Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 808.1	$ 791.2
Less accumulated depreciation	504.7	510.4
Net	303.4	280.8
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17.5	17.0
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	59.9	58.2
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 730.7	$ 716.0