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Note 16 - Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other comprehensive income (loss), before tax $ 112.3 $ 110.2 $ (187.1)
Other comprehensive income (loss), tax (1.1) (5.2) 8.2
Other comprehensive income (loss), after tax 111.2 105.0 (178.9)
Other comprehensive income (loss), tax 1.1 5.2 (8.2)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Other comprehensive income (loss), before tax 107.9 88.4 (154.1)
Other comprehensive income (loss), tax 0.0 0.0 0.0
Other comprehensive income (loss), after tax 107.9 88.4 (154.1)
Other comprehensive income (loss), tax (0.0) (0.0) 0.0
Pension and Postretirement Adjustment [Member]      
Other comprehensive income (loss), before tax 4.4 21.8 (33.0)
Other comprehensive income (loss), tax (1.1) (5.2) 8.2
Other comprehensive income (loss), after tax 3.3 16.6 (24.8)
Other comprehensive income (loss), before reclassifications, before tax 11.1 26.7 (36.7) [1]
Other comprehensive income (loss), before reclassifications, tax (2.9) (6.4) 9.1
Other comprehensive income (loss), before reclassifications, after tax 8.2 20.3 (27.6)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), before tax (6.7) [1] (4.9) [1] (3.7)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (loss), tax [1] 1.8 1.2 (0.9)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), after tax [1] (4.9) (3.7) (2.8)
Other comprehensive income (loss), tax 1.1 5.2 (8.2)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), before tax 6.7 [1] 4.9 [1] 3.7
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive income (losses), after tax [1] $ 4.9 $ 3.7 $ 2.8
[1] These accumulated other comprehensive loss components, before tax, are included under "Cost of revenues" and "Selling, general and administrative" in our accompanying consolidated statements of operations. These components are also included in the computation of net periodic (benefit) cost (See Note 18. Pension and Postretirement Benefits for additional details).