Income Taxes - Components of Net Deferred Income Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Inventories, Assets		$ 1.7
Lease assets	$ 5.0	6.4
Accrued OPEB costs, Assets	2.3	2.4
Accrued pension costs, Assets	73.6	100.0
Other accrued liabilities and deductible differences, Assets	12.1	11.7
Tax loss and tax credit carryforwards, Assets	78.1	86.9
Valuation allowance, Assets	(7.4)	(4.4)
Adjusted gross deferred tax assets	163.7	204.7
Netting by tax jurisdiction, Assets	(56.9)	(53.7)
Net noncurrent deferred tax asset	106.8	151.0
Inventories, Liabilities	(2.9)
Property and equipment, Liabilities	(62.5)	(58.4)
Lease liabilities	(5.1)	(6.5)
Other taxable differences, Liabilities	(3.3)	(1.4)
Tax on unremitted earnings of non-U.S. subsidiaries, Liabilities	(11.2)	(12.0)
Adjusted gross deferred tax liabilities	(85.0)	(78.3)
Netting by tax jurisdiction, Liabilities	56.9	53.7
Net noncurrent deferred tax liability	$ (28.1)	$ (24.6)