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Note 13 - Stockholders' Equity - Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Balance $ 437.5 $ 373.1 $ 406.1 $ 361.3
Total Other Comprehensive Income (Loss), Net Of Tax (7.5) 11.8 (13.3) 8.3
Balance 443.1 $ 395.3 443.1 $ 395.3
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Balance     (19.1)  
Other comprehensive (loss) income before reclassifications     (13.1)  
Amounts reclassified from accumulated other comprehensive loss     0.0  
Total Other Comprehensive Income (Loss), Net Of Tax     (13.1)  
Balance (32.2)   (32.2)  
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member]        
Balance     (1.7)  
Other comprehensive (loss) income before reclassifications     0.1  
Amounts reclassified from accumulated other comprehensive loss     0.0  
Total Other Comprehensive Income (Loss), Net Of Tax     0.1  
Balance (1.6)   (1.6)  
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]        
Balance     0.7  
Other comprehensive (loss) income before reclassifications     8.1  
Amounts reclassified from accumulated other comprehensive loss     (8.4)  
Total Other Comprehensive Income (Loss), Net Of Tax     (0.3)  
Balance 0.4   0.4  
AOCI Including Portion Attributable to Noncontrolling Interest [Member]        
Balance     (20.1)  
Other comprehensive (loss) income before reclassifications     (4.9)  
Amounts reclassified from accumulated other comprehensive loss     (8.4)  
Total Other Comprehensive Income (Loss), Net Of Tax     (13.3)  
Balance $ (33.4)   $ (33.4)