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