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Debt (Details 1) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Debt Disclosure [Abstract]    
Weighted-average interest rate 4.59% 4.08%
Weighted-average term, in years $ 8.6 $ 8.4
Maturities of GATX's debt obligations    
2025 632,400,000  
2026 602,300,000  
2027 836,100,000  
2028 730,700,000  
2029 674,400,000  
Thereafter 4,795,000,000  
Total debt principal 8,270,900,000 7,450,600,000
Balance $ 10,400,000 $ 11,000,000.0