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Income Tax Expense - Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Unusual or Infrequent Item [Line Items]      
Income Before Non-Controlling Interest and Income Taxes $ 129.2 $ 119.1 $ 91.5
Statutory Federal Income Tax Rate 35.00% 35.00% 35.00%
Income Taxes Computed at 35 Percent Statutory Federal Rate 45.2 41.7 32.0
State Income Taxes - Net of Federal Income Tax Benefit 6.0 4.5 5.4
Regulatory Differences for Utility Plant (1.2) (2.0) (2.5)
Production Tax Credit (4.3) (1.6) (1.2)
Other (1.0) (2.3) (2.9)
Income Tax Expense 35.6 44.3 30.8
Effective Income Tax Rate 27.60% 37.20% 33.70%
DTA Tax Charge, Elimination of Medicare Part D [Member]
      
Unusual or Infrequent Item [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions 0 4.0 0
DTL Reversal, Revenue Receivable Forgone [Member]
      
Unusual or Infrequent Item [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions (6.2) 0 0
Income Tax Benefit, MPUC Approval of Deferral of PPACA [Member]
      
Unusual or Infrequent Item [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions $ (2.9) $ 0 $ 0