CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Equity:
Preferred stock, shares authorized (in shares)	3.0	3.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	50.0	50.0
Common stock, shares issued (in shares)	34.3	34.3
Common stock, shares outstanding (in shares)	33.7	33.3
Treasury stock, at cost (in shares)	0.6	1.0