Commitments and Contingencies - Summary of Net Asbestos Charges (Detail) - Asbestos Related Matters [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Asbestos Related Contingencies [Line Items]
Asbestos provision	$ 59.0	$ 63.0
Asbestos remeasurement, net	(81.8)	(44.8)
Change in Defense Cost Estimate for Asbestos Matters	4.9	100.7
Settlement Agreement	(2.1)	8.9
Continuing Operations [Member]
Asbestos Related Contingencies [Line Items]
Asbestos provision	59.0	63.0	$ 64.9
Asbestos remeasurement, net	(81.8)	(44.8)	(58.8)
Change in Defense Cost Estimate for Asbestos Matters	(4.9)	(100.7)	0.0
Settlement Agreement	2.1	(8.9)	(2.2)
Net asbestos charge	$ (25.6)	$ (91.4)	$ 3.9