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
	Mar. 31, 2022	Mar. 31, 2021
Numerator (basic and diluted):
Net income	$ 16.5	$ 18.1
Less: net income attributable to redeemable non-controlling interests	0.3	0.1
Net income attributable to EnPro Industries, Inc.	$ 16.2	$ 18.0
Denominator:
Weighted-average shares – basic (in shares)	20.8	20.6
Share-based awards (in shares)	0.1	0.1
Weighted-average shares – diluted (in shares)	20.9	20.7
Basic earnings per share attributable to EnPro Industries, Inc. (in dollars per share)	$ 0.78	$ 0.87
Diluted earnings per share attributable to EnPro Industries, Inc. (in dollars per share)	$ 0.77	$ 0.87