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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 162.8 $ 193.5
Provision for credit losses 32.6 25.9
Write-offs charged against the allowance (60.1) (64.9)
Recovery of amounts previously written off 29.2 19.2
Balance at end of period 159.4 190.7
Change in allowance for credit losses 3.4 2.8
Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund (5.1) 17.0
Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 162.8  
Balance at end of period 159.4  
Wisconsin | Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 73.6 77.4
Provision for credit losses 16.1 13.8
Write-offs charged against the allowance (33.8) (35.6)
Recovery of amounts previously written off 12.3 11.7
Balance at end of period 60.9 83.0
Wisconsin | Public Utilities | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund (7.3) 15.7
Illinois | Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 83.9 109.7
Provision for credit losses 16.3 15.1
Write-offs charged against the allowance (25.6) (28.0)
Recovery of amounts previously written off 16.4 6.5
Balance at end of period 93.2 104.6
Illinois | Public Utilities | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund 2.2 1.3
Other States | Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 5.3 6.4
Provision for credit losses 0.2 (3.0)
Write-offs charged against the allowance (0.7) (1.3)
Recovery of amounts previously written off 0.5 1.0
Balance at end of period 5.3 3.1
Other States | Public Utilities | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund $ 0.0 $ 0.0