Income Taxes Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Income Tax Disclosure [Line Items] | |||||
| Effective Income Tax Rate Reconciliation, Percent | 23.70% | 15.80% | 23.80% | 18.40% | |
| Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% | 21.00% | |
| Inflation Reduction Act - Purchase of Federal Tax Credits | $ 40.0 | ||||
| Inflation Reduction Act - Payment to Acquire Federal Tax Credits | 38.4 | ||||
| Effective Income Tax Rate Reconciliation, Tax Credit, Amount | $ 1.6 | ||||
| Deferred income taxes | $ 1,178.0 | $ 1,178.0 | $ 1,129.0 | ||
| Railcars on Lease [Member] | |||||
| Income Tax Disclosure [Line Items] | |||||
| Deferred income taxes | $ 1,300.0 | $ 1,300.0 | $ 1,300.0 | ||