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Debt (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2016
Jul. 29, 2016
Feb. 29, 2016
Jan. 19, 2016
Dec. 31, 2015
Dec. 01, 2015
Debt Instrument [Line Items]            
Senior notes $ 2,103,821,000       $ 1,576,082,000  
Letters of credit outstanding 227,200,000       191,300,000  
Notes payable $ 17,200,000       35,300,000  
Debt instrument term 4 years          
Amount outstanding $ 189,557,000       267,877,000  
Unsecured Senior Notes 6.50% due May 2016            
Debt Instrument [Line Items]            
Senior notes [1] $ 0       $ 465,245,000  
Stated interest rate 6.50%       6.50%  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Current borrowing capacity $ 500,000,000          
Maximum borrowing capacity 750,000,000          
Maximum additional issuance 375,000,000          
Fair value of amount outstanding 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       $ 175,000,000.0   $ 310,000,000
Amount outstanding $ 189,600,000       $ 267,900,000  
Maximum            
Debt Instrument [Line Items]            
Stated interest rate 5.00%          
Senior Unsecured Notes February 2016 | Senior Notes            
Debt Instrument [Line Items]            
Debt issuance amount     $ 1,000,000,000      
Senior Unsecured Term Loan Maturing January 3, 2017 | Senior Loans            
Debt Instrument [Line Items]            
Debt issuance amount $ 500,000,000.0          
Scenario, Forecast | Repurchase Agreement | Financial Services            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 200,000,000.0        
[1] Redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.