 183.3 (58.0)
Debt Securities, Available-for-sale, Realized Gain 1.5 1.3 2.1 1.9
Debt Securities, Available-for-sale, Realized Loss 4.1 53.9 5.8 69.9
Debt Securities, Available-for-sale, Realized Gain (Loss) (2.6) (52.5) (3.6) (67.9)
OtherThanTemporaryImpairmentLossesCreditLossesOtherInvestmentsDebtSecuritiesSaleOfSubsidiaryRecognizedInEarnings 0.0 (2.4) 0.0 (5.4)
Realized Investment Gains Losses From Sales (2.4) (51.7) 34.9 131.7
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Equity securities, gross realized gains 11.4 0.9 51.4 199.7
Equity securities, gross realized losses (11.3) 0.0 (12.4) 0.0
Equity securities, net realized gains (losses) 0.1 0.9 38.9 199.7
Fixed Income Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Changes in unrealized investment gains (losses) on investments 90.7 11.8 230.6 (73.8)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax 19.0 2.5 48.6 (15.4)
Net changes in unrealized investment gains (losses) 71.6 9.2 182.0 (58.4)
Other long-term investments [Member]        
Gain (Loss) on Securities [Line Items]        
Changes in unrealized investment gains (losses) on investments 0.0 0.3 1.6 0.4
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax 0.0 0.0 0.3 0.0
Net changes in unrealized investment gains (losses) 0.0 0.2 1.3 0.3
Other Investments        
Gain (Loss) on Securities [Line Items]        
Investment gains (losses) - other investments 0.0 0.0 (0.3) 0.0
Fixed Income Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Gross investment income 141.2 128.3 279.8 254.7
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Gross investment income 20.9 19.2 41.7 40.0
Short-term Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Gross investment income 11.8 19.6 23.8 36.8
Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Gross investment income [1] $ 2.8 $ 7.8 $ 7.6 $ 14.9
[1]
(a) Includes interest on funds held.