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Notes Payable (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]        
Letters of Credit Outstanding, Amount $ 253.5      
Notes payable 5,255.3 $ 5,412.4    
Fair Value, Inputs, Level 2 [Member]        
Debt Instrument [Line Items]        
Notes payable, Fair value 3,900.0 3,900.0    
Fair Value, Inputs, Level 3 [Member]        
Debt Instrument [Line Items]        
Notes payable, Fair value 1,400.0 1,600.0    
Estimate of Fair Value Measurement [Member]        
Debt Instrument [Line Items]        
Notes payable, Fair value 5,300.0 5,500.0    
Intersegment Eliminations [Member]        
Debt Instrument [Line Items]        
Notes payable (0.6) (0.7)    
Forestar Group [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 7.6 8.0    
Notes payable 704.9 704.5    
Financial Services [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity 1,400.0      
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Repurchase Agreements 1,700.0      
Participating Mortgage Loans, Mortgage Obligations, Amount 1,700.0      
Advance Pay Downs on Mortgage Repurchase Facility $ 436.5      
Assets Sold under Agreements to Repurchase, Interest Rate 2.10%      
Notes payable $ 1,260.0 1,494.6    
Financial Services [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity 1,633.0      
Forestar Group [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity 410.0      
Line of Credit Facility, Maximum Borrowing Capacity $ 600.0      
Letters of credit, sublimit borrowing capacity, as a percentage 50.00%      
Revolving credit facility $ 0.0 0.0    
Letters of Credit Outstanding, Amount 66.3      
Line of Credit Facility, Remaining Borrowing Capacity 343.7      
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 704.9 704.5    
Home Building Consolidated        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 15.4 16.5    
Line of Credit Facility, Current Borrowing Capacity 2,190.0      
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000.0      
Letters of credit, sublimit borrowing capacity, as a percentage 100.00%      
Revolving credit facility $ 0.0 0.0    
Letters of Credit Outstanding, Amount 187.2      
Line of Credit Facility, Remaining Borrowing Capacity 2,000.0      
Debt Repurchase Authorization Remaining 500.0      
Authorized Repurchase Of Debt Securities       $ 500.0
Notes payable 3,290.4 3,213.3    
4.375% senior notes due 2022 [Member] | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 349.7 349.6    
Debt Instrument, Interest Rate, Stated Percentage 4.375%      
4.75% senior notes due 2023 [Member] | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 299.6 299.5    
Debt Instrument, Interest Rate, Stated Percentage 4.75%      
5.75% senior notes due 2023 [Member] | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 399.2 399.1    
Debt Instrument, Interest Rate, Stated Percentage 5.75%      
SeniorNoteFortyTwo [Member] | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 497.5 497.3    
Debt Instrument, Interest Rate, Stated Percentage 2.50%      
SeniorNoteFortyFour | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 496.5 496.2    
Debt Instrument, Interest Rate, Stated Percentage 2.60%      
Senior Note Forty Six | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 594.8 594.5    
Debt Instrument, Interest Rate, Stated Percentage 1.30%      
Senior Note Forty Five | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 495.1 494.9    
Debt Instrument, Interest Rate, Stated Percentage 1.40%      
Senior Note Member Forty Six | Forestar Group [Member]        
Debt Instrument [Line Items]        
Notes payable $ 395.7 395.5    
Debt Instrument, Interest Rate, Stated Percentage 3.85%      
Senior Note Member Forty Three | Forestar Group [Member]        
Debt Instrument [Line Items]        
Notes payable $ 296.7 296.5    
Debt Instrument, Interest Rate, Stated Percentage 5.00%      
Secured Debt [Member] | Forestar Group [Member]        
Debt Instrument [Line Items]        
Notes payable $ 12.5 12.5    
Secured Debt [Member] | Home Building Consolidated        
Debt Instrument [Line Items]        
Notes payable $ 158.0 $ 82.2