Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Land	$ 53.1	$ 56.1
Buildings	403.1	417.3
Machinery and equipment	1,844.5	1,885.2
Property, plant and equipment, gross	2,300.7	2,358.6
Less: Accumulated depreciation	(1,741.5)	(1,743.5)
Total property, plant and equipment-net	$ 559.2	$ 615.1