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Railcar Leasing and Management Services Group - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2014
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | $ 2.5 | $ 2.7 |
Senior Notes [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | $ 0.2 | 0.3 |
Minimum |  |  |
Segment Reporting Information [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 1 year |  |
Maximum |  |  |
Segment Reporting Information [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 40 years |  |
Corporate Segment [Member] | Senior Notes [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | $ 0.2 | $ 0.3 |
Corporate Segment [Member] | Senior Notes [Member] | 4.55% Senior Notes Due October 2024 [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.55%
Railcar Leasing and Management Services Group | Minimum |  |  |
Segment Reporting Information [Line Items] |  |  |
Lessor, Operating Lease, Term of Contract | 1 year |  |
Railcar Leasing and Management Services Group | Maximum |  |  |
Segment Reporting Information [Line Items] |  |  |
Lessor, Operating Lease, Term of Contract | 10 years | 20 years |
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net book value of unpledged equipment | $ 1,289.5 |  |
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Non-recourse debt |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Collateral Amount | $ 4,296.0 |  |
Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railcar Leasing and Management Services Group | Railroad transportation equipment leased from independent owner trusts |  |  |
Segment Reporting Information [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 22 years |  |
TRIP Holdings | Railcar Leasing and Management Services Group | Non-recourse debt | TRIP Master Funding secured railcar equipment notes |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Collateral Amount | $ 1,249.7 |  |
TRL 2012 | Railcar Leasing and Management Services Group | Non-recourse debt | TRL 2012 secured railcar equipment notes |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Collateral Amount | 544.8 |  |
Property Lease Guarantee [Member] | Railcar Leasing and Management Services Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 3.0 |  |
Operating Segments | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 2.5 | $ 2.7 |
Operating Segments | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Senior Notes [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 0.0 | 0.0 |
Operating Segments | Partially-Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 0.0 | 0.0 |
Operating Segments | Partially-Owned Subsidiaries [Member] | Railcar Leasing and Management Services Group | Senior Notes [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 0.0 | 0.0 |
Operating Segments | Manufacturing and Corporate [Member] | Manufacturing and Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 0.0 | 0.0 |
Operating Segments | Manufacturing and Corporate [Member] | Manufacturing and Corporate [Member] | Senior Notes [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Debt Instrument, Unamortized Discount | $ 0.2 | $ 0.3 |

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