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Fair Value of Financial Instruments - Fair values of other financial instruments (Details) - USD ($)
$ in Millions
Apr. 03, 2021
Jan. 02, 2021
Jun. 01, 2020
Mar. 06, 2017
0.625% Convertible Senior Notes (2025 Notes)        
Fair values of other financial instruments        
Interest rate (as a percent) 0.625%   0.625%  
Fair value of debt $ 691.2 $ 671.4    
1.375% Convertible Senior Notes (2022 Notes)        
Fair values of other financial instruments        
Interest rate (as a percent)       1.375%