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Investments Equity Securities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 2,567.8 | $ 2,540.7
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, gross unrealized gains | 1,167.5 | 1,148.6
Equity securities, gross unrealized losses | 22.4 | 18.6
Equity securities - cost | 1,422.8 | 1,410.7
Equity securities | $ 2,567.8 | $ 2,540.7

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