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Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The tables below reconcile revenue disaggregation by customer class to segment revenue, as well as to revenues reflected on the Condensed Statements of Consolidated Income (Loss) (unaudited) for the three and six months ended June 30, 2021 and June 30, 2020:

Three Months Ended June 30, 2021 (in millions)			Gas Distribution Operations						Electric Operations						Corporate and Other(2)						Total
Customer Revenues(1)
Residential			$	378.6					$	131.9					$	—					$	510.5
Commercial			125.4						130.0						—						255.4
Industrial			44.0						119.0						—						163.0
Off-system			17.0						—						—						17.0
Miscellaneous			4.9						1.4						0.2						6.5
Total Customer Revenues			$	569.9					$	382.3					$	0.2					$	952.4
Other Revenues			4.4						21.2						8.0						33.6
Total Operating Revenues			$	574.3					$	403.5					$	8.2					$	986.0

(1)Customer revenue amounts exclude intersegment revenues. See Note 19, "Business Segment Information," for discussion of intersegment revenues.

(2)Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.

Three Months Ended June 30, 2020 (in millions)			Gas Distribution Operations						Electric Operations						Corporate and Other						Total
Customer Revenues(1)
Residential			$	414.7					$	127.5					$	—					$	542.2
Commercial			122.7						112.9						—						235.6
Industrial			48.6						89.3						—						137.9
Off-system			8.0						—						—						8.0
Miscellaneous			5.3						3.5						0.2						9.0
Total Customer Revenues			$	599.3					$	333.2					$	0.2					$	932.7
Other Revenues			7.0						23.0						—						30.0
Total Operating Revenues			$	606.3					$	356.2					$	0.2					$	962.7

(1)Customer revenue amounts exclude intersegment revenues. See Note 19, "Business Segment Information," for discussion of intersegment revenues.

Six Months Ended June 30, 2021 (in millions)			Gas Distribution Operations						Electric Operations						Corporate and Other(2)						Total
Customer Revenues(1)
Residential			$	1,152.1					$	261.1					$	—					$	1,413.2
Commercial			396.9						252.8						—						649.7
Industrial			101.9						241.9						—						343.8
Off-system			31.4						—						—						31.4
Miscellaneous			14.7						5.7						0.4						20.8
Total Customer Revenues			$	1,697.0					$	761.5					$	0.4					$	2,458.9
Other Revenues			13.1						44.5						15.1						72.7
Total Operating Revenues			$	1,710.1					$	806.0					$	15.5					$	2,531.6
(1)Customer revenue amounts exclude intersegment revenues. See Note 19, "Business Segment Information," for discussion of intersegment revenues. (2)Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.
Six Months Ended June 30, 2020 (in millions)			Gas Distribution Operations						Electric Operations						Corporate and Other						Total
Customer Revenues(1)
Residential			$	1,211.2					$	246.7					$	—					$	1,457.9
Commercial			392.1						233.1						—						625.2
Industrial			122.8						198.4						—						321.2
Off-system			26.7						—						—						26.7
Miscellaneous			17.8						9.4						0.4						27.6
Total Customer Revenues			$	1,770.6					$	687.6					$	0.4					$	2,458.6
Other Revenues			63.7						45.9						—						109.6
Total Operating Revenues			$	1,834.3					$	733.5					$	0.4					$	2,568.2
(1)Customer revenue amounts exclude intersegment revenues. See Note 19, "Business Segment Information," for discussion of intersegment revenues.

Customer Accounts Receivable

The opening and closing balances of customer receivables for the six months ended June 30, 2021 are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts.

(in millions)			Customer Accounts Receivable, Billed (less reserve)						Customer Accounts Receivable, Unbilled (less reserve)
Balance as of December 31, 2020			$	400.0					$	327.2
Balance as of June 30, 2021			323.7						203.6

Financing Receivable, Allowance for Credit Loss

A rollforward of our allowance for credit losses as of June 30, 2021 and December 31, 2020 are presented in the table below:

(in millions)			Gas Distribution Operations						Electric Operations						Corporate and Other						Total
Balance as of January 1, 2021			$	41.8					$	9.7					$	0.8					$	52.3
Current period provisions			5.1						0.4						—						5.5
Write-offs charged against allowance			(18.3)						(4.9)						—						(23.2)
Recoveries of amounts previously written off			6.8						0.2						—						7.0
Balance as of June 30, 2021			$	35.4					$	5.4					$	0.8					$	41.6

(in millions)			Gas Distribution Operations						Electric Operations						Corporate and Other						Total
Balance as of January 1, 2020			9.1						3.1						0.8						13.0
Current period provisions			45.3						9.3						—						54.6
Write-offs charged against allowance			(26.7)						(3.0)						—						(29.7)
Recoveries of amounts previously written off			14.1						0.3						—						14.4
Balance as of December 31, 2020			41.8						9.7						0.8						52.3

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045

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