Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 7.1	$ 7.2
Accumulated depreciation	$ 310.9	$ 304.0
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)	18,849,456	18,849,456
Common stock, shares outstanding (in shares)	18,631,384	18,631,384