Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Gross Amounts of Recognized Assets $ 5.8 $ 7.4
Gross Amounts Offset in the Balance Sheet, Derivative Assets (4.3) (3.0)
Net Amounts of Assets Presented in the Balance Sheet 1.5 4.4
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 5.8 7.4
Gross Amounts Offset in the Balance Sheet, Derivative Assets (4.3) (3.0)
Net Amounts of Assets Presented in the Balance Sheet $ 1.5 $ 4.4