Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments (Details Textual)

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Equity Method Investments (Details Textual)
$ / shares in Units, $ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 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
Nov. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
Nov. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
Feb. 28, 2019
Schedule of Equity Method Investments [Line Items]                        
Payments to acquire investments                   $ 33.7 $ 4,077.3  
Equity in earnings (losses) of equity method investees               $ 77.3 $ 29.3 (511.3) 31.9  
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               $ (534.3) (163.9) $ (2,200.9) 786.5  
Canopy Equity Method Investment [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership percentage 35.40%       36.60%     35.40%   35.40%   36.00%
Equity in earnings (losses) of equity method investees               $ 46.2   $ (544.2)    
Fair value of equity method investment $ 2,276.7             2,276.7   2,276.7    
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 (168.5) 0.0 292.5  
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 $ 6,000.0                      
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               (91.9) (212.4) (542.7) 223.5  
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                 $ 257.6   $ 257.6  
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               $ (426.8)   (1,561.2)    
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                  
Warrant [Member] | New November 2018 Canopy Warrants Modification [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Unrealized net gain (loss) on securities measured at fair value   $ 1,176.0               $ 1,176.0