XML 71 R54.htm IDEA: XBRL DOCUMENT v3.25.0.1
Summary of Significant Accounting Policies - Summary of Changes to Asset Retirement Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Balance at January 1 $ 81.3 $ 78.3
Accretion expense 0.9 0.7
Liabilities settled [1] (0.2) 0.0
Revisions in estimated cash flows [2] 2.6 2.3
Balance at December 31 $ 84.6 $ 81.3
[1] Asset retirement obligations were settled for asbestos removal at OG&E's generating facilities.
[2] Assumptions changed due to new removal estimates related to asbestos abatement at two of OG&E's generating facilities in 2023, and wind turbine removal at three of OG&E's wind farms in 2024.