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Note 10 - Debt (Details Textual) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Long-term Debt, Gross   $ 3,150.0
Letters of Credit Outstanding, Amount $ 5.1 5.4
Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 1,000.0  
Line of Credit Facility, Remaining Borrowing Capacity $ 994.9 $ 944.6