CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 1,325.0	$ 1,112.5	$ 3,733.6	$ 2,754.7
Cost of sales	810.7	682.5	2,254.5	1,812.8
Gross Profit	514.3	430.0	1,479.1	941.9
Selling and administrative expenses	252.6	218.6	772.1	567.1
Amortization of intangible assets	80.3	97.0	244.8	240.1
Impairment of intangible assets	0.0	19.9	0.0	19.9
Other operating expense, net	17.5	25.5	36.9	170.1
Operating Income (Loss)	163.9	69.0	425.3	(55.3)
Interest expense	22.5	28.8	68.3	86.7
Loss on extinguishment of debt	9.0	0.0	9.0	2.0
Other income, net	(3.5)	(2.6)	(40.1)	(5.1)
Income (Loss) from Continuing Operations Before Income Taxes	135.9	42.8	388.1	(138.9)
Provision for income taxes	2.7	12.8	25.8	24.3
Loss on equity method investments	(2.2)	0.0	(2.9)	0.0
Income (Loss) from Continuing Operations	131.0	30.0	359.4	(163.2)
Loss from discontinued operations, net of tax	(4.2)	(0.1)	(88.1)	(20.3)
Net Income (Loss)	126.8	29.9	271.3	(183.5)
Less: Net income attributable to noncontrolling interests	0.8	0.4	1.8	1.4
Net Income (Loss) Attributable to Ingersoll Rand Inc.	126.0	29.5	269.5	(184.9)
Amounts attributable to Ingersoll Rand Inc. common stockholders:
Income (loss) from continuing operations, net of tax	130.2	29.6	357.6	(164.6)
Loss from discontinued operations, net of tax	(4.2)	(0.1)	(88.1)	(20.3)
Net income (loss) attributable to Ingersoll Rand Inc.	$ 126.0	$ 29.5	$ 269.5	$ (184.9)
Basic earnings (loss) per share of common stock:
Earnings (loss) from continuing operations (in usd per share)	$ 0.32	$ 0.07	$ 0.86	$ (0.44)
Loss from discontinued operations (in usd per share)	(0.01)	0	(0.21)	(0.05)
Net earnings (loss) (in usd per share)	0.31	0.07	0.65	(0.50)
Diluted earnings (loss) per share of common stock:
Earnings (loss) from continuing operations (in usd per share)	0.31	0.07	0.84	(0.44)
Loss from discontinued operations (in usd per share)	(0.01)	0	(0.21)	(0.05)
Net earnings (loss) (in usd per share)	$ 0.30	$ 0.07	$ 0.64	$ (0.50)