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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosure [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 22.1	$ 0.0
Amortized Cost	163.8	163.9
Gross Unrealized Gains	5.5	8.0
Gross Unrealized Losses	(1.1)	(0.5)
Allowance for Credit Loss	(0.3)	(0.5)
Fair Value	167.9	170.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	25.7	13.2
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	37.1	33.7
Gross Unrealized Gains	0.2	0.3
Gross Unrealized Losses	(0.3)	0.0
Allowance for Credit Loss	0.0	0.0
Fair Value	37.0	34.0
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	126.7	130.2
Gross Unrealized Gains	5.3	7.7
Gross Unrealized Losses	(0.8)	(0.5)
Allowance for Credit Loss	(0.3)	(0.5)
Fair Value	$ 130.9	$ 136.9

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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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