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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosure [Line Items]
Amortized Cost	$ 164.6	$ 163.9
Gross Unrealized Gains	5.2	8.0
Gross Unrealized Losses	(0.7)	(0.5)
Allowance for Credit Loss	(0.2)	(0.5)
Fair Value	168.9	170.9
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	45.7	33.7
Gross Unrealized Gains	0.2	0.3
Gross Unrealized Losses	(0.2)	0.0
Allowance for Credit Loss	0.0	0.0
Fair Value	45.7	34.0
Debt Securities, Available-for-sale, Unrealized Loss Position	28.4	0.0
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	118.9	130.2
Gross Unrealized Gains	5.0	7.7
Gross Unrealized Losses	(0.5)	(0.5)
Allowance for Credit Loss	(0.2)	(0.5)
Fair Value	123.2	136.9
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 25.8	$ 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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