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Other Matters - Sale of Certain Railcars (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 16, 2025 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2026 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |
Total number of railcars sold |  | 193 |
Total consideration |  | $ 14.4 | $ 6.7
(Gain) loss on disposal or impairment of assets, net |  | $ (5.5) |
Loss on disposal, statement of income or comprehensive income [extensible enumeration] |  | Gain/loss on disposal or impairment of assets, net |
Certain Railcars |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |
Total number of railcars sold | 68 |  |
Total consideration | $ 2.1 |  |
(Gain) loss on disposal or impairment of assets, net | $ 0.1 |  | $ 1.9
Certain Railcars |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |
Total number of railcars to be sold |  | 135 |

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