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Summary of Significant Accounting Policies - Advertising Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Advertising costs $ 21.8 $ 10.9 $ 37.1 $ 22.5