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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 199.3 $ 198.3
Provision for credit losses 21.0 23.3
Write-offs charged against the allowance (53.5) (57.5)
Recovery of amounts previously written off 11.4 15.6
Balance at end of period 213.8 200.6
Change in allowance for credit losses 14.5 2.3
Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund 35.6 20.9
Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 199.3  
Balance at end of period 213.8  
Wisconsin | Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 82.0 84.0
Provision for credit losses 11.2 11.8
Write-offs charged against the allowance (28.9) (28.8)
Recovery of amounts previously written off 6.2 9.9
Balance at end of period 90.9 85.7
Wisconsin | Utility Operations | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund 20.4 8.8
Illinois | Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 111.0 105.5
Provision for credit losses 8.5 11.3
Write-offs charged against the allowance (23.0) (27.3)
Recovery of amounts previously written off 4.8 5.4
Balance at end of period 116.5 107.0
Illinois | Utility Operations | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund 15.2 12.1
Other States | Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period 6.3 8.8
Provision for credit losses 1.3 0.2
Write-offs charged against the allowance (1.6) (1.4)
Recovery of amounts previously written off 0.4 0.3
Balance at end of period 6.4 7.9
Other States | Utility Operations | Uncollectible expense    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Provision for credit losses deferred for future recovery or refund $ 0.0 $ 0.0