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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent - Narrative (Details) (Share-based compensation plans)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based compensation plans
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (shares) 6.0 8.6 6.3 8.8