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Summary of Significant Accounting Policies - Changes In Accured Sales Returns (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance $ 26.2
Ending balance 27.9
Sales Returns  
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance 39.3
Amounts accrued 51.3
Returns charged to accrual (49.3)
Ending balance $ 41.3