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Debt - Components of debt (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Debt: $ 5,699.7 $ 5,754.2
Recourse    
Debt Instrument [Line Items]    
Debt: 597.7 794.6
Nonrecourse    
Debt Instrument [Line Items]    
Debt: 5,102.0 4,959.6
Level 2    
Debt Instrument [Line Items]    
Long-term Debt, Fair Value 630.3 812.1
Level 3    
Debt Instrument [Line Items]    
Long-term Debt, Fair Value 3,503.1 3,192.7
Corporate Segment [Member]    
Debt Instrument [Line Items]    
Debt, Net of Unamortized Premium and Unamortized Discount, Gross of Unamortized Debt Issuance Costs 604.6 799.9
Less: unamortized debt issuance costs 6.9 5.3
Senior Notes due 2024 | Corporate Segment [Member]    
Debt Instrument [Line Items]    
Senior Notes 0.0 399.9
Debt Instrument, Unamortized Discount 0.0 0.1
Senior Notes due 2028 | Corporate Segment [Member]    
Debt Instrument [Line Items]    
Senior Notes 604.6 400.0
Debt Instrument, Unamortized Premium 4.6 0.0
Wholly Owned Subsidiaries [Member] | Nonrecourse    
Debt Instrument [Line Items]    
Debt: 4,007.4 3,819.2
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Debt, Net of Unamortized Premium and Unamortized Discount, Gross of Unamortized Debt Issuance Costs 4,024.1 3,836.5
Less: unamortized debt issuance costs 16.7 17.3
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member] | Nonrecourse    
Debt Instrument [Line Items]    
Debt: 4,007.4 3,819.2
Wholly Owned Subsidiaries [Member] | Secured Debt [Member] | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount 0.3 0.2
Debt, Net of Unamortized Premium and Unamortized Discount, Gross of Unamortized Debt Issuance Costs 2,482.4 2,246.7
Wholly Owned Subsidiaries [Member] | 2017 Secured Railcar Equipment Notes [Member] [Domain] | Promissory Notes [Member] | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount 2.0 3.5
Debt, Net of Unamortized Premium and Unamortized Discount, Gross of Unamortized Debt Issuance Costs 641.9 673.7
Wholly Owned Subsidiaries [Member] | TRL-2023 Term Loan | Line of Credit [Member] | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Long-term Line of Credit 326.2 334.5
Wholly Owned Subsidiaries [Member] | Other Equipment Financing | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Secured Debt, Other 50.6 52.3
Partially-Owned Subsidiaries [Member] | Nonrecourse    
Debt Instrument [Line Items]    
Debt: 1,094.6 1,140.4
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Less: unamortized debt issuance costs 5.6 7.4
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member] | Nonrecourse    
Debt Instrument [Line Items]    
Debt: 1,094.6 1,140.4
Partially-Owned Subsidiaries [Member] | Secured Debt [Member] | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount 0.1 0.1
Debt, Net of Unamortized Premium and Unamortized Discount, Gross of Unamortized Debt Issuance Costs 1,100.2 1,147.8
Revolving Credit Facility [Member] | Line of Credit [Member] | Corporate Segment [Member]    
Debt Instrument [Line Items]    
Long-term Line of Credit 0.0 0.0
Revolving Credit Facility [Member] | TILC [Member] | TILC Warehouse Facility [Member] | Line of Credit [Member] | Railcar Leasing and Services Group [Member]    
Debt Instrument [Line Items]    
Long-term Line of Credit $ 523.0 $ 529.3