Income Taxes Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Income Tax Disclosure [Line Items]
Effective Income Tax Rate Reconciliation, Percent	24.20%	20.30%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Deferred income taxes	$ 1,148.0		$ 1,129.0
Railcars on Lease [Member]
Income Tax Disclosure [Line Items]
Deferred income taxes	$ 1,300.0		$ 1,300.0