Earnings Per Share (EPS) (Details) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Apr. 30, 2012 Exchangeable Senior Notes [Member]	Apr. 12, 2012 Exchangeable Senior Notes [Member]
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
Ordinary shares issued, shares, Exchangeable Senior Notes (in millions)			10.8
Incremental Common Shares Attributable To Conversion of Exchangeable Senior Notes				0.5

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6505113

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

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+ Details

- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

+ References

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+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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+ Details