Share-based Compensation (Stock Award Activity, Options, SARs & PSARs) (Schedules) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Options [Member] | Class A ordinary shares, $0.01 nominal value. Issued and outstanding 251,167,686 and 222,081,117 shares, respectively
Number of shares
Options outstanding at beginning of period (in shares)	2,708,445
Options granted (in shares)	78,677
Options expired, cancelled or forfeited (in shares)	(51,826)
Options exercised (in shares)	(1,009,037)
Options outstanding at end of period (in shares)	1,726,259
Options exercisable at end of period (in shares)	1,125,619
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 expired or cancelled (in dollars per shares)	$ 22.49
Options exercised (in dollars per shares)	$ 14.61
Options outstanding at end of period (in dollars per shares)	$ 18.01
Options exercisable at end of period (in dollars per shares)	$ 13.84
Weighted average remaining contractual term, in years
Options outstanding at end of period	5 years 4 months 24 days
Options exercisable at end of period	4 years 6 months
Aggregate intrinsic value
Options outstanding at end of period	$ 55.6
Options exercisable at end of period	40.9
Options [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 expired, cancelled or forfeited (in shares)	(128,419)
Options exercised (in shares)	(3,114,104)
Options outstanding at end of period (in shares)	3,946,192
Options exercisable at end of period (in shares)	2,452,721
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 expired or cancelled (in dollars per shares)	$ 21.13
Options exercised (in dollars per shares)	$ 12.54
Options outstanding at end of period (in dollars per shares)	$ 17.67
Options exercisable at end of period (in dollars per shares)	$ 13.72
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	4 years 9 months 18 days
Aggregate intrinsic value
Options outstanding at end of period	120.9
Options exercisable at end of period	84.8
SARs [Member] | Class A ordinary shares, $0.01 nominal value. Issued and outstanding 251,167,686 and 222,081,117 shares, respectively
Number of shares
Options outstanding at beginning of period (in shares)	4,168,758
Options granted (in shares)	2,192,672
Options expired, cancelled or forfeited (in shares)	(203,409)
Options exercised (in shares)	(550,033)
Options outstanding at end of period (in shares)	5,607,988
Options exercisable at end of period (in shares)	2,527,237
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 expired or cancelled (in dollars per shares)	$ 32.22
Options exercised (in dollars per shares)	$ 21.97
Options outstanding at end of period (in dollars per shares)	$ 31.07
Options exercisable at end of period (in dollars per shares)	$ 23.25
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 7 months 6 days
Aggregate intrinsic value
Options outstanding at end of period	107.3
Options exercisable at end of period	68.1
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 expired, cancelled or forfeited (in shares)	(566,688)
Options exercised (in shares)	(1,590,165)
Options outstanding at end of period (in shares)	14,689,045
Options exercisable at end of period (in shares)	7,308,864
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 expired or cancelled (in dollars per shares)	$ 22.52
Options exercised (in dollars per shares)	$ 20.92
Options outstanding at end of period (in dollars per shares)	$ 28.49
Options exercisable at end of period (in dollars per shares)	$ 21.95
Weighted average remaining contractual term, in years
Options outstanding at end of period	4 years 6 months
Options exercisable at end of period	3 years 6 months
Aggregate intrinsic value
Options outstanding at end of period	291.2
Options exercisable at end of period	192.7
PSARs [Member] | Class A ordinary shares, $0.01 nominal value. Issued and outstanding 251,167,686 and 222,081,117 shares, respectively
Number of shares
Options outstanding at beginning of period (in shares)	2,817,498
Options granted (in shares)	10,000
Options expired, cancelled or forfeited (in shares)	(29,376)
Options exercised (in shares)	(9,373)
Options outstanding at end of period (in shares)	2,788,749
Options exercisable at end of period (in shares)	7,499
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 expired or cancelled (in dollars per shares)	$ 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 6 months
Options exercisable at end of period	1 year 9 months 18 days
Aggregate intrinsic value
Options outstanding at end of period	42.1
Options exercisable at end of period	0.1
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 expired, cancelled or forfeited (in shares)	(88,127)
Options exercised (in shares)	(28,119)
Options outstanding at end of period (in shares)	8,366,248
Options exercisable at end of period (in shares)	22,498
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 expired or cancelled (in dollars per shares)	$ 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)	$ 33.41
Weighted average remaining contractual term, in years
Options outstanding at end of period	5 years 6 months
Options exercisable at end of period	1 year 9 months 18 days
Aggregate intrinsic value
Options outstanding at end of period	124.1
Options exercisable at end of period	$ 0.3