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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value Disclosure [Line Items]
Amortized Cost	$ 160.2	$ 169.3
Gross Unrealized Gains	0.1	3.8
Gross Unrealized Losses	(9.5)	(1.1)
Allowance for Credit Loss	(1.0)	(0.2)
Fair Value	149.8	171.8
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	51.1	52.8
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	(2.4)	(0.4)
Allowance for Credit Loss	0.0	0.0
Fair Value	48.7	52.5
Debt Securities, Available-for-sale, Unrealized Loss Position	47.0	36.2
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	109.1	116.5
Gross Unrealized Gains	0.1	3.7
Gross Unrealized Losses	(7.1)	(0.7)
Allowance for Credit Loss	(1.0)	(0.2)
Fair Value	101.1	119.3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 89.9	$ 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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