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Share-based compensation (Details)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Long-term incentive plan (LTIP)
 
Share-based compensation  
Performance period 3 years
Exception to forfeiture, minimum requisite service period 12 months
Equity and Incentive Plan (EIP)
 
Share-based compensation  
Aggregate shares of issuance of common stock approved by shareholders 4
Shares remaining available for future issuance 3.8
Shares that can be issued upon vesting of outstanding units and achievement of performance goals 2.0
Equity and Incentive Plan (EIP) | Restricted shares
 
Share-based compensation  
The number of equal annual increments for which the awards become unrestricted (in installments) 4
Stock Option and Incentive Plan (SOIP)
 
Share-based compensation  
Outstanding shares 0.2
Period of time from grant date after which awards become unrestricted 4 years
Stock Option and Incentive Plan (SOIP) | Nonqualified stock options (NQSOs)
 
Share-based compensation  
Percentage of award exercisable in installments 25%
Period during which the award vests and becomes exercisable in installments 4 years
Period award expires if not exercised 10 years
Stock Option and Incentive Plan (SOIP) | Stock appreciation rights (SARs)
 
Share-based compensation  
Percentage of award exercisable in installments 25%
Period during which the award vests and becomes exercisable in installments 4 years
Period award expires if not exercised 10 years