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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Amortizable intangibles [Line Items] |  |  |  |  |
Gross carrying amount | $ 1,030,452 |  | $ 1,030,452 |  | $ 947,870
Accumulated amortization | (697,431) |  | (697,431) |  | (616,817)
Net carrying amount | 333,021 |  | 333,021 |  | 331,053
Amortization of intangibles | 26,641 | $ 38,626 | 84,216 | $ 111,690 |
Estimated future amortization expense |  |  |  |  |
Remainder of 2025 | 27,027 |  | 27,027 |  |
2026 | 81,861 |  | 81,861 |  |
2027 | 53,680 |  | 53,680 |  |
2028 | 32,329 |  | 32,329 |  |
2029 | 19,021 |  | 19,021 |  |
Internal-use software [Member] |  |  |  |  |
Amortizable intangibles [Line Items] |  |  |  |  |
Gross carrying amount | 549,266 |  | 549,266 |  | 488,840
Accumulated amortization | (389,246) |  | (389,246) |  | (339,683)
Net carrying amount | 160,020 |  | 160,020 |  | 149,157
Acquired intangibles |  |  | $ 59,450 |  |
Acquired intangibles, weighted-average useful life (in years) |  |  | 3 years |  |
Customer lists/relationships [Member] |  |  |  |  |
Amortizable intangibles [Line Items] |  |  |  |  |
Gross carrying amount | 319,586 |  | $ 319,586 |  | 311,578
Accumulated amortization | (244,551) |  | (244,551) |  | (223,272)
Net carrying amount | 75,035 |  | 75,035 |  | 88,306
Partner relationships [Member] |  |  |  |  |
Amortizable intangibles [Line Items] |  |  |  |  |
Gross carrying amount | 76,300 |  | 76,300 |  | 76,252
Accumulated amortization | (22,621) |  | (22,621) |  | (19,632)
Net carrying amount | 53,679 |  | 53,679 |  | 56,620
Technology-based intangibles [Member] |  |  |  |  |
Amortizable intangibles [Line Items] |  |  |  |  |
Gross carrying amount | 65,000 |  | 65,000 |  | 65,000
Accumulated amortization | (35,208) |  | (35,208) |  | (29,115)
Net carrying amount | 29,792 |  | 29,792 |  | 35,885
Trade Names [Member] | Modification of useful life [Member] |  |  |  |  |
Amortizable intangibles [Line Items] |  |  |  |  |
Amortization of intangibles |  | $ 6,674 |  | $ 13,349 |
Other [Member] |  |  |  |  |
Amortizable intangibles [Line Items] |  |  |  |  |
Gross carrying amount | 20,300 |  | 20,300 |  | 6,200
Accumulated amortization | (5,805) |  | (5,805) |  | (5,115)
Net carrying amount | $ 14,495 |  | $ 14,495 |  | $ 1,085

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