The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America (GAAP) requires the use of estimates and assumptions related to the reporting of assets, liabilities, revenues, expenses and related disclosures. Actual results could differ from these estimates. Significant estimates and assumptions were used to review goodwill and other long-lived assets for impairment (see Notes 7 and 13), environmental liabilities (see Notes 16 and 17), product warranty liabilities (see Note 16), long-term incentive compensation plan obligations (see Note 21), retiree medical and pension obligations (see Notes 22 and 23), income taxes (see Note 24), and contingencies including asbestos (see Note 25).

In the normal course of business, the company provides credit to customers. The company limits its credit risk by performing ongoing credit evaluations of its customers and maintaining reserves for potential credit losses and through accounts receivable factoring programs. The company’s accounts receivables are generally due from medium- and heavy-duty truck OEMs, specialty vehicle manufacturers, aftermarket customers, and trailer producers. The company’s ten largest customers accounted for 77 percent, 75 percent and 74 percent of sales in fiscal years 2019, 2018 and 2017, respectively. Sales to the company's top three customers were 54 percent, 52 percent and 49 percent of total sales in fiscal years 2019, 2018 and 2017, respectively. At September 30, 2019 and 2018, 26 percent and 23 percent of the company's trade accounts receivable were from the company's three largest customers.

The Consolidated Financial Statements include the accounts of the company and those subsidiaries in which the company has control. All intercompany balances and transactions are eliminated in consolidation. The results of operations of controlled subsidiaries are included in the Consolidated Financial Statements and are offset by a related noncontrolling interest recorded for the noncontrolling partners’ ownership. Investments in affiliates that are not controlled are reported using the equity method of accounting (see Note 15).

Local currencies are generally considered the functional currencies for operations outside the U.S. For operations reporting in local currencies, assets and liabilities are translated at year-end exchange rates with cumulative currency translation adjustments included as a component of Accumulated Other Comprehensive Loss in the Consolidated Balance Sheet. Income and expense items are translated at average rates of exchange during the year.

In November 2018, the Board of Directors approved a grant of performance share units to all executives eligible to participate in the company's long-term incentive plan. Each performance share unit represents the right to receive one share of common stock or its cash equivalent upon achievement of certain performance and time vesting criteria. The fair value of each performance share unit was $16.50, which was the company’s share price on the grant date of December 1, 2018. The Board of Directors also approved a grant of 0.4 million restricted share units to these executives. The restricted share units vest at the earlier of three years from the date of grant or upon termination of employment with the company under certain circumstances. The fair value of each restricted share unit was $16.50, which was the company's share price on the grant date of December 1, 2018.

The actual number of performance share units that will vest depends upon the company’s performance relative to the established performance metrics for the three-year performance period of October 1, 2018 to September 30, 2021, measured at the end of the performance period. The number of performance share units that vest will depend on adjusted EBITDA margin and adjusted diluted earnings per share from continuing operations at the following weights: 50% associated with achieving an adjusted EBITDA margin target and 50% associated with achieving an adjusted diluted earnings per share from continuing operations target. The number of performance share units that vest will be between 0% and 200% of the grant date amount of 0.5 million performance share units.

In November 2017, the Board of Directors approved a grant of performance share units to all executives eligible to participate in the long-term incentive plan. Each performance share unit represents the right to receive one share of common stock or its cash equivalent upon achievement of certain performance and time vesting criteria. The fair value of each performance share unit was $24.79, which was the company’s share price on the grant date of December 1, 2017. The Board of Directors also approved a grant of 0.3 million restricted share units to these executives. The restricted share units vest at the earlier of three years from the date of grant or upon termination of employment with the company under certain circumstances. The fair value of each restricted share unit was $24.79, which was the company's share price on the grant date of December 1, 2017.

earnings per share from continuing operations at the following weights: 50% associated with achieving an adjusted EBITDA margin target and 50% associated with achieving an adjusted diluted earnings per share from continuing operations target. The number of performance share units that vest will be between 0% and 200% of the grant date amount of 0.3 million performance share units.

In November 2016, the Board of Directors approved a grant of performance share units to all executives eligible to participate in the long-term incentive plan. Each performance share unit represents the right to receive one share of common stock or its cash equivalent upon achievement of certain performance and time vesting criteria. The fair value of each performance share unit was $12.77, which was the company’s share price on the grant date of December 1, 2016. The Board of Directors also approved a grant of 0.5 million restricted share units to these executives. The restricted share units vest at the earlier of three years from the date of grant or upon termination of employment with the company under certain circumstances. The fair value of each restricted share unit was $12.77, which was the company's share price on the grant date of December 1, 2016.

For the years ended September 30, 2019, 2018 and 2017, the dilutive impact of previously issued restricted shares, restricted share units, and performance share units was 2.2 million, 2.8 million and 1.7 million, respectively. For the years ended September 30, 2019, 2018 and 2017, compensation cost related to restricted shares, restricted share units, performance share units and stock options was $18 million, $20 million and $19 million, respectively.

Other significant accounting policies are included in the related notes, specifically, goodwill (Note 7), inventories (Note 11), property and depreciation (Note 13), capitalized software (Note 14), product warranties (Note 16), financial instruments (Note 19), equity based compensation (Note 21), retirement medical plans (Note 22), retirement pension plans (Note 23), income taxes (Note 24) and environmental and asbestos-related liabilities (Note 25).

In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers, followed by various related amendments (ASU 2016-08, ASU 2016-10, ASU 2016-11, ASU 2016-12, ASU 2016-20, ASU 2017-05, ASU 2017-06, ASU 2017-13, and ASU 2017-14) collectively referred to as "Topic 606", which requires companies to recognize revenue when a customer obtains control rather than when companies have transferred substantially all risks and rewards of a good or service and requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. The company adopted Topic 606 in the first quarter of the fiscal year beginning October 1, 2018. As a result, the company has changed its accounting policy for revenue recognition as detailed below.

The company applied Topic 606 using the modified retrospective approach (i.e., by recognizing the cumulative effect of initially applying Topic 606 as an adjustment to the opening balance of equity at October 1, 2018). Therefore, the comparative information for periods prior to our adoption date has not been adjusted and continues to be reported under Topic 605. There was no adjustment to the opening balance of equity at October 1, 2018 as there was no significant impact to previously recorded revenue or expense. The guidance has been applied to all existing contracts at the date of initial application. The adoption of Topic 606 had an immaterial impact on our Consolidated Balance Sheet, Consolidated Statement of Operations, and Consolidated Statement of Cash Flows but did require enhanced disclosures to meet the new disclosure requirements; those enhanced disclosures are included in Note 6.

In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The guidance requires entities to only include the service cost component of net periodic pension cost and net periodic postretirement benefit cost in operating expenses (together

with other employee compensation costs). The other components of net benefit cost, including amortization of prior service cost/credit, are to be included in a separate line item(s) outside of any sub-total of operating income. ASU 2017-07 also provides guidance that only the service cost component of net benefit cost is eligible for capitalization. The revisions in this amendment are to be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The company adopted this standard in the first quarter of fiscal year 2019. Amounts previously reflected in Operating Income were reclassified to Other income (expense) in accordance with the provisions of ASU 2017-07. For fiscal years 2018 and 2017, the non-service cost components of the net periodic pension and OPEB income were $25 million of income and $11 million of expense respectively, and are presented in other income. We used the practical expedient for retrospective presentation of the fiscal years 2018 and 2017 other expense components in this disclosure.

In July 2018, the FASB issued ASU 2018-09, Codification Improvements. The amendments in this ASU result from the FASB’s standing project to address suggestions on the Accounting Standards Codification ("ASC") and to make other incremental improvements to GAAP. The amendments include changes to clarify the ASC or correct unintended application of guidance that is not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities.

Some of the amendments in this ASU were effective upon issuance. Others have transition guidance with effective dates for annual periods beginning after December 15, 2018, for public business entities, or are conforming amendments that have been made to recently issued guidance that is not yet effective that may require application of the transition and effective date guidance in the original ASU.

The company adopted certain amendments in this ASU in the first quarter of fiscal year 2019. Those certain amendments had effective dates for annual periods beginning after December 15, 2017, for public business entities. The amendments that were adopted in the first quarter of fiscal year 2019 did not have a material impact on the company's Consolidated Financial Statements. The company plans to implement the remaining amendments beginning October 1, 2019 and is currently evaluating the potential impact on its Consolidated Financial Statements.



ASU		Effective Date
2016-01	Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	October 1, 2018
2016-15	Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force)	October 1, 2018
2016-16	Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory	October 1, 2018
2016-18	Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force)	October 1, 2018
2017-01	Business Combinations (Topic 805): Clarifying the Definition of a Business	October 1, 2018
2017-09	Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting	October 1, 2018
2018-03	Technical Corrections and Improvements to Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	October 1, 2018
2018-04	Investments—Debt Securities (Topic 320) and Regulated Operations (Topic 980): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273 (SEC Update)	October 1, 2018

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The update will require lessees to recognize a right-of-use asset and lease liability for substantially all leases. The standard is required to be adopted by public business entities in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The company plans to implement this standard in the first quarter of the fiscal year beginning October 1, 2019, and is currently assessing the potential impact of this guidance on its accounting policies and its Consolidated Financial Statements. The company plans to implement this standard using the additional and optional transition method as provided by ASU 2018-11. Please see discussion of ASU 2018-11 below.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments, including accounts receivable. The ASU also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The amendments in this update are required to be adopted by public business entities in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The company is currently evaluating the potential impact of this guidance on its accounting policies and its Consolidated Financial Statements.

In February 2018, the FASB issued ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220). The guidance in ASU 2018-02 allows an entity to elect to reclassify the stranded tax effects related to the Tax Cuts and Jobs Act of 2017 ("U.S. tax reform") from accumulated other comprehensive income into retained earnings. ASU 2018-02 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The company is currently evaluating the potential impact of this new guidance on its Consolidated Financial Statements.

In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842. The amendments in this ASU affect narrow aspects of the guidance issued in ASU 2016-02, Leases (Topic 842), which is not yet effective. The effective date and transition requirements for this ASU are the same as those for ASU 2016-02 as described above. Therefore, the company plans to implement this standard in the first quarter of the fiscal year beginning October 1, 2019 in connection with its planned implementation of ASU 2016-02 and is currently assessing the potential impact of this new guidance on its accounting policies and its Consolidated Financial Statements.

In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements. The amendments in this ASU affect the guidance issued in ASU 2016-02, Leases (Topic 842), which is not yet effective. The amendments provide entities with an additional (and optional) transition method to adopt the new leases standard. Under this new transition method, an entity initially applies the new leases standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The amendments also provide lessors with a practical expedient to not separate nonlease components from the associated lease component and, instead, to account for those components as a single component in certain circumstances. The effective date for this ASU are the same as those for ASU 2016-02 as described above. Therefore, the company plans to implement this standard in the first quarter of the fiscal year beginning October 1, 2019 in connection with its planned implementation of ASU 2016-02 and is currently assessing the potential impact of this new guidance on its accounting policies and its Consolidated Financial Statements. Based on the company's lease portfolio, the company currently anticipates recognizing a lease liability and related right-of-use asset on its balance sheet between $75 million and $95 million, with an immaterial impact on it's income statement compared to the current lease accounting model. Additionally, the company is implementing an enterprise-wide lease management system to assist in the accounting and evaluating additional changes to it's processes and internal controls to ensure the company meets the standard’s reporting and disclosure requirements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU add, modify, and eliminate certain disclosure requirements on fair value measurements in Topic 820. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Certain amendments should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. Others should be applied retrospectively. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this ASU and delay adoption of the additional disclosures until their effective date. The company is currently evaluating the potential impact of this new guidance on its Consolidated Financial Statements.

In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. The amendments in this ASU affect a variety of Topics in the Codification (ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities; ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments; and ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities).

For the amendments in this ASU that are applicable to ASU 2016-01, which the company has adopted and did not have a material impact on the Consolidated Financial Statements, the effective date is the first quarter of fiscal year 2021 with early adoption permitted. For the amendments in this ASU that are applicable to ASU 2016-13, which the company has not yet adopted, the effective date is the first quarter of fiscal year 2021. For the amendments in this ASU that are applicable to ASU 2017-12, which the company has adopted, the effective date is the first quarter of fiscal year 2020 with early adoption permitted. The company has not yet adopted any of these amendments and is currently evaluating the potential impact of this new guidance on its Consolidated Financial Statements.