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Summary of Significant Accounting Policies, Regulated Operations (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Current Regulatory Assets | $ 23.5 |  | $ 27.0 |
Total Non-Current Regulatory Assets | 496.2 |  | 510.6 |
Fuel clause over recoveries | 12.0 |  | 109.2 |
Total Current Regulatory Liabilities | 33.7 |  | 141.1 |
Total Non-Current Regulatory Liabilities | 242.7 |  | 245.1 |
Smart Grid rider over recovery [Member] |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Current Regulatory Liabilities | 19.1 | [1] | 24.1 | [1]
Other [Member] |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Current Regulatory Liabilities | 2.6 | [1] | 7.8 | [1]
Accrued removal obligations, net |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Liabilities | 219.2 |  | 218.2 |
Pension tracker |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Liabilities | 14.2 |  | 9.2 |
Deferred pension credits |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Liabilities | 9.3 |  | 17.7 |
Crossroads wind farm rider under recovery [Member] |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Current Regulatory Assets | 7.2 | [2] | 14.9 | [2]
Oklahoma demand program rider under recovery [Member] |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Current Regulatory Assets | 9.5 | [2] | 9.2 | [2]
Other [Member] |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Current Regulatory Assets | 6.8 | [2] | 2.9 | [2]
Total Non-Current Regulatory Assets | 14.7 |  | 12.3 |
Benefit obligations regulatory asset |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Assets | 350.1 |  | 370.6 |
Income taxes recoverable from customers, net |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Assets | 55.7 |  | 54.7 |
Smart Grid |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Assets | 43.4 |  | 42.8 |
Deferred storm expenses |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Assets | 18.3 |  | 12.7 |
Unamortized loss on reacquired debt |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Assets | 12.1 |  | 13.0 |
Deferred pension expenses |  |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |  |
Total Non-Current Regulatory Assets | $ 1.9 |  | $ 4.5 |
[1] | Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.
[2] | Included in Other Current Assets on the Condensed Consolidated Balance Sheets.

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + 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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