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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 193.5 $ 199.3
Provision for credit losses 25.9 21.0
Write-offs charged against the allowance (64.9) (53.5)
Recovery of amounts previously written off 19.2 11.4
Balance at end of period 190.7 213.8
Change in allowance for credit losses 2.8 14.5
Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund 17.0 35.6
Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 193.5  
Balance at end of period 190.7  
Wisconsin | Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 77.4 82.0
Provision for credit losses 13.8 11.2
Write-offs charged against the allowance (35.6) (28.9)
Recovery of amounts previously written off 11.7 6.2
Balance at end of period 83.0 90.9
Wisconsin | Public Utilities | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund 15.7 20.4
Illinois | Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 109.7 111.0
Provision for credit losses 15.1 8.5
Write-offs charged against the allowance (28.0) (23.0)
Recovery of amounts previously written off 6.5 4.8
Balance at end of period 104.6 116.5
Illinois | Public Utilities | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund 1.3 15.2
Other States | Public Utilities    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 6.4 6.3
Provision for credit losses (3.0) 1.3
Write-offs charged against the allowance (1.3) (1.6)
Recovery of amounts previously written off 1.0 0.4
Balance at end of period 3.1 6.4
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