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Investments Textuals (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ (4.9)	$ (86.3)	$ 12.7	$ (99.6)
Net Unrealized Gains Losses Recognized from Changes in Fair Value of Equity Securities Held	0.6	$ (85.5)	61.2	$ 97.2
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 1.6		$ 1.6		$ 1.6

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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