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Debt - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]      
Gain (Loss) on Extinguishment of Debt $ 5.0 $ 0.0  
Corporate      
Debt Instrument [Line Items]      
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs 529.8   $ 524.8
Corporate | Senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount 0.2   0.2
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs $ 399.8   399.8
Corporate | Senior notes | 4.55% Senior Notes Due October 2024 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.55%    
Corporate | Revolving Credit Facility [Member] | Line of credit      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 200.0    
Proceeds from Lines of Credit 180.0    
Repayments of Lines of Credit 175.0    
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs 130.0   125.0
Line of Credit Facility, Remaining Borrowing Capacity $ 284.5    
Debt Instrument, Interest Rate, Effective Percentage 1.50%    
Line of Credit Facility, Current Borrowing Capacity $ 450.0    
Line of Credit Facility, Interest Rate at Period End 0.20%    
Corporate | Letter of credit | Line of credit      
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount $ 35.5    
TILC [Member] | Railcar Leasing and Management Services Group | Revolving Credit Facility [Member] | Line of credit | TILC warehouse facility      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 3.04%    
Borrowings on Warehouse Loan Facility $ 168.6    
Repayments on Warehouse Loan Facility 34.0    
Long-term Line of Credit 488.0   353.4
Debt Instrument, Face Amount 750.0    
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | 2018 Secured Railcar Equipment Notes [Domain]      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount 0.2   0.2
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | TRIHC 2018 Secured Railcar Equipment Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount 1.1   1.4
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | 2019 Secured Railcar Equipment Notes [Domain] [Domain]      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount $ 0.4   $ 0.4
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | 2006 Secured Railcar Equipment Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 5.90%    
Extinguishment of Debt, Amount $ 104.7    
Gain (Loss) on Extinguishment of Debt 5.0    
Redemption Premium 4.7    
Amortization of Debt Issuance Costs 0.3    
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Revolving Credit Facility [Member] | Line of credit | TILC warehouse facility      
Debt Instrument [Line Items]      
TILC warehouse loan, unused portion $ 262.0    
Minimum | Corporate | Revolving Credit Facility [Member] | Line of credit      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate at Period End 0.175%    
Maximum | Corporate | Revolving Credit Facility [Member] | Line of credit      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate at Period End 0.30%