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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for doubtful accounts, beginning of period $ 14.9 $ 11.8 $ 13.9 $ 12.9
Current period bad debt expense 1.8 0.3 3.0 0.0
Write-offs, net of recoveries (1.1) (0.9) (1.3) (1.7)
Allowance for doubtful accounts, end of period $ 15.6 $ 11.2 $ 15.6 $ 11.2