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Summary of Significant Accounting Policies - Changes in Accrued Sales Returns (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in Accrued Sales Returns [Roll Forward]    
Beginning balance $ 30.3 $ 28.5
Amounts accrued 102.1 130.6
Returns charged to accrual (102.4) (128.8)
Ending balance 30.0 30.3
Accrued Liabilities, Current    
Changes in Accrued Sales Returns [Roll Forward]    
Beginning balance 20.0  
Ending balance 19.6 20.0
Other Noncurrent Liabilities    
Changes in Accrued Sales Returns [Roll Forward]    
Beginning balance 10.3  
Ending balance $ 10.4 $ 10.3