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Revenues (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

The following table presents the Partnership's revenues disaggregated by type of service for the three months ended March 31, 2019 (in millions):



	For the Three Months Ended March 31,
	2019		2018
Revenues from Contracts with Customers
Firm Service ⁽¹⁾	$	328.8	$	318.9
Interruptible Service	5.8		9.5
Other revenues	4.9		2.7
Total revenues from contracts with customers	339.5		331.1

Other operating revenues⁽²⁾	6.4		4.3
Total Operating Revenues	$	345.9	$	335.4

(1) Revenues earned from contracts with minimum volume commitments (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.

(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 Partnership and do not represent revenues earned from contracts with customers.

Contract Liabilities

Significant changes in the contract liabilities balances during the three months ended March 31, 2019, are as follows (in millions):



	Contract Liabilities
Balance as of December 31, 2018	$	9.2
Revenues recognized that were included in the contract liability balance at the beginning of the period	(0.3		)
Increases due to cash received, excluding amounts recognized as revenues during the period	1.2
Balance as of March 31, 2019	$	10.1

Significant changes in the contract liabilities balances during the three months ended March 31, 2018, are as follows (in millions):



	Contract Liabilities
Balance as of December 31, 2017	$	1.9
Cumulative effect adjustment from the implementation of ASC 606	6.4
Revenues recognized that were included in the contract liability balance at the beginning of the period	(0.5		)
Increases due to cash received, excluding amounts recognized as revenues during the period	0.7
Balance as of March 31, 2018	$	8.5

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 March 31, 2019. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, as in accordance with firm service contracts. Additionally, for the Partnership’s customers that are charged maximum tariff rates related to its Federal Energy Regulatory Commission 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 Partnership 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 are recognized in revenue as invoiced, such as for interruptible services; and (c) consideration that was received prior to March 31, 2019, that will be recognized in future periods, such as 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
	2019		2020		Thereafter		Total

Estimated revenues from contracts with customers from unsatisfied performance obligations as of March 31, 2019	$	1,095.0	$	970.0	$	7,495.0	$	9,560.0
Operating revenues which are fixed and determinable (operating leases)	19.0		21.0		208.0		248.0
Total projected operating revenues under committed firm agreements as of March 31, 2019 ⁽¹⁾	$	1,114.0	$	991.0	$	7,703.0	$	9,808.0

(1) For the 2019 period, $308.7 million represents actual fixed fee revenues recognized for the fulfillment of performance obligations during the three months ended March 31, 2019.