Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	Jun. 29, 2025	Dec. 29, 2024
Goodwill [Line Items]
Gross value	$ 852.1	$ 822.2
Less accumulated impairment	253.3	253.3
Net	598.8	568.9
KGS
Goodwill [Line Items]
Gross value	713.5	683.6
Less accumulated impairment	239.5	239.5
Net	474.0	444.1
US
Goodwill [Line Items]
Gross value	138.6	138.6
Less accumulated impairment	13.8	13.8
Net	$ 124.8	$ 124.8