Certain Balance Sheet Components (Components Of Property And Equipment) (Details) - USD ($) $ in Millions	Dec. 29, 2023	Dec. 30, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 553.0	$ 578.5
Less: accumulated depreciation	(350.5)	(359.5)
Total property and equipment, net	202.5	219.0
Land, building, furniture, and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	237.4	244.4
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	170.0	177.6
Software and licenses
Property, Plant and Equipment [Line Items]
Property and equipment, gross	131.6	146.4
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14.0	$ 10.1