Basis of Presentation	9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Note 1: Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared under accounting principles generally accepted in the United States ("U.S. GAAP" or "GAAP") and in conformity with rules applicable to quarterly financial information. The Condensed Consolidated Financial Statements as of September 30, 2018 and for the three and nine months ended September 30, 2018 and 2017 are unaudited. All adjustments, consisting of normal recurring adjustments, except as otherwise noted, considered necessary for a fair presentation of the unaudited interim Condensed Consolidated Financial Statements for these interim periods have been included. Readers of this unaudited consolidated quarterly financial information should refer to the audited Consolidated Financial Statements and notes to the Consolidated Financial Statements of Cushman & Wakefield plc and its subsidiaries (“Cushman & Wakefield,” the "Company,” “we,” “our” and “us”) for the year ended December 31, 2017 included in our final prospectus (the "Prospectus") as filed with the Securities and Exchange Commission (the "SEC") on August 3, 2018, pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the "Securities Act"). Certain footnote disclosures that would substantially duplicate those contained in such audited financial statements or which are not required by the rules and regulations of the SEC for interim financial reporting have been condensed or omitted. The Prospectus was filed in connection with our initial public offering ("IPO") of ordinary shares that took place in the third quarter of 2018. Public trading in the Company's ordinary shares began on August 2, 2018. Refer to Note 2: Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company's audited Consolidated Financial Statements for the year ended December 31, 2017 for further discussion of the Company's accounting policies and estimates. Due to seasonality, the results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of the results of operations to be expected for the year ended December 31, 2018. The Company provides for the effects of income taxes on interim financial statements based on estimates of the effective tax rate for the full year, which is based on forecasted income by country and enacted tax rates. On July 6, 2018, the shareholders of DTZ Jersey Holdings Limited exchanged their shares in DTZ Jersey Holdings Limited for interests in newly issued shares of Cushman & Wakefield Limited, a private limited company incorporated in England and Wales (the “Share Exchange”). On July 12, 2018, Cushman & Wakefield Limited reduced the nominal value of each ordinary share issued to $0.01 (the “Capital Reduction”). On July 19, 2018, Cushman & Wakefield Limited re-registered as a public limited company organized under the laws of England and Wales (the “Re-registration”) named Cushman & Wakefield plc. Following the Re-registration, the Company undertook a share consolidation of its outstanding ordinary shares (the “Share Consolidation”), which resulted in a proportional decrease in the number of ordinary shares outstanding as well as corresponding adjustments to outstanding options and restricted share units on a 10 for 1 basis. The transactions described above are collectively referred to herein as the “Corporate Reorganization”. As a result of the Capital Reduction, the Company’s ordinary shares have a nominal value of $0.10. On August 6, 2018, the Company completed an IPO of its ordinary shares in which it issued and sold 51.8 million ordinary shares at a price of $17.00 per share. On August 6 and 7, 2018, the Company completed a concurrent private placement (the "Concurrent Private Placement") of its ordinary shares in which it sold 10.6 million shares to Vanke Service (Hong Kong) Co., Limited ("Vanke Service") at a price of $17.00 per share. The IPO and Concurrent Private Placement resulted in net proceeds of approximately $1.0 billion after deducting offering fees and other direct incremental costs. Tax Act Update On December 22, 2017, H.R. 1, the Tax Cuts and Jobs Act ("the Tax Act") was enacted. The Tax Act significantly revised the U.S. corporate income tax regime by, among other things, (i) lowering the U.S. corporate rate from 35% to 21% effective January 1, 2018, (ii) implementing a new tax system on non-U.S. earnings and imposing a one-time repatriation tax ("transition tax") on earnings of foreign subsidiaries not previously taxed in the U.S. payable over an eight-year period, (iii) limitations on the deductibility of interest expense and executive compensation, (iv) creation of a new minimum tax otherwise known as the Base Erosion Anti-Abuse Tax ("BEAT") and (v) a requirement that certain income such as Global Intangible Low-Taxed Income ("GILTI") earned by foreign subsidiaries be included in U.S. taxable income. U.S. GAAP requires the impact of tax legislation to be recognized in the period in which the law was enacted. As a result of additional information and analysis during the period, the net benefit as of September 30, 2018 is approximately $93.1 million, an increase of $32.2 million from December 31, 2017 and an increase of $10.0 million from June 30, 2018. This increase from amounts calculated as of December 31, 2017 resulted from a $0.7 million increase in the tax benefit to $124.9 million from $124.2 million and a $31.5 million decrease in tax expense due to increased foreign tax credit utilization from $63.3 million to $31.8 million. Amounts were recorded in Benefit from income taxes in the unaudited condensed consolidated statement of operations. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 ("SAB 118"), Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. The remeasurement of the net deferred tax liabilities as well as the transition tax represent provisional amounts and the Company’s current best estimate. The provisional amounts incorporate assumptions that have been made based upon the Company’s current interpretation of the Tax Act and may change as a result of the Company completing further analysis, changes in the Company's interpretations and assumptions, additional regulatory guidance that may be issued and actions the Company may take as a result of the Tax Act. Any adjustments recorded to the provisional amounts through the SAB 118 measurement period ending December 31, 2018 will be included in the statement of operations as an adjustment to the tax provision. Because of the complexity of the new GILTI tax rules, the Company continues to evaluate this provision of the Tax Act and the application of Accounting Standards Codification ("ASC") 740, Income Taxes. Under U.S. GAAP, the Company is allowed to make an accounting policy choice of either (1) treating taxes due on future U.S. inclusions in taxable income related to GILTI as a current-period expense when incurred (the “period cost method”) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the “deferred method”). The Company has analyzed its structure and, as a result, has estimated the effect of this provision of the Tax Act to be $8.1 million of expense in 2018, a decrease of $3.4 million in the estimate recorded for the six months ended June 30, 2018. The Company has elected to treat taxes due on future U.S. inclusions in taxable income related to GILTI under the period cost method and has included the estimate of $8.1 million in 2018 as a current-period expense. Additionally, the Company is estimating a Subpart F inclusion tax liability of $6.0 million in 2018 as a current-period expense.

Note 1: Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements have been prepared under accounting principles generally accepted in the United States ("U.S. GAAP" or "GAAP") and in conformity with rules applicable to quarterly financial information. The Condensed Consolidated Financial Statements as of September 30, 2018 and for the three and nine months ended September 30, 2018 and 2017 are unaudited. All adjustments, consisting of normal recurring adjustments, except as otherwise noted, considered necessary for a fair presentation of the unaudited interim Condensed Consolidated Financial Statements for these interim periods have been included.

Readers of this unaudited consolidated quarterly financial information should refer to the audited Consolidated Financial Statements and notes to the Consolidated Financial Statements of Cushman & Wakefield plc and its subsidiaries (“Cushman & Wakefield,” the "Company,” “we,” “our” and “us”) for the year ended December 31, 2017 included in our final prospectus (the "Prospectus") as filed with the Securities and Exchange Commission (the "SEC") on August 3, 2018, pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the "Securities Act"). Certain footnote disclosures that would substantially duplicate those contained in such audited financial statements or which are not required by the rules and regulations of the SEC for interim financial reporting have been condensed or omitted.

The Prospectus was filed in connection with our initial public offering ("IPO") of ordinary shares that took place in the third quarter of 2018. Public trading in the Company's ordinary shares began on August 2, 2018.

Refer to Note 2: Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company's audited Consolidated Financial Statements for the year ended December 31, 2017 for further discussion of the Company's accounting policies and estimates.

Due to seasonality, the results of operations for the three and nine months ended September 30, 2018 are not necessarily indicative of the results of operations to be expected for the year ended December 31, 2018.

The Company provides for the effects of income taxes on interim financial statements based on estimates of the effective tax rate for the full year, which is based on forecasted income by country and enacted tax rates.

On July 6, 2018, the shareholders of DTZ Jersey Holdings Limited exchanged their shares in DTZ Jersey Holdings Limited for interests in newly issued shares of Cushman & Wakefield Limited, a private limited company incorporated in England and Wales (the “Share Exchange”). On July 12, 2018, Cushman & Wakefield Limited reduced the nominal value of each ordinary share issued to $0.01 (the “Capital Reduction”). On July 19, 2018, Cushman & Wakefield Limited re-registered as a public limited company organized under the laws of England and Wales (the “Re-registration”) named Cushman & Wakefield plc. Following the Re-registration, the Company undertook a share consolidation of its outstanding ordinary shares (the “Share Consolidation”), which resulted in a proportional decrease in the number of ordinary shares outstanding as well as corresponding adjustments to outstanding options and restricted share units on a 10 for 1 basis. The transactions described above are collectively referred to herein as the “Corporate Reorganization”. As a result of the Capital Reduction, the Company’s ordinary shares have a nominal value of $0.10.

On August 6, 2018, the Company completed an IPO of its ordinary shares in which it issued and sold 51.8 million ordinary shares at a price of $17.00 per share. On August 6 and 7, 2018, the Company completed a concurrent private placement (the "Concurrent Private Placement") of its ordinary shares in which it sold 10.6 million shares to Vanke Service (Hong Kong) Co., Limited ("Vanke Service") at a price of $17.00 per share. The IPO and Concurrent Private Placement resulted in net proceeds of approximately $1.0 billion after deducting offering fees and other direct incremental costs.

Tax Act Update

On December 22, 2017, H.R. 1, the Tax Cuts and Jobs Act ("the Tax Act") was enacted. The Tax Act significantly revised the U.S. corporate income tax regime by, among other things, (i) lowering the U.S. corporate rate from 35% to 21% effective January 1, 2018, (ii) implementing a new tax system on non-U.S. earnings and imposing a one-time repatriation tax ("transition tax") on earnings of foreign subsidiaries not previously taxed in the U.S. payable over an eight-year period, (iii) limitations on the deductibility of interest expense and executive compensation, (iv) creation of a new minimum tax otherwise known as the Base Erosion Anti-Abuse Tax ("BEAT") and (v) a requirement that certain income such as Global Intangible Low-Taxed Income ("GILTI") earned by foreign subsidiaries be included in U.S. taxable income. U.S. GAAP requires the impact of tax legislation to be recognized in the period in which the law was enacted. As a result of additional information and analysis during the period, the net benefit as of September 30, 2018 is approximately $93.1 million, an increase of $32.2 million from December 31, 2017 and an increase of $10.0 million from June 30, 2018. This increase from amounts calculated as of December 31, 2017 resulted from a $0.7 million increase in the tax benefit to $124.9 million from $124.2 million and a $31.5 million decrease in tax expense due to increased foreign tax credit utilization from $63.3 million to $31.8 million. Amounts were recorded in Benefit from income taxes in the unaudited condensed consolidated statement of operations.

In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 ("SAB 118"), Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. The remeasurement of the net deferred tax liabilities as well as the transition tax represent provisional amounts and the Company’s current best estimate. The provisional amounts incorporate assumptions that have been made based upon the Company’s current interpretation of the Tax Act and may change as a result of the Company completing further analysis, changes in the Company's interpretations and assumptions, additional regulatory guidance that may be issued and actions the Company may take as a result of the Tax Act. Any adjustments recorded to the provisional amounts through the SAB 118 measurement period ending December 31, 2018 will be included in the statement of operations as an adjustment to the tax provision.

Because of the complexity of the new GILTI tax rules, the Company continues to evaluate this provision of the Tax Act and the application of Accounting Standards Codification ("ASC") 740, Income Taxes. Under U.S. GAAP, the Company is allowed to make an accounting policy choice of either (1) treating taxes due on future U.S. inclusions in taxable income related to GILTI as a current-period expense when incurred (the “period cost method”) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the “deferred method”). The Company has analyzed its structure and, as a result, has estimated the effect of this provision of the Tax Act to be $8.1 million of expense in 2018, a decrease of $3.4 million in the estimate recorded for the six months ended June 30, 2018. The Company has elected to treat taxes due on future U.S. inclusions in taxable income related to GILTI under the period cost method and has included the estimate of $8.1 million in 2018 as a current-period expense. Additionally, the Company is estimating a Subpart F inclusion tax liability of $6.0 million in 2018 as a current-period expense.