CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues	$ 4,910.2	$ 2,451.9	$ 2,689.8
Cost of sales	3,296.8	1,540.2	1,677.3
Gross Profit	1,613.4	911.7	1,012.5
Selling and administrative expenses	894.8	436.4	434.6
Amortization of intangible assets	395.8	124.3	125.8
Impairment of other intangible assets	19.9	0.0	0.0
Other operating expense, net	217.2	75.7	9.1
Operating Income	85.7	275.3	443.0
Interest expense	111.1	88.9	99.6
Loss on extinguishment of debt	2.0	0.2	1.1
Other income, net	(8.0)	(4.7)	(7.2)
Income (Loss) Before Income Taxes	(19.4)	190.9	349.5
Provision for income taxes	13.0	31.8	80.1
Net Income (Loss)	(32.4)	159.1	269.4
Less: Net income attributable to noncontrolling interests	0.9	0.0	0.0
Net Income (Loss) Attributable to Ingersoll Rand Inc.	$ (33.3)	$ 159.1	$ 269.4
Basic income (loss) per share (USD per share)	$ (0.09)	$ 0.78	$ 1.34
Diluted income (loss) per share (USD per share)	$ (0.09)	$ 0.76	$ 1.29