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Revenues - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | $ 351,285 | $ 277,542 | $ 990,119 | $ 844,790
Non-Topic 606 revenues | 131,479 | 104,574 | 362,885 | 316,089
Total revenues | 482,764 | 382,116 | 1,353,004 | 1,160,879
Fleet Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 155,839 | 127,632 | 444,238 | 378,831
Non-Topic 606 revenues | 130,522 | 101,072 | 360,348 | 304,100
Total revenues | 286,361 | 228,704 | 804,586 | 682,931
Travel and Corporate Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 90,087 | 63,732 | 240,982 | 199,623
Non-Topic 606 revenues | 915 | 564 | 2,424 | 3,527
Total revenues | 91,002 | 64,296 | 243,406 | 203,150
Health and Employee Benefit Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 105,359 | 86,178 | 304,899 | 266,336
Non-Topic 606 revenues | 42 | 2,938 | 113 | 8,462
Total revenues | 105,401 | 89,116 | 305,012 | 274,798
Payment processing revenue |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 226,126 | 171,077 | 627,941 | 522,575
Total revenues | 226,126 | 171,077 | 627,941 | 522,575
Payment processing revenue | Fleet Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 130,006 | 102,418 | 367,032 | 305,888
Total revenues | 130,006 | 102,418 | 367,032 | 305,888
Payment processing revenue | Travel and Corporate Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 79,815 | 53,239 | 205,345 | 166,768
Total revenues | 79,815 | 53,239 | 205,345 | 166,768
Payment processing revenue | Health and Employee Benefit Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 16,305 | 15,420 | 55,564 | 49,919
Total revenues | 16,305 | 15,420 | 55,564 | 49,919
Account servicing revenue |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 98,510 | 77,503 | 276,551 | 233,630
Total revenues | 137,724 | 112,417 | 389,344 | 335,736
Account servicing revenue | Fleet Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 4,457 | 4,436 | 13,162 | 13,146
Total revenues | 43,671 | 39,350 | 125,955 | 115,252
Account servicing revenue | Travel and Corporate Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 10,908 | 9,964 | 32,817 | 31,210
Total revenues | 10,908 | 9,964 | 32,817 | 31,210
Account servicing revenue | Health and Employee Benefit Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 83,145 | 63,103 | 230,572 | 189,274
Total revenues | 83,145 | 63,103 | 230,572 | 189,274
Other revenue |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 26,649 | 28,962 | 85,627 | 88,585
Total revenues | 51,145 | 52,315 | 156,298 | 157,623
Other revenue | Fleet Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 21,376 | 20,778 | 64,044 | 59,797
Total revenues | 45,155 | 40,807 | 132,972 | 117,857
Other revenue | Travel and Corporate Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | (636) | 529 | 2,820 | 1,645
Total revenues | 79 | 948 | 4,551 | 4,272
Other revenue | Health and Employee Benefit Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total Topic 606 revenues | 5,909 | 7,655 | 18,763 | 27,143
Total revenues | $ 5,911 | $ 10,560 | $ 18,775 | $ 35,494

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