XML 24 R8.htm IDEA: XBRL DOCUMENT

Description of Business	9 Months Ended
Description of Business	Sep. 30, 2024
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 Engine Leasing (previously named Portfolio Management). Financial results for our tank container leasing business ("Trifleet") are reported in the Other segment. In the first quarter of 2024, we changed the name of our Portfolio Management business segment to Engine Leasing to reflect the prospective operations of this business segment. Historically, this business segment included marine operations from our liquefied gas-carrying vessels (the "Specialized Gas Vessels"). As of December 31, 2023, we had sold all of our marine assets and no longer have any marine operations. The segment is now almost entirely composed of our engine leasing operations, which include our ownership interest in the RRPF affiliates, a group of joint ventures with Rolls-Royce plc (or affiliates thereof, collectively "Rolls-Royce") that lease aircraft spare engines, and GATX Engine Leasing ("GEL"), our business that directly owns aircraft spare engines that are leased to airline customers or employed in an engine capacity agreement.