Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 608.5	$ 500.7
Other operating revenues	10.1	9.8
Total operating revenues	618.6	510.5
Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	631.6	522.9
Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	417.8	380.3
Other operating revenues	5.9	5.4
Total operating revenues	423.7	385.7
Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	199.0	127.9
Other operating revenues	8.9	9.3
Total operating revenues	207.9	137.2
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(8.3)	(7.5)
Other operating revenues	(4.7)	(4.9)
Total operating revenues	(13.0)	(12.4)
Firm Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	546.1	440.2
Firm Service | Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	401.6	362.1
Firm Service | Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	152.8	85.6
Firm Service | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(8.3)	(7.5)
Interruptible Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	13.0	11.9
Interruptible Service | Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	13.0	11.9
Interruptible Service | Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0.0	0.0
Interruptible Service | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0.0	0.0
Other revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	49.4	48.6
Other revenues | Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3.2	6.3
Other revenues | Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	46.2	42.3
Other revenues | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 0.0	$ 0.0