Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.4
Fair Value of Financial Instruments - Recurring Basis Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Feb. 29, 2020
Fair Value, Net Asset (Liability) [Abstract]            
Debt securities   $ 1,536.2   $ 1,536.2   $ 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   769.6 $ (534.3) 524.7 $ (2,200.9)  
Warrant | 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 (91.9) (61.8) (542.7)  
Warrant | 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 $ 1,176.0 741.9 (426.8) 561.3 (1,561.2)  
Canopy 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   27.7 $ (15.6) 25.2 $ (97.0)  
Recurring | Foreign currency contracts            
Fair Value, Net Asset (Liability) [Abstract]            
Derivative asset   94.2   94.2   96.3
Derivative liability   6.4   6.4   34.4
Recurring | Commodity derivative contracts            
Fair Value, Net Asset (Liability) [Abstract]            
Derivative asset   10.4   10.4   0.6
Derivative liability   20.3   20.3   40.9
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 | Equity securities            
Fair Value, Net Asset (Liability) [Abstract]            
Equity securities   1,377.7   1,377.7   991.5
Recurring | Canopy Debt Securities            
Fair Value, Net Asset (Liability) [Abstract]            
Debt securities   158.5   158.5   125.6
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) | 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 | 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) | Canopy 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   94.2   94.2   96.3
Derivative liability   6.4   6.4   34.4
Recurring | Significant Other Observable Inputs (Level 2) | Commodity derivative contracts            
Fair Value, Net Asset (Liability) [Abstract]            
Derivative asset   10.4   10.4   0.6
Derivative liability   20.3   20.3   40.9
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 Other Observable Inputs (Level 2) | Equity securities            
Fair Value, Net Asset (Liability) [Abstract]            
Equity securities   1,377.7   1,377.7   991.5
Recurring | Significant Other Observable Inputs (Level 2) | Canopy Debt Securities            
Fair Value, Net Asset (Liability) [Abstract]            
Debt securities   158.5   158.5   125.6
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) | 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
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) | Canopy Debt Securities            
Fair Value, Net Asset (Liability) [Abstract]            
Debt securities   $ 0.0   $ 0.0   $ 0.0