Significant Accounting Policies	9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Note 2. Significant Accounting Policies Basis of presentation The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the nine months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. For further information, refer to the financial statements and footnotes included in our Form 10-K for the year ended December 31, 2016 as filed with the Securities and Exchange Commission on February 23, 2017. Use of estimates The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Recently issued accounting standards In March 2017, the FASB issued ASU 2017-07, "Compensation-Retirement Benefits", which requires the service cost component of net benefit costs to be reported with other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs are required to be presented separately from the service cost component and outside of income from operations. This amendment also allows only the service cost component to be eligible for capitalization when applicable. The guidance is effective for interim and annual periods beginning after December 15, 2017. While the presentation of the costs within the Statements of Operations will change, we do not expect a material impact on our financial statements or related disclosures. In March 2017, the FASB issued ASU 2017-08, "Receivables-Nonrefundable Fees and Other Costs", which shortens the amortization period for certain purchased callable debt securities held at a premium from maturity date to the earliest call date. ASU 2017-08 is effective for interim and annual reporting periods beginning after December 31, 2018. The guidance should be applied using a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Early adoption is permitted, including adoption in an interim period. We do not expect the adoption of this guidance to have a material impact on our financial statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments-Credit Losses", which requires financial assets measured at amortized cost to be presented at the net amount expected to be collected through the use of a new forward-looking expected loss model and credit losses relating to available-for-sale debt securities to be recognized through an allowance for credit losses. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Early adoption for interim and annual periods beginning after December 15, 2018 is permitted. We have evaluated the impact of this guidance on our invested assets. Our investments are not measured at amortized cost, which are the investments that require the use of a new expected loss model. Our available-for-sale debt securities will continue to be monitored for credit losses which would be reflected as an allowance for credit losses rather than a reduction of the carrying value of the asset. The other material financial assets subject to this guidance include our receivables from Erie Insurance Exchange and affiliates. Given the financial strength of the Exchange, demonstrated by its strong surplus position and industry ratings, it is unlikely these receivables would have significant, if any, credit loss exposure. We do not expect a material impact on our financial statements or related disclosures as a result of this guidance. In February 2016, the FASB issued ASU 2016-02, "Leases", which requires lessees to recognize assets and liabilities arising from operating leases on the statement of financial position and to disclose key information about leasing arrangements. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Leases are required to be recognized and measured at the beginning of the earliest period presented using a modified retrospective approach. Early adoption is permitted. We expect to adopt ASU 2016-02 as of January 1, 2019 using the modified retrospective method. Under existing guidance, we recognize lease expense as a component of operating expenses in the Statements of Operations. We are in the process of evaluating our existing lease contracts to determine the impact to our financial statements and disclosures. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments-Overall". ASU 2016-01 revises the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. ASU 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. As of September 30, 2017, we do not own any equity security investments, therefore the adoption of this guidance would have no impact to our financial statements. We will continue to monitor our investment portfolio as we may enter into investments in equity securities; however, at this time we do not expect that recognizing the change in fair value of future equity investments through net income instead of accumulated other comprehensive income would be material. In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers". ASU 2014-09 requires an entity to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period with early application permitted beginning in the first interim period in 2017. We expect to adopt the ASU 2014-09 as of January 1, 2018 under the modified retrospective method where the cumulative effect is recognized at the date of initial application. Our evaluation is ongoing and not complete. We performed an analysis in accordance with the steps identified in the new guidance around the recognition, measurement, and presentation of management fee revenue. We determined that service fee revenue is not within the scope of the new guidance. We have preliminarily concluded that adoption of this guidance will not have a material impact on our management fee revenue recognition pattern or our financial statements. We are also reviewing agreements related to the amounts we receive as reimbursements from the Exchange and its subsidiaries, such as claims-related expenses, investment and other overhead expenses. While the expenses are reimbursed to us at actual cost, we are evaluating if there is a performance obligation that would require allocation of revenue under this guidance. Additionally, we are evaluating the impact of the new disclosure requirements.

Note 2. Significant Accounting Policies

Basis of presentation

The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the nine months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. For further information, refer to the financial statements and footnotes included in our Form 10-K for the year ended December 31, 2016 as filed with the Securities and Exchange Commission on February 23, 2017.

Use of estimates

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Recently issued accounting standards

In March 2017, the FASB issued ASU 2017-07, "Compensation-Retirement Benefits", which requires the service cost component of net benefit costs to be reported with other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs are required to be presented separately from the service cost component and outside of income from operations. This amendment also allows only the service cost component to be eligible for capitalization when applicable. The guidance is effective for interim and annual periods beginning after December 15, 2017. While the presentation of the costs within the Statements of Operations will change, we do not expect a material impact on our financial statements or related disclosures.

In March 2017, the FASB issued ASU 2017-08, "Receivables-Nonrefundable Fees and Other Costs", which shortens the amortization period for certain purchased callable debt securities held at a premium from maturity date to the earliest call date. ASU 2017-08 is effective for interim and annual reporting periods beginning after December 31, 2018. The guidance should be applied using a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Early adoption is permitted, including adoption in an interim period. We do not expect the adoption of this guidance to have a material impact on our financial statements.

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments-Credit Losses", which requires financial assets measured at amortized cost to be presented at the net amount expected to be collected through the use of a new forward-looking expected loss model and credit losses relating to available-for-sale debt securities to be recognized through an allowance for credit losses. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Early adoption for interim and annual periods beginning after December 15, 2018 is permitted. We have evaluated the impact of this guidance on our invested assets. Our investments are not measured at amortized cost, which are the investments that require the use of a new expected loss model. Our available-for-sale debt securities will continue to be monitored for credit losses which would be reflected as an allowance for credit losses rather than a reduction of the carrying value of the asset. The other material financial assets subject to this guidance include our receivables from Erie Insurance Exchange and affiliates. Given the financial strength of the Exchange, demonstrated by its strong surplus position and industry ratings, it is unlikely these receivables would have significant, if any, credit loss exposure. We do not expect a material impact on our financial statements or related disclosures as a result of this guidance.

In February 2016, the FASB issued ASU 2016-02, "Leases", which requires lessees to recognize assets and liabilities arising from operating leases on the statement of financial position and to disclose key information about leasing arrangements. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Leases are required to be recognized and measured at the beginning of the earliest period presented using a modified retrospective approach. Early adoption is permitted. We expect to adopt ASU 2016-02 as of January 1, 2019 using the modified retrospective method. Under existing guidance, we recognize lease expense as a component of operating expenses in the Statements of Operations. We are in the process of evaluating our existing lease contracts to determine the impact to our financial statements and disclosures.

In January 2016, the FASB issued ASU 2016-01, "Financial Instruments-Overall". ASU 2016-01 revises the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. ASU 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. As of September 30, 2017, we do not own any equity security investments, therefore the adoption of this guidance would have no impact to our financial statements. We will continue to monitor our investment portfolio as we may enter into investments in equity securities; however, at this time we do not expect that recognizing the change in fair value of future equity investments through net income instead of accumulated other comprehensive income would be material.

In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers". ASU 2014-09 requires an entity to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period with early application permitted beginning in the first interim period in 2017. We expect to adopt the ASU 2014-09 as of January 1, 2018 under the modified retrospective method where the cumulative effect is recognized at the date of initial application. Our evaluation is ongoing and not complete. We performed an analysis in accordance with the steps identified in the new guidance around the recognition, measurement, and presentation of management fee revenue. We determined that service fee revenue is not within the scope of the new guidance. We have preliminarily concluded that adoption of this guidance will not have a material impact on our management fee revenue recognition pattern or our financial statements. We are also reviewing agreements related to the amounts we receive as reimbursements from the Exchange and its subsidiaries, such as claims-related expenses, investment and other overhead expenses. While the expenses are reimbursed to us at actual cost, we are evaluating if there is a performance obligation that would require allocation of revenue under this guidance. Additionally, we are evaluating the impact of the new disclosure requirements.