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Long-Term Debt - General (Details) - USD ($)
$ in Millions
Sep. 30, 2021
May 17, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Deferred financing costs, current $ 0.6   $ 0.1
Term loan      
Debt Instrument [Line Items]      
Deferred financing costs $ 0.6 $ 0.6