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INCOME TAXES (Components of Income Tax) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
subsidiary
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Current (benefit) expense:        
Federal $ (10.6) $ 140.9 $ 75.8  
Foreign 0.0 (0.3) 0.3  
State 21.4 46.2 88.5  
Total current 10.8 186.8 164.6  
Deferred (benefit) expense:        
Federal (156.6) 387.7 379.9  
Foreign (4.8) 3.1 (0.9)  
State (77.8) 146.2 41.2  
Total deferred (239.2) 537.0 420.2  
Total provision for income taxes $ (228.4) $ 723.8 $ 584.8  
Number of subsidiaries acquired | subsidiary 2      
Deferred tax assets, valuation allowance       $ 308.5
Corporate alternative minimum tax 15.00%      
Percent of excise tax on net stock repurchases, energy-related tax credits and incentives 1.00%