Revenues (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents the Company's revenues disaggregated by type of service for the years ended December 31, 2021, 2020 and 2019 (in millions):

	For the Year Ended December 31,
	2021		2020		2019
Revenues from Contracts with Customers
Firm Service (1)	$	1,247.5	$	1,211.7	$	1,228.3
Interruptible Service	32.0		33.2		29.0
Other revenues	26.1		18.9		9.1
Total Revenues from Contracts with Customers	1,305.6		1,263.8		1,266.4
Other operating revenues(2)	34.5		33.8		28.8
Total Operating Revenues	$	1,340.1	$	1,297.6	$	1,295.2

(1)Revenues earned from contracts with MVCs are included in firm service given the stand-ready nature of the performance obligation and the guaranteed nature of the fees over the contract term. The years ended December 31, 2020 and 2019, contain $34.4 million and $26.2 million of incremental revenues received related to customer bankruptcies as discussed in Note 5.

(2)Other operating revenues include certain revenues earned from operating leases, pipeline management fees and other activities that are not considered central and ongoing major business operations of the Company and do not represent revenues earned from contracts with customers.

Contract Liabilities

Significant changes in the contract liability balances during the year ended December 31, 2021, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2020(1)	$	17.2
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(5.3)
Increases due to cash received, excluding amounts recognized as     revenues during the period	7.3
Balance as of December 31, 2021(1)	$	19.2

(1)As of December 31, 2021 and 2020, $3.6 million and $4.9 million were recorded in Other current liabilities (current portion) and $15.6 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Significant changes in the contract liability balances during the year ended December 31, 2020, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2019(1)	$	11.8
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(5.1)
Increases due to cash received, excluding amounts recognized as     revenues during the period	10.5
Balance as of December 31, 2020(1)	$	17.2

(1)As of December 31, 2020 and 2019, $4.9 million and $2.2 million were recorded in Other current liabilities (current portion) and $12.3 million and $9.6 million were recorded in Other Liabilities (noncurrent portion).

Remaining Performance Obligation

The following table includes estimated operating revenues expected to be recognized in the future related to agreements that contain performance obligations that were unsatisfied as of December 31, 2021. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, in accordance with firm service contracts. The Company's customers that are charged maximum tariff rates related to its FERC-regulated operating subsidiaries, the amounts below reflect the current tariff rate for such services for the term of the agreements; however, the tariff rates may be subject to future adjustment. The Company has elected to exclude the following from the table: (a) unsatisfied performance obligations from usage fees associated with its firm services because of the stand-ready nature of such services; (b) consideration in contracts that is recognized in revenue as invoiced, such as for interruptible services; and (c) consideration received prior to December 31, 2021, that will be recognized in revenue in future periods, such as the consideration recorded in contract liabilities. The estimated revenues reflected in the table may include estimated revenues that are anticipated under executed precedent transportation agreements for projects that are subject to regulatory approvals.

	In millions
	2022		2023		Thereafter		Total
Estimated revenues from contracts with customers     from unsatisfied performance obligations as of     December 31, 2021	$	1,115.0	$	1,015.0	$	6,704.5	$	8,834.5
Operating revenues which are fixed and     determinable (operating leases)	25.0		25.0		175.5		225.5
Total projected operating revenues under committed     firm agreements as of December 31, 2021	$	1,140.0	$	1,040.0	$	6,880.0	$	9,060.0