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Revenue - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | $ 1,345,809 | $ 1,128,949 | $ 1,207,448
Non-Topic 606 revenues | 504,733 | 430,920 | 516,243
Total revenues | 1,850,542 | 1,559,869 | 1,723,691
Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 612,527 | 500,975 | 558,718
Non-Topic 606 revenues | 498,888 | 417,335 | 479,677
Total revenues | 1,111,415 | 918,310 | 1,038,395
Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 321,877 | 273,630 | 350,018
Non-Topic 606 revenues | 3,041 | 4,210 | 17,808
Total revenues | 324,918 | 277,840 | 367,826
Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 411,405 | 354,344 | 298,712
Non-Topic 606 revenues | 2,804 | 9,375 | 18,758
Total revenues | 414,209 | 363,719 | 317,470
Payment processing revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 858,990 | 698,891 | 825,592
Total revenues | 858,990 | 698,891 | 825,592
Payment processing revenue | Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 513,365 | 404,843 | 457,244
Total revenues | 513,365 | 404,843 | 457,244
Payment processing revenue | Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 274,092 | 229,144 | 303,385
Total revenues | 274,092 | 229,144 | 303,385
Payment processing revenue | Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 71,533 | 64,904 | 64,963
Total revenues | 71,533 | 64,904 | 64,963
Account servicing revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 376,139 | 313,145 | 266,526
Total revenues | 526,858 | 449,456 | 413,552
Account servicing revenue | Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 17,631 | 17,512 | 17,709
Total revenues | 168,350 | 153,823 | 164,735
Account servicing revenue | Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 44,157 | 41,927 | 43,293
Total revenues | 44,157 | 41,927 | 43,293
Account servicing revenue | Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 314,351 | 253,706 | 205,524
Total revenues | 314,351 | 253,706 | 205,524
Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 110,680 | 116,913 | 115,330
Total revenues | 209,371 | 212,999 | 237,229
Other revenue | Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 81,531 | 78,620 | 83,765
Total revenues | 175,394 | 162,337 | 171,334
Other revenue | Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 3,628 | 2,559 | 3,340
Total revenues | 5,796 | 5,690 | 19,062
Other revenue | Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 25,521 | 35,734 | 28,225
Total revenues | $ 28,181 | $ 44,972 | $ 46,833

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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