XML 98 R78.htm IDEA: XBRL DOCUMENT v3.20.4
Fair Value Measurements - Changes in Level 3 Liabilities (Detail) - Visa Conversion Rate Swap - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 33.4 $ 32.8
Total (Gains) Losses:    
Included in Earnings 18.3 17.1
Purchases, Issues, Sales, and Settlements    
Settlements (16.4) (16.5)
Balance at end of period 35.3 33.4
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at December 31 $ 18.6 $ 12.3