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Regulated Operations (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause over recoveries |  | $ 1.4 | $ 61.3
Fuel clause under recoveries |  | 0.5 | 0.0
Current Regulatory Assets |  | 59.4 | 46.5
Non-Current Regulatory Assets |  | 404.8 | 402.2
Current Regulatory Liabilities |  | 5.2 | 68.8
Non-Current Regulatory Liabilities |  | 292.0 | 273.6
Prior Period Reclassification Adjustment |  | 1.0 |
Other Regulatory Liability [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Liabilities | [1] | 3.8 | 7.5
Non-Current Regulatory Liabilities | [2] | 1.0 | 1.0
Accrued removal obligations, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 260.1 | 254.9
Pension tracker |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 30.9 | 17.7
Oklahoma demand program rider under recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [3] | 48.9 | 36.6
Other Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [3] | 7.6 | 5.4
Non-Current Regulatory Assets |  | 16.8 | 17.3
Benefit obligations regulatory asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 235.0 | 242.2
Income taxes recoverable from customers, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 60.0 | 56.7
Smart Grid |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 43.4 | 43.6
Deferred storm expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 35.9 | 27.6
Unamortized loss on reacquired debt |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 13.7 | 14.8
SPP Cost Tracker Rider Under Recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [3] | $ 2.4 | $ 4.5
[1] | Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.
[2] | Prior year amount of $1.0 million reclassified from Deferred Other Liabilities to Non-Current Regulatory Liabilities.
[3] | Included in Other Current Assets on the Condensed Consolidated Balance Sheets.

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