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Earnings Per Share Antidilutive (Details)
Share data in Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Convertible Senior Notes Due 2013 $575 Million 2.5% [Member]
Jul. 31, 2013
Convertible Senior Notes Due 2013 $575 Million 2.5% [Member]
USD ($)
Jun. 30, 2012
Convertible Senior Unsecured Note Due 2013 €500 Million 0.0% [Member]
EUR (€)
Dec. 31, 2014
Stock options, SOSARs and RSUs
Dec. 31, 2013
Stock options, SOSARs and RSUs
Dec. 29, 2012
Stock options, SOSARs and RSUs
Anti-dilutive securities:            
Anti-dilutive security (in shares)       0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
0.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
1.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
Debt instrument, interest rate percentage 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= tap_ConvertibleSeniorNotesDue2013575Million25Member
         
Face amount of senior convertible notes   $ 575,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= tap_ConvertibleSeniorNotesDue2013575Million25Member
€ 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= tap_ConvertibleSeniorUnsecuredNoteDue2013500Million00Member