Income Taxes - Components of Deferred Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Inventory	$ 295.6	$ 271.5
Net operating loss carryover	514.4	374.3
Tax credit carryover	33.8	29.2
Capital loss carryover	8.3	7.9
Product liability and litigation	40.4	92.6
Accrued liabilities	45.5	35.3
Share-based compensation	28.6	27.3
Accounts receivable	24.6	15.2
Other	79.0	48.8
Total deferred tax assets	1,070.2	902.1
Less: Valuation allowances	(546.1)	(390.9)
Total deferred tax assets after valuation allowances	524.1	511.2
Deferred tax liabilities:
Fixed assets	77.6	94.4
Intangible assets	772.3	1,301.3
Other	42.9	14.1
Total deferred tax liabilities	892.8	1,409.8
Total net deferred income taxes	$ (368.7)	$ (898.6)