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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period $ 164.7 $ 140.0
Provision for credit losses 22.2 71.3
Provision for credit losses deferred for future recovery or refund (0.7) 34.0
Write-offs charged against the allowance (25.4) (114.6)
Recovery of amounts previously written off 12.5 42.6
Balance at September 30, 2020 173.3 173.3
Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 164.6 139.9
Provision for credit losses 22.1 71.2
Provision for credit losses deferred for future recovery or refund (0.7) 34.0
Write-offs charged against the allowance (25.4) (114.6)
Recovery of amounts previously written off 12.5 42.6
Balance at September 30, 2020 173.1 173.1
Wisconsin | Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 77.9 59.9
Provision for credit losses 14.8 40.8
Provision for credit losses deferred for future recovery or refund 2.5 11.6
Write-offs charged against the allowance (14.5) (52.2)
Recovery of amounts previously written off 7.8 28.4
Balance at September 30, 2020 88.5 88.5
Illinois | Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 82.7 75.9
Provision for credit losses 6.3 28.3
Provision for credit losses deferred for future recovery or refund (3.2) 22.4
Write-offs charged against the allowance (10.0) (59.5)
Recovery of amounts previously written off 4.4 13.1
Balance at September 30, 2020 80.2 80.2
Other States | Utility Operations    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 4.0 4.1
Provision for credit losses 1.0 2.1
Provision for credit losses deferred for future recovery or refund 0.0 0.0
Write-offs charged against the allowance (0.9) (2.9)
Recovery of amounts previously written off 0.3 1.1
Balance at September 30, 2020 4.4 4.4
Corporate and Other    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0.1 0.1
Provision for credit losses 0.1 0.1
Provision for credit losses deferred for future recovery or refund 0.0 0.0
Write-offs charged against the allowance 0.0 0.0
Recovery of amounts previously written off 0.0 0.0
Balance at September 30, 2020 $ 0.2 $ 0.2