Segment Information - Revenue by Product Category, Net of Intercompany Balances (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Revenue	$ 2,585.3	$ 2,405.4	$ 2,485.6
Pumps and complementary products
Revenue from External Customer [Line Items]
Revenue	718.8	745.1	1,025.9
Pump support and maintenance services
Revenue from External Customer [Line Items]
Revenue	88.4	84.7	87.8
Brake component products
Revenue from External Customer [Line Items]
Revenue	979.7	873.4	656.7
Shock absorber equipment
Revenue from External Customer [Line Items]
Revenue	196.0	109.6	110.2
Connectors
Revenue from External Customer [Line Items]
Revenue	317.9	309.1	327.9
Aerospace control components
Revenue from External Customer [Line Items]
Revenue	223.1	220.8	210.7
Industrial control components
Revenue from External Customer [Line Items]
Revenue	$ 61.4	$ 62.7	$ 66.4