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EFFECTS OF REGULATION - Regulatory Asset - PSO (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 445.9 | $ 514.0
Total Noncurrent Regulatory Assets | 5,129.2 | 5,092.4
Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 1,310.8 | 837.3
Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 3,818.4 | 4,255.1
Earns/earning a return | Under-recovered Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 245.7 | 357.4
Remaining Recovery Period | 1 year |
Earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 395.1 | 349.9
Earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 51.0 | 0.0
Earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 20.7 | 49.8
Earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 1,711.5 | 1,946.9
Earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 106.7 | 170.9
Remaining Recovery Period | 7 years |
Earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 661.2 | 664.2
Remaining Recovery Period | 22 years |
Earns/earning a return | Approved for recovery | Environmental Control Projects |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 29.1 | 31.4
Remaining Recovery Period | 16 years |
Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 159.9 | 124.9
Does not earns/earning a return | Under-recovered Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 116.0 | 62.7
Remaining Recovery Period | 1 year |
Does not earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 915.7 | 487.4
Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 300.8 | 408.9
Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 86.3 | 52.6
Does not earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 2,106.9 | 2,308.2
Does not earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 66.5 | 38.5
Remaining Recovery Period | 7 years |
Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 240.1 | 269.1
Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 974.2 | 1,054.1
Remaining Recovery Period | 12 years |
Does not earns/earning a return | Approved for recovery | Unrealized Loss on Forward Commitments |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 53.3 | 131.4
Remaining Recovery Period | 8 years |
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 64.7 | 118.3
Total Noncurrent Regulatory Assets | 527.8 | 522.7
PUBLIC SERVICE COMPANY OF OKLAHOMA | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 497.5 | 434.0
PUBLIC SERVICE COMPANY OF OKLAHOMA | Earns/earning a return | Under-recovered Fuel Costs |  |
Regulatory Asset [Line Items] |  |
Total Current Regulatory Assets | $ 64.7 | 118.3
Remaining Recovery Period | 1 year |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 425.4 | 325.3
PUBLIC SERVICE COMPANY OF OKLAHOMA | Earns/earning a return | Approved for recovery | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 106.7 | 26.2
Remaining Recovery Period | 7 years |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Earns/earning a return | Approved for recovery | Plant Retirement Costs - Unrecovered Plant |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 274.0 | 254.1
Remaining Recovery Period | 22 years |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Earns/earning a return | Approved for recovery | Environmental Control Projects |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 21.2 | 22.5
Remaining Recovery Period | 16 years |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Earns/earning a return | Approved for recovery | Meter Replacement Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 10.1 | 14.1
Remaining Recovery Period | 3 years |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 13.4 | 8.4
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Pending final regulatory approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 30.3 | 88.7
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Pending final regulatory approval | NOCL - Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 16.4 | 0.0
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Pending final regulatory approval | Storm-Related Costs |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 4.9 | 88.5
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Pending final regulatory approval | Other Regulatory Assets Pending Final Regulatory Approval |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 9.0 | 0.2
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 72.1 | 108.7
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Approved for recovery | Other Regulatory Assets Approved for Recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 10.6 | 16.2
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Approved for recovery | Pension and OPEB Funded Status |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 57.6 | 62.6
Remaining Recovery Period | 12 years |
PUBLIC SERVICE COMPANY OF OKLAHOMA | Does not earns/earning a return | Approved for recovery | Unrealized Loss on Forward Commitments |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 3.9 | $ 29.9
Remaining Recovery Period | 2 years |

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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