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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | Sep. 26, 2021 | Dec. 27, 2020
--- | --- | ---
Goodwill [Line Items] |  |
Gross value | $ 737.0 | $ 737.2
Less accumulated impairment | 253.3 | 253.3
Net | 483.7 | 483.9
KGS |  |
Goodwill [Line Items] |  |
Gross value | 609.6 | 609.6
Less accumulated impairment | 239.5 | 239.5
Net | 370.1 | 370.1
US |  |
Goodwill [Line Items] |  |
Gross value | 127.4 | 127.6
Less accumulated impairment | 13.8 | 13.8
Net | $ 113.6 | $ 113.8

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