Income Taxes - Components of Deferred Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Inventory	$ 246.8	$ 260.3
Net operating loss carryover	165.1	181.3
Tax credit carryover	163.8	110.4
Capital loss carryover	6.9	2.3
Accrued liabilities	102.5	182.2
Share-based compensation	26.8	60.3
Accounts receivable	17.3	22.3
Other	84.9	101.9
Total deferred tax assets	814.1	921.0
Less: Valuation allowances	(140.6)	(88.3)
Total deferred tax assets after valuation allowances	673.5	832.7
Deferred tax liabilities:
Fixed assets	85.6	138.7
Intangible assets	1,423.0	2,343.7
Unremitted earnings of foreign subsidiaries		1,159.4
Other	18.2
Total deferred tax liabilities	1,526.8	3,641.8
Total net deferred income taxes	$ (853.3)	$ (2,809.1)