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Summary of Significant Accounting Policies - Changes In Accured Sales Returns (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance $ 22.0
Ending balance 27.2
Sales Returns  
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance 34.3
Amounts accrued 81.5
Returns charged to accrual (76.0)
Ending balance $ 39.8