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Organization, Consolidation and Presentation of Financial Statements (Tables)
9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Reclassification The prior year reclassifications, which are shown in the table below, did not impact previously reported operating income or net income.
Three Months Ended September 30, 2019Nine Months Ended September 30, 2019
(in millions)
Fuel, purchased power and cost of natural gas sold$0.5 $1.8 
Operations and maintenance(0.5)(1.8)
Operating income$— $—