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Income Tax Expense (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Disclosure [Abstract]      
Current Federal Tax Expense (Benefit) $ 1.4 [1] $ (23.0) [1] $ (42.6) [1]
Current State Tax Expense (Benefit) (1.6) [1] 1.3 [1] (1.8) [1]
Total Current Tax Expense (Benefit) (0.2) (21.7) (44.4)
Deferred Federal Tax Expense (Benefit) 27.3 [2] 61.4 [2] 66.0 [2]
Deferred State Tax Expense (Benefit) 9.5 [2] 5.3 [2] 10.3 [2]
Change in Valuation Allowance (0.1) 0.2 (0.1)
Investment Tax Credit Amortization (0.9) (0.9) (1.0)
Total Deferred Tax Expense 35.8 66.0 75.2
Total Income Tax Expense 35.6 44.3 30.8
DTA Tax Charge, Elimination of Medicare Part D [Member]
      
Income Tax Contingency [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions 0 4.0 0
Income Tax Benefit, MPUC Approval of Deferral of PPACA [Member]
      
Income Tax Contingency [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions (2.9) 0 0
DTL Reversal, Revenue Receivable Forgone [Member]
      
Income Tax Contingency [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions $ (6.2) $ 0 $ 0
[1] (a)For the year ended December 31, 2011, the federal and state current tax expense (benefit) of $1.4 million and $(1.6) million, respectively, was due to an NOL which resulted primarily from the bonus depreciation provision of the Tax Relief Unemployment Insurance Reauthorization and Job Creation Act of 2010. The 2011 federal and state NOLs will be carried forward to offset future taxable income. For the year ended December 31, 2010, we recorded a federal current tax benefit 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. The 2009 federal current tax benefit was primarily due to the bonus depreciation provision of the American Recovery and Reinvestment Act of 2009.
[2] (b)The year ended December 31, 2011, included an income tax 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 PPACA and a 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. Included in the year ended December 31, 2010, was a charge of $4.0 million as a result of PPACA. (See Note 5. Regulatory Matters.)