XML 127 R102.htm IDEA: XBRL DOCUMENT v3.20.1
SHARE-BASED PAYMENTS - Deferred share unit plan (Details) - Deferred share unit plan
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
EquityInstruments
$ / shares
Dec. 31, 2018
USD ($)
EquityInstruments
$ / shares
Share-based payment transaction    
Minimum percentage of compensation for computing number of share units to outside director (as a percent) 50.00%  
DSUs granted 269,000 312,000
Weighted average grant-date fair value (CDN$/ unit) | $ / shares $ 5.39 $ 4.39
Number of share units outstanding 1,645,972  
Recognized liability | $ $ 7.8 $ 5.5