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Derivative Instruments and Fair Value Accounting Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 1,288.5 | $ 1,275.5 | $ 1,250.4 | $ 1,269.6
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | $ 249.3 |  |  |
Derivative, Average Fixed Interest Rate | [1] | 4.41% |  |  |
Derivative Asset |  | $ 0.0 |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | $ 256.0 |  |  |
Derivative, Average Fixed Interest Rate | [1] | 2.86% |  |  |
Derivative Asset |  | $ 0.0 |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | $ 169.3 |  |  |
Derivative, Cap Interest Rate |  | 3.00% |  |  |
Derivative Asset |  | $ 0.0 |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap, 2017 Promissory Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | $ 401.4 |  |  |
Derivative, Average Fixed Interest Rate | [1] | 2.31% |  |  |
Derivative Asset |  | $ 14.4 |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap, TRL-2023 Term Loan |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | $ 265.4 |  |  |
Derivative, Average Fixed Interest Rate | [1] | 3.79% |  |  |
Derivative Asset |  | $ 2.2 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 0.2 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 0.4 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | (0.1) |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, 2017 Promissory Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | (13.8) |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, TRL-2023 Term Loan |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | (2.1) |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 0.0 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 0.5 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 0.0 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, 2017 Promissory Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 0.0 |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, TRL-2023 Term Loan |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 0.0 |  |  |
[1] | Weighted average fixed interest rate, except for the interest rate cap on the 2017 promissory notes

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