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Regulated Operations (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause under recoveries |  | $ 98.2 | $ 0.0
Current Regulatory Assets |  | 115.3 | 19.8
Non-Current Regulatory Assets |  | 1,264.9 | 415.6
Current Regulatory Liabilities |  | 6.3 | 35.1
Fuel clause over recoveries |  | 0.0 | 28.6
Non-Current Regulatory Liabilities |  | 1,247.7 | 1,188.9
Oklahoma Demand Program Over Recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Liabilities | [1] | 4.7 | 1.5
Other (B) |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Liabilities | [1] | 1.6 | 5.0
Non-Current Regulatory Liabilities |  | 3.8 | 4.7
Income taxes recoverable from customers, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 938.8 | 867.4
Accrued removal obligations, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 305.1 | 316.8
Benefit obligations regulatory asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 130.6 | 164.9
Oklahoma deferred storm expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 173.8 | 158.8
Smart Grid |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 5.9 | 11.2
Dry Scrubber Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 19.1 | 19.7
Unamortized loss on reacquired debt |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 9.1 | 9.7
Deferred Pension Expenses [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 11.8 | 9.3
Other Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 7.7 | 8.4
Non-Current Regulatory Assets |  | 10.6 | 11.1
Pension tracker |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 41.6 | 18.1
SPP Cost Tracker Rider Under Recovery |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 7.7 | 7.0
COVID-19 Deferred Expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 8.0 | 6.4
Extreme Cold Weather Costs | OKLAHOMA |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 756.3 | 0.0
Extreme Cold Weather Costs | ARKANSAS |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 91.0 | 0.0
Frontier Plant |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 7.1 | 6.4
Generation Capacity Replacement |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | $ 1.7 | $ 4.4
[1] | Included in Other Current Liabilities in the balance sheets.
[2] | Included in Other Current Assets in the balance sheets.

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