Supplemental Financial Information (Schedule of Components of Interest Expense, Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplemental Income Statement Elements [Abstract]
Interest on revolving credit facility	$ 9.6	$ 9.0	$ 0.9
Line of credit fees	0.8	0.5	1.1
Debt issuance amortization costs	0.7	0.7	0.7
Interest income	(1.2)	(0.7)	(0.5)
Other	0.2	0.0	0.4
Total interest expense, net	$ 10.1	$ 9.5	$ 2.5