Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Offsetting of Derivative Assets (Detail)

v3.8.0.1
Fair Value Measurements - Offsetting of Derivative Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Gross Amounts of Recognized Assets $ 1.9 $ 7.4
Gross Amounts Offset in the Balance Sheet, Derivative Assets (1.6) (3.0)
Net Amounts of Assets Presented in the Balance Sheet 0.3 4.4
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 1.9 7.4
Gross Amounts Offset in the Balance Sheet, Derivative Assets (1.6) (3.0)
Net Amounts of Assets Presented in the Balance Sheet $ 0.3 $ 4.4