Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 71.7	$ 50.4
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	90,524,360	89,924,378
Common stock, shares outstanding	75,558,544	75,144,784
Treasury stock, shares	14,965,816	14,779,594