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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Activities |  |  |
Net earnings | $ 296.5 | $ 326.5 | $ 282.9
Adjustments to reconcile earnings to cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 70.1 | 65.1 | 63.0
U.S. Tax Reform income tax expense | 81.8 |  |
Pension (income) expense | (9.1) | (6.9) | 0.1
Stock based compensation expense | 9.9 | 9.4 | 8.8
Net changes in operating assets and liabilities, net of acquisitions: |  |  |
Current assets and liabilities | (127.8) | 68.5 | 16.8
Noncurrent assets and liabilities | 5.0 | (16.0) | (19.9)
Cash Provided by Operating Activities | 326.4 | 446.6 | 351.7
Investing Activities |  |  |
Acquisitions of businesses | (43.1) | (90.8) |
Investments in marketable securities | (583.5) | (563.8) | (428.8)
Proceeds from sales of marketable securities | 562.7 | 435.1 | 315.4
Capital expenditures | (94.2) | (80.7) | (72.7)
Cash Used in Investing Activities | (158.1) | (300.2) | (186.1)
Financing Activities |  |  |
Long-term debt incurred | 86.5 | 74.1 | 28.1
Common stock repurchases | (139.1) | (135.2) | (128.1)
Net (payments) proceeds from stock option activity | (0.9) | 5.7 | 6.4
Acquisition related contingent payment | (1.7) |  |
Dividends paid | (96.9) | (84.2) | (67.8)
Cash Used in Financing Activities | (152.1) | (139.6) | (161.4)
Net increase in cash and cash equivalents | 16.2 | 6.8 | 4.2
Cash and cash equivalents-beginning of year | 330.4 | 323.6 | 319.4
Cash and Cash Equivalents-End of Year | $ 346.6 | $ 330.4 | $ 323.6

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