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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Regulatory liabilities    
Other current liabilities $ 32.5 $ 47.5
Regulatory liabilities 3,889.1 3,697.7
Total regulatory liabilities 3,921.6 3,745.2
Income tax related items    
Regulatory liabilities    
Total regulatory liabilities 1,838.0 1,901.8
Removal costs    
Regulatory liabilities    
Total regulatory liabilities 1,429.5 1,329.9
Pension and OPEB benefits    
Regulatory liabilities    
Total regulatory liabilities 301.2 299.2
Energy costs refundable through rate adjustments    
Regulatory liabilities    
Total regulatory liabilities 126.0 72.4
Uncollectible expense    
Regulatory liabilities    
Total regulatory liabilities 39.2 21.2
Paris    
Regulatory liabilities    
Total regulatory liabilities 31.8 0.0
Derivatives    
Regulatory liabilities    
Total regulatory liabilities 29.1 19.2
Electric transmission costs    
Regulatory liabilities    
Total regulatory liabilities 20.5 30.3
Energy efficiency programs    
Regulatory liabilities    
Total regulatory liabilities 16.7 17.2
Other, net    
Regulatory liabilities    
Total regulatory liabilities $ 89.6 $ 54.0