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
Mar. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Gross Amounts of Recognized Assets $ 2.4 $ 5.8
Gross Amounts Offset in the Balance Sheet, Derivative Assets (1.5) (4.3)
Net Amounts of Assets Presented in the Balance Sheet 0.9 1.5
Foreign exchange currency contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 2.4 5.8
Gross Amounts Offset in the Balance Sheet, Derivative Assets (1.5) (4.3)
Net Amounts of Assets Presented in the Balance Sheet $ 0.9 $ 1.5