Income Taxes (Reconciliation Between Federal Statutory Tax Rate and Effective Tax Rates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax (benefit) expense at U.S. statutory rate	$ (1.5)	$ 11.5	$ 15.1
Effect of state income taxes, net	(0.3)	0.3	0.6
Effect of foreign operations	1.5	1.9	3.5
Valuation allowance	0.6	0.6	(3.0)
Uncertain tax positions	(1.0)	0.1	(0.3)
Non-deductible items	1.5	2.5	1.3
Non-deductible compensation	0.6	0.0	0.0
CARES Act NOL carryback	(5.3)	0.0	0.0
Foreign tax credit	(0.8)	(1.7)	(2.2)
Other tax credits	(0.3)	(0.8)	0.0
GILTI	1.8	1.9	3.1
FDII	0.0	(0.8)	(0.6)
Other, net	0.7	(0.3)	(0.9)
Income tax (benefit) expense	$ (2.5)	$ 15.2	$ 16.6