Income Taxes - Components of Deferred Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Inventory	$ 271.5	$ 246.8
Net operating loss carryover	374.3	165.1
Tax credit carryover	29.2	163.8
Capital loss carryover	7.9	6.9
Product liability and litigation	92.6	55.9
Accrued liabilities	35.3	46.6
Share-based compensation	27.3	26.8
Accounts receivable	15.2	17.3
Other	48.8	84.9
Total deferred tax assets	902.1	814.1
Less: Valuation allowances	(390.9)	(140.6)
Total deferred tax assets after valuation allowances	511.2	673.5
Deferred tax liabilities:
Fixed assets	94.4	85.6
Intangible assets	1,301.3	1,423.0
Other	14.1	18.2
Total deferred tax liabilities	1,409.8	1,526.8
Total net deferred income taxes	$ (898.6)	$ (853.3)