Revenues Disaggregation of Revenue (Details) $ in Millions		12 Months Ended
		Dec. 31, 2021 USD ($) segments	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Abstract]
Number of Reportable Segments (in ones) | segments		1
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		$ 1,305.6	$ 1,263.8	$ 1,266.4
Other operating revenues	[1]	34.5	33.8	28.8
Total operating revenues		1,340.1	1,297.6	1,295.2
Letter of Credit Proceeds Recognized into Transportation Revenue			34.4	26.2
Firm Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	[2]	1,247.5	1,211.7	1,228.3
Interruptible Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		32.0	33.2	29.0
Other revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		$ 26.1	$ 18.9	$ 9.1

[1] 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.

[2] 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.