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OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Other Current Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Provision for Interim Rate Refund $ 11.0 $ 0.0
PSAs 5.9 6.0
Customer Deposits 5.9 7.4
Operating Lease Liabilities 3.4 3.0
Finance Lease Liabilities 0.4 0.4
Other 65.9 75.1
Total Other Current Liabilities $ 92.5 $ 91.9