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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Fair Value Disclosure [Line Items]
Amortized Cost	$ 85.5		$ 91.9
Gross Unrealized Gains	0.6		0.5
Gross Unrealized Losses	(4.7)		(5.6)
Allowance for Credit Loss	(0.2)		(0.1)
Fair Value	81.2		86.7
Debt Securities, Available-for-Sale, Realized Gain	0.0	$ 0.4
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	85.5		91.9
Gross Unrealized Gains	0.6		0.5
Gross Unrealized Losses	(4.7)		(5.6)
Allowance for Credit Loss	(0.2)		(0.1)
Fair Value	81.2		86.7
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 63.7		$ 70.1

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