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Summary of Significant Accounting Policies Revenue Recognition and Remaining performance obligation (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Contract Receivable | $ 10.1 | $ 10.2
Rail Group | Railcars |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 2,865.5 |
Revenue, remaining performance obligation expected to be delivered in current year | 50.00% |
Rail Group | Railcars | External Customers |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 1,892.0 |
Rail Group | Railcars | Leasing |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | 973.5 |
Rail Group | Maintenance services |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 70.4 |
Revenue, remaining performance obligation expected to be delivered in current year | 78.00% |
Railcar Leasing and Management Services Group |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 100.1 |
Revenue, remaining performance obligation expected to be delivered in current year | 12.00% |

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