Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 42.2	$ 58.2
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	92,208,247	91,345,451
Common stock, shares outstanding	76,813,013	76,174,025
Treasury stock, shares	15,395,234	15,171,426