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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value Disclosure [Line Items]
Amortized Cost	$ 91.9	$ 169.0
Gross Unrealized Gains	0.5	0.8
Gross Unrealized Losses	5.6	10.1
Allowance for Credit Loss	(0.1)	(0.6)
Fair Value	86.7	159.1
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost		63.8
Gross Unrealized Gains		0.0
Gross Unrealized Losses		3.2
Allowance for Credit Loss		0.0
Fair Value		60.6
Debt Securities, Available-for-sale, Unrealized Loss Position		58.7
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	91.9	105.2
Gross Unrealized Gains	0.5	0.8
Gross Unrealized Losses	5.6	6.9
Allowance for Credit Loss	(0.1)	(0.6)
Fair Value	86.7	98.5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 70.1	$ 74.8

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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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