Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Offsetting of Derivative Assets (Detail)

v3.10.0.1
Fair Value Measurements - Offsetting of Derivative Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Gross Amounts of Recognized Assets $ 5.7 $ 5.8
Gross Amounts Offset in the Balance Sheet, Derivative Assets (2.5) (4.3)
Net Amounts of Assets Presented in the Balance Sheet 3.2 1.5
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 5.7 5.8
Gross Amounts Offset in the Balance Sheet, Derivative Assets (2.5) (4.3)
Net Amounts of Assets Presented in the Balance Sheet $ 3.2 $ 1.5