Share-Based Compensation (Movements On Share Awards Priced In U.S. Dollars) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Vested and distributed during the period, Weighted Average Grant Date Fair Value	$ 19.93
Time Vested N y s e [Member]
Unvested at the beginning of period	16.5	17.3
Granted during the period	5.2	5.5
Forfeited during the period	(0.4)	(0.3)
Vested and distributed during the period	(6.6)	(5.6)
Unvested at the end of the period	14.7	16.9
Performance Shares [Member]
Unvested at the beginning of period	0.3	0
Granted during the period	0.2	0.3
Forfeited during the period	0	0
Vested and distributed during the period	(0.1)	0
Unvested at the end of the period	0.4	0.3
Weighted Average Grant Date Fair Value $ [Member]
Unvested at the beginning of period, Weighted Average Grant Date Fair Value	$ 22.36	$ 20.34
Granted during period, Weighted Average Grant Date Fair Value	$ 26.86	$ 24.84
Forfeited during the period, Weighted Average Grant Date Fair Value	$ 24.46	$ 21.07
Vested and distributed during the period, Weighted Average Grant Date Fair Value		$ 18.87
Unvested at the end of the period, Weighted Average Grant Date Fair Value	$ 24.99	$ 22.31