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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	Sep. 28, 2025	Dec. 29, 2024
Goodwill [Line Items]
Gross value	$ 848.3	$ 822.2
Less accumulated impairment	253.3	253.3
Net	595.0	568.9
KGS
Goodwill [Line Items]
Gross value	709.7	683.6
Less accumulated impairment	239.5	239.5
Net	470.2	444.1
US
Goodwill [Line Items]
Gross value	138.6	138.6
Less accumulated impairment	13.8	13.8
Net	$ 124.8	$ 124.8

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