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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value Disclosure [Line Items]
Amortized Cost	$ 162.8	$ 166.7
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(11.7)	(14.2)
Allowance for Credit Loss	(0.8)	(0.9)
Fair Value	150.4	151.6
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	67.0	67.7
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(3.3)	(4.5)
Allowance for Credit Loss	0.0	0.0
Fair Value	63.8	63.2
Debt Securities, Available-for-sale, Unrealized Loss Position	56.2	61.0
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	95.8	99.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(8.4)	(9.7)
Allowance for Credit Loss	(0.8)	(0.9)
Fair Value	86.6	88.4
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 82.5	$ 85.5

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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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