Note 7 - Property, Plant and Equipment - Property, Plant and Equipment and Related Accumulated Depreciation, Including Equipment under Finance Leases (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Total Property, Plant and Equipment	$ 431.2	$ 437.5
Less: accumulated depreciation	(258.4)	(252.0)
Property, plant and equipment, net	172.8	185.5
Land [Member]
Total Property, Plant and Equipment	21.7	23.3
Building and Building Improvements [Member]
Total Property, Plant and Equipment	125.7	131.5
Machinery and Equipment [Member]
Total Property, Plant and Equipment	152.6	157.0
Office Equipment [Member]
Total Property, Plant and Equipment	125.2	118.0
Construction in Progress [Member]
Total Property, Plant and Equipment	$ 6.0	$ 7.7