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Goodwill and Intangible Assets Amortization Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Estimated amortization expense of finite-lived intangible assets          
2016 - remaining $ 9.8   $ 9.8    
2017 28.5   28.5    
2018 27.1   27.1    
2019 27.1   27.1    
2020 26.9   26.9    
Amortization expense of intangible assets 9.8 $ 6.4 29.5 $ 20.1  
Canada [Member]          
Estimated amortization expense of finite-lived intangible assets          
Percentage Of Fair Value Exceeding Carrying Value         20.00%
Molson Core Brands [Member]          
Estimated amortization expense of finite-lived intangible assets          
Percentage Of Fair Value Exceeding Carrying Value         3.00%
Indefinite-lived intangible assets $ 2,300.0   $ 2,300.0