Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Receivables, allowance for doubtful accounts	$ 49.6	$ 62.6
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, authorized	2.0	2.0
Preferred stock, Issued	0	0
Common stock, par value	$ 1.25	$ 1.25
Common stock, Authorized	500.0	500.0
Common stock, Issued	243.0	243.0
Treasury stock, shares	62.6	64.5