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Share Capital - Narrative (Details)
$ / shares in Units, $ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
May 11, 2020
shares
Sep. 21, 2020
USD ($)
shares
Jun. 30, 2020
CAD ($)
acqusition
$ / shares
shares
Jun. 30, 2020
USD ($)
acqusition
$ / shares
Jun. 30, 2019
acqusition
shares
May 10, 2020
shares
Apr. 16, 2020
USD ($)
Apr. 15, 2020
USD ($)
Apr. 02, 2019
USD ($)
Disclosure of classes of share capital [line items]                  
Number of shares issued (in shares) 110,089,377 5,278,286 21,009,339     1,321,072,394      
Shelf prospectus, amount allowed | $             $ 100,000,000.0   $ 750,000,000.0
ATM supplement, amount allowed, common shares | $             650,000,000.0 $ 400,000,000.0 $ 400,000,000.0
ATM supplement, additional amount allowed, common shares | $             $ 250,000,000    
Number of shares outstanding (in shares) 110,089,377         1,321,072,394      
Stock split ratio 0.0833                
Number of shares issued and fully paid (in shares)     115,228,811   84,786,562        
ATM supplement, gross proceeds   $ 36,670,000 $ 585.1 $ 435,500,000          
Proceeds received per share (in CAD per share) | (per share)     $ 27.85 $ 20.73          
Brokerage fee expense     $ 11.7 $ 8,700,000          
ATM supplement, net proceeds     $ 573.4 $ 426,800,000          
Number of common shares per warrant (in shares)     1            
Class A Preference Shares                  
Disclosure of classes of share capital [line items]                  
Par value per share (in CAD per share) | $ / shares     $ 1.00            
Number of shares issued (in shares)     0            
Number of shares outstanding (in shares)     0            
Class B Preference Shares                  
Disclosure of classes of share capital [line items]                  
Par value per share (in CAD per share) | $ / shares     $ 5.00            
Number of shares issued (in shares)     0            
Number of shares outstanding (in shares)     0            
Compensation Options                  
Disclosure of classes of share capital [line items]                  
Number of common shares per option (in shares)     1            
Number of warrants per option (in shares)     0.5            
Compensation Warrants                  
Disclosure of classes of share capital [line items]                  
Number of common shares per warrant (in shares)     1            
Exercise period of options     2 years 2 years          
Milestone Payments Contingent Liabilities                  
Disclosure of classes of share capital [line items]                  
Number of shares issued (in shares)     614,513   20,311        
Number of acquisitions | acqusition     3 3 2