Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	Jun. 25, 2023	Dec. 25, 2022
Goodwill [Line Items]
Gross value	$ 811.5	$ 811.5
Less accumulated impairment	253.3	253.3
Net	558.2	558.2
KGS
Goodwill [Line Items]
Gross value	683.6	683.6
Less accumulated impairment	239.5	239.5
Net	444.1	444.1
US
Goodwill [Line Items]
Gross value	127.9	127.9
Less accumulated impairment	13.8	13.8
Net	$ 114.1	$ 114.1