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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) segment shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Product Information [Line Items] |  |  |  |
Number of reportable segments | segment |  | 2 |  |
Cash available for general purposes |  | $ 703,300 | $ 713,000 |
Allowance for credit losses |  | 19,000 | 21,000 |
Allowance for credit losses held for sale |  |  | 3,300 |
Credit loss expense related to accounts receivable |  | 23,300 | 15,000 | $ 12,800
Allowance for credit losses related to settlement processing assets |  | 9,700 | 2,300 |
Credit loss expense related to settlement processing assets |  | 19,200 | 13,000 | 3,600
Impairment of goodwill |  | 0 | 833,075 | $ 0
Equity method investments |  | $ 989,600 | $ 957,200 |
Antidilutive securities excluded from computation of earnings per share (shares) | shares |  | 191,353 | 700,119 | 234,813
Notes Receivable |  |  |  |
Product Information [Line Items] |  |  |  |
Allowance for credit losses and a noncash charge |  | $ 15,200 |  |
Allowance for credit losses |  | $ 15,200 |  |
Cash and Cash Equivalents | Financial Institution Concentration Risk | Eight Financial Institutions |  |  |  |
Product Information [Line Items] |  |  |  |
Percentage of total consolidated revenues from external customers |  | 75.00% |  |
CUP Data |  |  |  |
Product Information [Line Items] |  |  |  |
Ownership interest in equity method investment (as a percent) |  | 45.00% |  |
Held-for-sale | Consumer Business |  |  |  |
Product Information [Line Items] |  |  |  |
Impairment of goodwill | $ 833,100 |  |  |
Minimum |  |  |  |
Product Information [Line Items] |  |  |  |
Amortization period of capitalized contract costs |  | 3 years |  |
Maximum |  |  |  |
Product Information [Line Items] |  |  |  |
Amortization period of capitalized contract costs |  | 7 years |  |
Internal-Use Software |  |  |  |
Product Information [Line Items] |  |  |  |
Capitalized implementation costs, net of accumulated amortization |  | $ 206,500 | $ 142,900 |
Amortization expense of capitalized implementation costs |  | $ 3,800 | $ 3,100 | $ 3,000
Internal-Use Software | Minimum |  |  |  |
Product Information [Line Items] |  |  |  |
Estimated useful life |  | 5 years |  |
Internal-Use Software | Maximum |  |  |  |
Product Information [Line Items] |  |  |  |
Estimated useful life |  | 10 years |  |

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