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Commitments and Contingencies - Leases (Details) - Facilities Vehicles and Equipment [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]      
Lease payments scheduled for 2019 $ 6.6    
Lease payments scheduled for 2020 5.6    
Lease payments scheduled for 2021 4.4    
Lease payments scheduled for 2022 3.7    
Lease payments scheduled for 2023 2.6    
Lease payments scheduled after 2023 15.4    
Lease expense $ 11.5 $ 11.9 $ 11.6