Income Taxes (Schedule of Provision (Benefit) for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
U.S. federal tax	$ 31.3	$ 52.2	$ 27.7
U.S. state and local tax	1.7	6.0	4.2
Non-U.S. tax	20.6	13.6	8.0
Total current	53.6	71.8	39.9
Deferred:
U.S. federal tax	(2.8)	(13.8)	(1.0)
U.S. state and local tax	(0.4)	(2.3)	8.7
Non-U.S. tax	1.1	(12.3)	0.5
Total deferred	(2.1)	(28.4)	8.2
Total provision for income taxes	51.5	43.4	48.1
Excess tax benefits from share-based compensation	$ 0.9	$ 0.8	$ 1.9