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, 2020	Dec. 31, 2019
Total Property, Plant and Equipment	$ 437.5	$ 412.5
Less: Accumulated Depreciation	(252.0)	(239.2)
Property, Plant and Equipment, Net	185.5	173.3
Land [Member]
Total Property, Plant and Equipment	23.3	19.2
Building and Building Improvements [Member]
Total Property, Plant and Equipment	131.5	98.7
Machinery and Equipment [Member]
Total Property, Plant and Equipment	157.0	165.2
Office Equipment [Member]
Total Property, Plant and Equipment	118.0	107.2
Construction in Progress [Member]
Total Property, Plant and Equipment	$ 7.7	$ 22.2