Share-based Compensation (Schedule of Stock Award Activity, Options, SARs & PSARs) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Employee Stock Option [Member] | Class A Ordinary Shares [Member]
Number of shares
Options outstanding at beginning of period (in shares)	2,708,445
Options granted (in shares)	78,677
Options cancelled/forfeited (in shares)	(47,205)
Options exercised (in shares)	(618,993)
Options outstanding at end of period (in shares)	2,120,924
Options exercisable at end of period (in shares)	1,212,064
Weighted average exercise price
Options outstanding at beginning of period (in dollars per shares)	$ 16.12
Options granted (in dollars per shares)	$ 42.54
Options cancelled/forfeited (in dollars per share)	$ 22.14
Options exercised (in dollars per shares)	$ 14.90
Options outstanding at end of period (in dollars per shares)	$ 17.33
Options exercisable at end of period (in dollars per shares)	$ 13.83
Weighted average remaining contractual term, in years
Options outstanding at end of period	5 years 9 months 18 days
Options exercisable at end of period	4 years 8 months 12 days
Total intrinsic value of awards exercised (in millions):
Options outstanding at end of period	$ 53.5
Options exercisable at end of period	34.8
Employee Stock Option [Member] | Class C Ordinary Shares [Member]
Number of shares
Options outstanding at beginning of period (in shares)	7,031,369
Options granted (in shares)	157,346
Options cancelled/forfeited (in shares)	(116,915)
Options exercised (in shares)	(1,933,626)
Options outstanding at end of period (in shares)	5,138,174
Options exercisable at end of period (in shares)	2,876,361
Weighted average exercise price
Options outstanding at beginning of period (in dollars per shares)	$ 14.95
Options granted (in dollars per shares)	$ 40.86
Options cancelled/forfeited (in dollars per share)	$ 20.78
Options exercised (in dollars per shares)	$ 12.64
Options outstanding at end of period (in dollars per shares)	$ 16.47
Options exercisable at end of period (in dollars per shares)	$ 13.36
Weighted average remaining contractual term, in years
Options outstanding at end of period	5 years 10 months 24 days
Options exercisable at end of period	4 years 9 months 18 days
Total intrinsic value of awards exercised (in millions):
Options outstanding at end of period	126.2
Options exercisable at end of period	79.5
Stock Appreciation Rights (SARs) [Member] | Class A Ordinary Shares [Member]
Number of shares
Options outstanding at beginning of period (in shares)	4,168,758
Options granted (in shares)	2,192,672
Options cancelled/forfeited (in shares)	(148,111)
Options exercised (in shares)	(284,967)
Options outstanding at end of period (in shares)	5,928,352
Options exercisable at end of period (in shares)	2,333,076
Weighted average exercise price
Options outstanding at beginning of period (in dollars per shares)	$ 24.78
Options granted (in dollars per shares)	$ 40.90
Options cancelled/forfeited (in dollars per share)	$ 30.17
Options exercised (in dollars per shares)	$ 21.12
Options outstanding at end of period (in dollars per shares)	$ 30.77
Options exercisable at end of period (in dollars per shares)	$ 20.71
Weighted average remaining contractual term, in years
Options outstanding at end of period	5 years
Options exercisable at end of period	3 years 4 months 24 days
Total intrinsic value of awards exercised (in millions):
Options outstanding at end of period	69.8
Options exercisable at end of period	50.9
Stock Appreciation Rights (SARs) [Member] | Class C Ordinary Shares [Member]
Number of shares
Options outstanding at beginning of period (in shares)	12,437,530
Options granted (in shares)	4,408,368
Options cancelled/forfeited (in shares)	(435,969)
Options exercised (in shares)	(834,407)
Options outstanding at end of period (in shares)	15,575,522
Options exercisable at end of period (in shares)	6,950,992
Weighted average exercise price
Options outstanding at beginning of period (in dollars per shares)	$ 23.87
Options granted (in dollars per shares)	$ 39.07
Options cancelled/forfeited (in dollars per share)	$ 29.27
Options exercised (in dollars per shares)	$ 20.84
Options outstanding at end of period (in dollars per shares)	$ 28.18
Options exercisable at end of period (in dollars per shares)	$ 20.04
Weighted average remaining contractual term, in years
Options outstanding at end of period	4 years 9 months 18 days
Options exercisable at end of period	3 years 4 months 24 days
Total intrinsic value of awards exercised (in millions):
Options outstanding at end of period	199.9
Options exercisable at end of period	145.8
Performance Stock Appreciation Rights (PSARs) [Member] | Class A Ordinary Shares [Member]
Number of shares
Options outstanding at beginning of period (in shares)	2,817,498
Options granted (in shares)	10,000
Options cancelled/forfeited (in shares)	(10,209)
Options exercised (in shares)	(6,248)
Options outstanding at end of period (in shares)	2,811,041
Options exercisable at end of period (in shares)	7,291
Weighted average exercise price
Options outstanding at beginning of period (in dollars per shares)	$ 35.07
Options granted (in dollars per shares)	$ 43.58
Options cancelled/forfeited (in dollars per share)	$ 35.03
Options exercised (in dollars per shares)	$ 35.03
Options outstanding at end of period (in dollars per shares)	$ 35.10
Options exercisable at end of period (in dollars per shares)	$ 35.03
Weighted average remaining contractual term, in years
Options outstanding at end of period	5 years 8 months 12 days
Options exercisable at end of period	2 years
Total intrinsic value of awards exercised (in millions):
Options outstanding at end of period	20.9
Options exercisable at end of period	0.1
Performance Stock Appreciation Rights (PSARs) [Member] | Class C Ordinary Shares [Member]
Number of shares
Options outstanding at beginning of period (in shares)	8,452,494
Options granted (in shares)	30,000
Options cancelled/forfeited (in shares)	(30,626)
Options exercised (in shares)	(18,744)
Options outstanding at end of period (in shares)	8,433,124
Options exercisable at end of period (in shares)	21,874
Weighted average exercise price
Options outstanding at beginning of period (in dollars per shares)	$ 33.44
Options granted (in dollars per shares)	$ 43.03
Options cancelled/forfeited (in dollars per share)	$ 33.41
Options exercised (in dollars per shares)	$ 33.41
Options outstanding at end of period (in dollars per shares)	$ 33.48
Options exercisable at end of period (in dollars per shares)	$ 33.86
Weighted average remaining contractual term, in years
Options outstanding at end of period	5 years 8 months 12 days
Options exercisable at end of period	2 years
Total intrinsic value of awards exercised (in millions):
Options outstanding at end of period	63.6
Options exercisable at end of period	$ 0.2