Derivatives Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
TILC Warehouse Back to Back Swap Agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 800.0			$ 800.0
Derivative, Cap Interest Rate	2.50%			2.50%
Derivative Asset	$ 12.4			$ 12.4
TILC Warehouse Back to Back Swap Agreements | Other Operating Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Operating Income (Expense), Net	[1]	Other Operating Income (Expense), Net	Other Operating Income (Expense), Net	[1]	Other Operating Income (Expense), Net
TILC Back to Back Swap Agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 800.0			$ 800.0
Derivative, Cap Interest Rate	2.50%			2.50%
Derivative Liability	$ (12.4)			$ (12.4)
TILC Back to Back Swap Agreements | Other Operating Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Operating Income (Expense), Net	[1]	Other Operating Income (Expense), Net	Other Operating Income (Expense), Net	[1]	Other Operating Income (Expense), Net

[1] Comprised of back-to-back interest rate caps entered into with the same counterparty that offset and do not have a net effect on Trinity's consolidated earnings. These derivative contracts were entered into in connection with our risk management objectives.