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Summary of Significant Accounting Policies - Changes In Accured Sales Returns (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance $ 22.0
Ending balance 24.6
Sales Returns  
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance 34.3
Amounts accrued 52.0
Returns charged to accrual (49.4)
Ending balance $ 36.9