CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss) attributable to Ingersoll Rand Inc.	$ 29.5	$ 41.3	$ (184.9)	$ 133.4
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments, net	142.6	(48.8)	95.3	(55.3)
Unrecognized gain on cash flow hedges, net	4.2	3.3	10.9	4.7
Pension and other postretirement prior service cost and gain or (loss), net	(1.0)	1.9	2.4	3.3
Total other comprehensive income (loss), net of tax	145.8	(43.6)	108.6	(47.3)
Comprehensive income (loss) Attributable to Ingersoll Rand Inc.	175.3	(2.3)	(76.3)	86.1
Comprehensive Income (Loss) Attributable to Noncontrolling Interests
Net income attributable to noncontrolling interests	0.4	0.0	1.4	0.0
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments, net	3.8	0.0	(1.6)	0.0
Total other comprehensive income (loss), net of tax	3.8	0.0	(1.6)	0.0
Comprehensive income (loss) attributable to noncontrolling interests	4.2	0.0	(0.2)	0.0
Total Comprehensive Income (Loss)	$ 179.5	$ (2.3)	$ (76.5)	$ 86.1