CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Receivables, less allowances	$ 8.6	$ 6.1
Property, plant and equipment, less accumulated depreciation	$ 299.7	$ 279.3
Common stock, par value (in dollars per share)	$ 0.375	$ 0.375
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	18,741,371	18,741,371
Common stock, shares outstanding (in shares)	18,521,485	18,521,485