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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net income $ 845.7 $ 840.3 $ 796.9
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 24.0 23.1 22.7
Amortization of premium and accretion of discount on marketable securities, net (6.4) 3.1 18.5
Realized loss on sale of marketable securities, net 0.0 6.7 0.0
Amortization of intangible assets 59.6 24.3 13.5
Stock-based compensation 149.7 145.3 131.4
Deferred taxes (12.1) (9.5) (0.5)
Increase in trade receivables, net (65.9) (9.9) (46.1)
Decrease (increase) in prepaid expenses and other assets (13.0) (51.1) 0.1
Increase in trade payables 5.4 17.9 19.8
Increase (decrease) in employees and payroll accruals (2.4) 26.7 26.3
Decrease in income tax accrual and accrued expenses and other liabilities (12.0) (0.9) (54.6)
Increase in deferred revenues 79.5 21.8 170.3
Other 0.3 0.1 0.2
Net cash provided by operating activities 1,052.4 1,037.9 1,098.5
Cash flows from investing activities:      
Proceeds from short-term bank deposits 157.0 510.6 538.4
Proceeds from maturity of marketable securities 1,084.4 1,022.9 1,056.6
Proceeds from sale of marketable securities 22.3 491.9 9.1
Investment in marketable securities (839.2) (947.3) (1,063.1)
Investment in short-term bank deposits (238.5) (132.0) (477.0)
Cash paid in conjunction with acquisitions, net of acquired cash (185.8) (458.8) (48.3)
Purchase of property and equipment (24.2) (18.6) (22.1)
Net cash provided by (used in) investing activities (24.0) 468.7 (6.4)
Cash flows from financing activities:      
Proceeds from issuance of treasury shares upon exercise of options 258.6 133.7 141.2
Purchase of treasury shares at cost (1,299.9) (1,287.6) (1,299.9)
Payments related to shares withheld for taxes (18.6) (11.0) (9.3)
Net cash used in financing activities (1,059.9) (1,164.9) (1,168.0)
Increase (decrease) in cash and cash equivalents (31.5) 341.7 (75.9)
Cash and cash equivalents at the beginning of the year 537.7 196.0 271.9
Cash and cash equivalents at the end of the year 506.2 537.7 196.0
Supplemental disclosure of cash flow information:      
Cash paid during the year for taxes on income 122.5 118.7 113.5
Non-cash investing activity      
Fair value of awards attributable to pre-acquisition services 3.1 1.3 0.0
Operating lease liabilities arising from obtaining right of use assets $ 12.3 $ 2.3 $ 8.0