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Derivative Instruments and Fair Value Accounting Derivative Effect on Interest (Details) - Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 0.0   $ 0.0  
Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 0.0   0.0  
Interest Rate Cap [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 0.0   0.0  
Interest Rate Swap, 2017 Promissory Notes - Expired [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (0.6)   (0.6)  
Interest Rate Swap, TRL-2023 Term Loan - Expired [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 1.2   1.2  
Forward Interest Rate Swap, TILC - Expired [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 1.3   1.3  
Interest Rate Swap, TRL-2023 Term Loan - Open        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net [1] 1.6   1.6  
Interest Expense [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0.0 $ 0.0 0.1 $ 0.1
Interest Expense [Member] | Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0.0 0.2 0.3 0.5
Interest Expense [Member] | Interest Rate Cap [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0.0 (0.1) 0.0 (0.1)
Interest Expense [Member] | Interest Rate Swap, 2017 Promissory Notes - Expired [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (1.7) (3.0) (5.3) (9.1)
Interest Expense [Member] | Interest Rate Swap, TRL-2023 Term Loan - Expired [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0.3 (1.0) 0.0 (3.1)
Interest Expense [Member] | Forward Interest Rate Swap, TILC - Expired [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0.2 0.0 0.4 0.0
Interest Expense [Member] | Interest Rate Swap, TRL-2023 Term Loan - Open        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax $ (1.9) [2] $ 0.0 $ (3.1) [2] $ 0.0
[1] Based on the fair value of open hedges as of September 30, 2025
[2] Includes changes in fair value related to the amortization of the initial off-market fair value.