Financial Instruments - Pretax Amounts Related to Derivative Contracts that were Recognized in and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - Designated as hedging instrument - Cash flow hedging - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gains (losses) recognized in accumulated other comprehensive loss	$ 35.8	$ 28.8	$ (96.8)
Comprehensive income (loss)	16.5	38.3	(10.1)
Foreign currency contracts
Derivative [Line Items]
Gains (losses) recognized in accumulated other comprehensive loss	50.5	28.8	(96.8)
Foreign currency contract (gains) losses reclassified from accumulated other comprehensive loss to	(19.3)	9.5	86.7
Foreign currency contracts | Net sales
Derivative [Line Items]
Foreign currency contract (gains) losses reclassified from accumulated other comprehensive loss to	2.3	2.1	4.8
Foreign currency contracts | Cost of sales
Derivative [Line Items]
Foreign currency contract (gains) losses reclassified from accumulated other comprehensive loss to	(21.6)	7.4	81.9
Interest rate swap contracts
Derivative [Line Items]
Gains (losses) recognized in accumulated other comprehensive loss	$ (14.7)	$ 0.0	$ 0.0