Property, Plant and Equipment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 645.2	$ 528.0
Less: accumulated depreciation		(366.7)	(329.6)
Property, plant and equipment, net	[1]	278.5	198.4
Computer software included in net property, plant and equipment		42.1	34.7
Amortization of software costs		7.1	7.0	$ 6.1
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment		28.0	18.9
Building and improvements to leaseholds
Property, Plant and Equipment [Line Items]
Property, plant and equipment		152.6	119.1
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment		453.5	382.0
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 11.1	$ 8.0

[1] Net property, plant and equipment as of December 31, 2017 and 2016 contained $42.1 million and $34.7 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Amortization expense for software was $7.1 million, $7.0 million and $6.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.