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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Operating Activities |  |
Net income | $ 772.0 | $ 745.5
Reconciliation to cash provided by operating activities |  |
Depreciation and amortization | 593.5 | 581.5
Deferred income taxes and investment tax credits, net | 444.4 | 439.5
Contributions and payments related to pension and OPEB plans | (115.4) | (23.5)
Equity income in transmission affiliate, net of distributions | (18.5) | (35.8)
Change in - |  |
Accounts receivable and unbilled revenues | 310.5 | 185.2
Materials, supplies, and inventories | (84.1) | 33.8
Other current assets | 57.9 | 88.5
Accounts payable | (111.2) | (94.7)
Other current liabilities | 23.4 | (92.9)
Other, net | (125.8) | (105.2)
Net cash provided by operating activities | 1,746.7 | 1,721.9
Investing Activities |  |
Capital expenditures | (1,309.2) | (1,000.1)
Acquisition of Bluewater | (226.0) | 0.0
Capital contributions to transmission affiliate | (63.3) | (27.1)
Proceeds from the sale of assets and businesses | 22.7 | 161.2
Withdrawal of restricted cash from rabbi trust for qualifying payments | 18.7 | 23.8
Other, net | 5.1 | 0.6
Net cash used in investing activities | (1,552.0) | (841.6)
Financing Activities |  |
Exercise of stock options | 25.6 | 40.4
Purchase of common stock | (60.6) | (105.6)
Dividends paid on common stock | (492.4) | (468.6)
Issuance of long-term debt | 210.0 | 200.0
Retirement of long-term debt | (26.9) | (253.5)
Change in short-term debt | 133.3 | (305.6)
Other, net | (3.1) | (12.2)
Net cash used in financing activities | (214.1) | (905.1)
Net change in cash and cash equivalents | (19.4) | (24.8)
Cash and cash equivalents at beginning of period | 37.5 | 49.8
Cash and cash equivalents at end of period | $ 18.1 | $ 25.0

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