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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 338.2 $ 271.3 $ 395.8
Adjustments to reconcile net income to net cash provided from operating activities      
Depreciation and amortization 322.6 307.9 281.4
Deferred income taxes and investment tax credits 153.8 102.6 177.3
Equity in earnings of unconsolidated affiliates (101.8) (15.5) [1] (172.6)
Distributions from unconsolidated affiliates 102.3 94.1 143.7
Allowance for equity funds used during construction (14.2) (8.3) (4.2)
Stock-based compensation 4.6 5.9 (2.7)
Regulatory assets (21.4) (9.1) 4.5
Regulatory liabilities (11.8) (27.5) (4.4)
Other assets 15.4 10.4 (16.5)
Other liabilities (18.9) 8.6 29.6
Change in certain current assets and liabilities      
Accounts receivable, net 0.1 15.7 (9.4)
Accounts receivable - unconsolidated affiliates (0.8) 3.9 6.8
Accrued unbilled revenues (6.2) 2.0 3.2
Income taxes receivable (2.2) (1.2) (10.4)
Fuel, materials and supplies inventories 32.4 (56.5) 20.4
Fuel clause under recoveries (51.3) 68.3 (42.1)
Other current assets (26.2) (17.2) (2.6)
Accounts payable (45.1) 30.9 (64.0)
Fuel clause over recoveries (61.3) 61.3 (0.4)
Other current liabilities 36.4 17.8 (11.8)
Net Cash Provided from Operating Activities 644.6 865.4 721.6
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (660.1) (547.8) (569.3)
Return of capital - equity method investments 38.8 45.2 9.5
Proceeds from sale of assets 0.9 2.5 0.7
Net Cash Used in Investing Activities (620.4) (500.1) (559.1)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from long-term debt 0.0 0.0 588.9
Issuance of common stock 0.0 7.2 13.2
Dividends paid on common stock (225.1) (204.6) (184.1)
Payment of long-term debt (110.2) (0.2) (240.2)
Increase (decrease) in short-term debt 236.2 (98.0) (341.6)
Net cash used in financing activities (99.1) (295.6) (163.8)
NET CHANGE IN CASH AND CASH EQUIVALENTS (74.9) 69.7 (1.3)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 75.2 5.5 6.8
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 0.3 $ 75.2 $ 5.5
[1] In 2015, The Company recorded a $108.4 million pre-tax charge during the third quarter of 2015 for its share of the goodwill impairment, as adjusted for the basis difference. See Note 3 for further discussion of Enable's goodwill impairment.