Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Offsetting of Derivative Liabilities (Detail)

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Fair Value Measurements - Offsetting of Derivative Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities $ 6.6 $ 3.5
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities (1.6) (3.0)
Net Amounts of Liabilities Presented in the Balance Sheet 5.0 0.5
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities 6.6 3.5
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities (1.6) (3.0)
Net Amounts of Liabilities Presented in the Balance Sheet $ 5.0 $ 0.5