v3.3.1.900
Share-based Compensation (Stock Award Activity, RSUs, PGUs and PSUs) (Schedules) (Details) - $ / shares
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
RSUs [Member]      
Weighted average grant-date fair value per share      
Granted (in dollars per shares) $ 40.68 $ 35.74 $ 24.57
RSUs [Member] | Class A Ordinary Shares [Member]      
Number of shares      
Outstanding at beginning of period (in shares) 725,676    
Granted (in shares) 226,069    
Forfeited (in shares) (44,428)    
Released from restrictions (in shares) (342,047)    
Outstanding at end of period (in shares) 565,270 725,676  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 35.48    
Granted (in dollars per shares) 41.77    
Forfeited (in dollars per shares) 33.32    
Released from restrictions (in dollars per shares) 35.07    
Outstanding at end of period (in dollars per shares) $ 38.27 $ 35.48  
Weighted average remaining contractual term, in years      
Outstanding at end of period 4 years 7 months 6 days    
RSUs [Member] | Class C Ordinary Shares [Member]      
Number of shares      
Outstanding at beginning of period (in shares) 1,944,468    
Granted (in shares) 460,866    
Forfeited (in shares) (122,418)    
Released from restrictions (in shares) (895,913)    
Outstanding at end of period (in shares) 1,387,003 1,944,468  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 32.79    
Granted (in dollars per shares) 40.14    
Forfeited (in dollars per shares) 30.93    
Released from restrictions (in dollars per shares) 32.36    
Outstanding at end of period (in dollars per shares) $ 35.59 $ 32.79  
Weighted average remaining contractual term, in years      
Outstanding at end of period 4 years 6 months    
PSUs and PGUs [Member]      
Weighted average grant-date fair value per share      
Granted (in dollars per shares) $ 42.47 $ 34.94 $ 25.09
PSUs and PGUs [Member] | Class A Ordinary Shares [Member]      
Number of shares      
Outstanding at beginning of period (in shares) 924,648    
Granted (in shares) 1,518,276    
Performance adjustment (in shares) (138,668)    
Forfeited (in shares) (40,627)    
Released from restrictions (in shares) (273,936)    
Outstanding at end of period (in shares) 1,989,693 924,648  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 32.05    
Granted (in dollars per shares) 42.74    
Performance adjustment (in dollars per shares) 26.17    
Forfeited (in dollars per shares) 35.77    
Released from restrictions (in dollars per shares) 26.24    
Outstanding at end of period (in dollars per shares) $ 41.34 $ 32.05  
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 9 months 18 days    
PGUs [Member] | Class A Ordinary Shares [Member]      
Number of shares      
Outstanding at beginning of period (in shares) 0    
Granted (in shares) 1,000,000    
Outstanding at end of period (in shares) 1,000,000 0  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 0.00    
Granted (in dollars per shares) 44.55    
Outstanding at end of period (in dollars per shares) $ 44.55 $ 0.00  
Weighted average remaining contractual term, in years      
Outstanding at end of period 2 years 2 months 12 days    
PSUs [Member] | Class C Ordinary Shares [Member]      
Number of shares      
Outstanding at beginning of period (in shares) 2,744,452    
Granted (in shares) 1,048,614    
Performance adjustment (in shares) (416,004)    
Forfeited (in shares) (112,487)    
Released from restrictions (in shares) (821,808)    
Outstanding at end of period (in shares) 2,442,767 2,744,452  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 29.99    
Granted (in dollars per shares) 39.83    
Performance adjustment (in dollars per shares) 24.73    
Forfeited (in dollars per shares) 33.15    
Released from restrictions (in dollars per shares) 24.79    
Outstanding at end of period (in dollars per shares) $ 36.71 $ 29.99  
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 3 months 18 days