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Debt - Bank Credit Lines (Details) - USD ($)
$ in Millions
 4 Months Ended 12 Months Ended
Apr. 18, 2017
Dec. 30, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]      
Weighted average interest rate on borrowings under credit lines at period end (as a percent)   2.27% 1.61%
Revolving credit facility [Member]      
Line of Credit Facility [Line Items]      
Revolving credit facility expiration date   Sep. 22, 2019  
Line of credit facility, amount outstanding     $ 65.0
Revolving credit facility maturing in April 2022 [Member]      
Line of Credit Facility [Line Items]      
Revolving credit facility borrowing capacity $ 750.0    
Revolving credit facility expiration date Apr. 01, 2022    
Line of credit facility, amount outstanding   $ 320.0  
Outstanding letters of credit provided to third parties   11.3  
Revolving Credit Facility maturing in September 2019 [Member]      
Line of Credit Facility [Line Items]      
Extinguishment Of Line of Credit $ 500.0    
Revolving credit facility expiration date Sep. 01, 2019    
Outstanding letters of credit provided to third parties     13.0
Various other short-term bank credit lines [Member]      
Line of Credit Facility [Line Items]      
Line of credit facility, amount outstanding   $ 421.7 $ 372.5