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Summary of Significant Accounting Policies - Changes in accured sales returns (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance $ 30.3
Ending balance 32.9
Sales Returns  
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance 30.3
Amounts accrued 88.1
Returns charged to accrual (85.5)
Ending balance $ 32.9