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Summary of Significant Accounting Policies Fuel Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other | $ 24.4 | $ 29.5
Public Utilities, Inventory, Fuel [Member] |  |
Public Utilities, Inventory | $ 46.3 | $ 57.6

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