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Investments in Affiliated Companies (Significant Investments in Affiliates) (Details 1)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Joint_Venture
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investments in and Advances to Affiliates [Line Items]        
Advances to Affiliate   $ 9.7 $ 11.2  
Asset Impairment Charges   38.5 33.9 $ 1.3
Equity Method Investment, Net Sales Proceeds   1.0 24.7 19.4
Portfolio proceeds and other   223.7 482.2 264.0
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Investments in affiliated companies   387.0 348.5 357.7
Fair Value of Assets Acquired       1.1
Cardinal Marine [Domain]        
Investments in and Advances to Affiliates [Line Items]        
Asset Impairment Charges $ 19.0   19.0  
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
GATX's Percentage Ownership 50.00%      
Rolls Royce Partners Finance [Member]        
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Investments in affiliated companies [1]   $ 375.3    
GATX's Percentage Ownership [1]   50.00%    
Adler Funding Llc [Member]        
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Investments in affiliated companies   $ 10.2    
GATX's Percentage Ownership   13.00%    
Other Affiliates [Member]        
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Investments in affiliated companies   $ 1.5    
RRPF Joint Ventures [Member]        
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Number of joint venture investments | Joint_Venture   15    
Intermodal Investment Fund V and VII [Member]        
Investments in and Advances to Affiliates [Line Items]        
Equity Method Investment, Net Sales Proceeds     18.3  
Portfolio Management [Member]        
Investments in and Advances to Affiliates [Line Items]        
Asset Impairment Charges   $ 6.7 31.0 (0.1)
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Investments in affiliated companies   375.3 335.1 $ 338.7
Portfolio Management [Member] | Cardinal Marine [Domain]        
Investments in and Advances to Affiliates [Line Items]        
Asset Impairment Charges     19.0  
Portfolio Management [Member] | Cardinal Marine [Domain]        
Investments in and Advances to Affiliates [Line Items]        
Portfolio proceeds and other   $ 1.0 $ 24.7  
[1] (1) Combined investment balances of fifteen separate joint ventures (collectively, the "RRPF affiliates")