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Non Marketable Investments Non Marketable Investments (Details) (USD $)
3 Months Ended
Sep. 30, 2014
Dec. 31, 2014
GeNO, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Cost method investment ownership percentage (less than)   10.00%mdco_CostMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mdco_GenoLlcMember
Non-controlling equity investment $ 0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mdco_GenoLlcMember
 
Investment impairment charge $ 7,500,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mdco_GenoLlcMember
 
Annovation [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity ownership percentage 36.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mdco_AnnovationMember