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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