Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Apr. 17, 2026
Corporate Segment [Member] | Senior Notes due 2028 | 7.75% Senior Notes Due 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.75%
Corporate Segment [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 600.0
Proceeds from Lines of Credit		0.0
Repayments of Lines of Credit		0.0
Line of Credit Facility, Remaining Borrowing Capacity		$ 595.6
Debt Instrument, Basis Spread on Variable Rate		1.50%
Debt Instrument, Interest Rate, Effective Percentage		5.23%
Line of Credit Facility, Interest Rate at Period End		0.20%
Corporate Segment [Member] | Letter of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$ 4.4
TILC [Member] | Leasing & Services | Revolving Credit Facility [Member] | Line of Credit [Member] | TILC Warehouse Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		800.0
Repayments of Lines of Credit		18.1
Line of Credit Facility, Remaining Borrowing Capacity		$ 339.6
Debt Instrument, Basis Spread on Variable Rate		1.75%
Debt Instrument, Interest Rate, Effective Percentage		5.42%
Wholly-owned subsidiaries | Leasing & Services | Secured Debt [Member] | TRL-2025 Series 2026-1 Class A Green Secured Railcar Equipment Notes [Member] | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.35%
Debt Instrument, Face Amount			$ 447.4
Wholly-owned subsidiaries | Leasing & Services | Secured Debt [Member] | TRL-2025 Series 2026-1 Class B Green Secured Railcar Equipment Notes [Member] | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.56%
Debt Instrument, Face Amount			$ 33.4
Wholly-owned subsidiaries | Leasing & Services | Secured Debt [Member] | TRL-2019 Series 2019-1 Secured Railcar Equipment Notes [Member] | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.82%
Repayments of Debt	$ 377.1
Minimum | Corporate Segment [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End		0.175%
Maximum | Corporate Segment [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End		0.40%