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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Allowance for credit loss $ 7.2 $ 6.1
Accumulated depreciation $ 304.0 $ 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) 18,631,384 18,631,384
Common stock, shares outstanding (in shares) 18,521,485 18,521,485