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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Feb. 29, 2016
Debt Instrument [Line Items]      
Joint venture debt with limited recourse guaranties $ 52,500,000    
Letters of credit outstanding 226,900,000 $ 219,100,000  
Notes payable $ 20,000,000 19,300,000  
Debt instrument term 4 years    
Amount outstanding $ 140,381,000 331,621,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity 750,000,000.0    
Maximum additional issuance 375,000,000    
Fair value of amount outstanding 0 0  
Revolving Credit Facility Accordion Feature      
Debt Instrument [Line Items]      
Maximum borrowing capacity 1,250,000,000.00    
Repurchase Agreement | Financial Services      
Debt Instrument [Line Items]      
Maximum borrowing capacity 200,000,000.0    
Amount outstanding $ 140,400,000 331,600,000  
Maximum      
Debt Instrument [Line Items]      
Stated interest rate 5.00%    
Minimum | Repurchase Agreement | Financial Services      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 175,000,000.0    
Senior Notes | Senior Unsecured Notes February 2016      
Debt Instrument [Line Items]      
Face amount     $ 1,000,000,000
Senior Notes | 4.250% unsecured senior notes due March 2021      
Debt Instrument [Line Items]      
Face amount $ 700,000,000 $ 700,000,000 $ 300,000,000
Stated interest rate 4.25% 4.25% 4.25%
Senior Notes | 5.500% unsecured senior notes due March 2026      
Debt Instrument [Line Items]      
Face amount $ 700,000,000 $ 700,000,000  
Stated interest rate 5.50% 5.50%  
Senior Notes | 5.000% unsecured senior notes due January 2027      
Debt Instrument [Line Items]      
Face amount $ 600,000,000 $ 600,000,000  
Stated interest rate 5.00% 5.00%  
Unconsolidated Joint Ventures [Member]      
Debt Instrument [Line Items]      
Equity method investment, ownership percentage 50.00%