Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments (Details Textual)

v3.19.3
Equity Method Investments (Details Textual)
$ / shares in Units, $ in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2019
USD ($)
Jun. 27, 2019
USD ($)
shares
Jun. 27, 2019
CAD ($)
$ / shares
shares
Nov. 01, 2018
USD ($)
Nov. 01, 2018
CAD ($)
$ / shares
shares
Nov. 30, 2017
USD ($)
Nov. 30, 2017
CAD ($)
$ / shares
shares
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Feb. 28, 2019
Schedule of Equity Method Investments [Line Items]                        
Payments to acquire investments                   $ 33.0 $ 152.1  
Equity in earnings (losses) of equity method investees               $ (485.6) $ (2.1) (588.6) 2.6  
Common shares to be repurchased for cancellation under share repurchase credit feature | shares   27,378,866 27,378,866                  
Unrealized net gain (loss) on securities measured at fair value               $ (839.1) 692.1 $ (1,666.6) 950.4  
Canopy Equity Method Investment [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership percentage 35.60%       36.60%     35.60%   35.60%   36.00%
Equity in earnings (losses) of equity method investees               $ (484.4)   $ (590.4)    
Fair value of equity method investment $ 2,916.0             2,916.0   2,916.0    
New November 2018 Canopy Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Equity in earnings (losses) of equity method investees   $ (409.0)                    
New Tranche B Warrants and New Tranche C Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Warrant reduction due to open market or private agreement purchases | shares   20,000,000 20,000,000                  
New Tranche B Warrants and New Tranche C Warrants [Member] | Maximum [Member]                        
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 [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Cost method investment, ownership percentage             9.90%          
Equity securities [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Payments to acquire investments       $ 3,869.9 $ 5,078.7 $ 191.3 $ 245.0          
Equity securities [Member] | November 2017 Canopy Investment [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Unrealized net gain (loss) on securities measured at fair value               0.0 328.1 0.0 461.0  
Common Stock [Member] | November 2018 Canopy Investment [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares acquired | shares         104,500,000              
Common Stock [Member] | November 2017 Canopy Investment [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares acquired | shares             18,900,000          
Warrant [Member] | Canopy Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Payments to acquire investments $ 6,100.0                      
Warrant [Member] | November 2017 Canopy Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares             18,900,000          
Exercise price of warrants, C$ per share | $ / shares             $ 12.98          
Unrealized net gain (loss) on securities measured at fair value               (316.7) 310.5 (450.8) 435.9  
Warrant [Member] | November 2018 Canopy Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares         139,700,000              
Unrealized net gain (loss) on securities measured at fair value                 $ 0.0   $ 0.0  
Warrant [Member] | Tranche A Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares         88,500,000              
Exercise price of warrants, C$ per share | $ / shares         $ 50.40              
Warrant [Member] | Tranche B Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares         51,200,000              
Warrant [Member] | New November 2018 Canopy Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares     139,700,000                  
Unrealized net gain (loss) on securities measured at fair value   $ 1,176.0           $ (473.6)   $ (1,134.4)    
Warrant [Member] | New Tranche A Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares     88,500,000                  
Exercise price of warrants, C$ per share | $ / shares     $ 50.40                  
Unrealized net gain (loss) on securities measured at fair value   322.5                    
Warrant [Member] | New Tranche B Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares     38,400,000                  
Exercise price of warrants, C$ per share | $ / shares     $ 76.68                  
Unrealized net gain (loss) on securities measured at fair value   $ 853.5                    
Warrant [Member] | New Tranche C Warrants [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Number of common shares to be acquired upon exercise of warrants | shares     12,800,000