CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 247.0	$ 317.2	$ 529.7	$ 620.2
Cost of sales	164.5	208.7	351.9	412.2
Gross profit	82.5	108.5	177.8	208.0
Operating expenses:
Selling, general and administrative	68.2	76.8	141.4	158.3
Other	12.5	1.0	14.1	2.4
Total operating expenses	80.7	77.8	155.5	160.7
Operating income	1.8	30.7	22.3	47.3
Interest expense	(3.9)	(4.5)	(8.6)	(9.7)
Interest income	0.4	0.3	1.1	1.0
Other income (expense)	0.3	(1.2)	1.7	(2.7)
Income (loss) from continuing operations before income taxes	(1.4)	25.3	16.5	35.9
Income tax expense	(1.8)	(8.7)	(9.5)	(11.5)
Income (loss) from continuing operations	(3.2)	16.6	7.0	24.4
Less: income attributable to redeemable non-controlling interest, net of tax	0.1	0.0	0.2	0.0
Income (loss) from continuing operations attributable to EnPro Industries, Inc.	(3.3)	16.6	6.8	24.4
Income (loss) from discontinued operations, net of tax	(3.2)	7.3	205.4	12.6
Net income (loss) attributable to EnPro Industries, Inc.	(6.5)	23.9	212.2	37.0
Comprehensive income	16.9	21.3	214.1	41.2
Less: comprehensive income attributable to redeemable non-controlling interest	0.7	0.0	1.7	0.0
Comprehensive income attributable to EnPro Industries, Inc.	$ 16.2	$ 21.3	$ 212.4	$ 41.2
Basic earnings (loss) per share attributable to EnPro Industries, Inc.:
Continuing operations (in dollars per share)	$ (0.16)	$ 0.81	$ 0.33	$ 1.18
Discontinued operations (in dollars per share)	(0.15)	0.35	9.99	0.61
Net income per share (in dollars per share)	(0.31)	1.16	10.32	1.79
Diluted earnings (loss) per share attributable to EnPro Industries, Inc.:
Continuing operations (in dollars per share)	(0.16)	0.80	0.33	1.17
Discontinued operations (in dollars per share)	(0.15)	0.35	9.98	0.61
Net income (loss) per share (in dollars per share)	$ (0.31)	$ 1.15	$ 10.31	$ 1.78