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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Amortizable intangibles [Line Items]
Gross carrying amount	$ 1,128,226		$ 1,128,226		$ 1,166,934
Accumulated amortization	(790,413)		(790,413)		(775,190)
Net carrying amount	337,813		337,813		391,744
Amortization of intangibles	38,626	$ 34,941	111,690	$ 110,017
Estimated future amortization expense
Remainder of 2024	32,230		32,230
2025	101,851		101,851
2026	72,200		72,200
2027	43,530		43,530
2028	27,115		27,115
Internal-use software [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	596,355		596,355		554,825
Accumulated amortization	(453,331)		(453,331)		(412,364)
Net carrying amount	143,024		143,024		142,461
Acquired intangibles			$ 56,163
Acquired intangibles, weighted-average useful life (in years)			3 years
Customer lists/relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	345,208		$ 345,208		363,298
Accumulated amortization	(247,963)		(247,963)		(235,557)
Net carrying amount	97,245		97,245		127,741
Partner relationships [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	75,396		75,396		74,911
Accumulated amortization	(17,660)		(17,660)		(14,031)
Net carrying amount	57,736		57,736		60,880
Technology-based intangibles [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	65,700		65,700		97,633
Accumulated amortization	(27,783)		(27,783)		(54,251)
Net carrying amount	37,917		37,917		43,382
Trade names [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	39,367		39,367		39,367
Accumulated amortization	(38,716)		(38,716)		(23,792)
Net carrying amount	651		651		15,575
Trade names [Member] \| Modification of useful life [Member]
Amortizable intangibles [Line Items]
Amortization of intangibles	6,674		13,349
Software to be sold [Member]
Amortizable intangibles [Line Items]
Gross carrying amount	6,200		6,200		36,900
Accumulated amortization	(4,960)		(4,960)		(35,195)
Net carrying amount	$ 1,240		$ 1,240		$ 1,705