Sale of Assets (Details) $ in Millions			3 Months Ended
	Mar. 31, 2017 USD ($) location	May 02, 2016 USD ($) location	Sep. 30, 2017 USD ($) location
Retail Property
Business Acquisition [Line Items]
Number of locations sold | location			2
Proceeds from sale of assets			$ 7.6
Gain on sale of assets			$ 5.7
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
Grain and Agronomy | Iowa
Business Acquisition [Line Items]
Number of locations sold | location		8
Gain on sale of assets		$ 54.3