Property, Net - Components of Property, Net (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, gross	$ 1,382.2	$ 1,290.2
Less accumulated depreciation and amortization	(920.6)	(863.9)
Property, net	461.6	426.3	$ 399.9
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, gross	40.7	38.7
Properties under capital leases	1.7	1.7
Building
Property, Plant and Equipment [Line Items]
Property, gross	303.5	285.2
Properties under capital leases	16.5	16.5
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, gross	$ 1,038.0	$ 966.3