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Note 9 - Fair Value Measurements (Details Textual) - Senior Notes [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Long-term Debt, Total	$ 945.2	$ 1,305.4
Fair Value, Nonrecurring [Member]
Long-term Debt, Total	945.2	944.1
Long-term Debt, Fair Value	$ 1,040.0	$ 1,090.0

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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