Income Taxes (Income from Continuing Operations Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ (27.7)	$ 26.2	$ 35.1
Outside the United States	20.4	28.7	36.7
Income before income taxes	$ (7.3)	$ 54.9	$ 71.8