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Debt - Components of debt (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Debt Instrument [Line Items] |  |
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | $ 399.8 | $ 399.7
Unamortized Debt Issuance Expense | 2.2 | 2.3
Debt and Capital Lease Obligations | 397.6 | 397.4
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount | 4,252.7 | 3,664.2
Non-Recourse Debt, Debt Issuance Costs | 34.4 | 32.4
Non-recourse debt | 4,218.3 | 3,631.8
Total debt | 4,615.9 | 4,029.2
Long-term Debt, Fair Value | 4,769.1 | 4,041.9
Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 399.8 | 399.7
Unamortized Debt Issuance Expense | 2.2 | 2.3
Long-term Debt, Fair Value | 398.4 | 343.7
Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 4,218.3 | 3,631.8
Senior Notes [Member] | Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 399.8 | 399.7
Long-term Debt, Fair Value | $ 398.4 | 343.7
Revolving Credit Facility [Member] | Line of Credit [Member] | Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.75% |
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | $ 0.0 | 0.0
Long-term Debt, Fair Value | 0.0 | 0.0
Partially-Owned Subsidiaries [Member] |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 1,298.9 | 1,315.2
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross | 1,310.7 | 1,327.9
Non-Recourse Debt, Debt Issuance Costs | 11.8 | 12.7
Non-recourse debt | 1,298.9 | 1,315.2
Long-term Debt, Fair Value | 1,357.8 | 1,333.9
Partially-Owned Subsidiaries [Member] | TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross | 381.1 | 386.2
Long-term Debt, Fair Value | 389.0 | 370.9
Partially-Owned Subsidiaries [Member] | TRIP Master Funding Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross | 929.6 | 941.7
Long-term Debt, Fair Value | 968.8 | 963.0
Wholly Owned Subsidiaries [Member] |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 2,919.4 | 2,316.6
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount | 2,942.0 | 2,336.3
Non-Recourse Debt, Debt Issuance Costs | 22.6 | 19.7
Non-recourse debt | 2,919.4 | 2,316.6
Long-term Debt, Fair Value | 3,012.9 | 2,364.3
Wholly Owned Subsidiaries [Member] | 2006 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross | 120.4 | 133.4
Long-term Debt, Fair Value | 126.0 | 138.0
Wholly Owned Subsidiaries [Member] | 2009 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross | 153.8 | 159.7
Long-term Debt, Fair Value | 158.0 | 174.0
Wholly Owned Subsidiaries [Member] | 2010 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross | 252.9 | 257.0
Long-term Debt, Fair Value | 268.8 | 264.0
Wholly Owned Subsidiaries [Member] | 2017 Secured Railcar Equipment Notes [Member] [Domain] | Promissory Notes [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross | 643.6 | 660.2
Long-term Debt, Fair Value | 643.6 | 660.2
Wholly Owned Subsidiaries [Member] | 2018 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount | 462.3 | 472.2
Long-term Debt, Fair Value | 485.5 | 475.2
Wholly Owned Subsidiaries [Member] | TRIHC 2018 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount | 271.6 | 279.0
Long-term Debt, Fair Value | 276.6 | 278.1
Wholly Owned Subsidiaries [Member] | 2019 Secured Railcar Equipment Notes [Domain] [Domain] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount | 526.3 | 0.0
Long-term Debt, Fair Value | $ 543.3 | 0.0
TILC [Member] | Revolving Credit Facility [Member] | TILC Warehouse Facility [Member] | Line of Credit [Member] | Railcar Leasing and Management Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.03% |
Long-term Line of Credit | $ 511.1 | 374.8
Long-term Debt, Fair Value | $ 511.1 | $ 374.8
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.25% |

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- Definition Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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