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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 | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Unusual or Infrequent Item [Line Items] |  |  |  |
Deferred Income Tax Expense (Benefit) |  | $ 37.5 | $ 35.8 | $ 66.0
Non-Current Regulatory Asset |  | 340.3 | 345.9 |
PPACA Elimination of Medicare Part D [Member] |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |
Reversal of Previously Recorded Tax Benefit |  | 0 | 0 | 4.0
Deferred Income Tax Expense (Benefit) | 2.9 | 0 | (2.9) | 0
Non-Current Regulatory Asset |  | $ 5.0 |  |

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