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Condensed Consolidated Financial Statements - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Jul. 31, 2019 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Feb. 26, 2024 | Aug. 21, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Amount of off balance sheet settlement funds |  |  | $ 201,700 |  | $ 201,700 |  | $ 267,000 |  |
Goodwill |  |  | 1,226,026 |  | 1,226,026 |  | 1,226,026 |  |
Proceeds from sale of equity investment |  |  |  |  | 46,021 | $ 0 |  |  |
Gain on sale of equity investment |  |  | 0 | $ 0 | 25,927 | $ 0 |  |  |
India Payment Technology and Services Company |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire investment interest |  | $ 18,300 |  |  |  |  |  |  |
Percentage of voting interests acquired |  | 30.00% |  |  |  |  |  |  |
Percentage of interest sold in equity investment | 0.30 |  |  |  |  |  |  |  |
Proceeds from sale of equity investment | $ 46,000 |  |  |  |  |  |  |  |
Gain on sale of equity investment | $ 25,900 |  |  |  |  |  |  |  |
India Payment Technology and Services Company | Other Noncurrent Assets |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, amount recorded |  |  |  |  |  |  | $ 18,600 |  |
Payment Software |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  | 809,000 |  | 809,000 |  |  |  |
Biller |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 417,000 |  | $ 417,000 |  |  |  |
5.750% Senior notes, due August 2026 | Senior Notes |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 5.75% |  | 5.75% |  |  | 5.75% | 5.75%
5.750% Senior notes, due August 2026 | Level 2 | Senior Notes |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 5.75% |  |
Fair value of long-term debt |  |  |  |  |  |  | $ 399,200 |  |

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