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Sale of Assets (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) location | Jun. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of security investments sold | security |  | 1 |  |
Proceeds from Sale of Securities, Operating Activities |  | $ 6.4 |  |
Pre-tax gain on sale of security investment |  | 3.9 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Properties |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of locations sold | location |  |  | 2 |
Proceeds from sale of assets |  |  | $ 7.6 |
Gain on sale of assets |  |  | $ 5.7 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Farm Center | Florida |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of locations sold | location |  |  | 4 |
Proceeds from sale of assets | $ 17.4 |  |  |
Gain on sale of assets | $ 4.7 |  |  |
Working capital adjustment receivable |  |  | $ 3.6 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Grain Elevators | Humboldt, Kenton and Dyer, Tennessee |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration on sell of assets |  |  |  | $ 19.5
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Como Location |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration on sell of assets |  | $ 1.3 |  |

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