Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating activities:
Net income	$ 451,722	$ 440,093
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	101,499	99,841
Stock-based compensation expense	93,195	90,247
Deferred taxes	(40,934)	3,091
Loss on impairment of lease related assets	591	527
Reduction in the carrying amount of operating lease right-of-use assets	34,738	32,167
Amortization and write-off of deferred financing fees	2,075	2,548
Gain on de-designated swaps	(446)	(5,038)
Changes in assets and liabilities, net of acquisitions and divestitures:
Fees receivable, net	475,125	172,907
Deferred commissions	86,927	55,063
Prepaid expenses and other current assets	(19,869)	(22,525)
Other assets	(20,651)	(28,533)
Deferred revenues	(154,358)	15,935
Accounts payable and accrued and other liabilities	(312,537)	(297,523)
Cash provided by operating activities	697,077	558,800
Investing activities:
Additions to property, equipment and leasehold improvements	(61,817)	(52,027)
Acquisition of business	0	(2,000)
Cash used in investing activities	(61,817)	(54,027)
Financing activities:
Proceeds from employee stock purchase plan	17,467	14,460
Payments of deferred financing fees	0	(2,972)
Proceeds from revolving credit facility	0	274,400
Payments on long-term debt	0	(274,400)
Purchases of treasury stock	(437,155)	(564,717)
Cash used in financing activities	(419,688)	(553,229)
Net increase (decrease) in cash and cash equivalents and restricted cash	215,572	(48,456)
Effects of exchange rates on cash and cash equivalents	48,817	(35,358)
Cash and cash equivalents and restricted cash, beginning of period	1,933,147	1,319,599
Cash and cash equivalents, end of period	$ 2,197,536	$ 1,235,785