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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 31.3 $ 16.2  
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 78.8 54.7  
Deferred income taxes and investment tax credits, net 11.3 7.5  
Allowance for equity funds used during construction (7.0) (6.9)  
Stock-based compensation expense 1.0 0.8  
Regulatory assets 0.2 (6.4)  
Regulatory liabilities 2.6 (4.6)  
Other assets 0.3 (3.1)  
Other liabilities 1.4 0.7  
Change in certain current assets and liabilities:      
Accounts receivable and accrued unbilled revenues, net 19.7 40.1  
Fuel, materials and supplies inventories (12.2) (7.7)  
Fuel recoveries 48.2 (22.1)  
Other current assets 8.3 0.7  
Accounts payable (19.8) 26.4  
Income taxes payable - parent (8.4) 5.6  
Other current liabilities (9.9) (37.5)  
Net cash provided from operating activities 145.8 64.4  
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (137.4) (219.9)  
Net cash used in investing activities (137.4) (219.9)  
CASH FLOWS FROM FINANCING ACTIVITIES      
Dividends paid on common stock 0.0 (65.0)  
Proceeds from long-term debt 0.0 297.1  
Payment of long-term debt 0.0 (0.1)  
Changes in advances with parent (8.4) (76.5)  
Net cash (used in) provided from financing activities (8.4) 155.5  
NET CHANGE IN CASH AND CASH EQUIVALENTS 0.0 0.0  
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 0.0 0.0 $ 0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 0.0 $ 0.0 $ 0.0