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Goodwill and Intangible Assets Amortization Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Estimated amortization expense of finite-lived intangible assets          
2016 - remaining $ 20.0   $ 20.0    
2017 29.4   29.4    
2018 27.9   27.9    
2019 27.9   27.9    
2020 27.7   27.7    
Amortization expense of intangible assets 10.1 $ 5.9 19.7 $ 13.7  
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 $ 2,349.0   $ 2,349.0