CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 44.8	$ 44.3
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, authorized	2,000,000	2,000,000
Preferred stock, Issued	0	0
Common stock, par value	$ 1.25	$ 1.25
Common stock, Authorized	500,000,000	500,000,000
Common stock, Issued	267,000,000	259,000,000
Treasury stock, shares	58,300,000	59,200,000