Supplemental Financial Information (Interest Income (Expense), Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Supplemental Income Statement Elements [Abstract]
Interest on revolving credit facility	$ 0.0	$ 0.0	$ 0.0	$ (0.5)
Line of credit fees	(0.3)	(0.3)	(0.6)	(0.6)
Debt issuance amortization costs	(0.1)	(0.1)	(0.2)	(0.2)
Interest income	0.8	0.2	1.6	0.3
Other	0.0	0.0	(0.1)	0.0
Total interest income (expense), net	$ 0.4	$ (0.2)	$ 0.7	$ (1.0)