Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Rollforward of Allowance for Doubtful Accounts (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Rollforward of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                
Allowance for doubtful accounts, beginning of period $ 16.9 $ 13.3 $ 16.9 $ 13.3 $ 13.4 $ 11.2 $ 12.5 $ 10.9
Current period bad debt expense 4.4 1.7 6.9 3.7        
Write-offs, net of recoveries $ (0.9) $ (0.9) $ (1.2) $ (1.3)