Long-Term Debt	6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Convertible Debentures In October 2005, we issued $172.5 million in aggregate principal amount of Convertible Debentures, net of an original issue discount of $61.3 million. The Convertible Debentures that remain outstanding bear interest at the annual rate of 3.9375%, with interest due on April 15 and October 15 of each year, and will mature on October 15, 2015, unless they are converted prior to that date. The Convertible Debentures are direct, unsecured and unsubordinated obligations and rank equal in priority with all unsecured and unsubordinated indebtedness and senior in right of payment to all subordinated indebtedness. They do not contain any financial covenants. Holders may convert the Convertible Debentures into cash and shares of our common stock, under certain circumstances. As of July 1, 2014, the Convertible Debentures remained convertible by holders of the Convertible Debentures. This conversion right was triggered because the closing price per share of EnPro’s common stock exceeded $43.93, or 130% of the conversion price of $33.79, for at least twenty (20) trading days during the thirty (30) consecutive trading day period ending on June 30, 2014. The Convertible Debentures will be convertible until September 30, 2014, and may be convertible thereafter if one or more of the conversion conditions is satisfied during future measurement periods. Because the Convertible Debentures are currently convertible, the outstanding principal balance less the remaining unamortized debt discount was reflected in current maturities of long-term debt as of June 30, 2014. In addition, we classified the excess cash required to redeem the Convertible Debentures over their carrying value as temporary equity. In March 2014, we entered into privately negotiated transactions with certain holders of approximately $56.1 million in aggregate principal amount of the Convertible Debentures to exchange them for an aggregate of approximately 1.7 million shares of EnPro's common stock, plus cash payments of accrued and unpaid interest and for fractional shares. We recognized a $3.6 million pre-tax loss on the exchange ($2.3 million net of tax) which is included in other (non-operating) expense in the accompanying Consolidated Statements of Operations. There was also a $0.8 million additional tax benefit recorded directly to equity. In June 2014, we entered into an additional privately negotiated transaction with certain holders of approximately $41.6 million in aggregate principal amount of the Convertible Debentures to exchange them for an aggregate of approximately 1.3 million shares of EnPro’s common stock, plus cash payments of accrued and unpaid interest and for fractional shares. We recognized a $2.4 million pre-tax loss on the exchange ($1.5 million net of tax) which is included in other (non-operating) expense in the accompanying Consolidated Statements of Operations. In addition, there was a $0.6 million tax benefit recorded directly to equity. The exchange transactions reduced the aggregate principal amount of the Convertible Debentures outstanding to approximately $74.8 million. The exchange transactions did not reduce the respective obligations under the hedge and warrant transactions entered into in connection with the original sale of the Convertible Debentures, which remain in force with respect to the original amount of the Convertible Debentures. The debt discount, $5.1 million as of June 30, 2014, is being amortized through interest expense until the maturity date of October 15, 2015, resulting in an effective interest rate of approximately 9.5%. Interest expense related to the Convertible Debentures for the quarters ended June 30, 2014 and 2013 includes $1.2 million and $1.7 million, respectively, of contractual interest coupon and $1.4 million and $1.9 million, respectively, of debt discount amortization. Interest expense related to the Convertible Debentures for the six months ended June 30, 2014 and 2013 includes $2.8 million and $3.4 million, respectively, of contractual interest coupon and $3.2 million and $3.7 million, respectively, of debt discount amortization. Credit Facility Our primary U.S. operating subsidiaries, other than GST LLC, have a senior secured revolving credit facility with a maximum availability of $175 million. Actual borrowing availability under the credit facility is determined by reference to a borrowing base of specified percentages of eligible accounts receivable, inventory, equipment and real property elected to be pledged, and is reduced by usage of the facility, including outstanding letters of credit and any reserves. Under certain conditions, we may request an increase to the facility maximum availability to $225 million in total. Any increase is dependent on obtaining future lender commitments for those amounts, and no current lender has any obligation to provide such commitment. The credit facility matures on July 17, 2015 unless, prior to that date, the Convertible Debentures are paid in full, refinanced on certain terms or defeased, in which case the facility will mature on March 30, 2016. The borrowing availability under our senior secured revolving credit facility at June 30, 2014 was $79.8 million after giving consideration to $5.7 million of letters of credit outstanding and $48.7 million of outstanding revolver borrowings.

Long-Term Debt

Convertible Debentures

In October 2005, we issued $172.5 million in aggregate principal amount of Convertible Debentures, net of an original issue discount of $61.3 million. The Convertible Debentures that remain outstanding bear interest at the annual rate of 3.9375%, with interest due on April 15 and October 15 of each year, and will mature on October 15, 2015, unless they are converted prior to that date. The Convertible Debentures are direct, unsecured and unsubordinated obligations and rank equal in priority with all unsecured and unsubordinated indebtedness and senior in right of payment to all subordinated indebtedness. They do not contain any financial covenants.

Holders may convert the Convertible Debentures into cash and shares of our common stock, under certain circumstances. As of July 1, 2014, the Convertible Debentures remained convertible by holders of the Convertible Debentures. This conversion right was triggered because the closing price per share of EnPro’s common stock exceeded $43.93, or 130% of the conversion price of $33.79, for at least twenty (20) trading days during the thirty (30) consecutive trading day period ending on June 30, 2014. The Convertible Debentures will be convertible until September 30, 2014, and may be convertible thereafter if one or more of the conversion conditions is satisfied during future measurement periods. Because the Convertible Debentures are currently convertible, the outstanding principal balance less the remaining unamortized debt discount was reflected in current maturities of long-term debt as of June 30, 2014. In addition, we classified the excess cash required to redeem the Convertible Debentures over their carrying value as temporary equity.

In March 2014, we entered into privately negotiated transactions with certain holders of approximately $56.1 million in aggregate principal amount of the Convertible Debentures to exchange them for an aggregate of approximately 1.7 million shares of EnPro's common stock, plus cash payments of accrued and unpaid interest and for fractional shares. We recognized a $3.6 million pre-tax loss on the exchange ($2.3 million net of tax) which is included in other (non-operating) expense in the accompanying Consolidated Statements of Operations. There was also a $0.8 million additional tax benefit recorded directly to equity.

In June 2014, we entered into an additional privately negotiated transaction with certain holders of approximately $41.6 million in aggregate principal amount of the Convertible Debentures to exchange them for an aggregate of approximately 1.3 million shares of EnPro’s common stock, plus cash payments of accrued and unpaid interest and for fractional shares. We recognized a $2.4 million pre-tax loss on the exchange ($1.5 million net of tax) which is included in other (non-operating) expense in the accompanying Consolidated Statements of Operations. In addition, there was a $0.6 million tax benefit recorded directly to equity.

The exchange transactions reduced the aggregate principal amount of the Convertible Debentures outstanding to approximately $74.8 million. The exchange transactions did not reduce the respective obligations under the hedge and warrant transactions entered into in connection with the original sale of the Convertible Debentures, which remain in force with respect to the original amount of the Convertible Debentures.

The debt discount, $5.1 million as of June 30, 2014, is being amortized through interest expense until the maturity date of October 15, 2015, resulting in an effective interest rate of approximately 9.5%. Interest expense related to the Convertible Debentures for the quarters ended June 30, 2014 and 2013 includes $1.2 million and $1.7 million, respectively, of contractual interest coupon and $1.4 million and $1.9 million, respectively, of debt discount amortization. Interest expense related to the Convertible Debentures for the six months ended June 30, 2014 and 2013 includes $2.8 million and $3.4 million, respectively, of contractual interest coupon and $3.2 million and $3.7 million, respectively, of debt discount amortization.

Credit Facility

Our primary U.S. operating subsidiaries, other than GST LLC, have a senior secured revolving credit facility with a maximum availability of $175 million. Actual borrowing availability under the credit facility is determined by reference to a borrowing base of specified percentages of eligible accounts receivable, inventory, equipment and real property elected to be pledged, and is reduced by usage of the facility, including outstanding letters of credit and any reserves. Under certain conditions, we may request an increase to the facility maximum availability to $225 million in total. Any increase is dependent on obtaining future lender commitments for those amounts, and no current lender has any obligation to provide such commitment. The credit facility matures on July 17, 2015 unless, prior to that date, the Convertible Debentures are paid in full, refinanced on certain terms or defeased, in which case the facility will mature on March 30, 2016.

The borrowing availability under our senior secured revolving credit facility at June 30, 2014 was $79.8 million after giving consideration to $5.7 million of letters of credit outstanding and $48.7 million of outstanding revolver borrowings.