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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 846.6 | $ 825.7 | $ 821.3
Adjustments required to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation of property and equipment | 18.9 | 16.7 | 16.4
Amortization of premium and accretion of discount on marketable securities, net | 9.4 | 2.0 | 13.6
Realized loss (gain) on sale of marketable securities, net | (4.5) | (0.7) | 1.8
Amortization of intangible assets | 8.2 | 7.3 | 4.4
Stock-based compensation | 112.5 | 106.7 | 89.3
Deferred income tax expense | 10.5 | 9.5 | 16.8
Increase in trade receivables, net | (45.0) | (0.4) | (21.8)
Decrease in prepaid expenses and other assets | 20.2 | 15.5 | 2.0
Increase (decrease) in trade payables | 1.6 | (4.8) | 6.6
Increase in employees and payroll accruals | 36.1 | 39.8 | 20.1
Increase in income tax accrual and accrued expenses and other liabilities | 46.1 | 34.6 | 28.3
Increase in deferred revenues | 95.2 | 48.7 | 145.0
Other | 5.2 | 3.7 | (0.2)
Net cash provided by operating activities | 1,161.0 | 1,104.3 | 1,143.6
Cash flows from investing activities: |  |  |
Proceeds from short-term bank deposits |  | 4.9 |
Proceeds from maturity of marketable securities | 2,299.7 | 2,140.1 | 1,464.4
Proceeds from sale of marketable securities | 318.6 | 167.4 | 150.2
Investment in marketable securities | (2,460.2) | (2,188.9) | (1,767.5)
Investment in short-term bank deposits | (213.9) |  | (5.0)
Cash paid in conjunction with acquisitions, net of acquired cash | (23.1) | (37.6) | (154.9)
Purchase of property and equipment | (19.3) | (25.9) | (17.2)
Net cash provided by (used in) investing activities | (98.2) | 60.0 | (330.0)
Cash flows from financing activities: |  |  |
Proceeds from issuance of treasury shares upon exercise of options | 216.8 | 95.3 | 353.6
Purchase of treasury shares at cost | (1,297.7) | (1,278.0) | (1,103.9)
Payments related to shares withheld for taxes | (5.4) | (6.0) | (4.7)
Net cash used in financing activities | (1,086.3) | (1,188.7) | (755.0)
Increase (decrease) in cash and cash equivalents | (23.5) | (24.4) | 58.6
Cash and cash equivalents at the beginning of the year | 279.2 | 303.6 | 245.0
Cash and cash equivalents at the end of the year | 255.7 | 279.2 | 303.6
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for taxes on income | 90.8 | 87.3 | 67.9
Non-cash investing activity |  |  |
Fair value of awards attributable to pre-acquisition services | 0.2 | 0.5 | $ 2.2
Operating lease liabilities arising from obtaining right of use assets | $ 10.3 | $ 33.4 |

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