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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Regulatory liabilities    
Other current liabilities $ 6.9 $ 1.4
Regulatory liabilities 1,622.6 1,637.4
Total regulatory liabilities 1,629.5 1,638.8
Removal costs    
Regulatory liabilities    
Total regulatory liabilities 748.7 718.1
Income tax related items    
Regulatory liabilities    
Total regulatory liabilities 689.8 716.1
Pension and OPEB benefits    
Regulatory liabilities    
Total regulatory liabilities 141.6 144.4
Electric transmission costs    
Regulatory liabilities    
Total regulatory liabilities 16.5 0.2
Derivatives    
Regulatory liabilities    
Total regulatory liabilities 4.8 39.1
Other, net    
Regulatory liabilities    
Total regulatory liabilities $ 28.1 $ 20.9