Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	$ 2,263.1	$ 1,987.2	$ 1,581.5
Other operating revenues	42.7	40.9	36.2
Total operating revenues	2,305.8	2,028.1	1,617.7
Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	2,356.5	2,077.5	1,647.7
Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,568.2	1,420.6	1,308.1
Other operating revenues	23.3	21.5	6.6
Total operating revenues	1,591.5	1,442.1	1,314.7
Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	728.1	597.6	299.5
Other operating revenues	36.9	37.8	33.5
Total operating revenues	765.0	635.4	333.0
Intrasegment Eliminations
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(33.2)	(31.0)	(26.1)
Other operating revenues	(17.5)	(18.4)	(3.9)
Total operating revenues	(50.7)	(49.4)	(30.0)
Firm Service
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	2,072.5	1,775.5	1,489.7
Firm Service | Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,495.5	1,353.9	1,253.1
Firm Service | Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	609.1	452.6	262.7
Firm Service | Intrasegment Eliminations
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(32.1)	(31.0)	(26.1)
Interruptible Service
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	64.0	59.2	51.6
Interruptible Service | Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	65.1	59.1	51.6
Interruptible Service | Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0.0	0.1	0.0
Interruptible Service | Intrasegment Eliminations
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(1.1)	0.0	0.0
Other revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	126.6	152.5	40.2
Other revenues | Operating Segments | Natural Gas Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	7.6	7.6	3.4
Other revenues | Operating Segments | Natural Gas Liquids Reportable Segment
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	119.0	144.9	36.8
Other revenues | Intrasegment Eliminations
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	$ 0.0	$ 0.0	$ 0.0