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Fair Value Measurements - Changes in Level 3 Liabilities (Detail) - Visa Conversion Rate Swap - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 29.7 $ 25.2
Total (Gains) Losses:    
Included in Earnings 19.8 12.7
Purchases, Issues, Sales, and Settlements    
Settlements (16.7) (8.2)
Balance at end of period 32.8 29.7
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at December 31 $ 13.3 $ 11.4