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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Net income $ 796.9 $ 815.6 $ 846.6
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 22.7 20.6 18.9
Amortization of premium and accretion of discount on marketable securities, net 18.5 21.0 9.4
Realized loss (gain) on sale of marketable securities, net 0.0 (1.4) (4.5)
Amortization of intangible assets 13.5 10.1 8.2
Stock-based compensation 131.4 120.3 112.5
Deferred income tax expense (benefit) (0.5) (4.0) 10.5
Increase in trade receivables, net (46.1) (51.6) (45.0)
Decrease in prepaid expenses and other assets 0.1 1.2 20.2
Increase (decrease) in trade payables 19.8 (7.7) 1.6
Increase (decrease) in employees and payroll accruals 26.3 (8.9) 36.1
Increase (decrease) in income tax accrual and accrued expenses and other liabilities (54.6) 66.4 46.1
Increase in deferred revenues 170.3 216.8 95.2
Other 0.2 5.5 5.2
Net cash provided by operating activities 1,098.5 1,203.9 1,161.0
Cash flows from investing activities:      
Proceeds from short-term bank deposits 538.4 214.5 0.0
Proceeds from maturity of marketable securities 1,056.6 1,551.7 2,299.7
Proceeds from sale of marketable securities 9.1 184.1 318.6
Investment in marketable securities (1,063.1) (1,297.5) (2,460.2)
Investment in short-term bank deposits (477.0) (492.5) (213.9)
Cash paid in conjunction with acquisitions, net of acquired cash (48.3) (219.7) (23.1)
Purchase of property and equipment (22.1) (15.9) (19.3)
Net cash used in investing activities (6.4) (75.3) (98.2)
Cash flows from financing activities:      
Proceeds from issuance of treasury shares upon exercise of options 141.2 194.0 216.8
Purchase of treasury shares at cost (1,299.9) (1,299.5) (1,297.7)
Payments related to shares withheld for taxes (9.3) (6.9) (5.4)
Net cash used in financing activities (1,168.0) (1,112.4) (1,086.3)
Increase (decrease) in cash and cash equivalents (75.9) 16.2 (23.5)
Cash and cash equivalents at the beginning of the year 271.9 255.7 279.2
Cash and cash equivalents at the end of the year 196.0 271.9 255.7
Supplemental disclosure of cash flow information:      
Cash paid during the year for taxes on income 113.5 101.0 90.8
Non-cash investing activity      
Fair value of awards attributable to pre-acquisition services 0.0 1.8 0.2
Operating lease liabilities arising from obtaining right of use assets $ 8.0 $ 1.4 $ 10.3