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Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt obligations, carrying amount $ 29,500.0  
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 167.9 $ 181.3
Derivative payables 45.4 5.6
Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 167.3 134.3
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt obligations, fair value 31,800.0  
Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0.6 47.0
Derivative payables $ 45.4 $ 5.6