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Summary of Significant Accounting Policies Fuel Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other | $ 41.2 | $ 24.4
OG&E [Member] |  |
Fuel inventories | 36.5 | 46.3
Other | 36.9 | 19.6
Public Utilities, Inventory, Fuel [Member] |  |
Fuel inventories | $ 36.5 | $ 46.3

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