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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Cash flows from operating activities: |  |
Net income | $ 121.5 | $ 99.7
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 50.2 | 50.6
Amortization | 1.6 | 1.3
Stock-based compensation | 13.4 | 9.4
Non-cash restructuring charges | 0.4 | 0.4
Contingent consideration payments in excess of acquisition-date liability | (0.3) | (0.5)
Other non-cash items, net | (1.3) | (3.4)
Changes in assets and liabilities | (32.8) | (30.5)
Net cash provided by operating activities | 152.7 | 127.0
Cash flows from investing activities: |  |
Capital expenditures | (57.1) | (48.2)
Acquisition of business | (18.9) | 0.0
Other, net | 0.2 | 2.5
Net cash used in investing activities | (75.8) | (45.7)
Cash flows from financing activities: |  |
Borrowings under revolving credit agreements | 28.0 | 0.0
Repayments under revolving credit agreements | (28.0) | 0.0
Debt issuance costs | (0.9) | 0.0
Dividend payments | (22.2) | (20.7)
Proceeds from stock-based compensation awards | 16.2 | 6.5
Employee stock purchase plan contributions | 2.6 | 2.4
Shares purchased under share repurchase programs | (83.1) | (70.8)
Net cash used in financing activities | (87.4) | (82.6)
Effect of exchange rates on cash | (0.2) | (9.1)
Net decrease in cash and cash equivalents | (10.7) | (10.4)
Cash and cash equivalents at beginning of period | 337.4 | 235.9
Cash and cash equivalents at end of period | $ 326.7 | $ 225.5

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