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Segments Of Business (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Schedule Of Operating Income Derived From Revenues And Expenses By Segment
Year Ended December 31, (in millions)
202020192018
Operating Revenues
Gas Distribution Operations
Unaffiliated $3,128.1 $3,509.7 $3,406.4 
Intersegment12.1 13.1 13.1 
Total3,140.2 3,522.8 3,419.5 
Electric Operations
Unaffiliated1,535.9 1,698.4 1,707.4 
Intersegment0.7 0.8 0.8 
Total1,536.6 1,699.2 1,708.2 
Corporate and Other
Unaffiliated 17.7 0.8 0.7 
Intersegment449.8 468.1 517.6 
Total467.5 468.9 518.3 
Eliminations(462.6)(482.0)(531.5)
Consolidated Operating Revenues$4,681.7 $5,208.9 $5,114.5 
Year Ended December 31, (in millions)
202020192018
Operating Income (Loss)
Gas Distribution Operations(1)
$199.1 $675.4 $(254.1)
Electric Operations348.8 406.8 386.1 
Corporate and Other(2)
2.9 (191.5)(7.3)
Consolidated Operating Income$550.8 $890.7 $124.7 
Depreciation and Amortization
Gas Distribution Operations$363.1 $403.2 $301.0 
Electric Operations321.3 277.3 262.9 
Corporate and Other41.5 36.9 35.7 
Consolidated Depreciation and Amortization$725.9 $717.4 $599.6 
Assets
Gas Distribution Operations$13,433.0 $14,224.5 $13,527.0 
Electric Operations6,443.1 6,027.6 5,735.2 
Corporate and Other2,164.4 2,407.7 2,541.8 
Consolidated Assets$22,040.5 $22,659.8 $21,804.0 
Capital Expenditures(3)
Gas Distribution Operations$1,266.9 $1,380.3 $1,315.3 
Electric Operations422.8 468.9 499.3 
Corporate and Other31.1 18.6 — 
Consolidated Capital Expenditures$1,720.8 $1,867.8 $1,814.6 
(1)In 2020, Gas Distribution Operations reflects the loss of $412.4 million on the sale of the Massachusetts Business. For additional information, see Note 1, "Nature of Operations and Summary of Significant Accounting Policies".
(2)In 2019, Corporate and Other reflects an impairment charge of $204.8 million for goodwill related to Columbia of Massachusetts. For additional information, see Note 7, "Goodwill and Other Intangible Assets."
(3)Amounts differ from those presented on the Statements of Consolidated Cash Flows primarily due to the inclusion of capital expenditures in current liabilities, the capitalized portion of the Corporate Incentive Plan payout, and AFUDC Equity.