Railcar Leasing and Services Group - Lease Portfolio Sales (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2025

Jun. 30, 2024

Jun. 30, 2025

Jun. 30, 2024

Property Subject to or Available for Operating Lease [Line Items]

Proceeds From Sale Of Property Subject To Or Available For Operating Lease

$ 63.0

$ 186.7

Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment

$ 7.8

$ 22.7

13.7

24.8

Operating Segments [Member] | Leasing & Services

Property Subject to or Available for Operating Lease [Line Items]

Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment

^[1]

$ 7.8

$ 22.7

$ 13.7

$ 24.8

Operating Profit Margin

39.20%

45.50%

37.80%

40.30%

Operating Segments [Member] | Sales of Leased Railcars [Domain] | Leasing & Services

Property Subject to or Available for Operating Lease [Line Items]

Proceeds From Sale Of Property Subject To Or Available For Operating Lease

$ 29.3

$ 162.5

$ 63.0

$ 186.7

Gain (Loss) on Sale of Property, Plant and Equipment, Railroad Transportation Equipment

$ 7.8

$ 22.7

$ 13.7

$ 24.8

Operating Profit Margin

26.60%

14.00%

21.70%

13.30%

[1]	Significant expense categories and amounts align with the segment-level information that is regularly provided to and reviewed by the CODM. Intersegment expenses are included within the amounts shown.