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Debt (Narrative) (Detail)
$ in Millions
Nov. 24, 2014
USD ($)
Apr. 01, 2016
USD ($)
Jan. 01, 2016
USD ($)
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.75%  
Debt Instrument, Face Amount $ 400.0    
Total debt   $ 674.9 $ 729.7
Long-term debt   539.6 611.4
Term Loan Repayments of Principal in Year Two   0.3  
Term Loan Repayments of Principal in Year Three   0.2  
Term Loan Repayments of Principal in Year Four   144.2  
2014 Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Term 5 years    
Uncommitted Facilities [Member]      
Debt Instrument [Line Items]      
Total debt   135.0 118.0
Revolving Credit Facility [Member] | 2014 Credit Facility [Member]      
Debt Instrument [Line Items]      
Total debt   144.0 216.0
Promissory Notes And Other Debt [Member]      
Debt Instrument [Line Items]      
Total debt   1.3 1.2
Long-term debt   1.0 0.9
Revolving Credit Facility [Member] | Uncommitted Facilities [Member]      
Debt Instrument [Line Items]      
Short-term Debt   $ 135.0 $ 118.0
Number Of Revolving Loan Facilities   2  
Line of Credit Facility, Current Borrowing Capacity   $ 75.0  
Short-term Debt, Weighted Average Interest Rate   1.37% 1.37%
Revolving Credit Facility [Member] | Unsecured Debt [Member] | 2014 Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity   $ 1,000.0  
Total debt   $ 144.0 $ 216.0
Long-term Debt, Weighted Average Interest Rate   1.66% 1.46%
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member]      
Debt Instrument [Line Items]      
Credit Facilities Aggregate Principal Amount   $ 75.0