Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 0.8	$ 1.8
Preferred stock, par value	$ 1	$ 1
Preferred stock, authorized	2,500,000	2,500,000
Preferred stock, issued	0	0
Common stock, par value	$ 1	$ 1
Common stock, authorized	300,000,000	300,000,000
Common stock, issued	146,427,550	146,427,550
Common stock in treasury, shares	5,623,525	4,140,424