Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income
Beginning balance		$ 1,266.6			$ 1,266.6
Other comprehensive income (loss) before reclassifications	$ (16.1)		$ 12.2		(29.0)	$ 3.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.1		0.2		0.2	0.3
Net current-period other comprehensive income (loss)	(16.0)		12.4		(28.8)	4.1
Less: other comprehensive income (loss) attributable to redeemable non-controlling interests	(1.1)		0.6		(2.2)	0.2
Net current-period other comprehensive income (loss) attributable to EnPro Industries, Inc.	(14.9)		11.8		(26.6)	3.9
Ending balance	1,275.0				1,275.0
Total
Accumulated Other Comprehensive Income
Beginning balance	2.9	14.6	(12.8)	$ (4.9)	14.6	(4.9)
Net current-period other comprehensive income (loss)	(14.9)	(11.7)	11.8	(7.9)
Ending balance	(12.0)	2.9	(1.0)	(12.8)	(12.0)	(1.0)
Unrealized Translation Adjustments
Accumulated Other Comprehensive Income
Beginning balance	34.9	46.7	23.7	31.7	46.7	31.7
Other comprehensive income (loss) before reclassifications	(16.1)		12.2		(29.0)	3.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.0		0.0		0.0	0.0
Net current-period other comprehensive income (loss)	(16.1)		12.2		(29.0)	3.8
Less: other comprehensive income (loss) attributable to redeemable non-controlling interests	(1.1)		0.6		(2.2)	0.2
Net current-period other comprehensive income (loss) attributable to EnPro Industries, Inc.	(15.0)		11.6		(26.8)	3.6
Ending balance	19.9	34.9	35.3	23.7	19.9	35.3
Pension and Other Postretirement Plans
Accumulated Other Comprehensive Income
Beginning balance	(32.0)	(32.1)	(36.5)	(36.6)	(32.1)	(36.6)
Other comprehensive income (loss) before reclassifications	0.0		0.0		0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.1		0.2		0.2	0.3
Net current-period other comprehensive income (loss)	0.1		0.2		0.2	0.3
Less: other comprehensive income (loss) attributable to redeemable non-controlling interests	0.0		0.0		0.0	0.0
Net current-period other comprehensive income (loss) attributable to EnPro Industries, Inc.	0.1		0.2		0.2	0.3
Ending balance	$ (31.9)	$ (32.0)	$ (36.3)	$ (36.5)	$ (31.9)	$ (36.3)