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Summary of Significant Accounting Policies - Accounts Receivable, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable, Net      
Allowance for doubtful accounts $ 0.1 $ 0.0 $ 0.4
Accounts receivable written off 0.0 0.0 $ 0.0
Allowance for expected sales discounts and allowances $ 11.5 $ 8.9  
Revenues | Customer Concentration Risk      
Concentration risk percentage      
Concentration risk percentage 98.00% 97.00% 96.00%
Revenues | Customer Concentration Risk | Customer A      
Concentration risk percentage      
Concentration risk percentage 33.00% 30.00% 29.00%
Revenues | Customer Concentration Risk | Customer B      
Concentration risk percentage      
Concentration risk percentage 33.00% 30.00% 30.00%
Revenues | Customer Concentration Risk | Customer C      
Concentration risk percentage      
Concentration risk percentage 32.00% 37.00% 37.00%
Accounts Receivable, net | Customer Concentration Risk      
Concentration risk percentage      
Concentration risk percentage 97.00% 96.00%  
Accounts Receivable, net | Customer Concentration Risk | Customer A      
Concentration risk percentage      
Concentration risk percentage 46.00% 46.00%  
Accounts Receivable, net | Customer Concentration Risk | Customer B      
Concentration risk percentage      
Concentration risk percentage 24.00% 22.00%  
Accounts Receivable, net | Customer Concentration Risk | Customer C      
Concentration risk percentage      
Concentration risk percentage 27.00% 28.00%