Earnings Per Share (EPS) (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Basic and Diluted Shares

The following table summarizes the weighted-average number of ordinary shares outstanding for basic and diluted earnings per share calculations for the three months ended March 31:

In millions	2012	2011
Weighted-average number of basic shares	299.2	331.1
Shares issuable under incentive stock plans	2.9	5.6
Exchangeable Senior Notes	10.3	11.8
Weighted-average number of diluted shares	312.4	348.5
Anti-dilutive shares	12.4	1.8