Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets:
Loss carryforwards	$ 157.0	$ 165.5
Asbestos	108.7	118.7
Employee benefits	64.9	70.8
Accruals	47.7	51.3
Credit carryforwards	2.2	5.7
Other	22.5	23.1
Gross deferred tax assets	403.0	435.1
Less: Valuation allowance	141.0	170.0	$ 113.3	$ 135.7
Net deferred tax assets	262.0	265.1
Deferred Tax Liabilities:
Intangibles	(43.5)	(45.4)
Undistributed earnings	(28.2)	(39.0)
Accelerated depreciation	(27.2)	(31.8)
Investment	(0.2)	(0.2)
Total deferred tax liabilities	(99.1)	(116.4)
Net deferred tax assets	$ 162.9	$ 148.7