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Summary of Significant Accounting Policies Lessee Accounting (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Lessee, Lease, Description [Line Items] |  |  |  |
Lessee, Operating Lease, Renewal Term |  | 5 years |  |
Lessee, Operating Lease, Option to Terminate |  | one year |  |
Finance Lease, Principal Payments |  | $ 0.0 |  |
Operating lease expense |  | 5.3 | $ 4.3 |
Cash flows from operating activities |  | 5.3 | 4.3 |
Right-of-use assets recognized in exchange for new lease liabilities |  | 4.2 | $ 2.1 |
Right-of-use assets (1) | [1] | 100.9 |  | $ 100.6
Lease liabilities (2) | [2] | $ 118.0 |  | $ 118.2
Weighted average remaining lease term |  | 9 years 1 month 6 days |  | 9 years 3 months 18 days
Weighted average discount rate (3) | [3] | 3.70% |  | 3.60%
Remaining nine months of 2024 |  | $ 15.7 |  |
2025 |  | 18.9 |  |
2026 |  | 17.2 |  |
2027 |  | 16.0 |  |
2028 |  | 12.5 |  |
Thereafter |  | 58.3 |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  | 138.6 |  |
Less: Present value adjustment |  | (20.6) |  |
Railcars on Lease [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Remaining nine months of 2024 |  | 6.6 |  |
2025 |  | 8.2 |  |
2026 |  | 7.7 |  |
2027 |  | 7.2 |  |
2028 |  | 5.1 |  |
Thereafter |  | 6.8 |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  | 41.6 |  |
Operating & Administrative Assets [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Remaining nine months of 2024 |  | 9.1 |  |
2025 |  | 10.7 |  |
2026 |  | 9.5 |  |
2027 |  | 8.8 |  |
2028 |  | 7.4 |  |
Thereafter |  | 51.5 |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  | $ 97.0 |  |
Minimum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 1 year |  |
Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 13 years |  |
[1] | Included in other assets in our Consolidated Balance Sheets.
[2] | Included in other liabilities in our Consolidated Balance Sheets.
[3] | As the rate implicit in our leases is not readily determinable, we use the incremental borrowing rate of our Trinity Industries Leasing Company ("TILC") warehouse loan facility for railcar leases or our revolving credit facility for operating and administrative leases at lease commencement to determine the present value of lease payments.

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