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Consolidation of a Real Estate Development Company - Revenues and Expenses Recognized in the Partnership's Condensed Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue of a consolidated real estate VIE    
Land development services $ 91.8 $ 19.1
Investment income 0.8 5.3
Revenue of a consolidated real estate VIE 92.6 24.4
Interest and other expenses of a consolidated real estate VIE:    
Costs of products sold and services rendered 55.9 10.7
Interest expense 8.9 7.5
Change in fair value of loans payable 0.6 0.7
Compensation and benefits 1.4 1.7
G&A and other expenses 52.8 2.8
Interest and other expenses of a consolidated real estate VIE $ 119.6 $ 23.4