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
Mar. 31, 2021
Mar. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for doubtful accounts, beginning of period $ 12.9 $ 11.2
Current period bad debt (recoveries) expense (0.3) 2.5
Write-offs, net of recoveries (0.8) (0.3)
Allowance for doubtful accounts, end of period $ 11.8 $ 13.4