Common Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Movements Of Share Awards

Movements on employee common share awards priced in U.S. Dollars during the years ended December 31, are detailed below:

	2020			2019		2018
Millions of common shares, except fair values	Time-Vested	Performance-Vested	Weighted Average Grant Date Fair Value ($)	Time-Vested	Performance-Vested	Time- Vested	Performance-Vested
Unvested at the beginning of year	18.7	1.1	21.94	12.5	0.9	12.0	0.9
Granted during the year (1)	8.8	0.9	14.09	15.5	0.6	5.7	0.4
Forfeited during the year	(0.5)	—	20.91	(0.5)	—	(0.3)	—
Vested and distributed during the year	(8.9)	(0.4)	24.17	(8.8)	(0.4)	(4.9)	(0.4)
Unvested at the end of the year	18.1	1.6	19.11	18.7	1.1	12.5	0.9

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(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.