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Equity (Reconciliation of Ordinary Shares) (Details) (Common Stock [Member]) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Common Stock [Member]
December 31, 2011	297.1
Shares issued under incentive plans, net	1.5
March 31, 2012	298.6

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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