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Fair Value Measurements (Additional Fair Value Information Relating To Company's Financial Instruments Outstanding) (Detail) - USD ($)
$ in Millions
Sep. 28, 2018
Dec. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, Notes, Credit Facilities $ 2,012.7 $ 913.9
Uncommitted Facilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, Notes, Credit Facilities 225.8 128.0
Long-term Debt, Fair Value 225.8 128.0
Promissory Notes And Other Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Note Payable Fair Value 1.1 1.2
Promissory Notes and Other Debt, Current and Noncurrent 1.1 1.2
2023 Senior Notes | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, Notes, Credit Facilities 300.0 0.0
Note Payable Fair Value 299.6 0.0
2024 Senior Notes | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, Notes, Credit Facilities 400.0 400.0
Note Payable Fair Value 404.4 430.4
2028 Senior Notes | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, Notes, Credit Facilities 600.0 0.0
Note Payable Fair Value 605.0 0.0
2014 Credit Facility, retired | Revolving Credit Facility    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, Notes, Credit Facilities 0.0 389.0
Line of Credit Facility, Fair Value of Amount Outstanding 0.0 $ 389.0
2018 Credit Facility | Term Loan [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, Notes, Credit Facilities 500.0  
Long-term Debt, Fair Value $ 500.0