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Note 10 - Long-term and Short-term Financing Arrangements (Details Textual) - USD ($)
$ in Millions
Apr. 14, 2020
May 02, 2020
Mar. 31, 2020
Jan. 18, 2019
Jan. 17, 2019
Jul. 27, 2015
Senior Notes Due 2023 [Member]            
Senior Notes, Total           $ 200.0
Debt Instrument, Interest Rate, Stated Percentage           6.25%
Senior Notes, Repurchase Price, Change of Control   101.00%        
Revolving Credit Facility [Member]            
Long-term Line of Credit, Total     $ 440.0      
Revolving Credit Facility [Member] | Fourth Amendment to Fourth Amended and Restated Credit Agreement [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 600.0     $ 500.0 $ 600.0  
Line of Credit Facility, Option to Increase, Amount 150.0     $ 250.0    
Line of Credit Facility, Additional Maximum Borrowing Capacity $ 100.0          
Debt Instrument, Increase in Basis Spread on Variable Rate 0.75%          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Increase 0.05%          
Line of Credit Facility, Excess Availability, Percent to Trigger Debt Restrictions   10.00%        
Line of Credit Facility, Excess Availability to Trigger Debt Restrictions   $ 40.0        
Long-term Line of Credit, Total   438.5        
Letters of Credit Outstanding, Amount   11.1        
Line of Credit Facility, Remaining Borrowing Capacity   $ 104.2        
Revolving Credit Facility [Member] | Fourth Amendment to Fourth Amended and Restated Credit Agreement [Member] | Minimum [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.00%