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Regulated Operations (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause under recoveries |  | $ 271.7 | $ 151.9
Current Regulatory Assets |  | 1,041.0 | 182.6
Non-Current Regulatory Assets |  | 505.1 | 1,230.8
Current Regulatory Liabilities |  | 4.6 | 2.5
Non-Current Regulatory Liabilities |  | 1,205.3 | 1,231.1
Other (B) |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Liabilities | [1] | 4.6 | 2.5
Non-Current Regulatory Liabilities |  | 3.1 | 3.6
Income taxes recoverable from customers, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 918.5 | 930.7
Accrued removal obligations, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 283.7 | 296.8
Winter Storm Uri costs | OKLAHOMA |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets |  | 750.5 | 0.0
Non-Current Regulatory Assets |  | 0.0 | 747.9
Winter Storm Uri costs | ARKANSAS |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 83.9 | 88.9
Benefit obligations regulatory asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 101.0 | 109.2
Oklahoma deferred storm expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 210.5 | 172.8
Smart Grid |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 0.4 | 3.9
Dry Scrubber Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 18.5 | 18.9
Unamortized loss on reacquired debt |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 8.5 | 8.9
Deferred Pension Expenses [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 12.1 | 12.1
Other Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 10.7 | 9.7
Non-Current Regulatory Assets |  | 10.2 | 10.4
Pension tracker |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 45.7 | 42.9
SPP Cost Tracker Rider Under Recovery |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 8.1 | 9.3
COVID-19 Deferred Expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 8.3 | 8.2
Oklahoma Energy Efficiency Rider Under Recovery |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 0.0 | 11.7
Deferred Plant Expense |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | $ 6.0 | $ 6.7
[1] | Included in Other Current Liabilities in the condensed balance sheets.
[2] | Included in Other Current Assets in the condensed balance sheets. The Oklahoma Winter Storm Uri regulatory asset was reclassified as current at June 30, 2022, in anticipation of the securitization process being completed in July 2022 and OG&E receiving funds from the ODFA.

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