Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets:
Loss carryforwards	$ 139.8	$ 157.0
Asbestos	101.5	108.7
Employee benefits	59.4	64.9
Accruals	46.0	47.7
Other	23.0	24.7
Gross deferred tax assets	369.7	403.0
Less: Valuation allowance	129.8	141.0	$ 170.0	$ 113.3
Net deferred tax assets	239.9	262.0
Deferred Tax Liabilities:
Intangibles	(43.0)	(43.5)
Undistributed earnings	(33.8)	(28.2)
Accelerated depreciation	(26.9)	(27.2)
Investment	(0.2)	(0.2)
Total deferred tax liabilities	(103.9)	(99.1)
Net deferred tax assets	$ 136.0	$ 162.9