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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.

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