Commitments and Contingencies - Roll forward of Asbestos Liability and Related Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in estimate during the period:
Asbestos-related liability	$ 88.0	$ 106.6
Asbestos-related current assets	74.5	102.4
Noncurrent portion	954.8	1,116.6
Noncurrent Asbestos Related Assets	337.5	374.0
Asbestos Related Matters [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Net Balance, Beginning	746.8	746.9
Changes in estimate during the period:
Continuing operations	(82.5)	6.1
Settlement Agreement	(8.9)	(2.2)	$ (31.0)
Net cash activity	(24.6)	(4.0)
Balance, Ending		746.8	$ 746.9
Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties	630.8	746.8
Asbestos Related Matters [Member] | Liability [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning	1,223.2	1,264.7
Changes in estimate during the period:
Continuing operations	(103.6)	32.4
Settlement Agreement	0.0
Net cash activity	(76.8)	(73.9)
Balance, Ending	1,042.8	1,223.2
Noncurrent portion		1,116.6
Asbestos Related Matters [Member] | Asset [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning	476.4	517.8
Changes in estimate during the period:
Continuing operations	21.1	(26.3)
Settlement Agreement	(8.9)
Net cash activity	52.2	69.9
Balance, Ending	$ 412.0	$ 476.4