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Notes Payable (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2020
May 01, 2020
Feb. 01, 2020
Oct. 01, 2019
Sep. 30, 2019
Debt Instrument [Line Items]          
Document Period End Date Jun. 30, 2020        
Unsecured:          
Notes payable $ 4,297.3       $ 3,399.4
Home Building [Member]          
Debt Instrument [Line Items]          
Debt Repurchase Authorization Remaining 500.0        
Unsecured:          
Notes payable 2,490.3       2,047.6
Unamortized Debt Issuance Expense 11.7       5.4
Forestar Group [Member]          
Unsecured:          
Notes payable 640.6       460.5
Unamortized Debt Issuance Expense 9.4       6.2
Financial Services [Member]          
Unsecured:          
Notes payable 1,172.9       888.9
Forestar Group [Member]          
Unsecured:          
Notes payable 640.6       462.9
Revolving credit facility 0.0       0.0
Home Building Consolidated          
Unsecured:          
Notes payable 2,483.8       2,047.6
Revolving credit facility 0.0       0.0
Line of Credit, Current $ 0.0       0.0
4.0% senior notes due 2020 [Member] | Home Building [Member]          
Unsecured:          
Stated interest rate 4.00%        
4.0% senior notes due 2020 [Member] | Home Building Consolidated          
Unsecured:          
Stated interest rate 4.00%        
Notes payable $ 0.0       499.6
2.55% senior notes due 2020 [Member] | Home Building Consolidated          
Unsecured:          
Stated interest rate 2.55%        
Notes payable $ 399.6       398.9
4.375% senior notes due 2022 [Member] | Home Building Consolidated          
Unsecured:          
Stated interest rate 4.375%        
Notes payable $ 349.1       348.8
4.75% senior notes due 2023 [Member] | Home Building Consolidated          
Unsecured:          
Stated interest rate 4.75%        
Notes payable $ 299.2       298.9
5.75% senior notes due 2023 [Member] | Home Building Consolidated          
Unsecured:          
Stated interest rate 5.75%        
Notes payable $ 398.6       398.4
SeniorNoteFortyTwo [Member] | Home Building [Member]          
Unsecured:          
Stated interest rate       2.50%  
Debt Instrument, Interest Rate, Effective Percentage       2.70%  
SeniorNoteFortyTwo [Member] | Home Building Consolidated          
Unsecured:          
Stated interest rate 2.50%        
Notes payable $ 496.2       0.0
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member]          
Unsecured:          
Stated interest rate 3.75%        
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member]          
Unsecured:          
Stated interest rate 3.75%        
Notes payable $ 0.0       119.1
Senior Note Member Forty One [Member] | Forestar Group [Member]          
Unsecured:          
Stated interest rate 8.00%        
Senior Note Member Forty One [Member] | Forestar Group [Member]          
Unsecured:          
Stated interest rate 8.00%        
Notes payable $ 344.8       343.8
Senior Note Member Forty Three | Forestar Group [Member]          
Unsecured:          
Stated interest rate     5.00%    
Debt Instrument, Interest Rate, Effective Percentage     5.20%    
Senior Note Member Forty Three | Forestar Group [Member]          
Unsecured:          
Stated interest rate 5.00%        
Notes payable $ 295.8       0.0
SeniorNoteFortyFour | Home Building [Member]          
Unsecured:          
Stated interest rate   2.60%      
Debt Instrument, Interest Rate, Effective Percentage   2.80%      
SeniorNoteFortyFour | Home Building Consolidated          
Unsecured:          
Stated interest rate 2.60%        
Notes payable $ 494.8       0.0
Secured Debt [Member] | Home Building Consolidated          
Unsecured:          
Notes payable $ 46.3       $ 103.0