Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments - Narrative (Details)

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Equity Method Investments - Narrative (Details)
$ / shares in Units, $ in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Aug. 31, 2020
USD ($)
May 01, 2020
USD ($)
May 01, 2020
CAD ($)
$ / shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2019
CAD ($)
shares
Nov. 01, 2018
USD ($)
shares
Nov. 01, 2018
CAD ($)
shares
Aug. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Sep. 30, 2020
Feb. 29, 2020
Nov. 30, 2017
shares
Schedule of Equity Method Investments [Line Items]                            
Payments to acquire investments | $                   $ 217.4 $ 33.0      
Net gain (loss) recognized in income (loss) | $               $ 23.3 $ (16.0) $ (29.4) (35.7)      
Common shares to be repurchased for cancellation under share repurchase credit feature (in shares) | shares       27,378,866 27,378,866                  
Canopy Equity Method Investment                            
Schedule of Equity Method Investments [Line Items]                            
Equity method investment, ownership percentage 37.30%   38.60%     36.60% 36.60% 37.30%   37.30%     35.30%  
Equity in earnings (losses) from Canopy and related activities | $               $ (31.0) $ (484.4) $ (408.6) $ (590.4)      
Fair value of equity method investment | $ $ 2,345.3             2,345.3   2,345.3        
Equity method investment, difference between carrying amount and underlying equity | $ $ 367.9             $ 367.9   367.9        
May 2020 Canopy Investment | Foreign currency contracts                            
Schedule of Equity Method Investments [Line Items]                            
Net gain (loss) recognized in income (loss) | $                   $ (7.5)        
Acreage                            
Schedule of Equity Method Investments [Line Items]                            
Ownership percentage subject to fixed exchange ratio 100.00%             100.00%   100.00%        
Acreage | Subsequent Event                            
Schedule of Equity Method Investments [Line Items]                            
Ownership percentage subject to fixed exchange ratio                       70.00%    
Ownership percentage subject to floating exchange ratio                       30.00%    
New November 2018 Canopy Warrants                            
Schedule of Equity Method Investments [Line Items]                            
Equity in earnings (losses) from Canopy and related activities | $       $ (409.0)                    
Tranche B Warrants and Tranche C Warrants                            
Schedule of Equity Method Investments [Line Items]                            
Warrant reduction due to open market or private agreement purchases (in shares) | shares       20,000,000 20,000,000                  
Tranche B Warrants and Tranche C Warrants | Maximum                            
Schedule of Equity Method Investments [Line Items]                            
Dollar value of common shares to be repurchased for cancellation under share repurchase credit feature | $         $ 1,583.0                  
November 2017 Canopy Investment                            
Schedule of Equity Method Investments [Line Items]                            
Cost method investment, ownership percentage                           9.90%
Equity securities                            
Schedule of Equity Method Investments [Line Items]                            
Payments to acquire investments   $ 173.9 $ 245.0     $ 3,869.9 $ 5,078.7              
Common Stock | November 2018 Canopy Investment                            
Schedule of Equity Method Investments [Line Items]                            
Number of common shares acquired (in shares) | shares           104,500,000 104,500,000              
Common Stock | November 2017 Canopy Investment                            
Schedule of Equity Method Investments [Line Items]                            
Number of common shares acquired (in shares) | shares                           18,900,000
Warrant | Canopy Warrants [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Payments to acquire investments | $ $ 5,900.0                          
Warrant | November 2017 Canopy Warrants                            
Schedule of Equity Method Investments [Line Items]                            
Number of common shares to be acquired upon exercise of warrants (in shares) | shares                           18,900,000
Exercise price of warrants (in C$ per share) | $ / shares     $ 12.98                      
Warrant | November 2018 Canopy Warrants                            
Schedule of Equity Method Investments [Line Items]                            
Number of common shares to be acquired upon exercise of warrants (in shares) | shares           139,700,000 139,700,000              
Warrant | Tranche A Warrants                            
Schedule of Equity Method Investments [Line Items]                            
Number of common shares to be acquired upon exercise of warrants (in shares) | shares       88,500,000 88,500,000                  
Warrant | Tranche B Warrants                            
Schedule of Equity Method Investments [Line Items]                            
Number of common shares to be acquired upon exercise of warrants (in shares) | shares       38,400,000 38,400,000                  
Warrant | Tranche C Warrants                            
Schedule of Equity Method Investments [Line Items]                            
Number of common shares to be acquired upon exercise of warrants (in shares) | shares       12,800,000 12,800,000