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Equity Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Information With Respect to Stock Options

We used the following assumptions in determining the fair value of these awards:

						Expected stock price volatility						Annual expected dividend yield						Risk free interest rate
Shares granted February 16, 2023
Enpro Inc.						36.78		%				—		%				4.34		%
S&P 600 Capital Goods Index						44.65		%				n/a						4.34		%
Shares granted February 15, 2022
Enpro Inc.						33.1		%				1.00		%				4.26		%
S&P 600 Capital Goods Index						39.43		%				n/a						4.26		%
Shares granted February 16, 2021
EnPro Industries, Inc.						47.32		%				1.4		%				0.22		%
S&P 600 Capital Goods Index						50.86		%				n/a						0.22		%

The following table provides certain information with respect to stock options as of December 31, 2023:

Range of Exercise Price			Stock Options Outstanding						Stock Options Exercisable						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life
Under $80.00			42,091						42,091						$	53.78					6.16
Over $80.00 and under $95.00			63,231						39,280						$	80.57					7.18
Over $95.00 and under $110.00			64,234						24,932						$	106.47					8.11
Over $110.00			51,871						—						$	111.29					9.21
Total			221,427						106,303						$	90.19					7.73

Schedule of Restricted Share Units Activity, Performance Share Activity and Restricted Stock Activity

A summary of award activity under the Plans is as follows:

			Restricted Share Units												Performance Shares - Equity
			Shares						Weighted- Average Grant Date Fair Value						Shares						Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2022			124,597						88.52						—						—
Granted			62,209						116.89						60,998						148.97
Vested			(42,450)						79.61						—						—
Forfeited			(12,947)						96.14						(878)						148.97
Shares settled for cash			(17,850)						87.90						—						—
Nonvested at December 31, 2023			113,559						$	107.07					60,120						$	148.97

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Valuation Assumptions

The following assumptions were used to estimate the indicated fair value of the 2023 option awards:

			Grant Date
			February 16, 2023						March 2, 2023						October 30, 2023
Fair-value at grant date (per share)			$	47.27					$	45.13					$	48.88
Assumptions:
Average expected term			6 years						6 years						6 years
Expected volatility			39.59		%				39.75		%				40.38		%
Risk-free interest rate			4.02		%				4.22		%				4.84		%
Expected dividend yield			0.99		%				1.05		%				1.01		%

The following assumptions were used to estimate the indicated fair value of the 2022 option awards:

			Grant Date
			February 15, 2022						February 24, 2022
Fair-value at grant date (per share)			$	38.86					$	39.07
Assumptions:
Average expected term			6 years						6 years
Expected volatility			39.85		%				39.88		%
Risk-free interest rate			1.99		%				1.89		%
Expected dividend yield			1.06		%				1.05		%

The following assumptions were used to estimate the indicated fair value of the 2021 option awards:

			Grant Date
			February 25, 2021						May 4, 2021						May 17, 2021						August 5, 2021						November 26, 2021
Fair-value at grant date (per share)			$	27.46					$	30.32					$	33.53					$	29.78					$	36.53
Assumptions:
Average expected term			6 years						6 years						6 years						6 years						5.6 years
Expected volatility			40.29		%				40.37		%				40.46		%				40.65		%				39.51		%
Risk-free interest rate			1.02		%				1.05		%				1.07		%				0.87		%				0.42		%
Expected dividend yield			1.35		%				1.24		%				1.14		%				1.26		%				1.74		%

Schedule of Share-based Payment Arrangement, Option, Activity

A summary of option activity under the Plans as of December 31, 2023, and changes during the year then ended, is presented below:

			Stock Options Outstanding						Weighted Average Exercise Price
Balance at December 31, 2022			184,930						$	82.32
Granted			51,871						111.29
Exercised			(14,975)						65.73
Forfeited			(399)						106.54
Balance at December 31, 2023			221,427						$	90.19

Schedule Of Intrinsic Value Related to stock Options

The year-end intrinsic value related to stock options is presented below:

			December 31,
(in millions)			2023						2022						2021
Options outstanding			$	14.7					$	4.9					$	6.1
Options exercisable			$	8.6					$	2.4					$	1.3

Schedule of Equity Based Compensation

We recognized the following equity-based employee compensation expenses and benefits related to our Plan activity:

			Years Ended December 31,
(in millions)			2023						2022						2021
Compensation expense			$	8.8					$	6.0					$	5.0
Related income tax benefit			$	2.4					$	1.6					$	1.4

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