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Note 11 - Stockholders' Equity - Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Other comprehensive income (loss), before tax $ 116.7 $ (86.1) $ (52.9) $ (85.8)
Other comprehensive income (loss), tax (0.4) (0.1) (1.1) (0.7)
Other comprehensive income (loss), after tax 116.3 (86.2) (54.0) (86.5)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Other comprehensive income (loss), before tax 115.0 (87.3) (57.7) (89.7)
Other comprehensive income (loss), tax 0.0 0.0 0.0 0.0
Other comprehensive income (loss), after tax 115.0 (87.3) (57.7) (89.7)
Pension and Postretirement Adjustment [Member]        
Other comprehensive income (loss), before tax 1.7 1.2 4.8 3.9
Other comprehensive income (loss), tax (0.4) (0.1) (1.1) (0.7)
Other comprehensive income (loss), after tax 1.3 1.1 3.7 3.2
Other comprehensive income (loss), before reclassifications, before tax 3.5 2.0 9.7 7.7
Other comprehensive income (loss), before reclassifications, tax (0.8) (0.3) (2.3) (1.6)
Other comprehensive income (loss), before reclassifications, after tax 2.7 1.7 7.4 6.1
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), before tax [1] (1.8) (0.8) (4.9) (3.8)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (loss)es, tax [1] 0.4 0.2 1.2 0.9
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), after tax [1] $ (1.4) $ (0.6) $ (3.7) $ (2.9)
[1] These accumulated other comprehensive loss components, before tax, are included under "Cost of revenues" and "Selling, general and administrative" in the accompanying condensed consolidated statements of operations. These components are also included in the computation of net periodic (benefit) cost (see Note 12. Pension and Postretirement Benefits for additional details).