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Regulatory Matters - Regulatory Liabilities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Regulatory Liabilities [Line Items] |  |
Non-Current Regulatory Liabilties | $ 45.3 | $ 43.5
Income Taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Non-Current Regulatory Liabilties | 21.2 | 21.9
Plant Removal Obligations [Member] |  |
Regulatory Liabilities [Line Items] |  |
Non-Current Regulatory Liabilties | 15.9 | 15.0
Other [Member] |  |
Regulatory Liabilities [Line Items] |  |
Non-Current Regulatory Liabilties | $ 8.2 | $ 6.6

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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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