Income Taxes - Schedule of Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accruals not currently deductible for tax purposes	$ 147.5	$ 173.0
Inventory	31.6	34.6
Postretirement liabilities	28.0	24.0
Pension liabilities	53.6	49.4
Net operating losses	355.1	374.0
Foreign tax credits	133.3	7.5
Other	123.9	137.3
Total gross deferred tax assets	873.0	799.8
Less valuation allowance	(195.0)	(293.0)
Net deferred tax assets after valuation allowance	678.0	506.8
Deferred tax liabilities:
Accelerated depreciation	(87.2)	(59.0)
Amortizable intangibles	(1,405.4)	(2,801.6)
Outside basis differences	(13.1)	(18.3)
Other	(49.0)	(35.6)
Total gross deferred tax liabilities	(1,554.7)	(2,914.5)
Net deferred tax liabilities	$ (876.7)	$ (2,407.7)