Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Land	$ 53.6	$ 56.1
Buildings	414.5	417.3
Machinery and equipment	1,899.5	1,885.2
Property, plant and equipment, gross	2,367.6	2,358.6
Less: Accumulated depreciation	(1,778.9)	(1,743.5)
Total property, plant and equipment-net	$ 588.7	$ 615.1