Share-based Compensation (Other than Options Award Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
Weighted average grant-date fair value per share of awards granted:
Granted (in dollars per shares)	$ 39.77	$ 35.74
Restricted Stock Units (RSUs) [Member] | Class A Ordinary Shares [Member]
Number of shares
Outstanding at beginning of period (in shares)	725,676
Granted (in shares)	207,408
Forfeited (in shares)	(39,038)
Released from restrictions (in shares)	(269,816)
Outstanding at end of period (in shares)	624,230
Weighted average grant-date fair value per share of awards granted:
Outstanding at beginning of period (in dollars per shares)	$ 35.48
Granted (in dollars per shares)	$ 40.98
Forfeited (in dollars per shares)	$ 32.53
Released from restrictions (in dollars per shares)	$ 34.66
Outstanding at end of period (in dollars per shares)	$ 37.72
Weighted average remaining contractual term, in years
Outstanding at end of period	4 years 9 months 18 days
Restricted Stock Units (RSUs) [Member] | Class C Ordinary Shares [Member]
Number of shares
Outstanding at beginning of period (in shares)	1,944,468
Granted (in shares)	414,816
Forfeited (in shares)	(110,193)
Released from restrictions (in shares)	(721,392)
Outstanding at end of period (in shares)	1,527,699
Weighted average grant-date fair value per share of awards granted:
Outstanding at beginning of period (in dollars per shares)	$ 32.79
Granted (in dollars per shares)	$ 39.17
Forfeited (in dollars per shares)	$ 30.31
Released from restrictions (in dollars per shares)	$ 31.96
Outstanding at end of period (in dollars per shares)	$ 34.98
Weighted average remaining contractual term, in years
Outstanding at end of period	4 years 8 months 12 days
PSUs / PGUs [Member]
Weighted average grant-date fair value per share of awards granted:
Granted (in dollars per shares)	$ 42.47	$ 34.94
PSUs / 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)	(21,564)
Released from restrictions (in shares)	(273,570)
Outstanding at end of period (in shares)	2,009,122
Weighted average grant-date fair value per share of awards granted:
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)	$ 32.89
Released from restrictions (in dollars per shares)	$ 26.23
Outstanding at end of period (in dollars per shares)	$ 41.32
Weighted average remaining contractual term, in years
Outstanding at end of period	2 years
PSUs / PGUs [Member] | Class B 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
Weighted average grant-date fair value per share of awards granted:
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
Weighted average remaining contractual term, in years
Outstanding at end of period	2 years 6 months
PSUs / PGUs [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)	(64,692)
Released from restrictions (in shares)	(820,710)
Outstanding at end of period (in shares)	2,491,660
Weighted average grant-date fair value per share of awards granted:
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)	$ 30.77
Released from restrictions (in dollars per shares)	$ 24.78
Outstanding at end of period (in dollars per shares)	$ 36.70
Weighted average remaining contractual term, in years
Outstanding at end of period	1 year 6 months