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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 28, 2017
Sep. 28, 2019
Level 2 | Convertible Debt    
Business Acquisition [Line Items]    
Convertible senior notes fair value   $ 529.6
Private Company Acquisition    
Business Acquisition [Line Items]    
Total consideration $ 8.7  
Estimated likelihood of achieving production targets 100.00%  
Acquisition contingencies   $ 3.0
Period following acquisition date 12 months