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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosure [Line Items]
Amortized Cost	$ 166.7	$ 169.3
Gross Unrealized Gains	0.0	3.8
Gross Unrealized Losses	14.2	1.1
Allowance for Credit Loss	(0.9)	0.2
Fair Value	151.6	171.8
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	67.7	52.8
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	4.5	0.4
Allowance for Credit Loss	0.0	0.0
Fair Value	63.2	52.5
Debt Securities, Available-for-sale, Unrealized Loss Position	61.0	36.2
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	99.0	116.5
Gross Unrealized Gains	0.0	3.7
Gross Unrealized Losses	9.7	0.7
Allowance for Credit Loss	(0.9)	0.2
Fair Value	88.4	119.3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 85.5	$ 35.4

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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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