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Homebuilding Senior Notes And Other Debts Payable (Schedule of Senior and Convertible Senior Notes) (Details) - Homebuilding - USD ($)
1 Months Ended
Nov. 30, 2017
Apr. 30, 2015
Nov. 30, 2024
Nov. 30, 2020
Feb. 12, 2018
Debt Instrument [Line Items]          
Interest rate     7.50%    
Senior Notes | 4.500% senior notes due 2024          
Debt Instrument [Line Items]          
Interest rate     4.50%    
Senior Notes | 4.75% senior notes due 2025          
Debt Instrument [Line Items]          
Principal Amount   $ 500,000,000      
Net Proceeds   $ 495,528,000      
Price   100.00%      
Interest rate     4.75%    
Senior Notes | 5.25% senior notes due 2026          
Debt Instrument [Line Items]          
Principal Amount         $ 400,000,000
Interest rate     5.25%    
Senior Notes | 5.00% senior notes due 2027          
Debt Instrument [Line Items]          
Principal Amount         $ 350,000,000
Interest rate     5.00%    
Senior Notes | 4.75% senior notes due 2027 (1)          
Debt Instrument [Line Items]          
Principal Amount     $ 700,000,000 $ 900,000,000  
Net Proceeds $ 894,650,000        
Price       100.00%  
Interest rate     4.75%