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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