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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 200.6 $ 259.1 $ 198.3 $ 220.1
Provision for credit losses 18.8 15.6 42.1 37.7
Provision for credit losses deferred for future recovery or refund (16.6) (31.1) 4.3 (5.7)
Write-offs charged against the allowance (41.2) (21.1) (98.7) (42.9)
Recovery of amounts previously written off 14.2 9.2 29.8 22.5
Balance at end of period 175.8 231.7 175.8 231.7
Change in allowance for credit losses     22.5  
Utility Operations        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     198.3  
Balance at end of period 175.8   175.8  
Wisconsin | Utility Operations        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 85.7 129.5 84.0 102.1
Provision for credit losses 11.8 9.4 23.6 23.1
Write-offs charged against the allowance (22.1) (16.5) (50.9) (35.0)
Recovery of amounts previously written off 8.0 4.2 17.9 14.1
Balance at end of period 78.0 114.4 78.0 114.4
Wisconsin | Utility Operations | Uncollectible expense        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Provision for credit losses deferred for future recovery or refund (5.4) (12.2) 3.4 10.1
Illinois | Utility Operations        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 107.0 122.0 105.5 111.6
Provision for credit losses 7.1 5.2 18.4 12.3
Write-offs charged against the allowance (17.9) (4.0) (45.2) (6.8)
Recovery of amounts previously written off 6.0 4.7 11.4 7.7
Balance at end of period 91.0 109.0 91.0 109.0
Illinois | Utility Operations | Uncollectible expense        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Provision for credit losses deferred for future recovery or refund (11.2) (18.9) 0.9 (15.8)
Other States | Utility Operations        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 7.9 7.6 8.8 6.4
Provision for credit losses (0.1) 1.0 0.1 2.3
Write-offs charged against the allowance (1.2) (0.6) (2.6) (1.1)
Recovery of amounts previously written off 0.2 0.3 0.5 0.7
Balance at end of period 6.8 8.3 6.8 8.3
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 $ 0.0 $ 0.0