Basis of Presentation and Significant Accounting Policies [Text Block] | Basis of Presentation and Significant Accounting Policies On July 12, 2016, IHS Inc. (IHS), a Delaware corporation, Markit Ltd. (Markit), a Bermuda exempted company, and Marvel Merger Sub, Inc. (Merger Sub), a Delaware corporation and an indirect and wholly owned subsidiary of Markit Ltd., completed a merger (Merger) pursuant to which Merger Sub merged with and into IHS, with IHS surviving the Merger as an indirect and wholly owned subsidiary of Markit. Upon completion of the Merger, Markit became the combined group holding company and was renamed IHS Markit Ltd. (IHS Markit, we, us, or our). The Merger has been accounted for as a business combination in accordance with Accounting Standards Codification (ASC) Topic 805. This standard requires that one of the two companies in the Merger be designated as the acquirer for accounting purposes based on the evidence available. We have treated IHS as the acquiring entity for accounting purposes, and accordingly, the Markit assets acquired and liabilities assumed have been adjusted based on fair value at the consummation of the Merger. Any excess of the purchase price over the fair value of identified assets acquired and liabilities assumed has been recognized as goodwill. In identifying IHS as the acquiring entity for accounting purposes, IHS Markit took into account the voting rights of all equity instruments, the intended corporate governance structure of the combined company, and the size of each of the companies. In assessing the size of each of the companies, IHS Markit evaluated various metrics, including, but not limited to: assets, revenue, operating income, EBITDA, Adjusted EBITDA, market capitalization, and enterprise value. No single factor was the sole determinant in the overall conclusion that IHS is the acquirer for accounting purposes; rather, all factors were considered in arriving at our conclusion. The accompanying unaudited condensed consolidated financial statements of IHS Markit have been prepared on substantially the same basis as our annual consolidated financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended November 30, 2016 . In our opinion, these condensed consolidated financial statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations, and cash flows for the periods presented, and such adjustments are of a normal, recurring nature. Our business has seasonal aspects. Our fourth quarter typically generates our highest quarterly levels of revenue and profit. Conversely, our first quarter generally has our lowest quarterly levels of revenue and profit. We also experience event-driven seasonality in our business; for instance, CERAWeek, an annual energy conference, was held in the first quarter of 2016 and was held early in the second quarter of 2017. Another example is the biennial release of the Boiler Pressure Vessel Code (BPVC) engineering standard, which generates revenue for us predominantly in the third quarter of every other year. The most recent BPVC release was in the third quarter of 2015 and the next release will be in the third quarter of 2017. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, which establishes a comprehensive new revenue recognition model designed to depict the transfer of goods or services to a customer in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The ASU allows for the use of either the full or modified retrospective transition method. In March, April, and May 2016, the FASB issued ASU 2016-08, ASU 2016-10, and ASU 2016-12, respectively, which provide further revenue recognition guidance related to principal versus agent considerations, performance obligations and licensing, and narrow-scope improvements and practical expedients. All of these standards will be effective for us in the first quarter of our fiscal year 2019, although early adoption is permitted. We are currently evaluating the impact of these new standards on our consolidated financial statements, as well as which transition method we intend to use. In August 2014, the FASB issued ASU 2014-15, which requires that management evaluate the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued. Disclosure is required if there is substantial doubt about the entity’s ability to continue as a going concern. The standard will be effective for us in the fourth quarter of our fiscal year 2017, although early adoption is permitted. We do not expect that the adoption of this ASU will have a significant impact on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, which requires that lease assets and lease liabilities be recognized on the balance sheet, and that key information about leasing arrangements be disclosed. The ASU requires the use of a modified retrospective transition method. The standard will be effective for us in the first quarter of our fiscal year 2020, although early adoption is permitted. We are currently evaluating the impact of this new standard on our consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, which changes several aspects of the accounting for stock-based compensation, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. We early adopted this standard in the first quarter of our fiscal year 2017. As a result of the adoption, we now recognize excess tax benefits or deficiencies associated with stock-based compensation award activity in income tax expense in the consolidated statements of operations. For the three and six months ended May 31, 2017, the excess tax benefit associated with stock-based compensation award activity reduced income tax expense by approximately $9.2 million and $23.2 million , respectively. In addition, we now report excess tax benefits associated with award activity as cash flows from operating activities along with all other income tax cash flows, and we have elected to apply this classification change on a prospective basis. The standard also permitted us to make a policy election about how we account for forfeitures, and we have elected to continue to estimate forfeitures. In August 2016, the FASB issued ASU 2016-15, which clarifies how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The ASU should be applied using a retrospective transition method to each period presented. The standard will be effective for us in the first quarter of our fiscal year 2019, although early adoption is permitted. We are currently evaluating the impact of this new standard on our consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, which provides additional guidance about what qualifies as a business combination versus an asset acquisition. The standard will be effective for us in the first quarter of our fiscal year 2019. We do not expect that the adoption of this ASU will have a significant impact on our consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, which removes Step 2 from the goodwill impairment test. The standard will be effective for us in the first quarter of our fiscal year 2021. We do not expect that the adoption of this ASU will have a significant impact on our consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, which requires that the service cost component of pension expense be included in the same line item as other compensation costs arising from services rendered by employees, with the other components of pension expense being classified outside of a subtotal of income from operations. The standard will be effective for us in fiscal year 2019. We do not expect that the adoption of this ASU will have a significant impact on our consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The standard will be effective for us in fiscal year 2019. We do not expect that the adoption of this ASU will have a significant impact on our consolidated financial statements. |