Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 0.0	$ 0.0
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value per share	$ 1.25	$ 1.25
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	95,779,719	94,599,742
Common stock, shares outstanding	79,103,450	78,352,333
Treasury stock, shares	16,676,269	16,247,409