Common Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Movements Of Share Awards

Movements on common share awards during the periods ended March 31, are detailed below:

	For the three months ended March 31, 2021			For the three months ended March 31, 2020
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	18.1	1.6	19.11	18.7	1.1
Granted during the period	3.3	0.6	21.19	7.8	0.9
Forfeited during the period	(0.1)	—	19.21	(0.2)	—
Vested and distributed during the period	(6.1)	(0.5)	22.17	(6.1)	(0.2)
Unvested at the end of the period	15.2	1.7	18.40	20.2	1.8