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
Jun. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities $ 2.8 $ 5.4
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities (2.8) (5.4)
Net Amounts of Liabilities Presented in the Balance Sheet   0.0
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities 2.8 5.4
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities $ (2.8) (5.4)
Net Amounts of Liabilities Presented in the Balance Sheet   $ 0.0