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Railcar Leasing and Services Group - Lease Portfolio Sales (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Property Subject to or Available for Operating Lease [Line Items] |  |
Lease portfolio sales | $ 24.2 | $ 56.7
Operating profit on lease portfolio sales | 115.2 | 69.0
Operating Segments [Member] |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Operating profit on lease portfolio sales | 144.1 | 108.7
Operating Segments [Member] | Leasing & Services |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Operating profit on lease portfolio sales | $ 100.3 | $ 84.6
Operating Profit Margin | 35.20% | 36.30%
Operating Segments [Member] | Sales of Leased Railcars [Domain] | Leasing & Services |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Lease portfolio sales | $ 24.2 | $ 56.7
Operating Profit Margin | 8.70% | 23.80%
Operating Segments [Member] | Sales of Leased Railcars, Excluding Sales-Type Leases | Leasing & Services |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Operating profit on lease portfolio sales | $ 2.1 | $ 13.5

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