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Property, Plant, and Equipment - Components of property, plant, and equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 $ 9,658.2 $ 9,539.6
Less: accumulated depreciation (2,598.6) (2,534.8)
Property, Plant and Equipment, Net 7,059.6 7,004.8
Railcars on Lease [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, Plant and Equipment, Net 6,717.5 6,654.8
Railcars on Lease [Member] | Intersegment Eliminations [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 [1] (1,061.7) (1,061.3)
Property, Plant and Equipment, Net (743.1) (750.2)
Negative Accumulated Depreciation PP&E- Deferred Profit 318.6 311.1
Wholly-owned subsidiaries | Railcars on Lease [Member] | Operating Segments [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 7,657.7 7,536.7
Less: accumulated depreciation (1,655.1) (1,604.9)
Property, Plant and Equipment, Net 6,002.6 5,931.8
Partially-owned subsidiaries | Railcars on Lease [Member] | Operating Segments [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 2,235.7 2,236.6
Less: accumulated depreciation (777.7) (763.4)
Property, Plant and Equipment, Net 1,458.0 1,473.2
Operating & Administrative Assets [Member]    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 826.5 827.6
Less: accumulated depreciation (484.4) (477.6)
Property, Plant and Equipment, Net 342.1 350.0
Operating & Administrative Assets [Member] | Land    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 16.4 16.1
Operating & Administrative Assets [Member] | Buildings and improvements    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 380.1 380.4
Operating & Administrative Assets [Member] | Machinery and other    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 421.8 419.8
Operating & Administrative Assets [Member] | Construction in progress    
Property, Plant and Equipment, Net [Abstract]    
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,921.7 and $1,922.5 $ 8.2 $ 11.3
[1] Includes deferred profit related to new railcar additions, sustainable railcar conversions, railcar modifications, and other betterments. The deferred profit is subsequently eliminated in consolidation.