Quarterly report pursuant to Section 13 or 15(d)

Goodwill (Details)

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Goodwill (Details)
CAD in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Nov. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Dec. 16, 2016
CAD
Dec. 16, 2016
USD ($)
Changes in the carrying amount of goodwill [Roll Forward]        
Goodwill, beginning of period $ 7,920.5 $ 7,138.6    
Purchase accounting allocations 119.9 884.5    
Canadian Divestiture   (126.1)    
Foreign currency translation adjustments 45.3 23.5    
Goodwill, end of period 8,085.7 7,920.5    
Operating Segments [Member] | Beer [Member]        
Changes in the carrying amount of goodwill [Roll Forward]        
Goodwill, beginning of period 5,053.0 4,530.1    
Purchase accounting allocations 63.7 510.8    
Canadian Divestiture   0.0    
Foreign currency translation adjustments 49.7 12.1    
Goodwill, end of period 5,166.4 5,053.0    
Operating Segments [Member] | Beer [Member] | Obregon Brewery [Member]        
Changes in the carrying amount of goodwill [Roll Forward]        
Purchase accounting allocations 13.8      
Operating Segments [Member] | Wine and Spirits [Member]        
Changes in the carrying amount of goodwill [Roll Forward]        
Goodwill, beginning of period 2,867.5 2,608.5    
Purchase accounting allocations 56.2 373.7    
Canadian Divestiture   (126.1)    
Foreign currency translation adjustments (4.4) 11.4    
Goodwill, end of period $ 2,919.3 $ 2,867.5    
Accumulated impairment losses     CAD 289.1 $ 216.8