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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent (Details) - Narrative
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock Compensation Plan Member
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 8.8 9.0 9.7 17.3
10.75% Equity Security Units Member
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       30.5
Interest rate on Equity Security Units     10.75%