Debt - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 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	$ 1,762.4	1,444.3
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%
Repayments of Senior Debt	$ 400.0
Loss on extinguishment of debt	$ 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%
Debt Instrument, Face Amount	$ 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
Proceeds from Lines of Credit	190.0
Repayments of Lines of Credit	190.0
Line of Credit Facility, Maximum Borrowing Capacity	$ 595.6
Debt Instrument, Basis Spread on Variable Rate	1.50%
Debt Instrument, Interest Rate, Effective Percentage	6.44%
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		$ 1,000.0
Proceeds from Lines of Credit	946.5
Repayments of Lines of Credit	952.8
Line of Credit Facility, Remaining Borrowing Capacity	277.0
Line of Credit Facility, Maximum Borrowing Capacity	$ 106.2
Debt Instrument, Basis Spread on Variable Rate	1.75%
Debt Instrument, Interest Rate, Effective Percentage	6.95%
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
Repayments of Debt	94.1
Payment for Debt Extinguishment or Debt Prepayment Cost	0.6
Write off of Deferred Debt Issuance Cost	$ 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%
Debt Instrument, Face Amount	$ 432.4
Payments of Debt Issuance Costs	$ 4.4
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%