Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition Under Previous Guidance

The table below provides results for the three months ended March 31, 2018 as if they had been prepared under historic accounting guidance. We included operating revenue information for the three months ended March 31, 2017 for comparability.

	Three Months Ended March 31,
(in millions)	2018		2017
Operating Revenues
Gas Distribution	$	983.8	$	836.5
Gas Transportation	342.2		338.6
Electric	423.3		421.7
Other	1.5		1.8
Total Operating Revenues	$	1,750.8	$	1,598.6

Disaggregation of Revenue

The table below reconciles revenue disaggregation by customer class to segment revenue as well as to revenues reflected on the Condensed Statements of Consolidated Income (unaudited):

Three Months Ended March 31, 2018 (in millions)	Gas Distribution Operations		Electric Operations		Corporate and Other		Total
Customer Revenues(1)
Residential	$	893.6	$	114.5	$	—	$	1,008.1
Commercial	308.3		116.9		—		425.2
Industrial	74.6		162.5		—		237.1
Off-system	22.3		—		—		22.3
Miscellaneous	16.8		7.5		0.2		24.5
Total Customer Revenues	$	1,315.6	$	401.4	$	0.2	$	1,717.2
Other Revenues	11.7		21.9		—		33.6
Total Operating Revenues	$	1,327.3	$	423.3	$	0.2	$	1,750.8

Customer Accounts Receivable

(in millions)	Customer Accounts Receivable, Billed (less reserve)(1)		Customer Accounts Receivable, Unbilled (less reserve)(2)
Balance as of December 31, 2017	$	477.0	$	356.0
Balance as of March 31, 2018	617.2		274.6
Increase (Decrease)	$	140.2	$	(81.4	)

⁽¹⁾ Customer billed receivables increased over the period due to the seasonal increase in customer usage during peak winter usage months.

⁽²⁾ Customer unbilled receivables decreased over the period due to the expected seasonal decrease in customer usage in March when compared to December.