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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Regulatory liabilities    
Other current liabilities $ 5.8 $ 15.6
Regulatory liabilities 1,872.5 1,759.0
Total regulatory liabilities 1,878.3 1,774.6
Removal costs    
Regulatory liabilities    
Total regulatory liabilities 906.9 862.1
Income tax related items    
Regulatory liabilities    
Total regulatory liabilities 649.1 663.5
Pension and OPEB benefits    
Regulatory liabilities    
Total regulatory liabilities 111.2 114.6
Energy costs refundable through rate adjustments    
Regulatory liabilities    
Total regulatory liabilities 69.2 47.2
Earnings sharing mechanisms    
Regulatory liabilities    
Total regulatory liabilities 41.9 29.3
We Power escrowed costs    
Regulatory liabilities    
Total regulatory liabilities 20.1 15.1
Uncollectible expense    
Regulatory liabilities    
Total regulatory liabilities 16.4 0.0
VLC transmission service charge    
Regulatory liabilities    
Total regulatory liabilities 14.7 0.0
Other, net    
Regulatory liabilities    
Total regulatory liabilities $ 48.8 $ 42.8