Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Consolidated Condensed Balance Sheets [Abstract]
Common stock, shares authorized	250.0	250.0
Common stock, par value	$ 1	$ 1
Common stock , shares issued	103.8	104.1
Common stock share outstanding	92.4	93.5
Unvested restricted common stock included in shares issued and outstanding	0.2	0.5