Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Recurring Basis Measurements (Details)

v3.21.4
Fair Value of Financial Instruments - Recurring Basis Measurements (Details)
$ / shares in Units, shares in Millions, $ in Millions, $ in Millions
 3 Months Ended 9 Months Ended
May 01, 2020
USD ($)
May 01, 2020
CAD ($)
$ / shares
shares
Nov. 30, 2021
USD ($)
shares
Nov. 30, 2020
USD ($)
Nov. 30, 2021
USD ($)
shares
Nov. 30, 2020
USD ($)
Feb. 28, 2021
USD ($)
Fair Value, Net Asset (Liability) [Abstract]              
Debt securities     $ 292.9   $ 292.9   $ 1,818.1
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Unrealized net gain (loss) on securities measured at fair value     $ (199.7) $ 769.6 $ (1,534.8) $ 524.7  
Equity method investment, number of common shares acquired (in shares) | shares     142.3   142.3    
May 2020 Canopy Investment              
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Equity method investment, number of common shares acquired (in shares) | shares     18.9   18.9    
Equity securities | May 2020 Canopy Investment              
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Payments to acquire investments $ 173.9 $ 245.0          
Convertible debt securities              
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Unrealized net gain (loss) on securities measured at fair value     $ (10.3) 27.7 $ (38.4) 25.2  
Warrants | November 2017 Canopy Warrants              
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Unrealized net gain (loss) on securities measured at fair value     0.0 0.0 0.0 (61.8)  
Warrants | New November 2018 Canopy Warrants              
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Unrealized net gain (loss) on securities measured at fair value     (189.4) $ 741.9 (1,496.4) $ 561.3  
Warrants | May 2020 Canopy Investment              
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Exercise price of warrants, C$ per share | $ / shares   $ 12.98          
Common Stock | May 2020 Canopy Investment              
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]              
Equity method investment, number of common shares acquired (in shares) | shares   18.9          
Recurring | Foreign currency contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     21.0   21.0   76.6
Derivative liability     71.8   71.8   9.7
Recurring | Commodity derivative contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     45.8   45.8   21.2
Derivative liability     4.1   4.1   5.3
Recurring | Equity securities              
Fair Value, Net Asset (Liability) [Abstract]              
Equity securities     143.3   143.3   1,639.7
Recurring | Convertible debt securities              
Fair Value, Net Asset (Liability) [Abstract]              
Debt securities     146.5   146.5   176.3
Recurring | Quoted Prices in Active Markets (Level 1) | Foreign currency contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     0.0   0.0   0.0
Derivative liability     0.0   0.0   0.0
Recurring | Quoted Prices in Active Markets (Level 1) | Commodity derivative contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     0.0   0.0   0.0
Derivative liability     0.0   0.0   0.0
Recurring | Quoted Prices in Active Markets (Level 1) | Equity securities              
Fair Value, Net Asset (Liability) [Abstract]              
Equity securities     0.0   0.0   0.0
Recurring | Quoted Prices in Active Markets (Level 1) | Convertible debt securities              
Fair Value, Net Asset (Liability) [Abstract]              
Debt securities     0.0   0.0   0.0
Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     21.0   21.0   76.6
Derivative liability     71.8   71.8   9.7
Recurring | Significant Other Observable Inputs (Level 2) | Commodity derivative contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     45.8   45.8   21.2
Derivative liability     4.1   4.1   5.3
Recurring | Significant Other Observable Inputs (Level 2) | Equity securities              
Fair Value, Net Asset (Liability) [Abstract]              
Equity securities     143.3   143.3   1,639.7
Recurring | Significant Other Observable Inputs (Level 2) | Convertible debt securities              
Fair Value, Net Asset (Liability) [Abstract]              
Debt securities     146.5   146.5   176.3
Recurring | Significant Unobservable Inputs (Level 3) | Foreign currency contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     0.0   0.0   0.0
Derivative liability     0.0   0.0   0.0
Recurring | Significant Unobservable Inputs (Level 3) | Commodity derivative contracts              
Fair Value, Net Asset (Liability) [Abstract]              
Derivative asset     0.0   0.0   0.0
Derivative liability     0.0   0.0   0.0
Recurring | Significant Unobservable Inputs (Level 3) | Equity securities              
Fair Value, Net Asset (Liability) [Abstract]              
Equity securities     0.0   0.0   0.0
Recurring | Significant Unobservable Inputs (Level 3) | Convertible debt securities              
Fair Value, Net Asset (Liability) [Abstract]              
Debt securities     $ 0.0   $ 0.0   $ 0.0