Acquisitions and Other Transactions	3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions and Other Transactions	Acquisitions and Other Transactions On February 28, 2018, the Company and Revance Therapeutics, Inc. (“Revance”) entered into a collaboration agreement (the “Revance Collaboration Agreement”) pursuant to which the Company and Revance will collaborate exclusively, on a world-wide basis (excluding Japan), to develop, manufacture and commercialize a biosimilar to the branded biologic product (onabotulinumtoxinA) marketed as BOTOX®. Under the Revance Collaboration Agreement, the Company will be primarily responsible for (a) clinical development activities outside of North America (excluding Japan) (the “ex-U.S. Mylan territories”), (b) regulatory activities, and (c) commercialization for any approved product. Revance will be primarily responsible for (a) non-clinical development activities, (b) clinical development activities in North America, and (c) manufacturing and supply of clinical drug substance and drug product; Revance will be solely responsible for an initial portion of non-clinical development costs. The remaining portion of any non-clinical development costs and clinical development costs for obtaining approval in the U.S. and Europe will be shared equally between the parties, and the Company will be responsible for all other clinical development costs and commercialization expenses. Upon closing, Revance received a non-refundable upfront payment of $25.0 million. In addition, under the Revance Collaboration Agreement, Revance can receive potential development milestone payments of up to $100.0 million, in the aggregate, upon the achievement of specified clinical and regulatory milestones and potential tiered sales milestones of up to $225.0 million. In addition, Mylan will pay Revance royalties on sales of the biosimilar in the ex-U.S. Mylan territories. The Company accounted for this transaction as an asset acquisition of in-process research and development (“IPR&D”) and the total upfront payment was expensed as a component of R&D expense during the year ended December 31, 2018. On August 31, 2018, the Company completed an agreement with certain subsidiaries of Novartis AG (“Novartis”) to purchase the worldwide rights to their global cystic fibrosis products consisting of the TOBI Podhaler® and TOBI® solution. Tobramycin is the standard of care for treatment of pseudomonas aeruginosa, a leading driver of infection in cystic fibrosis. These products further strengthen our existing presence in cystic fibrosis, especially with our Creon Franchise in Europe, Australia, Japan and Canada. The asset acquisition allows us to further extend our respiratory franchise into rare/orphan disease indications and broaden our portfolio into dry powdered inhalers and nebulized products. Tobi Podhaler™ is manufactured using a proprietary Pulmosphere technology for which we have acquired exclusive rights for use, hence we expect a high barrier for generic entry. Under the terms of the agreement, Novartis is owed fixed consideration of $463.0 million which consists of $240.0 million which was paid at closing as well as deferred payments of $130.0 million included in other current liabilities and $93.0 million included in other long-term obligations, due in 2019 and 2020, respectively. Novartis is also eligible to receive a contingent payment of up to $20 million. The Company also entered into a supply agreement with Novartis to purchase the products for up to three years from the date of closing. The Company has recorded a liability of approximately $91.0 million related to supply obligations. The Company accounted for this transaction as an asset acquisition and recognized an intangible asset for the product rights of $574.8 million. The intangible asset is being amortized over a useful life of ten years. During the year ended December 31, 2018, the Company completed four agreements to acquire certain intellectual property rights and marketing authorizations for products that were in the development stage, including agreements with Fujifilm Kyowa Kirin Biologics Co., Ltd. (“FKB”), Mapi Pharma Ltd., and Lupin Limited. The Company also completed the acquisition of intellectual property rights and marketing authorizations related to a commercialized product in certain rest of world markets for $220.0 million, of which $160.0 million was paid at closing and $20.0 million was paid in the fourth quarter of 2018, with the remaining amount due in 2019 and included in other current liabilities. The Company is accounting for these transactions as asset acquisitions and a useful life of five years is being used to amortize the asset related to the commercialized product. The Company recorded expense of approximately $53.7 million as a component of R&D expense related to non-refundable upfront payments for agreements for products in development during the year ended December 31, 2018. Certain of the agreements include additional development and commercial milestones. On February 22, 2018, the Company in-licensed European rights to Hulio™, a biosimilar to AbbVie Inc.'s (“AbbVie”) Humira® (adalimumab), including a sub-license to certain of AbbVie’s European patents, from FKB. On February 27, 2019, the Company updated its arrangements with FKB for the commercialization of Hulio™. Under the updated arrangements, Mylan has in-licensed exclusive global commercialization rights for Hulio™. The Company accounted for this transaction as an asset acquisition of IPR&D and a net non-contingent amount due to FKB of approximately $23.3 million was expensed as a component of R&D expense during the three months ended March 31, 2019. On December 1, 2018, the Company and certain subsidiaries of Aspen Pharmacare Holdings Limited entered into an agreement for Mylan to distribute a portfolio of prescription and over-the-counter (“OTC”) products in Australia and New Zealand. The agreement includes an option for Mylan to purchase the rights to the portfolio for approximately $135.0 million. In March 2019, the Company exercised the option, and the parties began negotiating an asset purchase agreement. The consideration of approximately $135.0 million includes a payment due at closing of approximately $64.0 million and an amount due one year later of approximately $71.0 million. An agreement is expected to be finalized in 2019. Completion of the transaction will be subject to customary closing conditions.

Acquisitions and Other Transactions

On February 28, 2018, the Company and Revance Therapeutics, Inc. (“Revance”) entered into a collaboration agreement (the “Revance Collaboration Agreement”) pursuant to which the Company and Revance will collaborate exclusively, on a world-wide basis (excluding Japan), to develop, manufacture and commercialize a biosimilar to the branded biologic product (onabotulinumtoxinA) marketed as BOTOX®.

Under the Revance Collaboration Agreement, the Company will be primarily responsible for (a) clinical development activities outside of North America (excluding Japan) (the “ex-U.S. Mylan territories”), (b) regulatory activities, and (c) commercialization for any approved product. Revance will be primarily responsible for (a) non-clinical development activities, (b) clinical development activities in North America, and (c) manufacturing and supply of clinical drug substance and drug product; Revance will be solely responsible for an initial portion of non-clinical development costs. The remaining portion of any non-clinical development costs and clinical development costs for obtaining approval in the U.S. and Europe will be shared equally between the parties, and the Company will be responsible for all other clinical development costs and commercialization expenses. Upon closing, Revance received a non-refundable upfront payment of $25.0 million. In addition, under the Revance Collaboration Agreement, Revance can receive potential development milestone payments of up to $100.0 million, in the aggregate, upon the achievement of specified clinical and regulatory milestones and potential tiered sales milestones of up to $225.0 million. In addition, Mylan will pay Revance royalties on sales of the biosimilar in the ex-U.S. Mylan territories. The Company accounted for this transaction as an asset acquisition of in-process research and development (“IPR&D”) and the total upfront payment was expensed as a component of R&D expense during the year ended December 31, 2018.

On August 31, 2018, the Company completed an agreement with certain subsidiaries of Novartis AG (“Novartis”) to purchase the worldwide rights to their global cystic fibrosis products consisting of the TOBI Podhaler® and TOBI® solution. Tobramycin is the standard of care for treatment of pseudomonas aeruginosa, a leading driver of infection in cystic fibrosis. These products further strengthen our existing presence in cystic fibrosis, especially with our Creon Franchise in Europe, Australia, Japan and Canada. The asset acquisition allows us to further extend our respiratory franchise into rare/orphan disease indications and broaden our portfolio into dry powdered inhalers and nebulized products. Tobi Podhaler™ is manufactured using a proprietary Pulmosphere technology for which we have acquired exclusive rights for use, hence we expect a high barrier for generic entry.

Under the terms of the agreement, Novartis is owed fixed consideration of $463.0 million which consists of $240.0 million which was paid at closing as well as deferred payments of $130.0 million included in other current liabilities and $93.0 million included in other long-term obligations, due in 2019 and 2020, respectively. Novartis is also eligible to receive a contingent payment of up to $20 million. The Company also entered into a supply agreement with Novartis to purchase the products for up to three years from the date of closing. The Company has recorded a liability of approximately $91.0 million related to supply obligations.

The Company accounted for this transaction as an asset acquisition and recognized an intangible asset for the product rights of $574.8 million. The intangible asset is being amortized over a useful life of ten years.

During the year ended December 31, 2018, the Company completed four agreements to acquire certain intellectual property rights and marketing authorizations for products that were in the development stage, including agreements with Fujifilm Kyowa Kirin Biologics Co., Ltd. (“FKB”), Mapi Pharma Ltd., and Lupin Limited. The Company also completed the acquisition of intellectual property rights and marketing authorizations related to a commercialized product in certain rest of world markets for $220.0 million, of which $160.0 million was paid at closing and $20.0 million was paid in the fourth quarter of 2018, with the remaining amount due in 2019 and included in other current liabilities. The Company is accounting for these transactions as asset acquisitions and a useful life of five years is being used to amortize the asset related to the commercialized product. The Company recorded expense of approximately $53.7 million as a component of R&D expense related to non-refundable upfront payments for agreements for products in development during the year ended December 31, 2018. Certain of the agreements include additional development and commercial milestones.

On February 22, 2018, the Company in-licensed European rights to Hulio™, a biosimilar to AbbVie Inc.'s (“AbbVie”) Humira® (adalimumab), including a sub-license to certain of AbbVie’s European patents, from FKB. On February 27, 2019, the Company updated its arrangements with FKB for the commercialization of Hulio™. Under the updated arrangements, Mylan has in-licensed exclusive global commercialization rights for Hulio™. The Company accounted for this transaction as an asset acquisition of IPR&D and a net non-contingent amount due to FKB of approximately $23.3 million was expensed as a component of R&D expense during the three months ended March 31, 2019.

On December 1, 2018, the Company and certain subsidiaries of Aspen Pharmacare Holdings Limited entered into an agreement for Mylan to distribute a portfolio of prescription and over-the-counter (“OTC”) products in Australia and New Zealand. The agreement includes an option for Mylan to purchase the rights to the portfolio for approximately $135.0 million. In March 2019, the Company exercised the option, and the parties began negotiating an asset purchase agreement. The consideration of approximately $135.0 million includes a payment due at closing of approximately $64.0 million and an amount due one year later of approximately $71.0 million. An agreement is expected to be finalized in 2019. Completion of the transaction will be subject to customary closing conditions.