Long-Term Debt	6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Senior Notes In September 2014, we completed an offering of $300 million aggregate principal amount of our 5.875% Senior Notes due 2022 (the “Senior Notes”). We issued the notes net of an original issue discount of $2.4 million. The Senior Notes are unsecured, unsubordinated obligations of EnPro and mature on September 15, 2022. Interest on the Senior Notes accrues at a rate of 5.875% per annum and is payable semi-annually in cash in arrears on March 15 and September 15 of each year. The debt discount is being amortized through interest expense until the maturity date resulting in an effective interest rate of 6.00%. 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 September 15, 2017, we may, on any one or more occasions, redeem all or a 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 September 15, 2017 with the net cash proceeds from certain equity offerings at a specified redemption price plus accrued and unpaid interest, if any. We may also redeem some or all of the Senior Notes before September 15, 2017 at a redemption price of 100% of the principal amount, plus accrued and unpaid interest, if any, plus a “make whole” premium. Each holder of the Senior Notes may require us to repurchase some or all of the Senior Notes 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 includes covenants that restrict our ability to engage in certain activities, including incurring additional indebtedness and paying dividends, subject in each case to specified exceptions and qualifications set forth in the indenture. In March 2017, we completed an add-on offering of $150.0 million of our 5.875% Senior Notes due 2022 (the “Additional Notes"). We issued the notes inclusive of an original issue premium of $1.5 million. The offer was made in the United States to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”), and to non-U.S. persons in offshore transactions in reliance on Regulation S under the Securities Act. The indenture for the Additional Notes contains the same interest payment, redemption, change of control, covenant, and guarantee provisions as for the Senior Notes. The debt premium is being amortized through interest expense until the maturity date resulting in an effective interest rate of 5.66%. The proceeds from the offering of the Additional Notes were used primarily to repay outstanding borrowings under the Revolving Credit Facility (described below) in order to increase availability to fund future capital requirements, including those funding requirements associated with the joint plan of reorganization of OldCo and GST, which are described in Note 17, "Commitments and Contingencies — Asbestos — Plans of Reorganization." Revolving Credit Facility We have a $300 million senior secured revolving credit facility (the “Revolving Credit Facility”). Borrowings under the Revolving Credit Facility bear interest at an annual rate of LIBOR plus 2.00% or base rate plus 1.00%, although the interest rates under the Revolving Credit Facility are subject to incremental increases or decreases based on a consolidated total leverage ratio. In addition, a commitment fee accrues with respect to the unused amount of the Revolving Credit Facility. The Revolving Credit Facility expires in August 2019. Borrowings under the Revolving Credit Facility are secured by a first priority pledge of certain of our assets. The Revolving Credit Facility contains financial covenants and required financial ratios, including a maximum consolidated total net leverage and a minimum consolidated interest coverage as defined in the agreement. It also contains affirmative and negative covenants which are subject to customary exceptions and qualifications. We were in compliance with all such covenants as of June 30, 2017. The borrowing availability under our Revolving Credit Facility at June 30, 2017 was $237.9 million after giving consideration to $14.1 million of outstanding letters of credit and $48.0 million of outstanding revolver borrowings. In October 2016, the Revolving Credit Facility was amended to permit various transactions as part of the contemplated corporate restructuring of Coltec, which is discussed further in Note 17, "Commitments and Contingencies — Asbestos — Plans of Reorganization." Permitted borrowers under the Revolving Credit Facility now include our newly formed subsidiary, EnPro Holdings, in addition to EnPro. Each of our domestic consolidated subsidiaries (other than GST, OldCo and their respective subsidiaries, until they became consolidated subsidiaries) is required to guarantee the obligations of the borrowers under the Revolving Credit Facility, and each of our existing domestic, consolidated subsidiaries has provided such a guarantee.

Long-Term Debt

Senior Notes

In September 2014, we completed an offering of $300 million aggregate principal amount of our 5.875% Senior Notes due 2022 (the “Senior Notes”). We issued the notes net of an original issue discount of $2.4 million.

The Senior Notes are unsecured, unsubordinated obligations of EnPro and mature on September 15, 2022. Interest on the Senior Notes accrues at a rate of 5.875% per annum and is payable semi-annually in cash in arrears on March 15 and September 15 of each year. The debt discount is being amortized through interest expense until the maturity date resulting in an effective interest rate of 6.00%. 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 September 15, 2017, we may, on any one or more occasions, redeem all or a 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 September 15, 2017 with the net cash proceeds from certain equity offerings at a specified redemption price plus accrued and unpaid interest, if any. We may also redeem some or all of the Senior Notes before September 15, 2017 at a redemption price of 100% of the principal amount, plus accrued and unpaid interest, if any, plus a “make whole” premium.

Each holder of the Senior Notes may require us to repurchase some or all of the Senior Notes 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 includes covenants that restrict our ability to engage in certain activities, including incurring additional indebtedness and paying dividends, subject in each case to specified exceptions and qualifications set forth in the indenture.

In March 2017, we completed an add-on offering of $150.0 million of our 5.875% Senior Notes due 2022 (the “Additional Notes"). We issued the notes inclusive of an original issue premium of $1.5 million. The offer was made in the United States to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”), and to non-U.S. persons in offshore transactions in reliance on Regulation S under the Securities Act.

The indenture for the Additional Notes contains the same interest payment, redemption, change of control, covenant, and guarantee provisions as for the Senior Notes. The debt premium is being amortized through interest expense until the maturity date resulting in an effective interest rate of 5.66%.

The proceeds from the offering of the Additional Notes were used primarily to repay outstanding borrowings under the Revolving Credit Facility (described below) in order to increase availability to fund future capital requirements, including those funding requirements associated with the joint plan of reorganization of OldCo and GST, which are described in Note 17, "Commitments and Contingencies — Asbestos — Plans of Reorganization."

Revolving Credit Facility

We have a $300 million senior secured revolving credit facility (the “Revolving Credit Facility”). Borrowings under the Revolving Credit Facility bear interest at an annual rate of LIBOR plus 2.00% or base rate plus 1.00%, although the interest rates under the Revolving Credit Facility are subject to incremental increases or decreases based on a consolidated total leverage ratio. In addition, a commitment fee accrues with respect to the unused amount of the Revolving Credit Facility. The Revolving Credit Facility expires in August 2019.

Borrowings under the Revolving Credit Facility are secured by a first priority pledge of certain of our assets. The Revolving Credit Facility contains financial covenants and required financial ratios, including a maximum consolidated total net leverage and a minimum consolidated interest coverage as defined in the agreement. It also contains affirmative and negative covenants which are subject to customary exceptions and qualifications. We were in compliance with all such covenants as of June 30, 2017.

The borrowing availability under our Revolving Credit Facility at June 30, 2017 was $237.9 million after giving consideration to $14.1 million of outstanding letters of credit and $48.0 million of outstanding revolver borrowings.

In October 2016, the Revolving Credit Facility was amended to permit various transactions as part of the contemplated corporate restructuring of Coltec, which is discussed further in Note 17, "Commitments and Contingencies — Asbestos — Plans of Reorganization." Permitted borrowers under the Revolving Credit Facility now include our newly formed subsidiary, EnPro Holdings, in addition to EnPro. Each of our domestic consolidated subsidiaries (other than GST, OldCo and their respective subsidiaries, until they became consolidated subsidiaries) is required to guarantee the obligations of the borrowers under the Revolving Credit Facility, and each of our existing domestic, consolidated subsidiaries has provided such a guarantee.