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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Liabilities Liabilities [Abstract] Proceeds from maturity of investments Proceeds from Sale, Maturity and Collection of Investments ImmunoGen, Inc. ImmunoGen, Inc. [Member] ImmunoGen, Inc. 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[Member] Nippon Shinyaku Co., Ltd. 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Arrangement by Share-based Payment Award, Award Requisite Service Period Accrued interest Interest Payable, Current Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Income tax examination, penalties and interest expense Income Tax Examination, Penalties and Interest Expense Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Loss recognized in foreign exchange loss Gain (Loss) on Fair Value Hedges Recognized in Earnings Lapse of the applicable statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Cash acquired Cash Asset Acquisition, Recognized Identifiable Assets Acquired And Liabilities Assumed, Cash And Equivalents Asset Acquisition, Recognized Identifiable Assets Acquired And Liabilities Assumed, Cash And Equivalents Net Unrealized Loss From Hedging Activities Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] November 2016 Share Repurchase Program November 2016 Share Repurchase Program [Member] November 2016 Share Repurchase Program [Member] Weighted-Average Ordinary Shares Excluded from Computation of Diluted Net Income (Loss) per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Five Other Current Assets Other Current Assets [Text Block] Recorded expense related to retainer fees earned and deferred Deferred Compensation Arrangement with Individual, Compensation Expense Auditor Firm ID Auditor Firm ID Stock repurchased, average cost per share (in dollars per share) Stock Repurchased During Period, Average Cost Per Share Stock Repurchased During Period, Average Cost Per Share Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other Deferred Other Tax Expense (Benefit) Weighted-average grant-date fair value, RSUs and PRSUs released (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Class of Stock [Domain] Class of Stock [Domain] Royalties and contract revenues Product And Services, Royalties And Contract Revenue [Member] Product And Services, Royalties And Contract Revenue [Member] Total cash consideration Payments to Acquire Businesses, Gross Cost Of Product Sales Adjustment Cost Of Product Sales Adjustment [Member] Cost Of Product Sales Adjustment Defined Contribution Plan [Table] Defined Contribution Plan [Table] 2007 Employee Stock Purchase Plan Two Thousand Seven Employee Stock Purchase Plan [Member] Two Thousand Seven Employee Stock Purchase Plan [Member] Operating cash outflows from finance leases Finance Lease, Interest Payment on Liability Line of credit, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Foreign exchange Goodwill, Foreign Currency Translation Gain (Loss) Ownership [Domain] Ownership [Domain] Jazz Securities Designated Activity Company Jazz Securities Designated Activity Company [Member] Jazz Securities Designated Activity Company McKesson McKesson Corporation [Member] McKesson Corporation [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Other current assets Total other current assets Other Assets, Current Advertising expenses Advertising Expense Other non-current assets Increase (Decrease) in Other Noncurrent Assets Operating lease liabilities, less current portion Increase (Decrease) In Operating Lease Liabilities, Noncurrent Increase (Decrease) In Operating Lease Liabilities, Noncurrent Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Gross Amounts of Recognized Assets/ Liabilities Derivative Liability, Fair Value, Gross Liability Income tax expense/(benefit) at the statutory income tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Nominal Strike Price Options Nominal Strike Price Options [Member] Nominal Strike Price Options Derivative liabilities Derivative Liability [Abstract] Balance at beginning of period Balance at end of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Cost of product sales Cost of Sales [Member] Inventories Inventory, Policy [Policy Text Block] United Kingdom and United States Current Foreign Tax Expense (Benefit) Acquired Developed Technologies Acquired developed technologies Developed Technology Rights [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Change in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table]