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Leases - Operating lease liability maturity (Details) - USD ($)
$ in Millions
Sep. 29, 2019
Dec. 31, 2018
Leases [Abstract]    
Remainder of 2019 $ 0.9  
2020 4.1  
2021 3.3  
2022 2.1  
2023 1.4  
2024 1.1  
Thereafter 9.2  
Total lease payments 22.1  
Less amount of lease payments representing interest (6.9)  
Total $ 15.2 $ 18.4