Stock-Based Compensation	6 Months Ended
Jun. 30, 2026
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	15. Stock-Based Compensation In connection with the Transactions, outstanding liability and equity awards under Legacy Enviri's long-term incentive plan ("LTIP") became fully vested during the six months ended June 30, 2026. Accordingly, the Company recognized $9.3 million of compensation expense related to the acceleration of such incentive compensation awards during the three and six months ended June 30, 2026, which was recorded within Operating income (loss) from continuing operations. In addition, the Company recognized $4.7 million of stock-based compensation expense within Income (loss) from discontinued operations related to awards held by former employees of CE. Following the closing of the Transactions, no future awards may be granted under Legacy Enviri's equity compensation plans, which have been terminated. During the six months ended June 30, 2026, the Company settled certain in-the-money stock appreciation rights ("SARs") in connection with the Transactions, which included a cash payment of $16.5 million and the issuance of 709,542 replacement SARs in the Company. In addition, the Company issued 136,321 replacement SARs in the Company for certain SARs that were not in-the-money at the time of the Transactions. The Company recognized $0.1 million of incremental expense related to the issuance of the replacement SARs. The replacement SARS have a weighted-average exercise price of $8.89 and there is no future service requirement. Also during the six months ended June 30, 2026, the Company settled deferred compensation in shares to the Company's Board of Directors for $2.6 million and in cash-based performance stock units ("PSUs") to employees for $12.5 million that were previously liability-classified. On June 15, 2026, the Company granted new equity awards that consisted of restricted stock units ("RSUs") and PSUs under the Company's 2026 Omnibus Incentive Plan. This included 480,698 RSUs granted to the Company's employees with a weighted-average grant fair value of $20.71 per share and vest over a three-year period or upon a specified retirement or years of service criteria. PSUs of 290,871 were granted to the Company's employees with a weighted-average fair value of $28.68 per share and vest over a three-year performance period based on the Company's stock price performance. In addition, 43,750 RSUs were granted to Directors with a weighted-average grant fair value of $20.71 per share and vest over a one-year period.

In connection with the Transactions, outstanding liability and equity awards under Legacy Enviri's long-term incentive plan ("LTIP") became fully vested during the six months ended June 30, 2026. Accordingly, the Company recognized $9.3 million of compensation expense related to the acceleration of such incentive compensation awards during the three and six months ended June 30, 2026, which was recorded within Operating income (loss) from continuing operations. In addition, the Company recognized $4.7 million of stock-based compensation expense within Income (loss) from discontinued operations related to awards held by former employees of CE. Following the closing of the Transactions, no future awards may be granted under Legacy Enviri's equity compensation plans, which have been terminated.

During the six months ended June 30, 2026, the Company settled certain in-the-money stock appreciation rights ("SARs") in connection with the Transactions, which included a cash payment of $16.5 million and the issuance of 709,542 replacement SARs in the Company. In addition, the Company issued 136,321 replacement SARs in the Company for certain SARs that were not in-the-money at the time of the Transactions. The Company recognized $0.1 million of incremental expense related to the issuance of the replacement SARs. The replacement SARS have a weighted-average exercise price of $8.89 and there is no future service requirement. Also during the six months ended June 30, 2026, the Company settled deferred compensation in shares to the Company's Board of Directors for $2.6 million and in cash-based performance stock units ("PSUs") to employees for $12.5 million that were previously liability-classified.

On June 15, 2026, the Company granted new equity awards that consisted of restricted stock units ("RSUs") and PSUs under the Company's 2026 Omnibus Incentive Plan. This included 480,698 RSUs granted to the Company's employees with a weighted-average grant fair value of $20.71 per share and vest over a three-year period or upon a specified retirement or years of service criteria. PSUs of 290,871 were granted to the Company's employees with a weighted-average fair value of $28.68 per share and vest over a three-year performance period based on the Company's stock price performance. In addition, 43,750 RSUs were granted to Directors with a weighted-average grant fair value of $20.71 per share and vest over a one-year period.