Common Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021			For the six months ended June 30, 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	3.4	0.6	22.60	8.1	0.9
Forfeited during the period	(0.2)	—	18.74	(0.2)	—
Vested and distributed during the period	(6.4)	(0.5)	21.85	(6.3)	(0.2)
Unvested at the end of the period	14.9	1.7	18.82	20.3	1.8