Derivatives - Schedule of Fair Value of Derivatives Designated and Not Designated as Hedges (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
Derivatives Fair Value [Line Items]
Derivatives assets	$ 1.7	$ 1.8
Not Designated as Hedging Instrument | Accrued Liabilities
Derivatives Fair Value [Line Items]
Derivatives liabilities	1.5	1.5
Designated Fair Value Hedges | Other Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivatives assets	$ 0.0	$ 0.4