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Leases - Lease expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Leases [Abstract]    
Operating lease cost $ 54.7  
Short-term lease cost 5.0  
Amortization of right-of-use assets 5.0  
Interest on lease liabilities 1.3  
Total finance lease cost 6.3  
Sublease income 0.8 $ 0.9
Supplemental Cash Flow Information For Lessee    
Operating cash flows from operating leases 54.0  
Operating cash flows from finance leases 1.2  
Financing cash flows from finance leases 4.4  
Operating leases 28.9  
Finance leases $ 30.6