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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 815.6 $ 846.6 $ 825.7
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 20.6 18.9 16.7
Amortization of premium and accretion of discount on marketable securities, net 21.0 9.4 2.0
Realized loss (gain) on sale of marketable securities, net (1.4) (4.5) (0.7)
Amortization of intangible assets 10.1 8.2 7.3
Stock-based compensation 120.3 112.5 106.7
Deferred income tax expense (4.0) 10.5 9.5
Increase in trade receivables, net (51.6) (45.0) (0.4)
Decrease in prepaid expenses and other assets 1.2 20.2 15.5
Increase (decrease) in trade payables (7.7) 1.6 (4.8)
Increase in employees and payroll accruals (8.9) 36.1 39.8
Increase in income tax accrual and accrued expenses and other liabilities 66.4 46.1 34.6
Increase in deferred revenues 216.8 95.2 48.7
Other 5.5 5.2 3.7
Net cash provided by operating activities 1,203.9 1,161.0 1,104.3
Cash flows from investing activities:      
Proceeds from short-term bank deposits 214.5 0.0 4.9
Proceeds from maturity of marketable securities 1,551.7 2,299.7 2,140.1
Proceeds from sale of marketable securities 184.1 318.6 167.4
Investment in marketable securities (1,297.5) (2,460.2) (2,188.9)
Investment in short-term bank deposits (492.5) (213.9) 0.0
Cash paid in conjunction with acquisitions, net of acquired cash (219.7) (23.1) (37.6)
Purchase of property and equipment (15.9) (19.3) (25.9)
Net cash provided by (used in) investing activities (75.3) (98.2) 60.0
Cash flows from financing activities:      
Proceeds from issuance of treasury shares upon exercise of options 194.0 216.8 95.3
Purchase of treasury shares at cost (1,299.5) (1,297.7) (1,278.0)
Payments related to shares withheld for taxes (6.9) (5.4) (6.0)
Net cash used in financing activities (1,112.4) (1,086.3) (1,188.7)
Increase (decrease) in cash and cash equivalents 16.2 (23.5) (24.4)
Cash and cash equivalents at the beginning of the year 255.7 279.2 303.6
Cash and cash equivalents at the end of the year 271.9 255.7 279.2
Supplemental disclosure of cash flow information:      
Cash paid during the year for taxes on income 101.0 90.8 87.3
Non-cash investing activity      
Fair value of awards attributable to pre-acquisition services 1.8 0.2 0.5
Operating lease liabilities arising from obtaining right of use assets $ 1.4 $ 10.3 $ 33.4