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Goodwill
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
 The following presents our goodwill balance allocated by segment as of June 30, 2021:
(in millions)Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Goodwill$1,485.9 $— $— $1,485.9 

For our annual goodwill impairment analysis performed as of May 1, 2021, we performed a qualitative "step 0" assessment and determined that it was more likely than not that the estimated fair value of the reporting unit substantially exceeded the related carrying value of our reporting unit. For this test, we assessed various assumptions, events and circumstances that would have affected the estimated fair value of the reporting units as compared to their baseline May 1, 2020 "step 1" fair value measurement. There have been no impairments to the carrying value of our goodwill during the periods presented.