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Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets $ 205.3 $ 246.1
Derivative payables (44.4) (50.2)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 139.9 115.9
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 65.4 130.2
Derivative payables $ (44.4) $ (50.2)