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Sale of Assets - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 20, 2020
USD ($)
headquarters
Jun. 28, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 28, 2020
USD ($)
Jun. 30, 2019
USD ($)
Sale of Assets [Line Items]          
Number of headquarters properties sold | headquarters 3        
Number of headquarters properties | headquarters 4        
Sale leaseback transaction, gross proceeds $ 58.5        
Sale leaseback transaction, net proceeds 55.5        
Properties held-for-sale 23.4        
Gain on sale on properties $ 32.1        
Proceeds from wage subsidy receivables, net of fees and retainers   $ 16.9      
Percentage of receivables held as retainer   5.00%      
Proceeds from sale of assets       $ 55.5 $ 13.8
Gain on sale of assets   $ 0.0 $ 12.3 $ 32.1 $ 12.3
Land          
Sale of Assets [Line Items]          
Proceeds from sale of assets     11.7    
Transfer of customer contracts          
Sale of Assets [Line Items]          
Proceeds from sale of assets     $ 2.1