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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities: |  |  |
Net income | $ 706.1 | $ 641.8 | $ 621.0
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization expense | 219.3 | 215.2 | 218.4
Impairment of long-lived assets | 1.2 | 37.0 | 4.2
Provision for uncollectible accounts | 3.4 | 7.4 | 6.7
Deferred income tax provision (benefit) | 32.5 | (9.1) | (192.6)
Gain on sales of property, plant and equipment | (1.0) | (18.8) | (9.5)
Stock-based compensation expense | 51.2 | 45.5 | 33.4
Other | 9.5 | 12.3 | 7.7
Changes in operating assets and liabilities (excluding effect of businesses acquired): |  |  |
Accounts receivable | 178.1 | (153.3) | (126.4)
Inventories | 211.8 | (88.8) | (186.6)
Prepaid expenses and other assets | 31.9 | (14.0) | (11.5)
Accounts payable and other liabilities | (142.5) | (10.6) | 34.2
Net cash provided by operating activities | 1,301.5 | 664.6 | 399.0
Investing activities: |  |  |
Purchases of property, plant and equipment | (242.2) | (239.9) | (161.6)
Acquisitions, net of cash acquired | (177.8) | (77.6) | (37.8)
Proceeds from sales of property, plant and equipment | 8.0 | 29.2 | 27.6
Other | (7.1) | 7.3 | (7.6)
Net cash used in investing activities | (419.1) | (281.0) | (179.4)
Financing activities: |  |  |
Net short-term debt (repayments) borrowings | (0.3) | (48.4) | 8.4
Proceeds from long-term debt borrowings | 971.0 | 1,518.7 | 875.0
Principal payments on long-term debt | (1,588.6) | (1,192.2) | (915.3)
Dividends and dividend equivalents paid | (151.3) | (145.3) | (132.0)
Share repurchases | (50.0) | (484.9) | (25.0)
Noncontrolling interests purchased | (0.4) | (29.0) |
Other | (21.0) | (22.8) | (9.2)
Net cash used in financing activities | (840.6) | (403.9) | (198.1)
Effect of exchange rate changes on cash and cash equivalents | 4.3 | (5.9) | 10.1
Increase (decrease) in cash and cash equivalents | 46.1 | (26.2) | 31.6
Cash and cash equivalents at beginning of year | 128.2 | 154.4 | 122.8
Cash and cash equivalents at end of year | 174.3 | 128.2 | 154.4
Supplemental cash flow information: |  |  |
Interest paid during the year | 83.0 | 84.0 | 72.5
Income taxes paid during the year, net | $ 214.3 | 228.5 | $ 171.1
Non-cash investing and financing activities: |  |  |
Debt assumed in connection with acquisitions |  | $ 25.9 |

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