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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 29, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets    
Gross $ 21.0 $ 21.5
Accumulated amortization (8.0) (7.9)
Net 13.0 13.6
Customer relationships    
Finite-Lived Intangible Assets    
Gross 13.4 13.4
Accumulated amortization (4.8) (4.6)
Net 8.6 8.8
Technology and trading related    
Finite-Lived Intangible Assets    
Gross 7.6 8.1
Accumulated amortization (3.2) (3.3)
Net $ 4.4 $ 4.8