Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 1.5	$ 0.0
Proceeds from Debt, Net of Issuance Costs		$ 1,722.2	1,253.9
Corporate Segment [Member] | Senior Notes due 2024 | 4.55% Senior Notes Due October 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.55%	4.55%
Repayments of Senior Debt		$ 400.0
Loss on extinguishment of debt	$ 0.1	$ 0.1
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%	7.75%
Debt Instrument, Face Amount	$ 600.0	$ 600.0	$ 400.0
Proceeds from Issuance of Senior Long-Term Debt		200.0
Proceeds from Debt, Net of Issuance Costs		209.0
Payments of Debt Issuance Costs		3.0
Corporate Segment [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	600.0	600.0
Proceeds from Lines of Credit		190.0
Repayments of Lines of Credit		190.0
Line of Credit Facility, Maximum Borrowing Capacity	$ 594.8	$ 594.8
Debt Instrument, Basis Spread on Variable Rate		1.75%
Debt Instrument, Interest Rate, Effective Percentage	7.19%	7.19%
Line of Credit Facility, Interest Rate at Period End	0.25%	0.25%
Corporate Segment [Member] | Letter of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 5.2	$ 5.2
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	800.0		$ 1,000.0
Proceeds from Lines of Credit		905.6
Repayments of Lines of Credit		946.7
Line of Credit Facility, Remaining Borrowing Capacity	311.8	311.8
Line of Credit Facility, Maximum Borrowing Capacity	$ 133.3	$ 133.3
Debt Instrument, Basis Spread on Variable Rate		1.75%
Debt Instrument, Interest Rate, Effective Percentage	7.08%	7.08%
Payments of Debt Issuance Costs		$ 3.6
Repayments of Debt		218.9
Wholly-owned subsidiaries | Secured Debt [Member] | 2009 Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.66%
Loss on extinguishment of debt	$ 1.4	1.4
Repayments of Debt		94.1
Payment for Debt Extinguishment or Debt Prepayment Cost	0.6	0.6
Write off of Deferred Debt Issuance Cost	$ 0.8	$ 0.8
Wholly-owned subsidiaries | Leasing & Services | Secured Debt [Member] | TRL-2021 Series 2024-1 Class A Green Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.78%	5.78%
Debt Instrument, Face Amount	$ 432.4	$ 432.4
Payments of Debt Issuance Costs		$ 4.2
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%	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%	0.40%