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Fair Value Disclosure (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Impact of GATX's Derivative Instrument on Income Statement and Other comprehensive income (loss)      
Other comprehensive loss (effective portion) $ 12.9 $ (39.6) $ 7.3
Interest Expense [Member] | Fair Value Hedging [Member]      
Impact of GATX's Derivative Instrument on Income Statement and Other comprehensive income (loss)      
Interest expense [1] 3.0 5.3 0.8
Interest Expense [Member] | Cash Flow Hedges [Member]      
Impact of GATX's Derivative Instrument on Income Statement and Other comprehensive income (loss)      
Effective portion reclassified from accumulated other comprehensive loss 4.2 6.8 6.9
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member]      
Impact of GATX's Derivative Instrument on Income Statement and Other comprehensive income (loss)      
Other comprehensive loss (effective portion) 12.6 (41.5) 4.9
Operating Expense [Member] | Cash Flow Hedges [Member]      
Impact of GATX's Derivative Instrument on Income Statement and Other comprehensive income (loss)      
Effective portion reclassified from accumulated other comprehensive loss 0.1 0.1 1.1
Other Nonoperating Income (Expense) [Member] | Cash Flow Hedges [Member]      
Impact of GATX's Derivative Instrument on Income Statement and Other comprehensive income (loss)      
Effective portion reclassified from accumulated other comprehensive loss (11.7) 38.9 (11.9)
Other Expense [Member] | Non-designated [Member]      
Impact of GATX's Derivative Instrument on Income Statement and Other comprehensive income (loss)      
Other expense $ (2.2) $ 8.0 $ (2.6)
[1] (1) The fair value adjustments related to the underlying debt equally offset the amounts recognized in interest expense.