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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 619.0 $ 338.2 $ 271.3
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 283.5 322.6 307.9
Deferred income taxes and investment tax credits, net (50.0) 153.8 102.6
Equity in earnings of unconsolidated affiliates (131.2) (101.8) (15.5)
Distributions from unconsolidated affiliates 131.2 102.3 94.1
Allowance for equity funds used during construction (39.7) (14.2) (8.3)
Stock-based compensation 9.1 4.7 7.6
Regulatory assets 3.7 (21.4) (9.1)
Regulatory liabilities (3.7) (11.8) (27.5)
Other assets (0.7) 15.4 10.4
Other liabilities (65.5) (18.9) 8.6
Change in certain current assets and liabilities:      
Accounts receivable and accrued unbilled revenues, net (21.8) (6.9) 21.6
Income taxes receivable 13.6 (2.2) (1.2)
Fuel, materials and supplies inventories (3.6) 32.4 (56.5)
Fuel recoveries 53.0 (112.6) 129.6
Other current assets 27.2 (26.2) (17.2)
Accounts payable 27.1 (45.1) 30.9
Other current liabilities (66.7) 36.4 17.8
Net cash provided from operating activities 784.5 644.7 867.1
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (824.1) (660.1) (547.8)
Return of capital - equity method investments 10.0 38.8 45.2
Proceeds from sale of assets 0.7 0.9 2.5
Investment in unconsolidated affiliates (8.5) 0.0 0.0
Net cash used in investing activities (821.9) (620.4) (500.1)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from long-term debt 592.1 0.0 0.0
Issuance (expense) of common stock (0.1) 0.0 7.2
Dividends paid on common stock (247.6) (225.1) (204.6)
Other 0.0 (0.1) (1.7)
Payment of long-term debt (225.1) (110.2) (0.2)
(Decrease) increase in short-term debt (67.8) 236.2 (98.0)
Net cash provided from (used in) financing activities 51.5 (99.2) (297.3)
NET CHANGE IN CASH AND CASH EQUIVALENTS 14.1 (74.9) 69.7
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 0.3 75.2 5.5
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 14.4 $ 0.3 $ 75.2