New Accounting Standards	12 Months Ended
Dec. 31, 2017
New Accounting Standards [Abstract]
New Accounting Standards	New Accounting Standards Effective January 1, 2018, we will adopt FASB ASC Topic 606, Revenue from Contracts with Customers, or ASC 606. As a result, we will change our revenue recognition accounting policy as described below. ASC 606 will be applied using the modified retrospective method, where the cumulative effect of the initial application is recognized as an adjustment to opening retained earnings at January 1, 2018 and is not expected to have a material impact on our financial position. ASC 606 provides a five-step model where revenue is recognized when the customer obtains control of the promised goods or services in an amount that reflects the consideration that we expect to receive in exchange for those goods or services. The adoption of ASC 606 will not have a material impact on how we recognize revenue for fixed fee or retainer based arrangements. Clients typically receive the benefit of our services as we perform. We will continue to recognize revenue over time using inputs or outputs to measure our progress. Revenue for commission based arrangements will continue to be recognized at a point-in-time. ASC 606 also includes additional disclosure requirements. For certain of our businesses, the adoption of ASC 606 will result in a change in our accounting policy for certain third-party out-of-pocket costs, which are incurred in connection with our services and are billed to clients. The inclusion of third-party out-of-pocket costs in revenue depends on whether we act as a principal or agent in the client arrangement. Under ASC 606, the principal versus agent assessment is based on whether we control the specified goods or services before they are transferred to the customer. As a result of the adoption of ASC 606, certain third-party costs are no longer included in revenue and cost of services. This change will reduce reported revenue and will have no impact on operating profit. In addition, performance incentives that can increase revenue if we meet certain quantitative or qualitative objectives in delivering our services will be treated as variable consideration. Performance incentives were recognized in revenue when specific quantitative goals were achieved, or when our performance against qualitative goals was acknowledged by the client. Under ASC 606, variable consideration is estimated and included in total consideration at contract inception based on either the expected value method or the most likely method. These estimates are based on historical award experience, anticipated performance and our best judgment at the time. This change will have offsetting effects in each period and the net effect will not be material to our results of operations or financial position. In February 2016, the FASB issued ASU 2016-02, Leases, or ASU 2016-02, which will supersede the current guidance for lease accounting and will require lessees to recognize the right-to-use assets and related lease liabilities on the balance sheet. ASU 2016-02 is effective for annual and interim periods beginning after December 15, 2018 and early adoption is permitted. ASU 2016-02 provides for a modified retrospective application for leases existing at, or entered into after, the earliest comparative period presented in the financial statements. We will adopt ASU 2016-02 on January 1, 2019. While we are not yet in a position to assess the full impact of the application of the new standard, we expect that the impact of recording the lease liabilities and the corresponding right-to-use assets will have a significant impact on our total assets and liabilities with a minimal impact on our equity and no effect on results of operations. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, or ASU 2016-01, which revises the classification and measurement of investments in equity securities. ASU 2016-01 requires equity investments, except those accounted for under the equity method of accounting, be measured at fair value and changes in fair value will be recognized in net income. ASU 2016-01 is effective on January 1, 2018 using a cumulative-effect adjustment to opening retained earnings. We do not expect that the adoption of ASU 2016-01 will not have a significant impact on our financial position or results of operations. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments, or ASU 2016-13, which changes the impairment model for most financial assets. The new model uses a forward-looking expected loss method, which will generally result in earlier recognition of allowances for losses. ASU 2016-13 is effective for annual and interim periods beginning after December 15, 2019 and early adoption is permitted for annual and interim periods beginning after December 15, 2018. We will adopt ASU 2016-13 on January 1, 2020. However, we are not yet in a position to assess the impact of the new standard on our results of operations or financial position. In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits, or ASU 2017-07, which requires that only the service cost component of periodic benefit cost is recorded in salary and service cost. All other components of net periodic benefit cost are presented separately and are excluded from operating profit. ASU 2017-07 is effective on January 1, 2018 using the full retrospective method. The adoption of ASU 2017-07 will have the affect of increasing operating profit but will have no effect on income before income taxes and equity method investments, net income or earnings per share.

New Accounting Standards

Effective January 1, 2018, we will adopt FASB ASC Topic 606, Revenue from Contracts with Customers, or ASC 606. As a result, we will change our revenue recognition accounting policy as described below. ASC 606 will be applied using the modified retrospective method, where the cumulative effect of the initial application is recognized as an adjustment to opening retained earnings at January 1, 2018 and is not expected to have a material impact on our financial position. ASC 606 provides a five-step model where revenue is recognized when the customer obtains control of the promised goods or services in an amount that reflects the consideration that we expect to receive in exchange for those goods or services. The adoption of ASC 606 will not have a material impact on how we recognize revenue for fixed fee or retainer based arrangements. Clients typically receive the benefit of our services as we perform. We will continue to recognize revenue over time using inputs or outputs to measure our progress. Revenue for commission based arrangements will continue to be recognized at a point-in-time. ASC 606 also includes additional disclosure requirements.

For certain of our businesses, the adoption of ASC 606 will result in a change in our accounting policy for certain third-party out-of-pocket costs, which are incurred in connection with our services and are billed to clients. The inclusion of third-party out-of-pocket costs in revenue depends on whether we act as a principal or agent in the client arrangement. Under ASC 606, the principal versus agent assessment is based on whether we control the specified goods or services before they are transferred to the customer. As a result of the adoption of ASC 606, certain third-party costs are no longer included in revenue and cost of services. This change will reduce reported revenue and will have no impact on operating profit.

In addition, performance incentives that can increase revenue if we meet certain quantitative or qualitative objectives in delivering our services will be treated as variable consideration. Performance incentives were recognized in revenue when specific quantitative goals were achieved, or when our performance against qualitative goals was acknowledged by the client. Under ASC 606, variable consideration is estimated and included in total consideration at contract inception based on either the expected value method or the most likely method. These estimates are based on historical award experience, anticipated performance and our best judgment at the time. This change will have offsetting effects in each period and the net effect will not be material to our results of operations or financial position.

In February 2016, the FASB issued ASU 2016-02, Leases, or ASU 2016-02, which will supersede the current guidance for lease accounting and will require lessees to recognize the right-to-use assets and related lease liabilities on the balance sheet. ASU 2016-02 is effective for annual and interim periods beginning after December 15, 2018 and early adoption is permitted. ASU 2016-02 provides for a modified retrospective application for leases existing at, or entered into after, the earliest comparative period presented in the financial statements. We will adopt ASU 2016-02 on January 1, 2019. While we are not yet in a position to assess the full impact of the application of the new standard, we expect that the impact of recording the lease liabilities and the corresponding right-to-use assets will have a significant impact on our total assets and liabilities with a minimal impact on our equity and no effect on results of operations.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, or ASU 2016-01, which revises the classification and measurement of investments in equity securities. ASU 2016-01 requires equity investments, except those accounted for under the equity method of accounting, be measured at fair value and changes in fair value will be recognized in net income. ASU 2016-01 is effective on January 1, 2018 using a cumulative-effect adjustment to opening retained earnings. We do not expect that the adoption of ASU 2016-01 will not have a significant impact on our financial position or results of operations.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments, or ASU 2016-13, which changes the impairment model for most financial assets. The new model uses a forward-looking expected loss method, which will generally result in earlier recognition of allowances for losses. ASU 2016-13 is effective for annual and interim periods beginning after December 15, 2019 and early adoption is permitted for annual and interim periods beginning after December 15, 2018. We will adopt ASU 2016-13 on January 1, 2020. However, we are not yet in a position to assess the impact of the new standard on our results of operations or financial position.

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits, or ASU 2017-07, which requires that only the service cost component of periodic benefit cost is recorded in salary and service cost. All other components of net periodic benefit cost are presented separately and are excluded from operating profit. ASU 2017-07 is effective on January 1, 2018 using the full retrospective method. The adoption of ASU 2017-07 will have the affect of increasing operating profit but will have no effect on income before income taxes and equity method investments, net income or earnings per share.