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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 142.2 $ 166.9 $ 162.8 $ 193.5
Provision for credit losses 32.8 23.8 100.8 73.4
Write-offs charged against the allowance (52.9) (46.2) (167.8) (170.4)
Recoveries of amounts previously written off 33.5 17.7 87.1 54.8
Balance at end of period 129.5 155.0 129.5 155.0
Change in allowance for credit losses     33.3 38.5
Uncollectible expense        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Provision for credit losses deferred for future recovery or refund (26.1) (7.2) (53.4) 3.7
Public Utilities        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     162.8  
Balance at end of period 129.5   129.5  
Wisconsin | Public Utilities        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 52.3 68.7 73.6 77.4
Provision for credit losses 21.8 12.6 59.6 36.2
Write-offs charged against the allowance (35.7) (30.8) (108.0) (102.3)
Recoveries of amounts previously written off 11.3 9.6 37.5 31.7
Balance at end of period 48.7 63.9 48.7 63.9
Wisconsin | Public Utilities | Uncollectible expense        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Provision for credit losses deferred for future recovery or refund (1.0) 3.8 (14.0) 20.9
Illinois | Public Utilities        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 84.6 93.2 83.9 109.7
Provision for credit losses 11.6 11.5 41.3 38.8
Write-offs charged against the allowance (12.2) (12.9) (53.5) (63.2)
Recoveries of amounts previously written off 17.7 6.1 44.3 18.8
Balance at end of period 76.6 86.9 76.6 86.9
Illinois | Public Utilities | Uncollectible expense        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Provision for credit losses deferred for future recovery or refund (25.1) (11.0) (39.4) (17.2)
Other States | Public Utilities        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 5.3 5.0 5.3 6.4
Provision for credit losses (0.6) (0.3) (0.1) (1.6)
Write-offs charged against the allowance (5.0) (2.5) (6.3) (4.9)
Recoveries of amounts previously written off 4.5 2.0 5.3 4.3
Balance at end of period 4.2 4.2 4.2 4.2
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 $ 0.0 $ 0.0