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Summary of Significant Accounting Policies, Reclassifications (Details) - Reclassification Adjustment [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
General and Administration Expenses [Member]    
Reclassifications [Abstract]    
Events and other miscellaneous selling costs $ (4.6) $ (9.5)
Selling Expenses [Member]    
Reclassifications [Abstract]    
Events and other miscellaneous selling costs $ 4.6 $ 9.5