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Other charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Dec. 31, 2021
Jun. 27, 2021
Jun. 28, 2020
Other Commitments [Line Items]          
Other charges $ 0.0 $ 0.0   $ (1.1) $ 0.0
Forecast          
Other Commitments [Line Items]          
Other charges     $ 0.0