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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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This item represents the gross unrealized gains for equity securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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