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Common Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Movements Of Share Awards
Movements on common share awards during the periods ended June 30, are detailed below:
 
For the six months ended
June 30, 2020
 
For the six months ended June 30, 2019
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
18.7

 
1.1

 
21.94

 
12.5

 
0.9

Granted during the period(1)
8.1

 
0.9

 
14.09

 
15.0

 
0.6

Forfeited during the period
(0.2
)
 
—

 
21.93

 
(0.4
)
 
—

Vested and distributed during the period
(6.3
)
 
(0.2
)
 
25.38

 
(6.6
)
 
(0.1
)
Unvested at the end of the period
20.3

 
1.8

 
19.51

 
20.5

 
1.4


(1) With respect to the time-vested awards granted in 2019, includes 6.2 million restricted shares as employment inducement
awards in connection with completed acquisitions.