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OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Other Income (Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Other Income (Expense)    
Total Other Income $ 4.6 $ 8.6
Pension and Other Postretirement Benefit Plan Non-Service Credits    
Other Income (Expense)    
Total Other Income 1.8 4.3
Interest and Investment Income    
Other Income (Expense)    
Total Other Income 1.9 1.9
AFUDC - Equity    
Other Income (Expense)    
Total Other Income 1.4 1.2
Other Income (Expense)    
Other Income (Expense)    
Total Other Income $ (0.5) $ 1.2