Document and Entity Information
Document and Entity Information - USD ($) $ in Billions | 12 Months Ended | |
Dec. 31, 2021 | Jan. 31, 2022 | |
Entity Addresses [Line Items] | ||
Document Type | 10-K/A | |
Document Annual Report | true | |
Document Period End Date | Dec. 31, 2021 | |
Document Transition Report | false | |
Entity File Number | 1-2328 | |
Entity Registrant Name | GATX Corporation | |
Entity Incorporation, State or Country Code | NY | |
Entity Tax Identification Number | 36-1124040 | |
Entity Address, Address Line One | 233 South Wacker Drive | |
Entity Address, City or Town | Chicago | |
Entity Address, State or Province | IL | |
Entity Address, Postal Zip Code | 60606 | |
City Area Code | (312) | |
Local Phone Number | 621-6200 | |
Entity Central Index Key | 0000040211 | |
Entity Interactive Data Current | Yes | |
Amendment Flag | true | |
Document Fiscal Year Focus | 2021 | |
Document Fiscal Period Focus | FY | |
Current Fiscal Year End Date | --12-31 | |
Entity Well-known Seasoned Issuer | Yes | |
Entity Voluntary Filers | No | |
Entity Current Reporting Status | Yes | |
Entity Filer Category | Large Accelerated Filer | |
Entity Small Business | false | |
Entity Emerging Growth Company | false | |
Entity Common Stock, Shares Outstanding | 35,400,000 | |
Entity Shell Company | false | |
Documents Incorporated by Reference | GATX’s definitive Proxy Statement filed on March 11, 2022 | |
ICFR Auditor Attestation Flag | true | |
Entity Public Float | $ 3.1 | |
Amendment Description | Explanatory NoteOn February 17, 2022, GATX Corporation (the "Company") filed with the Securities and Exchange Commission its Annual Report on Form 10-K for the year ended December 31, 2021. This amendment No. 1 to Form 10-K ("Amendment No. 1") of the Company is being filed solely to amend Item 15(c) to include the separate financial statements of Alpha Partners Leasing Limited ("APLL") as required under Rule 3-09 of Regulation S-X. The financial statements of APLL for its fiscal year ended December 31, 2021 were not available at the time the Company filed its Annual Report on Form 10-K. The required financial statements are now provided as Exhibit 99.1 to this Amendment No. 1.Item 15 is the only portion of the Company's Annual Report on Form 10-K being supplemented or amended by this Amendment No. 1. This Amendment No. 1 does not change any other information set forth in the original filing of the Company's Annual Report on Form 10-K for the year ended December 31, 2021. This Amendment No. 1 consists solely of the preceding cover page, this explanatory note, the information required by Item 15(c) of Form 10-K as provided in Exhibit 99.1, a signature page, the consent of the independent auditors for APLL, and certifications required to be filed as exhibits hereto. | |
Auditor Name | Ernst & Young LLP | |
Auditor Location | Chicago, IL | |
Auditor Firm ID | 42 | |
NEW YORK STOCK EXCHANGE, INC. [Member] | Common Stock [Member] | ||
Entity Addresses [Line Items] | ||
Security Exchange Name | NYSE | |
Title of 12(b) Security | Common Stock | |
Trading Symbol | GATX | |
CHICAGO STOCK EXCHANGE, INC [Member] | Common Stock [Member] | ||
Entity Addresses [Line Items] | ||
Security Exchange Name | CHX | |
Title of 12(b) Security | Common Stock | |
Trading Symbol | GATX |