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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at December 31, 2019 $ 140.0
Provision for credit losses 28.8
Provision for credit losses deferred for future recovery or refund 32.8
Write-offs charged against the allowance (52.6)
Recovery of amounts previously written off 15.8
Balance at March 31, 2020 164.8
Wisconsin  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at December 31, 2019 59.9
Provision for credit losses 13.7
Provision for credit losses deferred for future recovery or refund 3.3
Write-offs charged against the allowance (19.7)
Recovery of amounts previously written off 10.5
Balance at March 31, 2020 67.7
Illinois  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at December 31, 2019 75.9
Provision for credit losses 14.4
Provision for credit losses deferred for future recovery or refund 29.5
Write-offs charged against the allowance (31.6)
Recovery of amounts previously written off 4.9
Balance at March 31, 2020 93.1
Other States  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at December 31, 2019 4.1
Provision for credit losses 0.7
Provision for credit losses deferred for future recovery or refund 0.0
Write-offs charged against the allowance (1.3)
Recovery of amounts previously written off 0.4
Balance at March 31, 2020 3.9
Total Utility Operations  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at December 31, 2019 139.9
Provision for credit losses 28.8
Provision for credit losses deferred for future recovery or refund 32.8
Write-offs charged against the allowance (52.6)
Recovery of amounts previously written off 15.8
Balance at March 31, 2020 164.7
Corporate and Other  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at December 31, 2019 0.1
Provision for credit losses 0.0
Provision for credit losses deferred for future recovery or refund 0.0
Write-offs charged against the allowance 0.0
Recovery of amounts previously written off 0.0
Balance at March 31, 2020 $ 0.1