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Earnings (Loss) 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, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator (basic and diluted):      
Income (loss) from continuing operations attributable to EnPro Industries, Inc. $ 177.2 $ (23.7) $ 7.8
Income from discontinued operations 0.0 208.1 30.5
Net income attributable to EnPro Industries, Inc $ 177.2 $ 184.4 $ 38.3
Denominator:      
Weighted-average shares – basic (in shares) 20.6 20.5 20.7
Share-based awards (in shares) 0.2 0.0 0.1
Weighted-average shares – diluted (in shares) 20.8 20.5 20.8
Basic earnings (loss) per share:      
Continuing operations (in dollars per share) $ 8.60 $ (1.15) $ 0.38
Discontinued operations (in dollars per share) 0 10.13 1.48
Net income (in dollars per share) 8.60 8.98 1.86
Diluted earnings (loss) per share attributable to EnPro Industries, Inc.:      
Continuing operations (in dollars per share) 8.53 (1.15) 0.38
Discontinued operations (in dollars per share) 0 10.13 1.47
Net income per share (in dollars per share) $ 8.53 $ 8.98 $ 1.85
Antidilutive securities excluded (in shares)   0.1