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Revenue - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | $ 1,128,949 | $ 1,207,448 | $ 996,763
Non-Topic 606 revenues | 430,920 | 516,243 | 495,876
Total revenues | 1,559,869 | 1,723,691 | 1,492,639
Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 500,975 | 558,718 | 561,744
Non-Topic 606 revenues | 417,335 | 479,677 | 413,396
Total revenues | 918,310 | 1,038,395 | 975,140
Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 273,630 | 350,018 | 245,457
Non-Topic 606 revenues | 4,210 | 17,808 | 57,887
Total revenues | 277,840 | 367,826 | 303,344
Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 354,344 | 298,712 | 189,562
Non-Topic 606 revenues | 9,375 | 18,758 | 24,593
Total revenues | 363,719 | 317,470 | 214,155
Payment processing revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 698,891 | 825,592 | 723,991
Total revenues | 698,891 | 825,592 | 723,991
Payment processing revenue | Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 404,843 | 457,244 | 464,980
Total revenues | 404,843 | 457,244 | 464,980
Payment processing revenue | Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 229,144 | 303,385 | 203,289
Total revenues | 229,144 | 303,385 | 203,289
Payment processing revenue | Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 64,904 | 64,963 | 55,722
Total revenues | 64,904 | 64,963 | 55,722
Account servicing revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 313,145 | 266,526 | 175,819
Total revenues | 449,456 | 413,552 | 308,096
Account servicing revenue | Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 17,512 | 17,709 | 30,385
Total revenues | 153,823 | 164,735 | 162,662
Account servicing revenue | Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 41,927 | 43,293 | 37,262
Total revenues | 41,927 | 43,293 | 37,262
Account servicing revenue | Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 253,706 | 205,524 | 108,172
Total revenues | 253,706 | 205,524 | 108,172
Other revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 116,913 | 115,330 | 96,953
Total revenues | 212,999 | 237,229 | 251,925
Other revenue | Fleet Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 78,620 | 83,765 | 66,379
Total revenues | 162,337 | 171,334 | 156,970
Other revenue | Travel and Corporate Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 2,559 | 3,340 | 4,906
Total revenues | 5,690 | 19,062 | 61,402
Other revenue | Health and Employee Benefit Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Topic 606 revenues | 35,734 | 28,225 | 25,668
Total revenues | $ 44,972 | $ 46,833 | $ 33,553

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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=120311839&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=120311839&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=120311839&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=120311839&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=120311839&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=121604090&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=120311839&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=120311839&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=120311839&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=121604090&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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