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Note 13 - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefit (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Unrecognized tax benefit as of January 1 $ 9.9 $ 11.5 $ 17.4
Gross increase in tax positions in prior period 1.3 0.5 0.6
Gross decrease in tax positions in prior period (0.1) (0.2) (3.3)
Settlements 0.0 0.0 (2.4)
Lapse of statute of limitations (7.7) (1.9) (0.8)
Unrecognized tax benefit as of December 31 $ 3.4 $ 9.9 $ 11.5