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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

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