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Income Tax Expense (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Expense [Abstract]        
Current Federal Tax Expense (Benefit)   $ 0 [1] $ 1.4 [1] $ (23.0) [1]
Current State Tax Expense (Benefit)   0.5 [1] (1.6) [1] 1.3 [1]
Total Current Tax Expense (Benefit)   0.5 (0.2) (21.7)
Deferred Federal Tax Expense   38.1 [2] 27.3 [2] 61.4 [2]
Deferred State Tax Expense (Benefit)   (1.7) [2] 9.5 [2] 5.3 [2]
Change in Valuation Allowance   2.0 [3] (0.1) [3] 0.2 [3]
Investment Tax Credit Amortization   (0.9) (0.9) (0.9)
Total Deferred Tax Expense   37.5 35.8 66.0
Total Income Tax Expense   38.0 35.6 44.3
2010 Rate Case Stipulation Agreement, Revenue Receivable Foregone [Member]
        
Income Tax Expense [Abstract]        
Total Deferred Tax Expense   0 (6.2) 0
PPACA Elimination of Medicare Part D [Member]
        
Income Tax Expense [Abstract]        
Total Deferred Tax Expense 2.9 0 (2.9) 0
Unusual or Infrequent Item [Line Items]        
Tax Adjustments, Settlements, and Unusual Provisions   $ 0 $ 0 $ 4.0
[1] For the years ended December 31, 2012 and 2011, the federal and state current tax expense (benefit) was due to NOLs which resulted primarily from the bonus depreciation provision of the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010. The 2012 and 2011 federal and state NOLs will be carried forward to offset future taxable income. For the year ended December 31, 2010, a federal current tax benefit was recorded as a result of tax planning initiatives and the bonus depreciation provision in the Small Business Jobs Act of 2010. The 2010 federal NOL was partially utilized by carrying it back against prior years’ income with the remainder carried forward to offset future years’ income.
[2] For the year ended December 31, 2012, the state deferred tax benefit of $1.7 million is due to state renewable tax credits earned which will be carried forward to offset future state income tax expense. The year ended December 31, 2011, included an income tax benefit for the reversal of a $6.2 million deferred tax liability related to a revenue receivable that Minnesota Power agreed to forgo as part of a stipulation and settlement agreement in its 2010 rate case and a benefit of $2.9 million related to the MPUC approval of our request to defer the retail portion of the tax charge taken in 2010 as a result of the PPACA. Included in the year ended December 31, 2010, was a charge of $4.0 million as a result of the PPACA. (See Note 5. Regulatory Matters.)
[3] For the year ending December 31, 2012, the change in the valuation allowance is due to state renewable tax credits earned in 2012 which are not expected to be utilized within their allowable tax carryforward period.