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Basis of Presentation Details (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 05, 2017
Jun. 30, 2018
Jun. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
Entity Information [Line Items]          
Real estate     $ 1,049.5   $ 498.0
Contract with Customer, Liability     9.9 $ 6.4 0.0
Deferred income     9.4   $ 11.6
Majority Shareholder [Member] | D.R. Horton, Inc. [Member]          
Entity Information [Line Items]          
Sale of Stock, Percentage of Ownership after Transaction 75.00%        
Accounting Standards Update 2016-18 [Member]          
Entity Information [Line Items]          
Increase (Decrease) in Restricted Cash   $ (39.7)      
Accounting Standards Update 2014-09 [Member]          
Entity Information [Line Items]          
Real estate     8.7    
Contract with Customer, Liability     9.9    
Deferred income     (1.2)    
Pro Forma [Member] | Accounting Standards Update 2014-09 [Member]          
Entity Information [Line Items]          
Real estate     1,040.8    
Contract with Customer, Liability     0.0    
Deferred income     $ 10.6