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Certain Balance Sheet Components (Components Of Net Inventories) (Details) - USD ($)
$ in Millions
Jan. 03, 2020
Dec. 28, 2018
Dec. 29, 2017
Balance Sheet Related Disclosures [Abstract]      
Raw materials $ 95.8 $ 96.2  
Work-in-process 13.2 12.6  
Finished goods 203.1 189.2  
Total inventories 312.1 298.0 $ 264.6
Deferred Costs, Current $ 5.6 $ 7.3