Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Instruments - Narrative (Details)

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Fair Value of Financial Instruments - Narrative (Details)
$ in Millions, $ in Millions
12 Months Ended
Feb. 29, 2024
USD ($)
Feb. 28, 2023
USD ($)
Feb. 28, 2022
USD ($)
Aug. 31, 2023
USD ($)
May 31, 2023
USD ($)
Apr. 30, 2023
CAD ($)
Aug. 31, 2022
USD ($)
May 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-term debt, including current portion $ 11,637.9 $ 11,296.0            
Impairment of equity method investments 136.1 1,060.3 $ 0.0          
Impairment of long-lived assets 0.0 0.0 665.9          
2023 Canopy Promissory Note | Unsecured debt                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Debt instrument, face amount           $ 100.0    
Coupon rate of notes           4.25%    
Carrying amount                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-term debt, including current portion 11,637.9 11,296.0            
Fair value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-term debt, including current portion 10,775.8 10,236.0            
Convertible debt securities [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Canopy debt securities           $ 100.0    
Corporate Venture Capital, Equity Method Investments                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Carrying value of equity method investments       $ 14.9        
Equity method investments, fair value       $ 2.6        
Impairment of equity method investments 12.3              
Canopy equity method investment                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Carrying value of equity method investments         $ 266.2   $ 1,695.1  
Equity method investments, fair value         $ 142.7   $ 634.8  
Impairment of equity method investments 123.5 1,060.3            
Construction in progress                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Impairment of long-lived assets     665.9          
Trademarks                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Net Carrying Amount 2,715.2 2,710.4            
Operating Segments | Beer | Trademarks                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Net Carrying Amount   13.0            
Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Impairment of equity method investments $ 136.1 1,060.3            
Impairment of long-lived assets   53.5 $ 665.9          
Nonrecurring | Trademarks                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Impairment of trademarks   13.0            
Nonrecurring | Operating Segments | Craft Beer Business                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-lived assets, carrying value   59.8            
Long-lived assets, estimated fair value   6.3            
Long-lived asset impairment   53.5            
Nonrecurring | Operating Segments | Beer | Mexicali Brewery | Construction in progress                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Long-lived assets, carrying value               $ 685.9
Long-lived assets, estimated fair value               $ 20.0
Nonrecurring | Operating Segments | Beer | Trademarks                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Impairment of trademarks   $ 13.0