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Commitments and Contingencies (Details) (USD $)
 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
sqft
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2013
Dec. 31, 2013
May 01, 2014
Feb. 28, 2015
Feb. 02, 2015
Jun. 30, 2012
Jun. 29, 2012
Jan. 13, 2015
Oct. 01, 2014
sqft
Future Estimated Contract Obligations                        
2015 $ 139,382,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear [1],[2]                      
2016 15,239,000us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear [1],[2]                      
2017 288,225,000us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear [1],[2]                      
2018 7,404,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear [1],[2]                      
2019 7,417,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear [1],[2]                      
Later Years 48,540,000us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear [1],[2]                      
Total 506,207,000us-gaap_RecordedUnconditionalPurchaseObligation [1],[2]                      
Principal 275,000,000us-gaap_DebtInstrumentFaceAmount 275,000,000us-gaap_DebtInstrumentFaceAmount     275,000,000us-gaap_DebtInstrumentFaceAmount              
Convertible senior notes (due 2017) 246,676,000us-gaap_SeniorNotes 236,088,000us-gaap_SeniorNotes     236,088,000us-gaap_SeniorNotes              
Square footage of real estate property 173,146us-gaap_AreaOfRealEstateProperty                      
Operating leases, percent 88.80%mdco_OperatingLeasesPercent                      
Aggregate rent expense under property leases 8,500,000us-gaap_LeaseAndRentalExpense 7,300,000us-gaap_LeaseAndRentalExpense 5,800,000us-gaap_LeaseAndRentalExpense                  
Inventories [Member]                        
Future Estimated Contract Obligations                        
2015 52,174,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		 [1],[2]                      
2016 783,000us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		 [1],[2]                      
2017 130,000us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		 [1],[2]                      
2018 130,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		 [1],[2]                      
2019 130,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		 [1],[2]                      
Later Years 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		 [1],[2]                      
Total 53,347,000us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		 [1],[2]                      
Long-term Debt [Member]                        
Future Estimated Contract Obligations                        
2015 3,781,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [1],[2]                      
2016 3,781,000us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [1],[2]                      
2017 276,576,000us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [1],[2]                      
2018 0us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [1],[2]                      
2019 0us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [1],[2]                      
Later Years 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [1],[2]                      
Total 284,138,000us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_LongTermDebtMember		 [1],[2]                      
Research and Development Arrangement [Member]                        
Future Estimated Contract Obligations                        
2015 72,617,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResearchAndDevelopmentArrangementMember		 [1],[2]                      
2016 1,952,000us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResearchAndDevelopmentArrangementMember		 [1],[2]                      
2017 3,210,000us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResearchAndDevelopmentArrangementMember		 [1],[2]                      
2018 44,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResearchAndDevelopmentArrangementMember		 [1],[2]                      
2019 10,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResearchAndDevelopmentArrangementMember		 [1],[2]                      
Later Years 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResearchAndDevelopmentArrangementMember		 [1],[2]                      
Total 77,833,000us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResearchAndDevelopmentArrangementMember		 [1],[2]                      
Operating Leases [Member]                        
Future Estimated Contract Obligations                        
2015 8,221,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_OperatingLeasesMember		 [1],[2]                      
2016 7,556,000us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_OperatingLeasesMember		 [1],[2]                      
2017 8,235,000us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_OperatingLeasesMember		 [1],[2]                      
2018 7,230,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_OperatingLeasesMember		 [1],[2]                      
2019 7,277,000us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_OperatingLeasesMember		 [1],[2]                      
Later Years 48,540,000us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_OperatingLeasesMember		 [1],[2]                      
Total 87,059,000us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_OperatingLeasesMember		 [1],[2]                      
Selling, General and Administrative [Member]                        
Future Estimated Contract Obligations                        
2015 2,589,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_SellingGeneralAndAdministrativeMember		 [1],[2]                      
2016 1,167,000us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_SellingGeneralAndAdministrativeMember		 [1],[2]                      
2017 74,000us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_SellingGeneralAndAdministrativeMember		 [1],[2]                      
2018 0us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_SellingGeneralAndAdministrativeMember		 [1],[2]                      
2019 0us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_SellingGeneralAndAdministrativeMember		 [1],[2]                      
Later Years 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_SellingGeneralAndAdministrativeMember		 [1],[2]                      
Total 3,830,000us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_SellingGeneralAndAdministrativeMember		 [1],[2]                      
Research and Development and Selling, General Administrative [Member]                        
Future Estimated Contract Obligations                        
Total 9,600,000us-gaap_RecordedUnconditionalPurchaseObligation
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= mdco_ResearchAndDevelopmentAndSellingGeneralAdministrativeMember		                      
Biogen Idec and HRI [Member]                        
Future Estimated Contract Obligations                        
Royalties 131,300,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_BiogenIdecAndHriMember		 140,700,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_BiogenIdecAndHriMember		 122,200,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_BiogenIdecAndHriMember		                  
Cleviprex [Member]                        
Future Estimated Contract Obligations                        
Royalties 800,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_CleviprexMember		 1,000,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_CleviprexMember		 1,000,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_CleviprexMember		                  
Recothrom [Member]                        
Future Estimated Contract Obligations                        
Royalties 7,500,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_RecothromMember		 7,400,000us-gaap_RoyaltyExpense
/ mdco_LicenseAgreementsAxis
= mdco_RecothromMember		                    
Lonza Braine [Member] | Inventories [Member]                        
Future Estimated Contract Obligations                        
2015 20,100,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ mdco_PurchaseCommitmentBySupplierAxis
= mdco_LonzaBraineMember
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		                      
Targanta [Member]                        
Future Estimated Contract Obligations                        
Payment for milestone met 49,400,000mdco_CollaborativeArrangementPaymentforMilestoneMet1
/ us-gaap_TypeOfArrangementAxis
= mdco_TargantaMember		                      
Additional payments 25,000,000mdco_CollaborativeArrangementAdditionalPayments
/ us-gaap_TypeOfArrangementAxis
= mdco_TargantaMember		                      
Incline Therapeutics, Inc. [Member]                        
Future Estimated Contract Obligations                        
Payment for milestone met 189,300,000mdco_CollaborativeArrangementPaymentforMilestoneMet1
/ us-gaap_TypeOfArrangementAxis
= mdco_InclineTherapeuticsIncMember		                      
Additional payments 113,000,000mdco_CollaborativeArrangementAdditionalPayments
/ us-gaap_TypeOfArrangementAxis
= mdco_InclineTherapeuticsIncMember		                      
ProFibrix [Member]                        
Future Estimated Contract Obligations                        
Payment for milestone met 140,000,000mdco_CollaborativeArrangementPaymentforMilestoneMet1
/ us-gaap_TypeOfArrangementAxis
= mdco_ProFibrixMember		                      
Alnylam Pharmaceuticals, Inc. [Member]                        
Future Estimated Contract Obligations                        
Payment for milestone met 170,000,000mdco_CollaborativeArrangementPaymentforMilestoneMet1
/ us-gaap_TypeOfArrangementAxis
= mdco_AlnylamPharmaceuticalsInc.Member		     180,000,000mdco_CollaborativeArrangementPaymentforMilestoneMet1
/ us-gaap_TypeOfArrangementAxis
= mdco_AlnylamPharmaceuticalsInc.Member		                
Pfizer [Member]                        
Future Estimated Contract Obligations                        
Payment for milestone met 422,000,000mdco_CollaborativeArrangementPaymentforMilestoneMet1
/ us-gaap_TypeOfArrangementAxis
= mdco_PfizerMember		                      
AstraZeneca [Member]                        
Future Estimated Contract Obligations                        
Payment for milestone met 54,500,000.0mdco_CollaborativeArrangementPaymentforMilestoneMet1
/ us-gaap_TypeOfArrangementAxis
= mdco_AstraZenecaMember		                      
Convertible Debt [Member]                        
Future Estimated Contract Obligations                        
Convertible senior notes (due 2017)                 275,000,000us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 275,000,000us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Rempex [Member]                        
Future Estimated Contract Obligations                        
Upfront cash consideration         140,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mdco_RempexPharmaceuticalsIncMember		              
Contingent consideration 315,700,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= mdco_RempexPharmaceuticalsIncMember		                      
Tenaxis Medical [Member]                        
Future Estimated Contract Obligations                        
Upfront cash consideration           58,871,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mdco_TenaxisMedicalMember		            
Contingent consideration 112,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= mdco_TenaxisMedicalMember		                      
Subsequent Event [Member]                        
Future Estimated Contract Obligations                        
Payment to acquire business             6,500,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		          
Subsequent Event [Member] | Annovation [Member]                        
Future Estimated Contract Obligations                        
Upfront cash consideration             28,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mdco_AnnovationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 28,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mdco_AnnovationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		        
Contingent consideration               26,300,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= mdco_AnnovationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		        
Payment to acquire business             26,300,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mdco_AnnovationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		          
Subsequent Event [Member] | BMS [Member]                        
Future Estimated Contract Obligations                        
Payment to acquire business             127,700,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mdco_BristolMyersSquibbMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		          
Convertible Senior Notes Due 2022 [Member] | Subsequent Event [Member] | Senior Notes [Member]                        
Future Estimated Contract Obligations                        
Principal                     400,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Orbactiv [Member] | Inventories [Member]                        
Future Estimated Contract Obligations                        
2015 23,800,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_ProductOrServiceAxis
= mdco_OrbactivMember
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		                      
Recothrom [Member] | Inventories [Member]                        
Future Estimated Contract Obligations                        
2015 4,500,000us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
/ us-gaap_ProductOrServiceAxis
= mdco_RecothromMember
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember		                      
Building [Member]                        
Future Estimated Contract Obligations                        
Square footage of real estate property                       63,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Lease term 144 months                      
Annual rent expense 2,900,000mdco_LesseeLeasingArrangementsOperatingLeasesTermofContractAnnualRentExpense
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		                      
Expected total obligation for lease $ 35,300,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		                      
[1] This table does not include $400.0 million aggregate principal amount of the convertible senior notes due 2022 issued by us in January 2015 (see Footnote No. 22).
[2] This table does not include any milestone and royalty payments which may become payable to third parties for which the timing and likelihood of such payments are not known, as discussed below.