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Provisions and other non-current liabilities - Product liability, governmental investigations and other legal matters provision movements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in other provisions [abstract]        
Less current portion   $ 0 $ 0  
Warranty, governmental investigations and other legal proceedings provisions [member]        
Reconciliation of changes in other provisions [abstract]        
January 1   0 42,000 $ 49,000
Additions to provisions $ 8,925 9,000 0 1,000
Cash payments   (9,000) (40,000) (1,000)
Releases   0 (2,000) (7,000)
December 31   0 0 42,000
Less current portion   0 0 (42,000)
Non-current provisions for litigation and other legal matters at December 31   $ 0 $ 0 $ 0