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Common Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Movements Of Share Awards
Movements on common share awards during the periods ended September 30, are detailed below:
 
For the nine months ended
September 30, 2019
 
For the nine months ended September 30, 2018
Millions of common shares, except fair values
Time- Vested
 
Performance- Vested
 
Weighted Average Grant Date Fair Value ($)
 
Time- Vested
 
Performance- Vested
Unvested at the beginning of period
12.5

 
0.9

 
31.46

 
12.0

 
0.9

Granted during the period
15.4

 
0.6

 
14.47

 
5.5

 
0.4

Forfeited during the period
(0.5
)
 
—

 
24.01

 
(0.2
)
 
—

Vested and distributed during the period
(8.1
)
 
(0.1
)
 
22.55

 
(4.6
)
 
(0.4
)
Unvested at the end of the period
19.3

 
1.4

 
22.04

 
12.7

 
0.9