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OPERATING REVENUES - DISAGGREGATION OF NATURAL GAS UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) - Revenues from contracts with customers - Utility segment - Transferred over time - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Operating Revenues        
Revenues from contracts with customers $ 406.5 $ 409.6 $ 969.6 $ 907.1
Natural gas        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 64.9 69.0 267.6 226.6
Natural gas | Total retail        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 61.3 57.0 259.1 220.8
Natural gas | Residential        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 39.7 37.1 163.7 139.2
Natural gas | Commercial and industrial        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 21.6 19.9 95.4 81.6
Natural gas | Transportation        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 6.3 6.2 15.1 14.8
Natural gas | Other utility        
Disaggregation of Operating Revenues        
Revenues from contracts with customers $ (2.7) $ 5.8 $ (6.6) $ (9.0)