Long-Term Debt	6 Months Ended
Long-Term Debt	Jun. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Revolving Credit Facility On June 28, 2018, we entered into a Second Amended and Restated Credit Agreement (the “Amended Credit Agreement”) among EnPro Industries, Inc. and EnPro Holdings, Inc., a wholly owned subsidiary of the Company (“EnPro Holdings”), as borrowers, the guarantors party thereto, the lenders party thereto and Bank of America, N.A., as Administrative Agent, Swing Line Lender and Letter of Credit Issuer. The Amended Credit Agreement provides for a five-year, senior secured revolving credit facility of $350.0 million (the “Revolving Credit Facility”). The Amended Credit Agreement also provides that the borrowers may seek incremental term loans and/or additional revolving credit commitments in an amount equal to the greater of $225.0 million and 100% of consolidated EBITDA (as defined) for the most recently ended four-quarter period for which we have reported financial results, plus additional amounts based on a consolidated senior secured leverage ratio. Borrowing availability under the Revolving Credit Facility is not limited by reference to a borrowing base. Initially, borrowings under the Revolving Credit Facility bear interest at an annual rate of LIBOR plus 1.75% or base rate plus 0.75%, although the interest rates under the Revolving Credit Facility are subject to incremental increases based on a consolidated total net leverage ratio. In addition, a commitment fee accrues with respect to the unused amount of the Revolving Credit Facility. The Company and EnPro Holdings are the permitted borrowers under the Revolving Credit Facility. We have the ability to add foreign subsidiaries as borrowers under the Revolving Credit Facility for up to $100.0 million (or its foreign currency equivalent) in aggregate borrowings, subject to certain conditions. Each of our domestic, consolidated subsidiaries are required to guarantee the obligations of the borrowers under the Revolving Credit Facility, and each of our existing domestic, consolidated subsidiaries has entered into the Amended Credit Agreement to provide such a guarantee. Borrowings under the Revolving Credit Facility are secured by a first priority pledge of certain assets. The Amended Credit Agreement contains certain financial covenants and required financial ratios including a maximum consolidated total net leverage and a minimum consolidated interest coverage as defined in the Amended Credit Agreement. We were in compliance with all covenants of the Revolving Credit Facility as of June 30, 2019. The borrowing availability under our Revolving Credit Facility at June 30, 2019 was $250.4 million after giving consideration to $17.5 million of outstanding letters of credit and $82.1 million of outstanding revolver borrowings. Senior Notes In October 2018, we completed the offering of $350.0 million aggregate principal amount of 5.75% Senior Notes due 2026 (the "Senior Notes"). The Senior Notes are unsecured, unsubordinated obligations of EnPro and mature on October 15, 2026. Interest on the Senior Notes accrues at a rate of 5.75% per annum and is payable semi-annually in cash in arrears on April 15 and October 15 of each year, commencing on April 15, 2019. The Senior Notes are required to be guaranteed on a senior unsecured basis by each of EnPro's existing and future direct and indirect domestic subsidiaries that is a borrower under, or guarantees, our indebtedness under the Revolving Credit Facility or guarantees any other Capital Markets Indebtedness (as defined in the indenture governing the Senior Notes) of EnPro or any of the guarantors. On or after October 15, 2021, we may, on any one or more occasion, redeem all or part of the Senior Notes at specified redemption prices plus accrued and unpaid interest. In addition, we may redeem a portion of the aggregate principal amount of the Senior Notes before October 15, 2021 with the net cash proceeds from certain equity offerings at a specified redemption price plus accrued and unpaid interest, if any, to, but not including, the redemption price. We may also redeem some or all of the Senior Notes before October 15, 2021 at a redemption price of 100% of the principal amount, plus accrued and unpaid interest, if any, but not including, the redemption date, plus a "make whole" premium. Each holder of the Senior Notes may require us to repurchase some or all of the Senior Notes held by such holder for cash upon the occurrence of a defined "change of control" event. Our ability to redeem the Senior Notes prior to maturity is subject to certain conditions, including in certain cases the payment of make-whole amounts. The indenture governing the Senior Notes included covenants that restrict our ability to engage in certain activities, including incurring additional indebtedness, paying dividends, and repurchasing shares of our common stock, subject in each case to specified exceptions and qualifications set forth in the indenture.