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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 825.7 | $ 821.3 | $ 802.9
Adjustments required to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation of property and equipment | 16.7 | 16.4 | 12.9
Amortization of premium and accretion of discount on marketable securities, net | 2.0 | 13.6 | 20.0
Realized loss (gain) on sale of marketable securities, net | (0.7) | 1.8 | 0.2
Amortization of intangible assets | 7.3 | 4.4 | 3.8
Stock-based compensation | 106.7 | 89.3 | 87.4
Deferred income tax expense | 9.5 | 16.8 | 64.6
Decrease (increase) in trade receivables, net | (0.4) | (21.8) | 6.3
Decrease in prepaid expenses and other assets | 15.5 | 2.0 | 5.6
Increase (decrease) in trade payables | (4.8) | 6.6 | (7.8)
Increase (decrease) in employees and payroll accruals | 39.8 | 20.1 | (4.5)
Increase (decrease) in income tax accrual and accrued expenses and other liabilities | 34.6 | 28.3 | (3.5)
Increase in deferred revenues | 48.7 | 145.0 | 121.0
Other | 3.7 | (0.2) | 0.7
Net cash provided by operating activities | 1,104.3 | 1,143.6 | 1,109.6
Cash flows from investing activities: |  |  |
Proceeds from maturity of marketable securities | 2,140.1 | 1,464.4 | 1,363.7
Proceeds from sale of marketable securities | 167.4 | 150.2 | 66.1
Proceeds from short-term bank deposits | 4.9 |  | 106.6
Investment in marketable securities | (2,188.9) | (1,767.5) | (1,686.4)
Investment in short-term bank deposits |  | (5.0) |
Cash paid in conjunction with acquisitions, net of acquired cash | (37.6) | (154.9) |
Purchase of property and equipment | (25.9) | (17.2) | (28.8)
Net cash provided by (used in) investing activities | 60.0 | (330.0) | (178.8)
Cash flows from financing activities: |  |  |
Proceeds from issuance of treasury shares upon exercise of options | 95.3 | 353.6 | 127.5
Purchase of treasury shares at cost | (1,278.0) | (1,103.9) | (995.3)
Payments related to shares withheld for taxes | (6.0) | (4.7) | (5.4)
Net cash used in financing activities | (1,188.7) | (755.0) | (873.2)
Increase (decrease) in cash and cash equivalents | (24.4) | 58.6 | 57.6
Cash and cash equivalents at the beginning of the year | 303.6 | 245.0 | 187.4
Cash and cash equivalents at the end of the year | 279.2 | 303.6 | 245.0
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for taxes on income | 87.3 | 67.9 | $ 143.0
Non-cash investing activity |  |  |
Fair value of awards attributable to pre-acquisition services | 0.5 | $ 2.2 |
Right-of-use asset recognized with corresponding lease liability | $ 33.4 |  |

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