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Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator (basic and diluted):      
Income from continuing operations attributable to Enpro Inc. $ 10.8 $ 6.7 $ 56.9
Income from discontinued operations 11.4 198.4 121.0
Net income 22.2 205.1 177.9
Net income $ 22.2 $ 205.1 $ 177.9
Denominator:      
Weighted-average shares – basic (in shares) 20.9 20.8 20.6
Share-based awards (in shares) 0.1 0.1 0.2
Weighted-average shares – diluted (in shares) 21.0 20.9 20.8
Basic earnings per share:      
Continuing operations (in dollars per share) $ 0.52 $ 0.32 $ 2.76
Discontinued operations (in dollars per share) 0.54 9.54 5.88
Net income per share (in dollars per share) 1.06 9.86 8.64
Diluted earnings per share:      
Continuing operations (in dollars per share) 0.51 0.32 2.74
Discontinued operations (in dollars per share) 0.54 9.51 5.83
Net income per share (in dollars per share) $ 1.05 $ 9.83 $ 8.57