Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	Mar. 27, 2022	Dec. 26, 2021
Goodwill [Line Items]
Gross value	$ 776.2	$ 747.2
Less accumulated impairment	253.3	253.3
Net	522.9	493.9
KGS
Goodwill [Line Items]
Gross value	648.3	619.3
Less accumulated impairment	239.5	239.5
Net	408.8	379.8
US
Goodwill [Line Items]
Gross value	127.9	127.9
Less accumulated impairment	13.8	13.8
Net	$ 114.1	$ 114.1