Annual report pursuant to Section 13 and 15(d)

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

v3.21.1
Fair Value of Financial Instruments - Recurring Basis Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Fair Value, Net Asset (Liability) [Abstract]        
Debt securities   $ 1,818.1 $ 1,117.1  
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]        
Unrealized net gain (loss) on securities measured at fair value   802.0 (2,126.4) $ 1,971.2
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 $ 1,176.0      
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   40.5 (94.6)  
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   (61.8) (543.7)  
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   823.3 (1,488.1)  
Recurring | Foreign currency contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative asset   76.6 96.3  
Derivative liability   9.7 34.4  
Recurring | Commodity derivative contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative asset   21.2 0.6  
Derivative liability   5.3 40.9  
Recurring | Equity securities        
Fair Value, Net Asset (Liability) [Abstract]        
Equity securities   1,639.7 991.5  
Recurring | Convertible debt securities        
Fair Value, Net Asset (Liability) [Abstract]        
Debt securities   176.3 125.6  
Recurring | Interest rate swap contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     0.8  
Recurring | Treasury lock contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     7.6  
Recurring | Quoted Prices in Active Markets (Level 1) | Foreign currency contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative asset   0.0 0.0  
Derivative liability   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  
Derivative liability   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  
Recurring | Quoted Prices in Active Markets (Level 1) | Convertible debt securities        
Fair Value, Net Asset (Liability) [Abstract]        
Debt securities   0.0 0.0  
Recurring | Quoted Prices in Active Markets (Level 1) | Interest rate swap contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     0.0  
Recurring | Quoted Prices in Active Markets (Level 1) | Treasury lock contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     0.0  
Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative asset   76.6 96.3  
Derivative liability   9.7 34.4  
Recurring | Significant Other Observable Inputs (Level 2) | Commodity derivative contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative asset   21.2 0.6  
Derivative liability   5.3 40.9  
Recurring | Significant Other Observable Inputs (Level 2) | Equity securities        
Fair Value, Net Asset (Liability) [Abstract]        
Equity securities   1,639.7 991.5  
Recurring | Significant Other Observable Inputs (Level 2) | Convertible debt securities        
Fair Value, Net Asset (Liability) [Abstract]        
Debt securities   176.3 125.6  
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     0.8  
Recurring | Significant Other Observable Inputs (Level 2) | Treasury lock contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     7.6  
Recurring | Significant Unobservable Inputs (Level 3) | Foreign currency contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative asset   0.0 0.0  
Derivative liability   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  
Derivative liability   0.0 0.0  
Recurring | Significant Unobservable Inputs (Level 3) | Equity securities        
Fair Value, Net Asset (Liability) [Abstract]        
Equity securities   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  
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     0.0  
Recurring | Significant Unobservable Inputs (Level 3) | Treasury lock contracts        
Fair Value, Net Asset (Liability) [Abstract]        
Derivative liability     $ 0.0