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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value Disclosure [Line Items]
Amortized Cost	$ 169.3	$ 163.9
Gross Unrealized Gains	3.8	8.0
Gross Unrealized Losses	1.1	0.5
Allowance for Credit Loss	(0.2)	(0.5)
Fair Value	171.8	170.9
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	52.8	33.7
Gross Unrealized Gains	0.1	0.3
Gross Unrealized Losses	0.4	0.0
Allowance for Credit Loss	0.0	0.0
Fair Value	52.5	34.0
Debt Securities, Available-for-sale, Unrealized Loss Position	36.2	0.0
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	116.5	130.2
Gross Unrealized Gains	3.7	7.7
Gross Unrealized Losses	0.7	0.5
Allowance for Credit Loss	(0.2)	(0.5)
Fair Value	119.3	136.9
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 35.4	$ 13.2

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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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