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Stockholders' Equity (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 13, 2011	Dec. 31, 2010
Stockholders' Equity
Shares repurchased under stock repurchase program	0.3	1.0
Shares repurchased under stock repurchase program, average price per share	$ 31.68	$ 32.97
Amount available for repurchase under stock repurchase program		$ 23
Common stock, shares authorized	300	300		150
Increase in common stock shares authorized			300

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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