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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Revenue [Abstract]        
Contracts with Customers – Utility $ 257.8 $ 264.9 $ 528.0 $ 546.5
Contracts with Customers – Non-utility 80.4 82.5 162.4 160.6
Other – Non-utility 5.9 5.9 11.9 11.8
Total Operating Revenue 344.1 353.3 702.3 718.9
Operating Expenses [Abstract]        
Fuel, Purchased Power and Gas – Utility 96.5 93.1 197.4 189.7
Transmission Services – Utility 16.8 17.6 35.2 34.2
Cost of Sales – Non-utility 37.0 38.4 69.9 69.9
Operating and Maintenance 86.8 85.9 173.3 170.3
Depreciation and Amortization 56.1 50.1 101.9 100.6
Taxes Other than Income Taxes 14.4 14.2 30.7 28.6
Total Operating Expenses 307.6 299.3 608.4 593.3
Operating Income 36.5 54.0 93.9 125.6
Other Income (Expense) [Abstract]        
Interest Expense (17.1) (16.7) (34.0) (33.9)
Equity Earnings in ATC 4.3 5.3 9.0 11.4
Other 2.2 1.6 4.3 3.2
Total Other Expense (10.6) (9.8) (20.7) (19.3)
Income Before Income Taxes 25.9 44.2 73.2 106.3
Income Tax Expense (Benefit) (5.4) 7.3 (9.1) 20.4
Net Income $ 31.3 $ 36.9 $ 82.3 $ 85.9
Average Shares of Common Stock [Abstract]        
Basic (Shares) 51.3 50.9 51.2 50.5
Diluted (Shares) 51.5 51.1 51.4 50.7
Basic Earnings Per Share of Common Stock $ 0.61 $ 0.73 $ 1.61 $ 1.70
Diluted Earnings Per Share of Common Stock 0.61 0.72 1.60 1.69
Dividends Per Share of Common Stock $ 0.56 $ 0.535 $ 1.12 $ 1.07