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Certain Balance Sheet Components (Components Of Property And Equipment) (Details) - USD ($)
$ in Millions
Dec. 28, 2018
Dec. 29, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 475.0 $ 424.7
Less: accumulated depreciation (262.1) (250.7)
Total 212.9 174.0 [1]
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 134.2 130.6
Software License Arrangement [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 135.9 124.4
Furniture And Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 31.4 29.3
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 40.7 36.6
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 16.4 32.9
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 106.5 60.9
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 9.9 $ 10.0
[1] See Note 2 for a summary of adjustments