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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Deferred Income Tax Benefit |  | $ 28.6 | $ 37.5 | $ 35.8 |
Non-Current Regulatory Asset |  | 263.8 | 340.3 |  |
PPACA Elimination of Medicare Part D [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Reversal of Previously Recorded Tax Benefit |  |  |  |  | 4.0
Deferred Income Tax Benefit | 2.9 | 0 | 0 | (2.9) |
Non-Current Regulatory Asset | $ 5.0 |  |  |  |

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