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Summary of Significant Accounting Policies - Changes In Accured Sales Returns (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Changes in Accrued Sales Returns [Roll Forward]    
Beginning balance $ 19.6  
Ending balance 23.4  
Sales Returns    
Changes in Accrued Sales Returns [Roll Forward]    
Beginning balance 31.7  
Reclassification and remeasurement of sales return asset under Topic 606   $ 1.7
Amounts accrued 72.5  
Returns charged to accrual (68.4)  
Ending balance 35.8  
Previously Reported | Sales Returns    
Changes in Accrued Sales Returns [Roll Forward]    
Beginning balance $ 30.0