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Notes Payable (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Apr. 30, 2021
Oct. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]                
Letters of Credit Outstanding, Amount   $ 189.6            
Notes payable   4,472.3       $ 4,283.3    
Intersegment Eliminations [Member]                
Debt Instrument [Line Items]                
Notes payable   (2.7)       (4.8)    
Forestar Group [Member]                
Debt Instrument [Line Items]                
Unamortized Debt Issuance Expense   7.9       8.9    
Notes payable   654.6       641.1    
Financial Services [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity   1,400.0            
Line of Credit Facility, Maximum Borrowing Capacity   1,633.0            
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Repurchase Agreements   1,690.0            
Participating Mortgage Loans, Mortgage Obligations, Amount   1,660.0            
Advance Pay Downs on Mortgage Repurchase Facility   $ 454.8            
Assets Sold under Agreements to Repurchase, Interest Rate   2.10%            
Notes payable   $ 1,203.5       1,132.6    
Financial Services [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity   1,800.0            
Forestar Group [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity   380.0            
Line of Credit Facility, Maximum Borrowing Capacity   $ 570.0            
Letters of credit, sublimit borrowing capacity, as a percentage   50.00%            
Revolving credit facility   $ 0.0       0.0    
Letters of Credit Outstanding, Amount   46.0            
Line of Credit Facility, Remaining Borrowing Capacity   334.0            
Debt Repurchase Authorization Remaining   30.0            
Authorized Repurchase Of Debt Securities             $ 30.0  
Letter of Credit, Maximum Borrowing Capacity (in dollars)   100.0            
Notes payable   654.6       641.1    
Forestar Group [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity       $ 410.0        
Line of Credit Facility, Maximum Borrowing Capacity       600.0        
Home Building Consolidated                
Debt Instrument [Line Items]                
Unamortized Debt Issuance Expense   13.3       10.7    
Line of Credit Facility, Current Borrowing Capacity   1,590.0            
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,500.0            
Letters of credit, sublimit borrowing capacity, as a percentage   100.00%            
Revolving credit facility   $ 0.0       0.0    
Letters of Credit Outstanding, Amount   143.6            
Line of Credit Facility, Remaining Borrowing Capacity   1,450.0            
Line of Credit, Current   0.0       0.0    
Debt Repurchase Authorization Remaining   500.0            
Authorized Repurchase Of Debt Securities               $ 500.0
Notes payable   2,614.2       2,509.6    
Home Building Consolidated | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity       2,190.0        
Line of Credit Facility, Maximum Borrowing Capacity       3,000.0        
Home Building Consolidated | Short-term Debt [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity   375.0            
Line of Credit Facility, Maximum Borrowing Capacity   $ 550.0            
2.55% senior notes due 2020 [Member] | Home Building Consolidated                
Debt Instrument [Line Items]                
Maturities of Senior Debt     $ 400.0          
Debt Instrument, Interest Rate, Stated Percentage   2.55% 2.55%          
Notes payable   $ 0.0       399.8    
4.375% senior notes due 2022 [Member] | Home Building Consolidated                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage   4.375%            
Notes payable   $ 349.4       349.2    
4.75% senior notes due 2023 [Member] | Home Building Consolidated                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage   4.75%            
Notes payable   $ 299.4       299.2    
5.75% senior notes due 2023 [Member] | Home Building Consolidated                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage   5.75%            
Notes payable   $ 398.9       398.7    
SeniorNoteFortyTwo [Member] | Home Building Consolidated                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage   2.50%            
Notes payable   $ 496.9       496.5    
SeniorNoteFortyFour | Home Building Consolidated                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage   2.60%            
Notes payable   $ 495.8       495.1    
Senior Note Forty Five | Home Building Consolidated                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount         $ 500.0      
Debt Instrument, Interest Rate, Effective Percentage         1.60%      
Debt Instrument, Interest Rate, Stated Percentage   1.40%     1.40%      
Notes payable   $ 494.3       0.0    
Senior Note Member Forty One [Member] | Forestar Group [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount   $ 350.0            
Debt Instrument, Interest Rate, Stated Percentage   8.00%            
Notes payable   $ 345.9       345.2    
Senior Note Member Forty One [Member] | Forestar Group [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount $ 350.0              
Debt Instrument, Redemption Price       365.6        
Debt Instrument, Redemption, Accrued and Unpaid Interest       1.6        
Debt Instrument, Redemption, Call Premium       14.0        
Senior Note Member Forty Three | Forestar Group [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage   5.00%            
Notes payable   $ 296.2       295.9    
Secured Debt [Member] | Forestar Group [Member]                
Debt Instrument [Line Items]                
Notes payable   12.5       0.0    
Secured Debt [Member] | Home Building Consolidated                
Debt Instrument [Line Items]                
Notes payable   $ 79.5       $ 71.1    
Senior Note Forty Six | Forestar Group [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount       $ 400.0        
Debt Instrument, Interest Rate, Effective Percentage       4.10%        
Debt Instrument, Interest Rate, Stated Percentage       3.85%