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Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator (basic and diluted):        
Income from continuing operations $ 8.2 $ 26.8 $ 11.4 $ 65.0
Less: net income (loss) attributable to redeemable non-controlling interests (0.1) 0.6 (4.3) 0.8
Income from continuing operations attributable to EnPro Industries, Inc. 8.3 26.2 15.7 64.2
Income from discontinued operations, net of tax 0.0 0.7 11.4 13.9
Net income attributable to EnPro Industries, Inc. 8.3 26.9 27.1 78.1
Net income attributable to EnPro Industries, Inc. $ 8.3 $ 26.9 $ 27.1 $ 78.1
Denominator:        
Weighted-average shares – basic (in shares) 20.9 20.8 20.9 20.8
Share-based awards (in shares) 0.1 0.1 0.1 0.1
Weighted-average shares – diluted (in shares) 21.0 20.9 21.0 20.9
Basic earnings per share attributable to EnPro Industries, Inc.:        
Continuing operations (in dollars per share) $ 0.40 $ 1.26 $ 0.75 $ 3.09
Discontinued operations (in dollars per share) 0 0.03 0.55 0.67
Net income per share (in dollars per share) 0.40 1.29 1.30 3.76
Diluted earnings per share attributable to EnPro Industries, Inc.:        
Continuing operations (in dollars per share) 0.39 1.26 0.75 3.08
Discontinued operations (in dollars per share) 0 0.03 0.54 0.66
Net income per share (in dollars per share) $ 0.39 $ 1.29 $ 1.29 $ 3.74