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Note 10 - Debt (Details Textual) - USD ($)
$ in Millions
1 Months Ended
Nov. 01, 2021
Sep. 30, 2021
Dec. 31, 2020
Long-term Debt, Gross   $ 2,700.0 $ 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   $ 589.9 $ 944.6
Revolving Credit Facility [Member] | Subsequent Event [Member]      
Repayments of Debt $ 20.0