CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Per Share data	Sep. 30, 2011	Dec. 31, 2010
Trade accounts receivable, allowance for doubtful accounts	$ 6.2	$ 7.5
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, Authorized shares	10.0	10.0
Preferred stock, Issued shares	0	0
Common stock, par value	$ 1.25	$ 1.25
Common stock, Authorized shares	300.0	300.0
Common stock, Issued shares	189.3	189.3
Common stock, Outstanding shares	121.1	122.6
Treasury stock, shares	66.1	64.6
Stock held by employee benefits trusts, shares	2.1	2.1