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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of operating segments [line items]    
Revenue $ 2,830.0 $ 2,704.5
Non-current assets other than financial instruments and deferred tax assets 3,390.0 3,181.3
CANADA    
Disclosure of operating segments [line items]    
Revenue 253.6 269.9
Non-current assets other than financial instruments and deferred tax assets 904.6 1,051.1
UNITED STATES    
Disclosure of operating segments [line items]    
Revenue 1,049.7 981.3
Non-current assets other than financial instruments and deferred tax assets 946.1 988.1
BRAZIL    
Disclosure of operating segments [line items]    
Non-current assets other than financial instruments and deferred tax assets 118.1 124.9
UNITED KINGDOM    
Disclosure of operating segments [line items]    
Revenue 232.8 270.2
Non-current assets other than financial instruments and deferred tax assets 250.3 218.0
GERMANY    
Disclosure of operating segments [line items]    
Revenue 95.6 83.8
LUXEMBOURG    
Disclosure of operating segments [line items]    
Non-current assets other than financial instruments and deferred tax assets 194.1 182.9
NETHERLANDS    
Disclosure of operating segments [line items]    
Revenue 95.8 88.7
Non-current assets other than financial instruments and deferred tax assets 223.6 159.0
Other European Countries    
Disclosure of operating segments [line items]    
Revenue 337.6 320.4
Non-current assets other than financial instruments and deferred tax assets 324.8 274.0
MALAYSIA    
Disclosure of operating segments [line items]    
Non-current assets other than financial instruments and deferred tax assets 197.1 0.1
UNITED ARAB EMIRATES    
Disclosure of operating segments [line items]    
Revenue 102.8 70.5
CHINA    
Disclosure of operating segments [line items]    
Revenue 220.0 158.5
Other Asian Countries    
Disclosure of operating segments [line items]    
Revenue 289.5 321.2
Non-current assets other than financial instruments and deferred tax assets 149.2 109.0
AUSTRALIA    
Disclosure of operating segments [line items]    
Revenue 52.7 65.0
Other Countries    
Disclosure of operating segments [line items]    
Revenue 99.9 75.0
Non-current assets other than financial instruments and deferred tax assets $ 82.1 $ 74.2