v3.25.2
Reportable Segments (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
segments
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segments     2    
Operating Revenues $ 534.0 $ 477.5 $ 1,152.6 $ 988.0  
Costs associated with service revenues 7.2 6.6 15.2 13.8  
Costs associated with product sales 95.6 78.9 218.5 142.7  
Operation and maintenance 75.0 79.1 133.2 138.0  
Administrative and general 46.5 42.9 94.8 92.2  
Taxes other than income taxes 33.3 28.7 65.6 60.4  
Loss (gain) on sale of assets, impairments and other 0.1 0.0 (0.9) (7.7)  
Miscellaneous other income, net 0.6 0.9 1.8 3.9  
Segment EBITDA 276.9 242.2 628.0 552.5  
Depreciation and amortization 118.9 106.5 224.4 212.0  
Interest expense 39.8 46.9 79.3 90.2  
Interest income (3.0) (8.8) (4.0) (12.5)  
Consolidated income before income taxes 121.2 97.6 328.3 262.8  
Total Assets 9,980.8   9,980.8   $ 9,779.4
Capital expenditures     121.9 196.4  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenue From External Customers 534.0 477.5 1,152.6 988.0  
Intrasegment revenues 12.9 12.3 25.9 24.7  
Operating Revenues 546.9 489.8 1,178.5 1,012.7  
Total Assets 9,029.9   9,029.9   9,118.8
Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Intrasegment revenues 12.9 12.3 25.9 24.7  
Operating Revenues (12.9) (12.3) (25.9) (24.7)  
Natural Gas Reportable Segment          
Segment Reporting Information [Line Items]          
Revenue From External Customers 362.4 318.0 773.1 691.3  
Natural Gas Reportable Segment | Operating Segments          
Segment Reporting Information [Line Items]          
Intrasegment revenues 12.9 12.3 25.9 24.7  
Operating Revenues 375.3 330.3 799.0 716.0  
Costs associated with service revenues 11.5 9.8 23.5 19.8  
Costs associated with product sales 0.0 0.0 0.0 0.0  
Operation and maintenance 62.8 62.4 110.6 108.9  
Administrative and general 44.0 40.9 90.5 88.1  
Taxes other than income taxes 30.3 25.3 59.2 53.6  
Loss (gain) on sale of assets, impairments and other 0.1   (0.9) (7.7)  
Miscellaneous other income, net (0.7) (0.9) (1.8) (3.8)  
Segment EBITDA 227.3 192.8 517.9 457.1  
Total Assets 7,528.8   7,528.8   7,490.1
Capital expenditures     104.7 166.2  
Natural Gas Liquids Reportable Segment          
Segment Reporting Information [Line Items]          
Revenue From External Customers 171.6 159.5 379.5 296.7  
Natural Gas Liquids Reportable Segment | Operating Segments          
Segment Reporting Information [Line Items]          
Operating Revenues 171.6 159.5 379.5 296.7  
Costs associated with service revenues 4.3 4.6 8.6 9.3  
Costs associated with product sales 95.6 78.9 218.5 142.7  
Operation and maintenance 12.2 16.7 22.6 29.1  
Administrative and general 6.8 6.5 13.3 13.5  
Taxes other than income taxes 3.0 3.4 6.4 6.8  
Loss (gain) on sale of assets, impairments and other 0.0   0.0 0.0  
Miscellaneous other income, net 0.1 0.0 0.0 (0.1)  
Segment EBITDA 49.6 $ 49.4 110.1 95.4  
Total Assets $ 1,501.1   1,501.1   $ 1,628.7
Capital expenditures     $ 17.2 $ 30.2