Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	Dec. 26, 2021	Dec. 27, 2020
Goodwill [Line Items]
Gross value	$ 747.2	$ 737.2
Less accumulated impairment	253.3	253.3
Net	493.9	483.9
US
Goodwill [Line Items]
Gross value	127.9	127.6
Less accumulated impairment	13.8	13.8
Net	114.1	113.8
KGS
Goodwill [Line Items]
Gross value	619.3	609.6
Less accumulated impairment	239.5	239.5
Net	$ 379.8	$ 370.1