Income Taxes (Reconciliation Between Federal Statutory Tax Rate and Effective Tax Rates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ 16.7	$ 14.3	$ 24.5
Effect of state income taxes, net	0.7	0.2	0.6
Effect of foreign operations	(5.2)	(2.1)	(1.6)
Valuation allowance	5.3	0.5	(0.7)
Uncertain tax positions	(2.0)	(4.0)	0.1
Non-deductible items	0.5	0.6	0.5
Non-deductible compensation	0.4	0.8	1.2
Manufacturer's deduction	(0.8)	(0.5)	(1.1)
Net impact of U.S. Tax Act	4.2	0.0	0.0
Other, net	(1.6)	(1.0)	(2.2)
Income tax expense	$ 18.2	$ 8.8	$ 21.3