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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
Percent of tax benefit received from increases in tax basis paid to stockholders 85.00%  
Unrealized deferred tax asset $ 155.2 $ 278.1
Deferred Tax Assets, Valuation Allowance 358.4 0.0
Payable to related parties pursuant to Tax Receivable Agreement $ 0.0 $ 373.5