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Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Business Segments [Line Items] |  |  |
Operating Revenue | $ 263.8 | $ 240.0 |
Fuel and Purchased Power Expense | 86.5 | 77.1 |
Operating and Maintenance Expense | 104.7 | 99.9 |
Depreciation Expense | 28.2 | 24.6 |
Operating Income (Loss) | 44.4 | 38.4 |
Interest Expense | (12.3) | (11.0) |
Equity Earnings in ATC | 5.2 | 4.6 |
Other Income (Expense) | 2.7 | 0.7 |
Income (Loss) Before Income Taxes | 40.0 | 32.7 |
Income Tax Expense (Benefit) | 7.5 | 8.3 |
Net Income | 32.5 | 24.4 |
Total Assets | 3,251.3 | 2,906.6 | 3,253.4
Property, Plant and Equipment - Net | 2,366.7 | 2,002.8 | 2,347.6
Accumulated Depreciation | 1,179.8 | 1,099.0 |
Capital Additions | 43.1 | 39.7 |
Regulated Operations [Member] |  |  |
Business Segments [Line Items] |  |  |
Operating Revenue | 241.4 | 218.6 |
Fuel and Purchased Power Expense | 86.5 | 77.1 |
Operating and Maintenance Expense | 82.2 | 78.1 |
Depreciation Expense | 26.8 | 23.2 |
Operating Income (Loss) | 45.9 | 40.2 |
Interest Expense | (10.7) | (9.6) |
Equity Earnings in ATC | 5.2 | 4.6 |
Other Income (Expense) | 1.1 | 0.8 |
Income (Loss) Before Income Taxes | 41.5 | 36.0 |
Income Tax Expense (Benefit) | 9.4 | 11.6 |
Net Income | 32.1 | 24.4 |
Total Assets | 2,967.9 | 2,586.4 |
Property, Plant and Equipment - Net | 2,300.8 | 1,945.6 |
Accumulated Depreciation | 1,121.8 | 1,045.9 |
Capital Additions | 42.6 | 38.7 |
Investments and Other [Member] |  |  |
Business Segments [Line Items] |  |  |
Land in Minnesota (in acres) | 6,000 |  |
Operating Revenue | 22.4 | 21.4 |
Fuel and Purchased Power Expense | 0 | 0 |
Operating and Maintenance Expense | 22.5 | 21.8 |
Depreciation Expense | 1.4 | 1.4 |
Operating Income (Loss) | (1.5) | (1.8) |
Interest Expense | (1.6) | (1.4) |
Equity Earnings in ATC | 0 | 0 |
Other Income (Expense) | 1.6 | (0.1) |
Income (Loss) Before Income Taxes | (1.5) | (3.3) |
Income Tax Expense (Benefit) | (1.9) | (3.3) |
Net Income | 0.4 | 0 |
Total Assets | 283.4 | 320.2 |
Property, Plant and Equipment - Net | 65.9 | 57.2 |
Accumulated Depreciation | 58.0 | 53.1 |
Capital Additions | $ 0.5 | $ 1.0 |

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