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Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Abstract]    
Land $ 53.0 $ 56.1
Buildings 399.1 417.3
Machinery and equipment 1,832.3 1,885.2
Property, plant and equipment, gross 2,284.4 2,358.6
Less: Accumulated depreciation (1,738.7) (1,743.5)
Total property, plant and equipment-net $ 545.7 $ 615.1