Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets related to:
Inventories	$ 62.6	$ 52.6
Valuation and other reserves	22.3	22.4
Net operating loss carryforwards	10.5	11.0
Accumulated other comprehensive loss	85.2	84.2	$ 80.1
Lease liability	114.7
Other items, net	2.9	3.0
Gross deferred tax assets	298.2	173.2
Valuation allowance on deferred tax assets	(9.0)	(8.6)
Total net deferred tax assets	289.2	164.6
Deferred tax liabilities related to:
Property, plant and equipment	(700.8)	(478.3)
Goodwill and other intangibles	(151.7)	(170.6)
Right-of-use assets	(112.1)
Partnerships and joint ventures	(27.4)	(204.3)
Employee benefits	(30.2)	(17.0)
Total deferred tax liabilities	(1,022.2)	(870.2)
Deferred income taxes, net	$ (733.0)	$ (705.6)