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Notes Payable - Principal Amounts (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Oct. 05, 2017
Sep. 30, 2017
Summary of notes payable at principal amounts, net of unamortized discounts        
Notes payable $ 3,203.5     $ 2,871.6
Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Line of credit, amount outstanding 0.0     0.0
Notes payable 2,445.9     2,451.6
Financial Services [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Notes payable 637.7     420.0
Forestar Consolidated [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Notes payable 119.9      
Forestar Group [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Line of credit, amount outstanding 0.0      
Notes payable $ 111.7      
Senior Note Twenty Six [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 3.625% 3.625%    
Notes payable $ 0.0     399.7
Senior Note Twenty Nine [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 3.75%      
Notes payable $ 499.6     498.8
Senior Note Member Thirty [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 4.00%      
Notes payable $ 498.8     497.9
Senior Note Member Thirty-One [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 2.55% 2.55%    
Notes payable $ 397.9     0.0
Senior Note Member Twenty Five [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 4.375%      
Notes payable $ 348.4     348.1
Senior Note Twenty Seven [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 4.75%      
Notes payable $ 298.7     298.4
SeniorNoteTwentyEight [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 5.75%      
Notes payable $ 398.0     397.6
Senior Note Member Forty [Member] | Forestar Consolidated [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Notes payable $ 119.9      
Senior Note Member Forty [Member] | Forestar Group [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Senior notes, stated interest rate 3.75%   3.75%  
Secured Debt [Member] | Homebuilding [Member]        
Summary of notes payable at principal amounts, net of unamortized discounts        
Notes payable $ 4.5     $ 11.1