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Summary of Significant Accounting Policies - Changes in accured sales returns (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance $ 30.3
Ending balance 32.7
Sales Returns  
Changes in Accrued Sales Returns [Roll Forward]  
Beginning balance 30.3
Amounts accrued 61.7
Returns charged to accrual (59.3)
Ending balance $ 32.7