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Earnings per share Securities excluded from the computation of diluted earnings per share (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of share options and share-based awards excluded from computation of earnings per share (in shares)	4,540,127	4,774,448	3,731,699
Number of share options and share-based awards unexercised (in shares)	4,540,127	4,774,448	3,731,699
Share options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of share options and share-based awards excluded from computation of earnings per share (in shares)	3,058,300	3,430,800	3,074,450
Share-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of share options and share-based awards excluded from computation of earnings per share (in shares)	1,481,827	1,343,648	657,249

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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