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Goodwill | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | Goodwill The following presents our goodwill balance allocated by segment as of September 30, 2020:
(in millions) |  | Gas Distribution Operations |  | Electric Operations |  | Corporate and Other |  | Total
Goodwill |  | $ | 1,485.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,485.9 |
For our annual goodwill impairment analysis performed as of May 1, 2020, we completed a quantitative "step 1" fair value measurement of our reporting units with a goodwill balance. This analysis incorporated the latest available income statement and cash flow projections, including significant, identifiable impacts of COVID-19 on the operations of each of our goodwill reporting units. We also incorporated other significant inputs to our fair value calculations, including discount rate and market multiples, to reflect current market conditions. The step 1 analysis performed indicated that the fair value of each reporting unit that is allocated goodwill significantly exceeded its carrying value. As a result, no impairment charge was recorded as of the May 1, 2020 test date. During the fourth quarter of 2019, in connection with the preparation of the year-end financial statements, we assessed the matters related to Columbia of Massachusetts (see Note 18-B, "Legal Proceedings") and determined a quantitative "step 1" impairment analysis was required for our Columbia of Massachusetts reporting unit. The December 31, 2019 impairment analysis indicated that the fair value of the Columbia of Massachusetts reporting unit was below its carrying value. As a result, we reduced the Columbia of Massachusetts reporting unit goodwill balance to zero and recognized a goodwill impairment charge totaling $204.8 million in 2019.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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