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Summary of Significant Accounting Policies Fuel Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Other | $ 122.3 | $ 108.0
Public Utilities, Inventory, Fuel [Member] |  |
Public Utilities, Inventory | 119.3 | 66.7
Other |  | 11.0
Other Assets | $ 5.4 |
Enable Gas Transportation and Storage Agreement [Member] | Public Utilities, Inventory, Fuel [Member] |  |
Public Utilities, Inventory |  | $ 2.7

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