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Debt (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Aug. 15, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 22, 2018
Jul. 29, 2016
Jun. 01, 2016
Feb. 01, 2016
Debt Instrument                
Notes payable $ 2,986,753,000   $ 2,986,943,000          
Term loan 500,000,000.0              
Loss on debt retirements 0   0 $ 657,000        
Repayments of Long-term Debt 82,775,000   134,747,000 $ 986,919,000        
Other Notes Payable $ 41,313,000   20,024,000          
Debt Instrument, Term 3 years              
Letters of credit outstanding, amount $ 239,400,000   235,500,000          
Unused credit lines 760,600,000   764,500,000          
Financial Services debt $ 348,412,000   437,804,000          
Maximum                
Debt Instrument                
Debt instrument, interest rate, stated percentage 7.57%              
Unsecured Senior Notes 6.50% due May 2016 [Member]                
Debt Instrument                
Notes payable             $ 465,200,000  
Unsecured Letter Of Credit Facility [Member]                
Debt Instrument                
Letters of credit outstanding, amount $ 239,400,000   235,500,000          
Revolving Credit Facility [Member]                
Debt Instrument                
Short-term debt covenant description 500,000,000.0              
Line of Credit, Current $ 0              
Line of Credit Facility, Initiation Date Jun. 22, 2018              
Line of Credit Facility, Expiration Date Jun. 22, 2023              
Revolving Credit Facility Accordion Feature [Member]                
Debt Instrument                
Maximum borrowing capacity         $ 1,500,000,000      
Financial Services [Member]                
Debt Instrument                
Maximum borrowing capacity $ 520,000,000   475,000,000          
Unused credit lines 171,588,000   37,196,000          
Financial Services [Member] | Unsecured Letter Of Credit Facility [Member]                
Debt Instrument                
Line of Credit Facility, Expiration Date   Aug. 02, 2019            
Financial Services [Member] | Repurchase Agreement [Member]                
Debt Instrument                
Maximum borrowing capacity 520,000,000.0       $ 1,000,000,000.0      
Financial Services debt 348,400,000   437,800,000          
Financial Services [Member] | Repurchase Agreement [Member] | Minimum                
Debt Instrument                
Maximum borrowing capacity 240,000,000.0              
Financial Services [Member] | Repurchase Agreement [Member] | Maximum                
Debt Instrument                
Maximum borrowing capacity 400,000,000.0              
Senior Unsecured Notes February 2016 [Member] | Senior Notes [Member]                
Debt Instrument                
Debt Instrument, Face Amount               $ 1,000,000,000.0
4.250% unsecured senior notes due March 2021 [Member] | Senior Notes [Member]                
Debt Instrument                
Debt Instrument, Face Amount           $ 400,000,000.0   300,000,000.0
Debt instrument, interest rate, stated percentage           4.25%    
5.500% unsecured senior notes due March 2026 [Member] | Senior Notes [Member]                
Debt Instrument                
Debt Instrument, Face Amount               $ 700,000,000.0
Debt instrument, interest rate, stated percentage           5.50%    
Senior Unsecured Notes, Issued July 2016 [Member] | Senior Notes [Member]                
Debt Instrument                
Debt Instrument, Face Amount           $ 1,000,000,000.0    
Senior Notes [Member] | 5.500% unsecured senior notes due March 2026 [Member]                
Debt Instrument                
Notes payable 700,000,000   700,000,000          
Senior Notes [Member] | Senior Unsecured Term Loan Maturing January 3, 2027 [Member] [Domain]                
Debt Instrument                
Debt instrument, interest rate, stated percentage           5.00%    
Notes payable $ 600,000,000.0   $ 600,000,000