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Investments Transactions with MillerCoors (Details) (MillerCoors, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
MillerCoors
    
Schedule of Equity Method Investments [Line Items]    
Sales of beer to MillerCoors $ 2.8tap_EquityMethodInvestmentsIntercompanyTransactionsSalesRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember		 $ 2.6tap_EquityMethodInvestmentsIntercompanyTransactionsSalesRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember
Purchases of beer from MillerCoors 9.1tap_EquityMethodInvestmentsIntercompanyTransactionsPurchases
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember		 7.1tap_EquityMethodInvestmentsIntercompanyTransactionsPurchases
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember
Service agreement and other charges to MillerCoors 0.6tap_EquityMethodInvestmentsIntercompanyTransactionsServiceAgreementAndOtherChargesToInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember		 0.4tap_EquityMethodInvestmentsIntercompanyTransactionsServiceAgreementAndOtherChargesToInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember
Service agreement costs from MillerCoors $ 0.4tap_EquityMethodInvestmentsIntercompanyTransactionsServiceAgreementCosts
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember		 $ 0.2tap_EquityMethodInvestmentsIntercompanyTransactionsServiceAgreementCosts
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tap_MillercoorsMember