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Share-Based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2021
Share-Based Payment Arrangements [Abstract]  
Number of share awards outstanding The number of share awards outstanding is detailed below:
(000s)Number of
 restricted awards		Number of
 performance awards		Total number of
 share awards
Balance, December 31, 20193,801 3,135 6,936 
Granted2,239 3,253 5,492 
Vested and converted to common shares(1,730)(1,192)(2,922)
Forfeited(188)(1,108)(1,296)
Balance, December 31, 20204,122 4,088 8,210 
Granted— 4,067 4,067 
Added by performance factor— 669 669 
Vested and converted to common shares(1,861)(1,152)(3,013)
Forfeited(168)(291)(459)
Balance, December 31, 20212,093 7,381 9,474