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Note 3 - Financing Arrangements (Details Textual) - USD ($)
$ in Millions
Sep. 25, 2018
Dec. 31, 2018
Sep. 24, 2018
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   $ 250.7  
Long-term Debt, Maturities, Repayments of Principal in Year Four   342.5  
Long-term Debt, Maturities, Repayments of Principal in Year Five   307.1  
Long-term Debt, Maturities, Repayments of Principal after Year Five   248.8  
Senior Notes [Member] | Senior Notes, First Issuance [Member]      
Unsecured Debt, Total   $ 250.0  
Debt Instrument, Interest Rate, Stated Percentage   2.40%  
Senior Notes [Member] | Senior Notes, Second Issuance [Member]      
Unsecured Debt, Total   $ 250.0  
Debt Instrument, Interest Rate, Stated Percentage   3.85%  
Senior Notes [Member] | Senior Notes, Third Issuance [Member]      
Unsecured Debt, Total   $ 350.0  
Debt Instrument, Interest Rate, Stated Percentage   3.30%  
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 750.0   $ 500.0
Debt Instrument, Term 5 years    
Line of Credit Facility, Maximum Borrowing Capacity, Optional Increase $ 250.0    
Long-term Line of Credit, Total   $ 309.0  
Debt, Weighted Average Interest Rate   3.47%