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
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Gross Amounts of Recognized Assets $ 1.6 $ 5.8
Gross Amounts Offset in the Balance Sheet, Derivative Assets (1.6) (4.3)
Net Amounts of Assets Presented in the Balance Sheet   1.5
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 1.6 5.8
Gross Amounts Offset in the Balance Sheet, Derivative Assets $ (1.6) (4.3)
Net Amounts of Assets Presented in the Balance Sheet   $ 1.5