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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 55.0 $ 36.0
Adjustments to reconcile net income to net cash provided from operating activities:    
Depreciation and amortization 78.8 55.6
Deferred income taxes and investment tax credits, net 7.3 20.4
Equity in earnings of unconsolidated affiliates (33.9) (35.6)
Distributions from unconsolidated affiliates 33.9 35.3
Allowance for equity funds used during construction (7.0) (6.9)
Stock-based compensation 2.7 2.1
Regulatory assets 0.2 (6.4)
Regulatory liabilities 2.6 (4.6)
Other assets 0.6 (4.0)
Other liabilities 0.9 6.2
Change in certain current assets and liabilities:    
Accounts receivable and accrued unbilled revenues, net 14.8 36.6
Fuel, materials and supplies inventories (12.2) (7.7)
Fuel recoveries 48.2 (22.1)
Other current assets 8.3 4.3
Accounts payable (23.7) 24.9
Other current liabilities (9.5) (43.1)
Net cash provided from operating activities 167.0 91.0
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (less allowance for equity funds used during construction) (137.4) (219.9)
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) (1.6) 0.0
Return of capital - unconsolidated affiliates 1.4 0.0
Net cash used in investing activities (137.6) (219.9)
CASH FLOWS FROM FINANCING ACTIVITIES    
Dividends paid on common stock (66.6) (60.4)
Proceeds from long-term debt 0.0 297.1
Excess tax benefit on stock-based compensation (0.4) 0.0
Payment of long-term debt 0.0 (0.1)
Increase (decrease) in short-term debt 25.5 (108.0)
Net cash (used in) provided from financing activities (41.5) 128.6
NET CHANGE IN CASH AND CASH EQUIVALENTS (12.1) (0.3)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 14.4 0.3
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 2.3 $ 0.0