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Investments Consolidated Variable Interest Entity and Other (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity    
Total assets $ 13,996.3us-gaap_Assets $ 15,580.1us-gaap_Assets
Liabilities 6,110.2us-gaap_Liabilities 6,950.0us-gaap_Liabilities
Grolsch    
Variable Interest Entity    
Total assets 6.8us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_GrolschMember		 5.6us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_GrolschMember
Liabilities 2.9us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_GrolschMember		 1.7us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_GrolschMember
Cobra    
Variable Interest Entity    
Interest Purchased (as a percent) 50.10%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_CobraMember		  
Total assets 31.0us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_CobraMember		 36.5us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_CobraMember
Liabilities $ 0.8us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_CobraMember		 $ 1.9us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= tap_CobraMember