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Debt - Carrying Amounts of the Liability and Equity Components (Details) - USD ($)
$ in Millions
Oct. 03, 2020
Jun. 27, 2020
May 29, 2018
Mar. 03, 2017
Carrying amounts of the liability and equity components:        
Carrying amount of liability component $ 606.6 $ 600.9    
Convertible Notes        
Carrying amounts of the liability and equity components:        
Unamortized discount of liability component (73.7) (79.1)    
Unamortized debt issuance cost (4.7) (5.0)    
Carrying amount of liability component 606.6 600.9    
Carrying amount of equity component 136.8 136.8    
Convertible Notes | 1.00% Senior Convertible Notes        
Carrying amounts of the liability and equity components:        
Principal amount of notes $ 460.0 460.0    
Interest rate on senior convertible notes 1.00%     1.00%
Convertible Notes | 1.75% Senior Convertible Notes        
Carrying amounts of the liability and equity components:        
Principal amount of notes $ 225.0 $ 225.0    
Interest rate on senior convertible notes 1.75%   1.75%