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Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Operating Revenue | $ 263.8 | $ 240.0
Operating Expenses [Abstract] |  |
Fuel and Purchased Power | 86.5 | 77.1
Operating and Maintenance | 104.7 | 99.9
Depreciation | 28.2 | 24.6
Total Operating Expenses | 219.4 | 201.6
Operating Income | 44.4 | 38.4
Other Income (Expense) [Abstract] |  |
Interest Expense | (12.3) | (11.0)
Equity Earnings in ATC | 5.2 | 4.6
Other | 2.7 | 0.7
Total Other Expense | (4.4) | (5.7)
Income Before Income Taxes | 40.0 | 32.7
Income Tax Expense | 7.5 | 8.3
Net Income | $ 32.5 | $ 24.4
Average Shares of Common Stock [Abstract] |  |
Basic | 38.9 | 36.8
Diluted | 39.0 | 36.9
Basic Earnings Per Share of Common Stock | $ 0.83 | $ 0.66
Diluted Earnings Per Share of Common Stock | $ 0.83 | $ 0.66
Dividends Per Share of Common Stock | $ 0.475 | $ 0.46

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