CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 268.3	$ 299.0	$ 798.0	$ 919.2
Cost of sales	173.8	201.3	525.7	613.5
Gross profit	94.5	97.7	272.3	305.7
Operating expenses:
Selling, general and administrative	73.2	77.1	214.6	235.4
Other	28.8	1.5	42.9	3.9
Total operating expenses	102.0	78.6	257.5	239.3
Operating income (loss)	(7.5)	19.1	14.8	66.4
Interest expense	(4.0)	(4.1)	(12.6)	(13.8)
Interest income	0.1	0.3	1.2	1.3
Other expense	(17.2)	(24.6)	(15.5)	(27.3)
Income (loss) from continuing operations before income taxes	(28.6)	(9.3)	(12.1)	26.6
Income tax benefit (expense)	7.3	0.9	(2.2)	(10.6)
Income (loss) from continuing operations	(21.3)	(8.4)	(14.3)	16.0
Less: income attributable to redeemable non-controlling interest, net of tax	0.3	0.0	0.5	0.0
Income (loss) from continuing operations attributable to EnPro Industries, Inc.	(21.6)	(8.4)	(14.8)	16.0
Income from discontinued operations, net of tax	1.9	6.9	207.3	19.5
Net income (loss) attributable to EnPro Industries, Inc.	(19.7)	(1.5)	192.5	35.5
Comprehensive income (loss)	(13.1)	3.7	200.8	44.9
Less: comprehensive income attributable to redeemable non-controlling interest	0.5	0.0	2.0	0.0
Comprehensive income (loss) attributable to EnPro Industries, Inc.	$ (13.6)	$ 3.7	$ 198.8	$ 44.9
Basic earnings (loss) per share attributable to EnPro Industries, Inc.:
Continuing operations (in dollars per share)	$ (1.05)	$ (0.41)	$ (0.72)	$ 0.77
Discontinued operations (in dollars per share)	0.09	0.33	10.09	0.94
Net income per share (in dollars per share)	(0.96)	(0.08)	9.37	1.71
Diluted earnings (loss) per share attributable to EnPro Industries, Inc.:
Continuing operations (in dollars per share)	(1.05)	(0.41)	(0.72)	0.77
Discontinued operations (in dollars per share)	0.09	0.33	10.09	0.94
Net income (loss) per share (in dollars per share)	$ (0.96)	$ (0.08)	$ 9.37	$ 1.71