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Regulatory Matters - The Patient Protection and Affordable Care Act of 2010 (PPACA) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 12 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2011 MPUC Approval of Deferral of PPACA [Member] | Dec. 31, 2010 Elimination of Medicare Part D [Member]
Unusual or Infrequent Item [Line Items] |  |  |  |  |  |  |
Income Tax Expense (Benefit) | $ 4.8 | $ 3.8 | $ 13.1 | $ 12.0 |  | $ 2.9 |
Reversal of Previously Recorded Tax Benefit |  |  |  |  |  | 2.9 | 4.0
Non-Current Regulatory Assets | $ 336.9 |  | $ 336.9 |  | $ 345.9 | $ 5.0 |

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