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Income Taxes Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Income Tax Disclosure [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 15.80% | 22.70% | 18.40% | 23.80% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% | 21.00% |
Deferred income taxes | $ 1,070.8 |  | $ 1,070.8 |  | $ 1,075.6
Inflation Reduction Act - Purchase of Federal Tax Credits | 40.0 |  | 40.0 |  |
Inflation Reduction Act - Payment to Acquire Federal Tax Credits | 38.4 |  | 38.4 |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Amount | 1.6 |  | 1.6 |  |
Railcars on Lease [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Deferred income taxes | $ 1,100.0 |  | $ 1,100.0 |  | $ 1,100.0

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