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Description of Business	3 Months Ended
Description of Business	Mar. 31, 2022
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 2021, GATX invested directly in aircraft spare engines through its new entity, GATX Engine Leasing ("GEL"). GEL acquired 14 aircraft spare engines for approximately $352 million, including 4 engines for $120 million from the Rolls-Royce & Partners Finance joint ventures (collectively the “RRPF affiliates” or "RRPF"). Financial results for this business are reported in the Portfolio Management segment.