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Regulated Operations (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause under recoveries |  | $ 182.3 | $ 151.9
Current Regulatory Assets |  | 203.4 | 182.6
Non-Current Regulatory Assets |  | 1,256.7 | 1,230.8
Current Regulatory Liabilities |  | 1.6 | 2.5
Non-Current Regulatory Liabilities |  | 1,223.3 | 1,231.1
Other (B) |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Liabilities | [1] | 1.6 | 2.5
Non-Current Regulatory Liabilities |  | 3.3 | 3.6
Income taxes recoverable from customers, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 927.3 | 930.7
Accrued removal obligations, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 292.7 | 296.8
Winter Storm Uri costs | OKLAHOMA |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 749.2 | 747.9
Winter Storm Uri costs | ARKANSAS |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 86.3 | 88.9
Benefit obligations regulatory asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 104.4 | 109.2
Oklahoma deferred storm expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 204.6 | 172.8
Smart Grid |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 2.2 | 3.9
Dry Scrubber Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 18.7 | 18.9
Unamortized loss on reacquired debt |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 8.7 | 8.9
Deferred Pension Expenses [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 12.3 | 12.1
Other Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 8.3 | 9.7
Non-Current Regulatory Assets |  | 10.4 | 10.4
Pension tracker |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 45.4 | 42.9
SPP Cost Tracker Rider Under Recovery |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 9.4 | 9.3
COVID-19 Deferred Expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 8.1 | 8.2
Oklahoma Energy Efficiency Rider Under Recovery |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 3.4 | 11.7
Deferred Plant Expense |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | $ 6.4 | $ 6.7
[1] | Included in Other Current Liabilities in the condensed balance sheets.
[2] | Included in Other Current Assets in the condensed balance sheets.

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