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Summary of Significant Accounting Policies Regulated Operations (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause under recoveries |  | $ 0.0 | $ 68.3
Fuel clause over recoveries |  | 61.3 | 0.0
Regulatory Assets, Current |  | 46.5 | 98.2
Regulatory Assets, Noncurrent |  | 402.2 | 410.4
Regulatory Liability, Current |  | 68.8 | 24.4
Regulatory Liability, Noncurrent |  | 272.6 | 263.0
Prior Period Reclassification Adjustment |  | 1.1 |
Smart Grid rider over recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Current | [1] | 2.0 | 12.5
Crossroads Wind Farm Rider Over Recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Current | [1] | 2.9 | 10.3
Other Regulatory Liabilities [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Current | [1] | 2.6 | 1.6
Accrued removal obligations [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Noncurrent |  | 254.9 | 248.1
Pension tracker [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Noncurrent |  | 17.7 | 14.9
Oklahoma demand program rider under recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Current | [2] | 36.6 | 19.7
Other Regulatory Assets [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Current | [2],[3] | 9.9 | 10.2
Regulatory Assets, Noncurrent | [3] | 17.3 | 15.7
Benefit obligations regulatory asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 242.2 | 261.1
Income taxes recoverable from customers, net [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 56.7 | 56.1
Smart Grid [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 43.6 | 43.9
Deferred storm expenses [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 27.6 | 17.5
Unamortized loss on reacquired debt [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | $ 14.8 | $ 16.1
[1] | Included in Other Current Liabilities on the Consolidated Balance Sheets.
[2] | Included in Other Current Assets on the Consolidated Balance Sheets.
[3] | Prior year amount of $1.1 million reclassified from Non-Current Other assets to Current Other assets.

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