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, 2018
Dec. 31, 2017
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities $ 3.9 $ 6.6
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities (1.6) (4.3)
Net Amounts of Liabilities Presented in the Balance Sheet 2.3 2.3
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities 3.9 6.6
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities (1.6) (4.3)
Net Amounts of Liabilities Presented in the Balance Sheet $ 2.3 $ 2.3