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2412406 - Disclosure - Share-based compensation (Rollforward Of Company's Restricted Stock) (Details)
(http://www.acegroup.com/role/ShareBasedCompensationRollforwardOfCompanysRestrictedStockDetails)
TableSchedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2012-01-01 - 2012-12-31
2011-01-01 - 2011-12-31
2010-01-01 - 2010-12-31
Number of Restricted Stock [Roll Forward]
 
 
 
Number of unvested restricted stock, beginning of period
4,851,490  
5,305,732  
4,873,429  
Number of restricted stock, granted
1,589,178  
1,808,745  
2,461,076  
Number of restricted stock, vested and issued
(1,923,385) 
(1,929,189) 
(1,771,423) 
Number of restricted stock, forfeited
(262,436) 
(333,798) 
(257,350) 
Number of unvested restricted stock, end of period
4,254,847  
 
4,851,490  
 
5,305,732  
 
Weighted-Average Grant-Day Fair Value [Roll Forward]
 
 
 
Weighted average grant-day fair value of unvested restricted stock outstanding, beginning of period (US$ per share)
52.20  
48.74  
48.25  
Weighted average grant-day fair value of restricted stock, granted (US$ per share)
73.46  
60.01  
51.09  
Weighted average grant-day fair value of restricted stock, vested and issued (US$ per share)
52.71  
50.82  
50.79  
Weighted average grant-day fair value of restricted stock, forfeited (US$ per share)
58.40  
47.46  
47.93  
Weighted average grant-day fair value of unvested restricted stock outstanding, end of period (US$ per share)
59.53  
 
52.20  
 
48.74