Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 37.5	$ 42.2
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	93,534,866	92,208,247
Common stock, shares outstanding	77,678,984	76,813,013
Treasury stock, shares	15,855,882	15,395,234