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Goodwill and Intangible Assets Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 29, 2012
Sep. 24, 2011
Dec. 31, 2011
Estimated amortization expense of finite-lived intangible assets          
2012 - remaining     $ 11.9    
2013     47.8    
2014     39.9    
2015     37.2    
2016     37.2    
Amortization expense of intangible assets 11.8 9.7 30.4 30.0  
Goodwill 2,415.6   2,415.6   1,453.3
U.K. [Member]
         
Estimated amortization expense of finite-lived intangible assets          
Percentage of fair value exceeding carrying value 7.00%   7.00%    
Goodwill 864.0   864.0   746.1
Canada [Member]
         
Estimated amortization expense of finite-lived intangible assets          
Percentage of fair value exceeding carrying value 15.00%   15.00%    
Goodwill 776.1   776.1   689.5
MC Si Hai [Member]
         
Estimated amortization expense of finite-lived intangible assets          
Percentage of fair value exceeding carrying value 4.00%   4.00%    
Goodwill 9.5   9.5    
Ownership percentage by noncontrolling owners 49.00%   49.00%    
Molson Core Brands [Member]
         
Estimated amortization expense of finite-lived intangible assets          
Percentage of fair value exceeding carrying value 14.00%   14.00%    
Indefinite-lived intangible assets 3,105.2   3,105.2    
Carling [Member] | U.K. [Member]
         
Estimated amortization expense of finite-lived intangible assets          
Indefinite-lived intangible assets 324.0   324.0    
Brand and Distribution Rights [Member]
         
Estimated amortization expense of finite-lived intangible assets          
Impairment charge on definite-lived intangible assets     0.9    
MC Si Hai [Member]
         
Estimated amortization expense of finite-lived intangible assets          
Asset impairment charges $ 27.6