Income Taxes (Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Federal:
Current	$ 0.0	$ 0.2	$ (9.5)
Deferred	0.0	0.0	8.9
Total Federal	0.0	0.2	(0.6)
Foreign:
Current	25.6	35.5	31.4
Deferred	11.8	(20.0)	2.6
Total Foreign	37.4	15.5	34.0
State and Local:
Current	0.0	0.5	0.6
Deferred	0.0	0.0	0.0
Total State and other	0.0	0.5	0.6
Total	$ 37.4	$ 16.2	$ 34.0