Income Taxes - Components of Net Deferred Tax Assets Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Compensation and benefits	$ 22.1	$ 56.1
Defined benefit plans	43.7	82.5
Capitalized inventories	11.1	13.6
Accounts receivable	7.8	10.3
Other accrued expenses	45.6	41.4
Net operating loss and other tax carryforwards	25.6	39.7
Valuation allowance	(11.0)	(16.4)
Miscellaneous	3.7	2.5
Total deferred tax assets	148.6	229.7
Deferred tax liabilities:
LIFO inventories	(4.2)	(6.7)
Fixed assets	(44.5)	(57.1)
Intangible assets	(232.0)	(210.4)
Investment in partnership	(9.2)	(109.3)
Miscellaneous	(16.1)	(0.2)
Total deferred tax liabilities	(306.0)	(383.7)
Net deferred tax liability	(157.4)	(154.0)
Other assets	9.4	9.5
Deferred income taxes	(166.8)	(163.5)
Net deferred tax liability	$ (157.4)	$ (154.0)