Commitments and Contingencies - Summary of Net Asbestos Charges (Detail) (Asbestos Related Matters [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asbestos Related Contingencies [Line Items]
Net asbestos charge	$ 3.9	$ 32.8	$ 45.8
Continuing Operations [Member]
Asbestos Related Contingencies [Line Items]
Asbestos provision	64.9	63.3	53.8
Asbestos remeasurement, net	(58.8)	0.5	2.9
Settlement Agreement	(2.2)	(31.0)	(5.8)
Net asbestos charge	3.9	32.8	50.9
Discontinued Operations [Member]
Asbestos Related Contingencies [Line Items]
Asbestos provision	0	0	0.5
Settlement Agreement	0		(5.6)
Net asbestos charge	$ 0	$ 0	$ (5.1)