Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets:
Asbestos	$ 209.8	$ 228.7
Loss carryforwards	112.3	125.1
Employee benefits	98.9	110.4
Accruals	74.8	88.0
Credit carryforwards	50.7	34.5
Other	21.2	15.5
Gross deferred tax assets	567.7	602.2
Less: Valuation allowance	113.3	135.7	$ 147.1	$ 135.3
Net deferred tax assets	454.4	466.5
Deferred Tax Liabilities:
Intangibles	(68.3)	(70.8)
Undistributed earnings	(52.3)	(39.6)
Accelerated depreciation	(36.5)	(31.0)
Investment	(0.4)	(0.5)
Total deferred tax liabilities	(157.5)	(141.9)
Net deferred tax assets	$ 296.9	$ 324.6