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Leases - Schedule of Financial Statement Information of Lease Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Leased Assets [Line Items] |  |  |  |
Operating lease cost |  | $ 6.4 | $ 5.9 | $ 6.3
Operating cash flows for operating leases |  | 5.2 | 5.3 | 6.3
Right-of-use assets obtained in exchange for new operating lease liabilities |  | 0.0 | 1.5 | 0.0
Right-of-use assets at period end | [1] | $ 25.9 | $ 30.2 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net |
Operating lease liabilities at period end | [2] | $ 30.5 | $ 34.8 |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  | Liabilities, Other than Long-Term Debt, Noncurrent | Liabilities, Other than Long-Term Debt, Noncurrent |
Operating lease weighted-average remaining lease term (in years) |  | 11 years 4 months 24 days | 11 years 7 months 6 days |
Operating lease weighted-average discount rate |  | 4.00% | 4.00% |
OG&E [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease cost |  | $ 6.4 | $ 5.9 | 5.7
Operating cash flows for operating leases |  | 5.2 | 5.3 | 5.7
Right-of-use assets obtained in exchange for new operating lease liabilities |  | 0.0 | 1.5 | $ 0.0
Right-of-use assets at period end | [1] | $ 25.9 | $ 30.2 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net |
Operating lease liabilities at period end | [2] | $ 30.5 | $ 34.8 |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  | Liabilities, Other than Long-Term Debt, Noncurrent | Liabilities, Other than Long-Term Debt, Noncurrent |
Operating lease weighted-average remaining lease term (in years) |  | 11 years 4 months 24 days | 11 years 7 months 6 days |
Operating lease weighted-average discount rate |  | 4.00% | 4.00% |
[1] | Included in Property, Plant and Equipment in the Registrants' balance sheets.
[2] | Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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