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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for doubtful accounts, beginning of period $ 11.2 $ 16.9 $ 12.9 $ 11.2
Current period bad debt expense 1.2 0.2 1.2 7.1
Write-offs, net of recoveries (1.1) (1.3) (2.8) (2.5)
Allowance for doubtful accounts, end of period $ 11.3 $ 15.8 $ 11.3 $ 15.8