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Summary of Significant Accounting Policies, Regulated Operations (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause under recoveries |  | $ 3.7 | $ 68.3
Fuel clause over recoveries |  | 1.6 | 0.0
Total Current Regulatory Assets |  | 42.7 | 97.1
Total Non-Current Regulatory Assets |  | 404.8 | 411.5
Total Current Regulatory Liabilities |  | 21.4 | 24.4
Total Non-Current Regulatory Liabilities |  | 279.6 | 263.0
Crossroads Wind Farm Rider Over Recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities | [1] | 8.6 | 10.3
Smart Grid rider over recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities | [1] | 8.0 | 12.5
Other [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities | [1] | 3.2 | 1.6
Accrued removal obligations, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non-Current Regulatory Liabilities |  | 256.4 | 248.1
Pension tracker |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non-Current Regulatory Liabilities |  | 23.2 | 14.9
Oklahoma demand program rider under recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets | [2] | 26.6 | 19.7
Other [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets | [2] | 12.4 | 9.1
Total Non-Current Regulatory Assets |  | 18.0 | 16.8
Benefit obligations regulatory asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non-Current Regulatory Assets |  | 254.2 | 261.1
Income taxes recoverable from customers, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non-Current Regulatory Assets |  | 56.3 | 56.1
Smart Grid |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non-Current Regulatory Assets |  | 43.8 | 43.9
Deferred storm expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non-Current Regulatory Assets |  | 17.0 | 17.5
Unamortized loss on reacquired debt |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non-Current Regulatory Assets |  | $ 15.5 | $ 16.1
[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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