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Regulatory Matters - Regulatory Liabilities (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Regulatory Liabilities [Line Items]
Non-Current Regulatory Liabilties	$ 44.6	$ 43.6
Income Taxes [Member]
Regulatory Liabilities [Line Items]
Non-Current Regulatory Liabilties	21.6	23.4
Plant Removal Obligations [Member]
Regulatory Liabilities [Line Items]
Non-Current Regulatory Liabilties	16.7	16.9
Other [Member]
Regulatory Liabilities [Line Items]
Non-Current Regulatory Liabilties	$ 6.3	$ 3.3

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant