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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
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2011 Elimination of Medicare Part D [Member] | Dec. 31, 2010 Elimination of Medicare Part D [Member]
Unusual or Infrequent Item [Line Items] |  |  |  |  |  |  |
Reversal of Previously Recorded Tax Benefit |  |  |  |  |  |  | $ 4.0
Deferred Income Tax Benefit | 4.3 | 4.8 | 11.6 | 13.1 |  | (2.9) |
Non-Current Regulatory Assets | $ 337.5 |  | $ 337.5 |  | $ 340.3 | $ 5.0 |

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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