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Note 14 - Shareholders' Equity - Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Foreign currency translation adjustments $ (19.1) $ (36.3) $ (31.9)
Pension and postretirement medical benefits 1.7 0.7 0.3
Cash flow hedge 0.7 (1.5) (5.0)
Total Accumulated Other Comprehensive Loss (20.1) (38.5) (37.2)
Balance 361.3 316.3 298.5
Total Other Comprehensive Income (Loss), net of tax 18.4 (1.3) (14.9)
Balance 406.1 361.3 $ 316.3
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]      
Balance (36.3)    
Other comprehensive income (loss) before reclassifications 17.2    
Amounts reclassified from Accumulated Other Comprehensive Loss 0.0    
Total Other Comprehensive Income (Loss), net of tax 17.2    
Balance (19.1) (36.3)  
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member]      
Balance (0.7)    
Other comprehensive income (loss) before reclassifications (1.0)    
Amounts reclassified from Accumulated Other Comprehensive Loss 0.0    
Total Other Comprehensive Income (Loss), net of tax (1.0)    
Balance (1.7) (0.7)  
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]      
Balance (1.5)    
Other comprehensive income (loss) before reclassifications (7.5)    
Amounts reclassified from Accumulated Other Comprehensive Loss 9.7    
Total Other Comprehensive Income (Loss), net of tax 2.2    
Balance 0.7 (1.5)  
AOCI Including Portion Attributable to Noncontrolling Interest [Member]      
Balance (38.5)    
Other comprehensive income (loss) before reclassifications 8.7    
Amounts reclassified from Accumulated Other Comprehensive Loss 9.7    
Total Other Comprehensive Income (Loss), net of tax 18.4    
Balance $ (20.1) $ (38.5)