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Share-based Compensation (Other than Options Award Activity) (Details) - $ / shares
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]    
Weighted average grant-date fair value per share of awards granted:    
Granted (in dollars per shares) $ 51.97 $ 39.72
Restricted Stock Units (RSUs) [Member] | Class A Ordinary Shares [Member]    
Number of shares    
Outstanding at beginning of period (in shares) 565,270  
Granted (in shares) 298,713  
Forfeited (in shares) (18,827)  
Released from restrictions (in shares) (299,372)  
Outstanding at end of period (in shares) 545,784  
Weighted average grant-date fair value per share of awards granted:    
Outstanding at beginning of period (in dollars per shares) $ 38.27  
Granted (in dollars per shares) 53.11  
Forfeited (in dollars per shares) 37.52  
Released from restrictions (in dollars per shares) 37.65  
Outstanding at end of period (in dollars per shares) $ 46.76  
Weighted average remaining contractual term, in years    
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms 3 years 3 months 18 days  
Restricted Stock Units (RSUs) [Member] | Class C Ordinary Shares [Member]    
Number of shares    
Outstanding at beginning of period (in shares) 1,387,003  
Granted (in shares) 597,426  
Forfeited (in shares) (45,611)  
Released from restrictions (in shares) (553,929)  
Outstanding at end of period (in shares) 1,384,889  
Weighted average grant-date fair value per share of awards granted:    
Outstanding at beginning of period (in dollars per shares) $ 35.59  
Granted (in dollars per shares) 51.40  
Forfeited (in dollars per shares) 34.70  
Released from restrictions (in dollars per shares) 34.55  
Outstanding at end of period (in dollars per shares) $ 42.85  
Weighted average remaining contractual term, in years    
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms 3 years 8 months 12 days  
PSUs / PGUs [Member]    
Weighted average grant-date fair value per share of awards granted:    
Granted (in dollars per shares) $ 51.69 $ 40.41
PSUs / PGUs [Member] | Class A Ordinary Shares [Member]    
Number of shares    
Outstanding at beginning of period (in shares) 1,989,693  
Granted (in shares) 410,716  
Performance adjustment (in shares) 50,410  
Forfeited (in shares) (22,619)  
Released from restrictions (in shares) (543,707)  
Outstanding at end of period (in shares) 1,884,493  
Weighted average grant-date fair value per share of awards granted:    
Outstanding at beginning of period (in dollars per shares) $ 41.34  
Granted (in dollars per shares) 52.82  
Performance adjustment (in dollars per shares) 37.31  
Forfeited (in dollars per shares) 38.47  
Released from restrictions (in dollars per shares) 41.12  
Outstanding at end of period (in dollars per shares) $ 43.84  
Weighted average remaining contractual term, in years    
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms 1 year 6 months  
PSUs / PGUs [Member] | Class B Ordinary Shares [Member]    
Number of shares    
Outstanding at beginning of period (in shares) 1,000,000  
Released from restrictions (in shares) (333,333)  
Outstanding at end of period (in shares) 666,667  
Weighted average grant-date fair value per share of awards granted:    
Outstanding at beginning of period (in dollars per shares) $ 44.55  
Released from restrictions (in dollars per shares) 44.55  
Outstanding at end of period (in dollars per shares) $ 44.55  
Weighted average remaining contractual term, in years    
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms 1 year 8 months 12 days  
PSUs / PGUs [Member] | Class C Ordinary Shares [Member]    
Number of shares    
Outstanding at beginning of period (in shares) 2,442,767  
Granted (in shares) 821,432  
Performance adjustment (in shares) 147,179  
Forfeited (in shares) (58,997)  
Released from restrictions (in shares) (614,341)  
Outstanding at end of period (in shares) 2,738,040  
Weighted average grant-date fair value per share of awards granted:    
Outstanding at beginning of period (in dollars per shares) $ 36.71  
Granted (in dollars per shares) 51.12  
Performance adjustment (in dollars per shares) 34.80  
Forfeited (in dollars per shares) 36.02  
Released from restrictions (in dollars per shares) 34.80  
Outstanding at end of period (in dollars per shares) $ 41.38  
Weighted average remaining contractual term, in years    
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms 1 year 3 months 18 days