Summary of Properties and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Land	$ 0.2	$ 0.2
Buildings and improvements	26.0	24.7
Machinery and equipment	118.0	120.3
Total property and equipment, at cost	144.2	145.2
Less: Accumulated depreciation	101.3	100.2
Properties and equipment, net	$ 42.9	$ 45.0