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Equity Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021
EnPro Industries, Inc.						47.32		%				1.40		%				0.22		%
S&P 600 Capital Goods Index						50.86		%				n/a						0.22		%
Shares granted February 18, 2020
EnPro Industries, Inc.						31.62		%				1.69		%				1.37		%
S&P 600 Capital Goods Index						34.90		%				n/a						1.37		%
Shares granted February 11, 2019
EnPro Industries, Inc.						30.72		%				1.4		%				2.53		%
S&P 600 Capital Goods Index						34.36		%				n/a						2.53		%

The following table provides certain information with respect to stock options as of December 31, 2021:

Range of Exercise Price			Share Options Outstanding						Stock Options Exercisable						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life
Under $80.00			68,549						23,163						$	53.78					8.16
Over $80.00 and under $90.00			76,222						—						80.66						9.18
Over $90.00			10,265						—						106.10						9.91
Total			155,036						23,163						$	70.46					8.78

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

A summary of award activity under these plans is as follows:

			Restricted Share Units												Performance Shares - Equity												Performance Shares - Liability
			Shares						Weighted- Average Grant Date Fair Value						Shares						Weighted- Average Grant Date Fair  Value						Shares						Fair Value at December 31, 2020
Nonvested at December 31, 2018			218,930						$	57.87					199,655						$	75.87					—						$	—
Granted			78,576						68.48						116,342						77.15						—						—
Vested			(78,958)						44.44						(75,312)						49.68						—						—
Forfeited			(6,830)						72.99						(12,130)						82.26						—						—
Achievement level adjustment			—						—						24,105						49.68						—						—
Shares settled for cash			(12,294)						43.85						—						—						—						—
Nonvested at December 31, 2019			199,424						72.72						252,660						81.46						—						—
Granted			97,144						59.27						—						—						95,924						105.91
Vested			(53,163)						68.42						—						—						—						—
Forfeited			(34,890)						71.14						(33,218)						81.91						(2,336)						105.91
Achievement level adjustment			—						—						(132,846)						93.61						—						—
Shares settled for cash			(8,136)						68.35						—						—						—						—
Nonvested at December 31, 2020			200,379						67.83						86,596						77.15						93,588						105.91
Granted			134,895						75.97						—						—						160,206						174.16
Vested			(30,665)						82.14						(49,586)						77.15						—						—
Forfeited			(104,573)						70.59						(6,978)						77.15						(69,272)						177.86
Achievement level adjustment			—						—						(30,032)						77.15						—						—
Shares settled for cash			(16,878)						82.50						—												—						—
Nonvested at December 31, 2021			183,158						$	70.07					—						$	—					184,522						$	177.86

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

The following assumptions were used to estimate the 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			6.0 years						6.0 years						6.0 years						6.0 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		%

The following assumptions were used to estimate the fair value of the 2020 option awards:

			Grant Date
			February 27, 2020						August 27, 2020
Average expected term			6 years						6 years
Expected volatility			31.53		%				39.51		%
Risk-free interest rate			1.17		%				0.42		%
Expected dividend yield			1.93		%				1.74		%

Share-based Payment Arrangement, Option, Activity

A summary of option activity under the Plans as of December 31, 2021, and changes during the year then ended, is presented below:

			Share Options Outstanding						Weighted Average Exercise Price
Balance at December 31, 2020			202,804						$	58.91
Granted			162,327						81.96
Exercised			(38,451)						48.32
Forfeited			(171,644)						68.82
Balances at December 31, 2021			155,036						$	70.46

Schedule Of Intrinsic Value Related to stock Options

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

			As of and for the Years Ended December 31,
(in millions)			2021						2020						2019
Options outstanding			$	6.1					$	4.0					$	0.5
Options exercisable			$	1.3					$	0.6					$	0.4

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)			2021						2020						2019
Compensation expense			$	5.0					$	5.4					$	6.8
Related income tax benefit			$	1.4					$	1.4					$	2.2

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