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Long-term Debt - Liability and Equity Component of Convertible Notes (Details) - USD ($)
$ in Millions
Sep. 27, 2020
Jun. 28, 2020
Liability Component:    
Unamortized discount and issuance costs $ (0.4)  
Convertible Notes    
Liability Component:    
Principal 999.8 $ 999.8
Unamortized discount and issuance costs (206.2) (216.0)
Net carrying amount 793.6 783.8
Equity Component:    
Discount related to value of conversion option 262.3 262.3
Partial extinguishment of 2023 Notes (27.7) (27.7)
Debt issuance costs (6.3) (6.3)
Net carrying amount $ 228.3 $ 228.3