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Description of Business	6 Months Ended
Description of Business	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business As used herein, "GATX," "we," "us," "our," and similar terms refer to GATX Corporation and its subsidiaries, unless indicated otherwise. We lease, operate, manage, and remarket long-lived, widely used assets, primarily in the rail market. We report our financial results through three primary business segments: Rail North America, Rail International, and Portfolio Management. Financial results for our tank container leasing business ("Trifleet Leasing") are reported in the Other segment. In the first quarter of 2023, we sold our rail business in Russia ("Rail Russia") within the Rail International segment. The net assets of Rail Russia had been reported as held for sale since the third quarter of 2022. See "Note 6. Asset Impairments and Assets Held for Sale" for further information. In the second quarter of 2023, we sold one of our liquefied gas-carrying vessels (the "Specialized Gas Vessels") within the Portfolio Management segment. We had previously sold one vessel in the first quarter of 2023 and two vessels in the third quarter of 2022. The one remaining vessel is classified as held for sale as of June 30, 2023. In the second quarter of 2023, GATX Engine Leasing ("GEL") acquired nine aircraft spare engines for approximately $239 million.