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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Movements Of Share Awards
Movements on share awards during the periods ended March 31, are detailed below:
 
For the three months ended March 31, 2017
 
For the three months ended March 31, 2016
Millions of shares, except fair values
Time- Vested
 
Performance- Vested
 
Weighted Average Grant Date Fair Value ($)
 
Time- Vested
 
Performance- Vested
Unvested at the beginning of period
12.1

 
0.8

 
31.22

 
10.4

 
0.6

Granted during the period
5.1

 
0.3

 
32.19

 
6.2

 
0.4

Forfeited during the period
(0.3
)
 
—

 
31.48

 
—

 
—

Vested and distributed during the period
(4.4
)
 
(0.2
)
 
31.33

 
(4.1
)
 
(0.2
)
Unvested at the end of the period
12.5

 
0.9

 
31.57

 
12.5

 
0.8