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Changes in Level 3 Liabilities (Detail) - Visa Conversion Rate Swap - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value at January 1 $ 10.8 $ 0.0
Total Losses:    
Included in Earnings 4.4 0.8
Purchases, Issuances, Sales, and Settlements:    
Issuance 14.9 11.3
Settlements (4.9) (1.3)
Fair Value at December 31 25.2 10.8
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at December 31 $ 4.4 $ 0.7