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Acquisition and disposal related costs - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 15, 2021
Mar. 28, 2021
Mar. 29, 2020
Business Combinations [Abstract]      
Payment for business acquisition $ 19.3    
Acquisition-related costs   $ 0.2 $ 0.2
Acquisition-related costs     0.2
Business combination, contingent consideration deferred     $ 0.1