Supplemental Financial Information (Interest Income (Expense), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Supplemental Income Statement Elements [Abstract]
Interest on revolving credit facility	$ 0.0	$ (0.5)
Line of credit fees	(0.3)	(0.3)
Debt issuance amortization costs	(0.1)	(0.1)
Interest income	0.8	0.1
Other	(0.1)	0.0
Total interest income (expense), net	$ 0.3	$ (0.8)