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Financial Instruments and Hedging Activities (Fair Values of Derivative Instruments Included on Consolidated Balance Sheet) (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value $ 163.6 $ 181.3
Liability Derivatives Fair Value (54.7) (5.6)
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 11.0 36.9
Liability Derivatives Fair Value (42.7) (3.7)
Derivatives Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 152.6 144.4
Liability Derivatives Fair Value $ (12.0) $ (1.9)