v3.26.1
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