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GOODWILL AND INTANGIBLE ASSETS, NET - Carrying Values (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
GOODWILL AND INTANGIBLE ASSETS, NET    
Indefinite life $ 641.4 $ 612.1
Definite life 2,452.0 2,235.9
Carrying amounts $ 3,093.4 $ 2,848.0