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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value Disclosure [Line Items]
Amortized Cost	$ 174.6	$ 169.3
Gross Unrealized Gains	0.0	3.8
Gross Unrealized Losses	(15.1)	(1.1)
Allowance for Credit Loss	(1.7)	(0.2)
Fair Value	157.8	171.8
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	69.7	52.8
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	(4.8)	(0.4)
Allowance for Credit Loss	0.0	0.0
Fair Value	64.9	52.5
Debt Securities, Available-for-sale, Unrealized Loss Position	62.3	36.2
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	104.9	116.5
Gross Unrealized Gains	0.0	3.7
Gross Unrealized Losses	(10.3)	(0.7)
Allowance for Credit Loss	(1.7)	(0.2)
Fair Value	92.9	119.3
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 85.1	$ 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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