Commitments and Contingencies - Roll forward of Asbestos Liability and Related Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Changes in estimate during the period:
Asbestos-related liability	$ 76.8	$ 88.0
Asbestos-related current assets	66.0	74.5
Noncurrent portion	877.5	954.8
Noncurrent Asbestos Related Assets	314.6	337.5
Asbestos Related Matters [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Net Balance, Beginning	630.8	746.8
Changes in estimate during the period:
Continuing operations	(59.0)	(63.0)
Asbestos remeasurement	(81.8)	(44.8)
Settlement Agreement	2.1	(8.9)
Change in Defense Cost Estimate for Asbestos Matters	4.9	100.7
Net cash activity	(31.5)	(24.6)
Balance, Ending		630.8
Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties	573.7	630.8
Asbestos Related Matters [Member] | Liability [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning	1,042.8	1,223.2
Changes in estimate during the period:
Continuing operations	(68.8)	(73.3)
Asbestos remeasurement	(75.9)	(52.7)
Settlement Agreement	0.0
Change in Defense Cost Estimate for Asbestos Matters	4.9	124.2
Net cash activity	(76.5)	(76.8)
Balance, Ending	954.3	1,042.8
Noncurrent portion		954.8
Asbestos Related Matters [Member] | Asset [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning	412.0	476.4
Changes in estimate during the period:
Continuing operations	9.8	10.3
Asbestos remeasurement	(5.9)	7.9
Settlement Agreement	2.1	(8.9)
Change in Defense Cost Estimate for Asbestos Matters	0.0	(23.5)
Net cash activity	45.0	52.2
Balance, Ending	$ 380.6	$ 412.0