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Capital Stock (Stock Repurchases Pursuant To Board Of Director Authorizations) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Class of Stock [Line Items]
Common shares outstanding	230.5	235.5
Shares repurchased	6.2	0.1	0.1
1997 Authorization [Member]
Class of Stock [Line Items]
Shares repurchased	6.2	0.1	0.1
2007 Authorization [Member]
Class of Stock [Line Items]
Shares repurchased

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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- Definition

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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