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Financial Instruments - Valuation of Financial Instruments Recorded on Fair Value Basis (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Noncurrent marketable securities $ 4.0 $ 2.4
Fair Value Measurements Recurring    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Currency forward contracts 0.5 (1.2)
Interest rate swap contract (8.1) (3.5)
Noncurrent marketable securities 4.0 2.4
Fair Value Measurements Recurring | Level 1    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Currency forward contracts 0.5 (1.2)
Noncurrent marketable securities 4.0 2.4
Fair Value Measurements Recurring | Level 2    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Interest rate swap contract $ (8.1) $ (3.5)