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, 2018
USD ($)
Nov. 01, 2018
CAD ($)
$ / shares
shares
Nov. 01, 2018
USD ($)
Nov. 30, 2018
USD ($)
Nov. 30, 2017
CAD ($)
$ / shares
Nov. 30, 2017
USD ($)
Nov. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Nov. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Nov. 01, 2018
USD ($)
shares
Feb. 28, 2018
USD ($)
Nov. 30, 2017
USD ($)
shares
Schedule of Equity Method Investments [Line Items]                          
Payments to acquire investments                 $ 4,077.3 $ 191.3      
Equity method investments $ 3,583.0     $ 3,583.0     $ 3,583.0   3,583.0     $ 121.5 $ 118.9
Unrealized net gain (loss) on securities measured at fair value             (163.9) $ 216.8 786.5 216.8      
Net Gain (Loss) Recognized in Income             (12.8) 1.5 (28.6) 8.7      
November 2018 Canopy Investment [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Equity method investments                     $ 2,740.3    
Direct acquisition costs       17.2                  
November 2017 Canopy Investment [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Equity method investments                     $ 694.9    
Canopy Equity Method Investment [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Fair value of equity method investment 4,190.8     4,190.8     4,190.8   4,190.8        
Equity method investments $ 3,435.2     $ 3,435.2     $ 3,435.2   $ 3,435.2     $ 0.0  
Equity method investment, ownership percentage 36.00% 36.60%   36.00%     36.00%   36.00%   36.60% 0.00%  
Carrying amount of investment greater than equity in underlying assets $ 2,500.0     $ 2,500.0     $ 2,500.0   $ 2,500.0        
November 2018 Canopy Warrants [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Direct acquisition costs       7.3                  
November 2017 Canopy Investment [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Cost method investment, ownership percentage                         9.90%
November 2018 Canopy Transaction [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Direct acquisition costs       24.5                  
November 2018 Canopy Transaction [Member] | Foreign currency contracts [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Net Gain (Loss) Recognized in Income             (25.5)   (30.2)        
Equity securities [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Payments to acquire investments   $ 5,078.7 $ 3,869.9   $ 245.0 $ 191.3              
Equity securities at fair value 1,881.2     1,881.2     1,881.2   1,881.2     $ 655.6  
Equity securities [Member] | November 2017 Canopy Investment [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Equity securities at fair value 0.0     0.0     0.0   0.0     402.4  
Unrealized net gain (loss) on securities measured at fair value             (168.5) 139.7 292.5 139.7      
Common Stock [Member] | November 2018 Canopy Investment [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of common shares acquired | shares   104,500,000                 104,500,000    
Fair value of equity method investment   $ 5,060.9                      
Equity method investments   3,573.7                 $ 2,723.1    
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] | November 2018 Canopy Warrants [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Equity securities at fair value   $ 1,505.0                 $ 1,146.8    
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 | $ / shares         $ 12.98                
Equity securities at fair value 476.8     476.8     476.8   476.8     253.2  
Unrealized net gain (loss) on securities measured at fair value             (212.4) 77.1 223.5 77.1      
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                 139,700,000    
Equity securities at fair value 1,404.4 $ 2,131.3   $ 1,404.4     1,404.4   1,404.4     $ 0.0  
Unrealized net gain (loss) on securities measured at fair value             $ 257.6 $ 0.0 $ 257.6 $ 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                 88,500,000    
Exercise price of warrants | $ / 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                 51,200,000    
Warrant [Member] | Canopy Warrants [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Payments to acquire investments $ 5,300.0