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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Operating Activities |  |
Net income | $ 390.4 | $ 356.9
Reconciliation to cash provided by operating activities |  |
Depreciation and amortization | 208.6 | 194.6
Deferred income taxes and investment tax credits, net | 17.0 | 150.2
Contributions and payments related to pension and OPEB plans | (5.3) | (106.0)
Equity income in transmission affiliates, net of distributions | 7.1 | (6.7)
Change in - |  |
Accounts receivable and unbilled revenues | (60.1) | 55.0
Materials, supplies, and inventories | 163.0 | 170.5
Other current assets | 81.3 | 41.2
Accounts payable | (170.9) | (212.7)
Other current liabilities | 128.6 | 90.8
Other, net | 134.3 | (19.2)
Net cash provided by operating activities | 894.0 | 714.6
Investing Activities |  |
Capital expenditures | (439.6) | (329.7)
Capital contributions to transmission affiliates | (12.8) | (27.6)
Proceeds from the sale of assets and businesses | 0.8 | 13.1
Proceeds from the sale of investments held in rabbi trust | 16.5 | 8.6
Other, net | (0.7) | 2.5
Net cash used in investing activities | (435.8) | (333.1)
Financing Activities |  |
Exercise of stock options | 2.1 | 5.9
Purchase of common stock | (15.8) | (20.2)
Dividends paid on common stock | (174.2) | (164.1)
Retirement of long-term debt | (12.6) | (12.0)
Change in short-term debt | (244.3) | (189.8)
Other, net | (0.3) | (0.6)
Net cash used in financing activities | (445.1) | (380.8)
Net change in cash, cash equivalents, and restricted cash | 13.1 | 0.7
Cash, cash equivalents, and restricted cash at beginning of period | 58.6 | 72.7
Cash, cash equivalents, and restricted cash at end of period | $ 71.7 | $ 73.4

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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