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Property, Plant, and Equipment (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Abstract]    
Land $ 69.7 $ 69.8
Buildings and improvements 452.5 454.6
Machinery and equipment 1,323.3 1,310.2
Construction in progress 100.2 93.8
Total 1,945.7 1,928.4
Less accumulated depreciation (675.3) (634.0)
Property, plant, and equipment, net $ 1,270.4 $ 1,294.4