CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Trade accounts receivable, allowance for doubtful accounts	$ 6.7	$ 6.3
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, Authorized shares	10	10
Preferred stock, Issued shares	0	0
Common stock, par value	$ 1.25	$ 1.25
Common stock, Authorized shares	300	300
Common stock, Issued shares	189.3	189.3
Common stock, Outstanding shares	121.3	120.4
Treasury stock, shares	67.4	68.3
Stock held by employee benefits trusts, shares	0.6	0.6