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Debt - Narrative (Details)
9 Months Ended
Oct. 17, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 02, 2018
USD ($)
Jun. 01, 2018
USD ($)
May 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Non-recourse debt   $ 2,882,100,000       $ 2,401,200,000
Non-recourse debt   2,851,500,000       2,375,600,000
Redemption of convertible subordinated notes   152,900,000        
Convertible subordinated notes            
Debt Instrument [Line Items]            
Debt Conversion, Converted Instrument, Settled in Par   800,000        
Debt Conversion, Converted Instrument, Amount   646,600,000        
Convertible Debt     $ 449,300,000   $ 448,500,000  
Corporate | Convertible subordinated notes | 3 7/8% Convertible Subordinated Notes Due 2036            
Debt Instrument [Line Items]            
Capital in excess of par value related to the Convertible Subordinated Notes' conversion options   $ 92,500,000        
Effective annual interest rate yield   8.42%        
Corporate | Revolving credit facility | Line of credit            
Debt Instrument [Line Items]            
Revolving credit facility   $ 600,000,000        
Remaining borrowing capacity on revolving credit facility   521,200,000        
Borrowing under revolving credit facility exclusive of letters of credit   0        
Corporate | Letter of credit | Line of credit            
Debt Instrument [Line Items]            
Used revolving credit facility for letters of credit   78,800,000        
Railcar Leasing and Management Services Group            
Debt Instrument [Line Items]            
Non-recourse debt   2,851,500,000       2,375,600,000
Wholly-owned subsidiaries            
Debt Instrument [Line Items]            
Non-recourse debt   1,531,000,000 [1]       1,024,800,000
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group            
Debt Instrument [Line Items]            
Non-recourse debt   1,548,300,000       1,035,900,000
Non-recourse debt   1,531,000,000       1,024,800,000
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Promissory note | 2017 promissory notes            
Debt Instrument [Line Items]            
Non-recourse debt   282,300,000       293,600,000
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Revolving credit facility | Line of credit | TILC warehouse facility            
Debt Instrument [Line Items]            
TILC warehouse loan, unused portion   521,300,000        
Non-recourse debt   228,700,000       150,700,000
TILC | Railcar Leasing and Management Services Group | Revolving credit facility | Line of credit | TILC warehouse facility            
Debt Instrument [Line Items]            
Revolving credit facility   $ 750,000,000       1,000,000,000
Effective annual interest rate yield   3.83%        
TILC warehouse loan, amount outstanding   $ 228,700,000        
Partially-owned subsidiaries            
Debt Instrument [Line Items]            
Non-recourse debt   1,320,500,000 [1]       1,350,800,000
Partially-owned subsidiaries | Railcar Leasing and Management Services Group            
Debt Instrument [Line Items]            
Non-recourse debt   1,333,600,000       1,365,300,000
Non-recourse debt   1,320,500,000       1,350,800,000
Partially-owned subsidiaries | Railcar Leasing and Management Services Group | Secured debt | TRIP Master Funding secured railcar equipment notes            
Debt Instrument [Line Items]            
Non-recourse debt   946,900,000       $ 962,500,000
Trinity Rail Leasing 2018 | Secured debt | 2018 secured railcar equipment notes            
Debt Instrument [Line Items]            
Debt instrument, issued amount       $ 482,500,000    
Trinity Rail Leasing 2018 | Secured debt | 2018 Secured Railcar Equipment Class A-1 Note            
Debt Instrument [Line Items]            
Debt instrument, issued amount   195,000,000   $ 200,000,000    
Debt instrument, stated interest rate       3.82%    
Trinity Rail Leasing 2018 | Secured debt | 2018 Secured Railcar Equipment Class A-2 Note            
Debt Instrument [Line Items]            
Debt instrument, issued amount   282,500,000   $ 282,500,000    
Debt instrument, stated interest rate       4.62%    
Additional Paid-in Capital [Member]            
Debt Instrument [Line Items]            
Redemption of convertible subordinated notes   $ 152,900,000        
Acquired railcar leasing entity            
Debt Instrument [Line Items]            
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable $ 75,400,000          
Railcars acquired in subsequent event 4,150          
Debt acquired in acquisition $ 283,900,000          
[1] (unaudited)