SCHEDULE I - BALANCE SHEETS (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets [Abstract]
Cash and cash equivalents	$ 2,109.6	$ 1,750.9
Other current assets	186.9	195.3
Total current assets	4,114.9	3,862.1
Deferred tax assets	28.0	15.6
Total identifiable assets	15,154.5	16,058.6
Liabilities and Equity
Total liabilities	6,083.3	6,869.1
Stockholders’ equity:
Common stock, $0.01 par value; 1,000,000,000 shares authorized; 423,785,571 and 420,123,978 shares issued as of December 31, 2021 and 2020, respectively	4.3	4.2
Capital in excess of par value	9,408.6	9,310.3
Accumulated deficit	378.6	(175.7)
Accumulated other comprehensive loss	(41.6)	14.2
Treasury stock at cost; 16,000,364 and 1,496,169 shares as of December 31, 2021 and 2020, respectively	(748.4)	(33.3)
Total Ingersoll Rand Inc. stockholders’ equity	9,001.5	9,119.7
Total liabilities and equity	$ 15,154.5	$ 16,058.6
Balance Sheet Related Disclosures [Abstract]
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock authorized (shares)	1,000,000,000	1,000,000,000
Common stock issued (shares)	423,785,571	420,123,978
Treasury stock (shares)	16,000,364	1,496,169
Parent Company
Current assets [Abstract]
Cash and cash equivalents	$ 0.0	$ 0.0
Other current assets	0.0	0.4
Total current assets	0.0	0.4
Equity in net assets of subsidiaries	8,513.3	8,006.0
Intercompany receivables	484.1	1,107.3
Deferred tax assets	10.8	10.9
Total identifiable assets	9,008.2	9,124.6
Liabilities and Equity
Other liabilities	6.7	4.9
Total liabilities	6.7	4.9
Stockholders’ equity:
Common stock, $0.01 par value; 1,000,000,000 shares authorized; 423,785,571 and 420,123,978 shares issued as of December 31, 2021 and 2020, respectively	4.3	4.2
Capital in excess of par value	9,408.6	9,310.3
Accumulated deficit	378.6	(175.7)
Accumulated other comprehensive loss	(41.6)	14.2
Treasury stock at cost; 16,000,364 and 1,496,169 shares as of December 31, 2021 and 2020, respectively	(748.4)	(33.3)
Total Ingersoll Rand Inc. stockholders’ equity	9,001.5	9,119.7
Total liabilities and equity	$ 9,008.2	$ 9,124.6