Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets
Receivables, allowance (in dollars)	$ 9.5	$ 9.7
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, Authorized shares	5,000,000	5,000,000
Preferred stock, unissued shares	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, Authorized shares	100,000,000	100,000,000
Common stock, issued shares	78,661,248	78,661,248
Common stock, outstanding shares	61,664,813	61,024,932
Treasury, shares	16,467,760	17,011,676