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Debt (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2016
Aug. 15, 2016
Jul. 01, 2016
Feb. 29, 2016
Dec. 31, 2015
Debt Instrument [Line Items]          
Repayments of debt $ 500,000,000        
Write off of debt issuance cost 700,000        
Letters of credit outstanding 245,700,000       $ 191,300,000
Notes payable $ 20,500,000       35,300,000
Debt instrument term 4 years        
Amount outstanding $ 158,794,000       267,877,000
Revolving Credit Facility          
Debt Instrument [Line Items]          
Current borrowing capacity 500,000,000.0        
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 300,000,000.0 $ 175,000,000.0      
Amount outstanding $ 158,800,000       267,900,000
Maximum          
Debt Instrument [Line Items]          
Stated interest rate 5.00%        
Maximum | Repurchase Agreement | Financial Services          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 200,000,000.0        
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   $ 400,000,000 $ 300,000,000 $ 0
Stated interest rate 4.25%   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       $ 0
Stated interest rate 5.50%       5.50%
Senior Notes | 6.500% unsecured senior notes due May 2016          
Debt Instrument [Line Items]          
Face amount $ 0       $ 465,245,000
Stated interest rate 6.50%       6.50%
Senior Notes | Senior Unsecured Notes, Issued July 2016          
Debt Instrument [Line Items]          
Face amount     $ 1,000,000,000.0    
Senior Notes | 5.000% unsecured senior notes due January 2027          
Debt Instrument [Line Items]          
Face amount $ 600,000,000       $ 0
Stated interest rate 5.00%       5.00%