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Summary of Significant Accounting Policies Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt obligations, carrying amount $ 31,100.0  
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 206.3 $ 167.9
Derivative payables 16.6 45.4
Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 167.1 167.3
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt obligations, fair value 31,700.0  
Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 39.2 0.6
Derivative payables $ 16.6 $ 45.4