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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Operating Activities |  |
Net income | $ 556.3 | $ 528.2
Reconciliation to cash provided by operating activities |  |
Depreciation and amortization | 392.3 | 386.0
Deferred income taxes and investment tax credits, net | 274.6 | 307.1
Contributions and payments related to pension and OPEB plans | (111.5) | (19.5)
Equity income in transmission affiliate, net of distributions | (14.5) | (22.7)
Change in - |  |
Accounts receivable and unbilled revenues | 247.3 | 130.1
Materials, supplies, and inventories | 77.9 | 193.5
Other current assets | 15.6 | 66.7
Accounts payable | (114.0) | (112.4)
Other current liabilities | 18.3 | (139.0)
Other, net | (74.3) | (93.9)
Net cash provided by operating activities | 1,268.0 | 1,224.1
Investing Activities |  |
Capital expenditures | (790.0) | (618.7)
Acquisition of Bluewater | (226.0) | 0.0
Capital contributions to transmission affiliate | (50.5) | (12.1)
Proceeds from the sale of assets and businesses | 20.7 | 161.0
Withdrawal of restricted cash from Rabbi trust for qualifying payments | 17.2 | 22.5
Other, net | 4.7 | (1.8)
Net cash used in investing activities | (1,023.9) | (449.1)
Financing Activities |  |
Exercise of stock options | 15.6 | 35.0
Purchase of common stock | (39.7) | (94.2)
Dividends paid on common stock | (328.3) | (312.4)
Issuance of long-term debt | 210.0 | 0.0
Retirement of long-term debt | (14.6) | (241.8)
Change in short-term debt | (85.4) | (167.2)
Other, net | (2.7) | (12.1)
Net cash used in financing activities | (245.1) | (792.7)
Net change in cash and cash equivalents | (1.0) | (17.7)
Cash and cash equivalents at beginning of period | 37.5 | 49.8
Cash and cash equivalents at end of period | $ 36.5 | $ 32.1

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