Income Taxes (Reconciliation Between Federal Statutory Tax Rate and Effective Tax Rates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Rate reconciliation
Tax at statutory rate	$ 24.5	$ 25.1	$ 21.1
Effect of state income taxes, net	0.6	1.4	1.1
Effect of foreign operations	(1.6)	(0.9)	(0.2)
Valuation allowance	(0.7)	(1.1)	(1.6)
Non-deductible items	1.7	1.8	0.7
Manufacturer's deduction	(1.1)	(1.4)	(1.4)
Other, net	(2.1)	0.0	(0.3)
Income tax expense	$ 21.3	$ 24.9	$ 19.4