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Debt (Narrative) (Details)
£ in Millions
Jan. 01, 2021
USD ($)
loan
Jan. 01, 2021
GBP (£)
loan
Feb. 24, 2020
GBP (£)
Jan. 03, 2020
USD ($)
Debt Instrument [Line Items]        
Debt outstanding $ 1,291,400,000     $ 1,624,200,000
Uncommitted Revolving Credit Facilities 55 million pounds GBP        
Debt Instrument [Line Items]        
Current borrowing capacity | £   £ 55.0 £ 55.0  
Number of revolving loan facilities | loan 1 1    
Uncommitted Revolving Credit Facilities $75 million        
Debt Instrument [Line Items]        
Current borrowing capacity $ 75,000,000.0      
Number of revolving loan facilities | loan 2 2    
Uncommitted Revolving Credit Facilities 100 million euros        
Debt Instrument [Line Items]        
Current borrowing capacity | £   £ 100.0    
Number of revolving loan facilities | loan 1 1    
Promissory Notes and Other        
Debt Instrument [Line Items]        
Promissory notes and other debt $ 100,000     $ 300,000
Two Thousand Eighteen Credit Facility | JPMorgan Chase Bank | Unsecured Debt | Revolving Credit Facility, due May 2023        
Debt Instrument [Line Items]        
Current borrowing capacity 1,250,000,000      
Two Thousand Eighteen Credit Facility | JPMorgan Chase Bank | Unsecured Debt | Additional Loan Facility        
Debt Instrument [Line Items]        
Current borrowing capacity 500,000,000.0      
Debt outstanding $ 0