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Debt (Schedule Of Debt) (Detail) - USD ($)
$ in Millions
Jun. 29, 2018
Dec. 29, 2017
Nov. 24, 2014
Debt Instrument [Line Items]      
Unamortized discount and issuance costs $ (14.7) $ (4.3)  
Total debt 1,286.6 913.9  
Less: Short-term debt 0.4 128.4 [1]  
Long-term debt 1,286.2 785.5 [1]  
Uncommitted Facilities, floating rate      
Debt Instrument [Line Items]      
Total debt 0.0 128.0  
Promissory Notes And Other Debt      
Debt Instrument [Line Items]      
Promissory Notes and Other Debt, Current and Noncurrent $ 1.3 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 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 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%
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 $ 0.0 $ 0.0  
[1] See Note 2 for a summary of adjustments