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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Commitments and Contingencies [Abstract]            
Liabilities for various claims, complaints and other legal actions $ 543.1 $ 461.3 $ 543.1 $ 461.3 $ 473.8 $ 434.7
Construction defect portion of loss contingency accrual, percentage 99.00%   99.00%   99.00%  
Expenses related to legal claims     $ 46.2 41.1    
Estimated insurance recoveries related to legal claims $ 98.1 82.4 98.1 82.4 $ 81.2  
Surety bonds 2,100.0   2,100.0      
Outstanding letters of credit 219.5   219.5      
Home Building Consolidated            
Commitments and Contingencies [Abstract]            
Outstanding letters of credit 159.3   159.3      
Forestar Group [Member]            
Commitments and Contingencies [Abstract]            
Outstanding letters of credit 60.2   60.2      
HomeBuildingMember            
Commitments and Contingencies [Abstract]            
Earnest money deposits 999.8   999.8      
Remaining purchase price of land under option contracts 15,000.0   15,000.0      
HomeBuildingMember | Option Contracts Subject to Specific Performance Clauses [Member]            
Commitments and Contingencies [Abstract]            
Remaining purchase price of land under option contracts 136.9   136.9      
HomeBuildingMember | Cash [Member]            
Commitments and Contingencies [Abstract]            
Earnest money deposits 918.9   918.9      
HomeBuildingMember | Notes Payable, Other Payables [Member]            
Commitments and Contingencies [Abstract]            
Earnest money deposits 80.9   80.9      
Forestar Group [Member]            
Commitments and Contingencies [Abstract]            
Earnest money deposits 152.7   152.7      
Remaining purchase price of land under option contracts 1,600.0   1,600.0      
Increase (Decrease) in Earnest Money Deposits Outstanding 3.5 7.0 27.7 23.2    
Increase (Decrease) in Prepaid Expenses, Other 14.9 $ 12.9 43.1 $ 26.2    
Forestar Group [Member] | Option Contracts Subject to Specific Performance Clauses [Member]            
Commitments and Contingencies [Abstract]            
Remaining purchase price of land under option contracts $ 67.8   $ 67.8