Legal and Other Proceedings	3 Months Ended
Mar. 31, 2018
Legal Proceedings [Abstract]
Legal and Other Proceedings	Legal and Other Proceedings The Company expenses legal costs when incurred. The Company recognizes loss contingency provisions for probable losses when management is able to reasonably estimate the loss. When the estimated loss lies within a range, the Company records a loss contingency provision based on its best estimate of the probable loss. If no particular amount within that range is a better estimate than any other amount, the minimum amount is recorded. Estimates of losses may be developed before the ultimate loss is known, and are therefore refined each accounting period as additional information becomes known. An outcome that deviates from the Company’s estimate may result in an additional expense or release in a future accounting period. As of March 31, 2018, provision for litigation losses, insurance claims, and other disputes totaled $79.5 million (December 31, 2017: $76.2 million). The Company’s principal pending legal and other proceedings are disclosed below. The outcomes of these proceedings are not always predictable and can be affected by various factors. For those legal and other proceedings for which it is considered at least reasonably possible that a loss has been incurred, the Company discloses the possible loss or range of possible loss in excess of the recorded loss contingency provision, if any, where such excess is both material and estimable. MYDAYIS On October 12, 2017, Shire was notified that Teva Pharmaceuticals USA, Inc. had submitted an abbreviated new drug application (ANDA) to the FDA seeking permission to market a generic version of MYDAYIS. Within the requisite 45-day period, Shire filed a lawsuit in the U.S. District Court for the District of Delaware against Teva Pharmaceuticals USA, Inc., Actavis Laboratories, Inc. and Teva Pharmaceutical Industries Limited (collectively the “Teva entities”). No dates for a Markman hearing or trial have been set. On March 8, 2018, Shire was notified that Impax Laboratories, Inc. (Impax) had submitted an ANDA to the FDA seeking permission to market a generic version of MYDAYIS. Within the requisite 45-day period, Shire filed a lawsuit in the U.S. District Court for the District of Delaware against Impax. No dates for a Markman hearing or trial have been set. On April 19, 2018, Shire was notified that SpecGX LLC (SpecGX) had submitted an ANDA to the FDA seeking permission to market a generic version of MYDAYIS. Shire is currently reviewing the contents of the notification. In the event Shire files a lawsuit within 45 days of receipt of the letter, a stay of approval of up to thirty months will be in effect with respect to the SpecGX ANDA. Petitions to institute inter partes reviews (IPRs) against U.S. Patent numbers 8,846,100 and 9,173,857 were filed by KVK Tech. Both of these patents are listed in the Orange Book as covering MYDAYIS and are among the patents-in-suit in the infringement action brought against the Teva entities and Impax as noted above. A decision on whether to institute the IPRs is expected on or before July 10, 2018. If one or both IPRs are instituted, a decision on the merits is expected on or before July 10, 2019. VANCOCIN On April 6, 2012, ViroPharma Incorporated (ViroPharma) received a notification that the United States Federal Trade Commission (FTC) was conducting an investigation into whether ViroPharma had engaged in unfair methods of competition with respect to VANCOCIN, which Shire acquired in January 2014. Following the divestiture of VANCOCIN in August 2014, Shire retained certain liabilities including any potential liabilities related to the VANCOCIN citizen petition. On August 3, 2012, and September 8, 2014, ViroPharma and Shire respectively received Civil Investigative Demands from the FTC requesting additional information related to this matter. Shire has fully cooperated with the FTC’s investigation. On February 7, 2017, the FTC filed a Complaint against Shire alleging that ViroPharma engaged in conduct in violation of U.S. antitrust laws arising from a citizen petition ViroPharma filed in 2006 related to Food & Drug Administration’s policy for evaluating bioequivalence for generic versions of VANCOCIN. The complaint seeks equitable relief, including an injunction and disgorgement. The Company filed a motion to dismiss on April 10, 2017. On March 20, 2018, the court granted the Company’s motion. On April 11, 2018, the FTC filed a Notice of Appeal. At this time, Shire is unable to predict the outcome or duration of this case. ELAPRASE On September 24, 2014, Shire’s Brazilian affiliate, Shire Farmaceutica Brasil Ltda, was served with a lawsuit brought by the State of Sao Paulo and in which the Brazilian Public Attorney’s office has intervened alleging that Shire is obligated to provide certain medical care including ELAPRASE for an indefinite period at no cost to patients who participated in ELAPRASE clinical trials in Brazil, and seeking recoupment to the Brazilian government for amounts paid on behalf of these patients to date, and moral damages associated with these claims. On May 6, 2016, the trial court judge ruled on the case and dismissed all the claims under the class action, which was appealed. On February 20, 2017, the Court of Appeals in Sao Paulo issued the final decision on merit in favor of Shire and dismissed all the claims under the class action. On July 12, 2017, the Public Prosecutor filed an appeal addressed to the Supreme Court. During the last quarter of 2017, the State of Sao Paulo filed appeals addressed to the Superior Court of Justice and to the Supreme Court.

Legal and Other Proceedings

The Company expenses legal costs when incurred.

The Company recognizes loss contingency provisions for probable losses when management is able to reasonably estimate the loss. When the estimated loss lies within a range, the Company records a loss contingency provision based on its best estimate of the probable loss. If no particular amount within that range is a better estimate than any other amount, the minimum amount is recorded. Estimates of losses may be developed before the ultimate loss is known, and are therefore refined each accounting period as additional information becomes known. An outcome that deviates from the Company’s estimate may result in an additional expense or release in a future accounting period. As of March 31, 2018, provision for litigation losses, insurance claims, and other disputes totaled $79.5 million (December 31, 2017: $76.2 million).

The Company’s principal pending legal and other proceedings are disclosed below. The outcomes of these proceedings are not always predictable and can be affected by various factors. For those legal and other proceedings for which it is considered at least reasonably possible that a loss has been incurred, the Company discloses the possible loss or range of possible loss in excess of the recorded loss contingency provision, if any, where such excess is both material and estimable.

MYDAYIS

On October 12, 2017, Shire was notified that Teva Pharmaceuticals USA, Inc. had submitted an abbreviated new drug application (ANDA) to the FDA seeking permission to market a generic version of MYDAYIS. Within the requisite 45-day period, Shire filed a lawsuit in the U.S. District Court for the District of Delaware against Teva Pharmaceuticals USA, Inc., Actavis Laboratories, Inc. and Teva Pharmaceutical Industries Limited (collectively the “Teva entities”). No dates for a Markman hearing or trial have been set.

On March 8, 2018, Shire was notified that Impax Laboratories, Inc. (Impax) had submitted an ANDA to the FDA seeking permission to market a generic version of MYDAYIS. Within the requisite 45-day period, Shire filed a lawsuit in the U.S. District Court for the District of Delaware against Impax. No dates for a Markman hearing or trial have been set.

On April 19, 2018, Shire was notified that SpecGX LLC (SpecGX) had submitted an ANDA to the FDA seeking permission to market a generic version of MYDAYIS. Shire is currently reviewing the contents of the notification. In the event Shire files a lawsuit within 45 days of receipt of the letter, a stay of approval of up to thirty months will be in effect with respect to the SpecGX ANDA.

Petitions to institute inter partes reviews (IPRs) against U.S. Patent numbers 8,846,100 and 9,173,857 were filed by KVK Tech. Both of these patents are listed in the Orange Book as covering MYDAYIS and are among the patents-in-suit in the infringement action brought against the Teva entities and Impax as noted above. A decision on whether to institute the IPRs is expected on or before July 10, 2018. If one or both IPRs are instituted, a decision on the merits is expected on or before July 10, 2019.

VANCOCIN

On April 6, 2012, ViroPharma Incorporated (ViroPharma) received a notification that the United States Federal Trade Commission (FTC) was conducting an investigation into whether ViroPharma had engaged in unfair methods of competition with respect to VANCOCIN, which Shire acquired in January 2014. Following the divestiture of VANCOCIN in August 2014, Shire retained certain liabilities including any potential liabilities related to the VANCOCIN citizen petition.

On August 3, 2012, and September 8, 2014, ViroPharma and Shire respectively received Civil Investigative Demands from the FTC requesting additional information related to this matter. Shire has fully cooperated with the FTC’s investigation.

On February 7, 2017, the FTC filed a Complaint against Shire alleging that ViroPharma engaged in conduct in violation of U.S. antitrust laws arising from a citizen petition ViroPharma filed in 2006 related to Food & Drug Administration’s policy for evaluating bioequivalence for generic versions of VANCOCIN. The complaint seeks equitable relief, including an injunction and disgorgement. The Company filed a motion to dismiss on April 10, 2017. On March 20, 2018, the court granted the Company’s motion. On April 11, 2018, the FTC filed a Notice of Appeal.

At this time, Shire is unable to predict the outcome or duration of this case.

ELAPRASE

On September 24, 2014, Shire’s Brazilian affiliate, Shire Farmaceutica Brasil Ltda, was served with a lawsuit brought by the State of Sao Paulo and in which the Brazilian Public Attorney’s office has intervened alleging that Shire is obligated to provide certain medical care including ELAPRASE for an indefinite period at no cost to patients who participated in ELAPRASE clinical trials in Brazil, and seeking recoupment to the Brazilian government for amounts paid on behalf of these patients to date, and moral damages associated with these claims.

On May 6, 2016, the trial court judge ruled on the case and dismissed all the claims under the class action, which was appealed. On February 20, 2017, the Court of Appeals in Sao Paulo issued the final decision on merit in favor of Shire and dismissed all the claims under the class action. On July 12, 2017, the Public Prosecutor filed an appeal addressed to the Supreme Court. During the last quarter of 2017, the State of Sao Paulo filed appeals addressed to the Superior Court of Justice and to the Supreme Court.