CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Total Ingersoll Rand Inc. Stockholders' Equity	Total Ingersoll Rand Inc. Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interests
Balance at beginning of period (in shares) at Dec. 31, 2019					206.8
Balance at beginning of period at Dec. 31, 2019	$ 1,869.9	$ (1.0)	$ 1,869.9	$ (1.0)	$ 2.1	$ 2,302.0	$ (141.4)	$ (1.0)	$ (256.0)	$ (36.8)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(213.4)		(214.4)				(214.4)				1.0
Acquisition of Ingersoll Rand Industrial (in shares)					211.0
Acquisition of Ingersoll Rand Industrial	7,009.3		6,937.0		$ 2.1	6,934.9					72.3
Costs of issuing equity securities	(1.0)		(1.0)			(1.0)
Issuance of common stock for stock-based compensation plans (in shares)					0.8
Issuance of common stock for stock-based compensation plans	5.9		5.9			5.9
Purchases of treasury stock	(1.3)		(1.3)							(1.3)
Issuance of treasury stock for stock-based compensation plans	0.8		0.8			(1.5)				2.3
Stock-based compensation	16.2		16.2			16.2
Other comprehensive income (loss), net of tax	(41.6)		(37.2)						(37.2)		(4.4)
Adjustments for shares tendered in open offer	2.0										2.0
Balance at end of period (in shares) at Jun. 30, 2020					418.6
Balance at end of period at Jun. 30, 2020	8,641.8		8,574.9		$ 4.2	9,256.5	(356.8)		(293.2)	(35.8)	66.9
Balance at beginning of period (in shares) at Mar. 31, 2020					418.2
Balance at beginning of period at Mar. 31, 2020	8,755.5		8,686.2		$ 4.2	9,241.5	(179.2)		(344.1)	(36.2)	69.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(176.5)		(177.6)				(177.6)				1.1
Issuance of common stock for stock-based compensation plans (in shares)					0.4
Issuance of common stock for stock-based compensation plans	3.7		3.7			3.7
Purchases of treasury stock	(0.5)		(0.5)							(0.5)
Issuance of treasury stock for stock-based compensation plans	0.4		0.4			(0.5)				0.9
Stock-based compensation	11.8		11.8			11.8
Other comprehensive income (loss), net of tax	49.4		50.9						50.9		(1.5)
Adjustments for shares tendered in open offer	2.0										2.0
Balance at end of period (in shares) at Jun. 30, 2020					418.6
Balance at end of period at Jun. 30, 2020	8,641.8		8,574.9		$ 4.2	9,256.5	(356.8)		(293.2)	(35.8)	66.9
Balance at beginning of period (in shares) at Dec. 31, 2020					420.1
Balance at beginning of period at Dec. 31, 2020	9,189.5		9,119.7		$ 4.2	9,310.3	(175.7)		14.2	(33.3)	69.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	144.5		143.5				143.5				1.0
Issuance of common stock for stock-based compensation plans (in shares)					1.4
Issuance of common stock for stock-based compensation plans	12.3		12.3			12.3
Purchases of treasury stock	(3.2)		(3.2)							(3.2)
Issuance of treasury stock for stock-based compensation plans	0.8		0.8			(1.1)				1.9
Stock-based compensation	54.5		54.5			54.5
Other comprehensive income (loss), net of tax	(50.5)		(48.2)						(48.2)		(2.3)
Divestiture of foreign subsidiaries	(1.5)		(1.5)						(1.5)
Balance at end of period (in shares) at Jun. 30, 2021					421.5
Balance at end of period at Jun. 30, 2021	9,346.4		9,277.9		$ 4.2	9,376.0	(32.2)		(35.5)	(34.6)	68.5
Balance at beginning of period (in shares) at Mar. 31, 2021					420.9
Balance at beginning of period at Mar. 31, 2021	9,025.7		8,956.7		$ 4.2	9,337.8	(266.1)		(84.4)	(34.8)	69.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	234.6		233.9				233.9				0.7
Issuance of common stock for stock-based compensation plans (in shares)					0.6
Issuance of common stock for stock-based compensation plans	7.6		7.6			7.6
Purchases of treasury stock	(0.2)		(0.2)							(0.2)
Issuance of treasury stock for stock-based compensation plans	0.4		0.4							0.4
Stock-based compensation	30.6		30.6			30.6
Other comprehensive income (loss), net of tax	49.2		50.4						50.4		(1.2)
Divestiture of foreign subsidiaries	(1.5)		(1.5)						(1.5)
Balance at end of period (in shares) at Jun. 30, 2021					421.5
Balance at end of period at Jun. 30, 2021	$ 9,346.4		$ 9,277.9		$ 4.2	$ 9,376.0	$ (32.2)		$ (35.5)	$ (34.6)	$ 68.5