Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 35.3	$ 37.5
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	94,599,742	93,534,866
Common stock, shares outstanding	78,352,333	77,678,984
Treasury stock, shares	16,247,409	15,855,882