Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 607.7	$ 589.0
Accumulated depreciation	(385.7)	(381.6)
Property, plant and equipment, net	222.0	207.4
Construction in process	144.3	151.0
Total property, plant and equipment, net	366.3	358.4
Land and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	16.8	23.9
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	177.2	169.5
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	343.0	334.1
Office equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 70.7	$ 61.5