Derivatives and Financial Instruments - Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	$ 5.5	$ 0.1
Foreign currency contract liabilities	(5.4)	(7.6)
Deferred compensation plan assets	47.9	50.8
Derivative Assets (Liabilities), at Fair Value, Net	48.0	43.3
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.0	0.0
Foreign currency contract liabilities	0.0	0.0
Deferred compensation plan assets	41.6	43.8
Derivative Assets (Liabilities), at Fair Value, Net	41.6	43.8
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	5.5	0.1
Foreign currency contract liabilities	(5.4)	(7.6)
Deferred compensation plan assets	6.3	7.0
Derivative Assets (Liabilities), at Fair Value, Net	6.4	(0.5)
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.0	0.0
Foreign currency contract liabilities	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Derivative Assets (Liabilities), at Fair Value, Net	$ 0.0	$ 0.0