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Legal Proceedings - 10-K (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 31, 2019 | Nov. 30, 2015 | Apr. 30, 2015 | Mar. 31, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Document Period End Date |  |  | Dec. 31, 2020 |  |  |  |  |
Legal Reserve | Maximum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued |  |  | $ 100.0 |  |  |  |  |
Interchange Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement Amount |  | $ 900.0 | 6,600.0 |  |  |  |  |
Payments for Legal Settlements |  | 5,300.0 | $ 700.0 |  |  |  |  |
Conditional Return of Legal Settlements Paid Maximum Amount |  | $ 700.0 |  |  |  |  |  |
Litigation Settlement, Trigger Percent of Opt Out by Class Members for Return of Portion of Settlement Payments |  | 15.00% | 15.00% |  |  |  |  |
Interchange Litigation | Visa |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement Amount |  | $ 600.0 |  |  |  |  |  |
Payments for Legal Settlements |  |  | $ 467.0 |  |  |  |  |
Conditional Return of Legal Settlements Paid Maximum Amount |  | $ 467.0 |  |  |  |  |  |
Jo Ann Howard Pc Et Al V Cassity Et Al |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Alleged Present And Future Losses |  |  | $ 600.0 |  |  |  |  |
Compensatory damages |  |  |  |  |  |  |  | $ 356.0
Punitive damages |  |  |  |  |  |  |  | $ 36.0
Prejudgement interests |  |  |  |  |  |  | $ 179.0 |
Reduced Compensatory Damages |  |  |  |  |  | $ 289.0 |  |
Jo Ann Howard Pc Et Al V Cassity Et Al | Pending Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Compensatory damages |  |  |  |  | $ 72.0 |  |  |
Punitive damages |  |  |  |  | 15.0 |  |  |
Loss contingency, damages awarded, interest, value |  |  |  |  | $ 15.0 |  |  |
Increase (decrease) in damages awarded |  |  |  | $ 2.6 |  |  |  |
Loss contingency, damages awarded, value |  |  |  | $ 99.5 |  |  |  |
Loss contingency, damages sought, value | $ 7.0 |  |  |  |  |  |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD. + References No definition available. + Details
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