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Debt (Schedule Of Debt) (Detail) - USD ($)
$ in Millions
Sep. 28, 2018
Jun. 29, 2018
Dec. 29, 2017
Nov. 24, 2014
Debt Instrument [Line Items]        
Total debt $ 2,012.7   $ 913.9  
Unamortized discount and issuance costs (14.2)   (4.3)  
Less: Short-term debt 226.1   128.4 [1]  
Long-term debt 1,786.6   785.5 [1]  
Uncommitted Facilities, floating rate        
Debt Instrument [Line Items]        
Total debt 225.8   128.0  
Promissory Notes And Other Debt        
Debt Instrument [Line Items]        
Promissory Notes and Other Debt, Current and Noncurrent 1.1   1.2  
2023 Senior Notes, 4.15%, due June 2023 | Senior Notes        
Debt Instrument [Line Items]        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.15%    
Debt Instrument, Principal 300.0 $ 300.0 0.0  
Total debt 300.0   0.0  
2028 Senior Notes, 4.9%, due June 2028 | Senior Notes        
Debt Instrument [Line Items]        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.90%    
Debt Instrument, Principal 600.0 $ 600.0 0.0  
Total debt $ 600.0   0.0  
2024 Senior Notes, 4.75%, due December 2024 | Senior Notes        
Debt Instrument [Line Items]        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.75%     4.75%
Debt Instrument, Principal $ 400.0   400.0 $ 400.0
Total debt 400.0   400.0  
2014 Credit Facility, floating rate, retired | Revolving Credit Facility        
Debt Instrument [Line Items]        
Total debt 0.0   389.0  
Revolving Credit Facility, due May 2023 | Revolving Credit Facility        
Debt Instrument [Line Items]        
Total debt 0.0   0.0  
Term Loan [Member] | Term Loan, due May 2021 | Revolving Credit Facility        
Debt Instrument [Line Items]        
Total debt $ 500.0   $ 0.0  
[1] See Note 2 for a summary of adjustments