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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Land $ 13.4 $ 13.4
Buildings and improvements 422.8 420.6
Machinery and equipment 1,399.2 1,387.4
Construction in progress 17.1 30.4
Subtotal 1,852.5 1,851.8
Less allowances for depreciation (1,160.6) (1,145.1)
Property, Plant and Equipment, net $ 691.9 $ 706.7