Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2021
Dec. 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 expense 0.3 6.3
Write-offs, net of recoveries 0.7 (4.6)
Allowance for doubtful accounts, end of period $ 13.9 $ 12.9