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Note 5 - Debt (Details Textual)
€ in Millions, $ in Millions
25 Months Ended 30 Months Ended
Jan. 16, 2018
USD ($)
Oct. 13, 2017
USD ($)
Mar. 04, 2016
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 30, 2017
Nov. 15, 2017
USD ($)
Oct. 12, 2017
USD ($)
Feb. 15, 2017
USD ($)
Dec. 08, 2016
USD ($)
Dec. 08, 2016
EUR (€)
Euro Senior Notes, Series A and B [Member]                      
Debt Instrument, Face Amount | €                     € 212
Euro Senior Notes, Series A [Member]                      
Debt Instrument, Face Amount                   $ 117.0  
Debt Instrument, Interest Rate, Stated Percentage                   1.14% 1.14%
Euro Senior Notes, Series B [Member]                      
Debt Instrument, Face Amount | €                     € 95
Debt Instrument, Interest Rate, Stated Percentage                   1.83% 1.83%
U.S. Senior Notes, Series A and B [Member]                      
Debt Instrument, Face Amount                   $ 125.0  
U.S. Senior Notes, Series A [Member]                      
Debt Instrument, Face Amount                 $ 25.0    
Debt Instrument, Interest Rate, Stated Percentage                 3.03%    
U.S. Senior Notes, Series B [Member]                      
Debt Instrument, Face Amount                 $ 100.0    
Debt Instrument, Interest Rate, Stated Percentage                 3.74%    
US Senior Notes A and B Due 2025 and 2030 [Member]                      
Debt Instrument, Face Amount             $ 175.0        
US Senior Notes, Series A Due 2025 [Member]                      
Debt Instrument, Face Amount $ 50.0                    
Debt Instrument, Interest Rate, Stated Percentage 3.48%                    
US Senior Notes, Series B Due 2030 [Member]                      
Debt Instrument, Face Amount $ 125.0                    
Debt Instrument, Interest Rate, Stated Percentage 3.78%                    
Credit Agreement [Member]                      
Debt Instrument, Term     5 years                
Debt Agreement, Maximum Borrowing Capacity     $ 700.0                
Line of Credit Facility, Additional Uncommitted Borrowing Capacity   $ 300.0 150.0                
Line of Credit Facility, Additional Uncommitted Borrowing Capacity, Minimum Increments     $ 25.0                
Number of Advances   2                  
Debt Instrument, Interest Rate, Effective Percentage       3.13%              
Letters of Credit Outstanding, Amount       $ 0.1              
Credit Agreement [Member] | Minimum [Member]                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.15%                
Credit Agreement [Member] | Maximum [Member]                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%                
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                      
Debt Instrument, Basis Spread on Variable Rate     1.00%                
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                      
Debt Instrument, Basis Spread on Variable Rate     2.00%                
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]                      
Debt Instrument, Basis Spread on Variable Rate     0.00%                
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]                      
Debt Instrument, Basis Spread on Variable Rate     1.00%                
Credit Agreement [Member] | Revolving Credit Facility [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity   $ 700.0 $ 575.0         $ 575.0      
Line of Credit Facility, Remaining Borrowing Capacity       696.9              
Credit Agreement [Member] | Term Loan Credit Facility [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity   200.0 $ 125.0         $ 125.0      
Line of Credit Facility, Periodic Payment, Principal       $ 1.6              
Proceeds from Issuance of Long-term Debt, Total $ 75.0 $ 125.0                  
Debt Instrument, Quarterly Payments, Percentage of Loan           1.25%          
Debt Instrument, Periodic Payment, Total $ 2.5                    
Credit Agreement [Member] | Term Loan Credit Facility [Member] | Scenario, Forecast [Member]                      
Line of Credit Facility, Periodic Payment, Principal         $ 3.1