Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) railcar	Dec. 31, 2024 USD ($) railcar	Dec. 31, 2023 USD ($)
Operating Leased Assets [Line Items]
Number of railcars received | railcar		728
Lessee, Lease, Number of Railcars Leased | railcar	3,627
Direct Financing Lease, Lease Income	$ 12.7	$ 13.5	$ 12.6
Operating Lease, Lease Income, Lease Payments	1,369.1	1,263.5	1,145.1
Operating Lease, Variable Lease Income	104.4	104.1	93.7
Operating Lease, Lease Income	1,473.5	1,367.6	1,238.8
Lease Income	1,486.2	1,381.1	$ 1,251.4
Total contractual lease payments receivable	156.1	160.0
Estimated unguaranteed residual value of leased assets	9.4	17.2
Unearned income	(61.3)	(58.9)
Finance leases	104.2	118.3
NEW YORK STOCK EXCHANGE, INC. [Member]
Operating Leased Assets [Line Items]
Finance leases	$ 104.2	$ 118.3