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Debt (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Jul. 29, 2016
Jun. 01, 2016
Feb. 01, 2016
Debt Instrument                  
debt issuance cost adoption reclassification     $ (10,264,000)            
Long-term debt, maturities, repayments of principal, year one     123,000,000            
Long-term debt, maturities, repayments of principal, year two     0            
Long-term debt, maturities, repayments of principal, year three through five     700,000,000            
Long-term debt, maturities, repayments of principal, thereafter     2,300,000,000            
Senior notes     3,110,016,000 $ 1,576,082,000          
Term loan     500,000,000            
Extinguishment of debt, amount     965,200,000 238,000,000 $ 245,700,000        
Loss on debt retirements     657,000 0 $ 8,584,000        
Letters of credit outstanding, amount     219,100,000 191,300,000          
Unused credit lines     530,900,000 308,700,000          
Notes Payable     $ 19,282,000 35,336,000          
Debt Instrument, Term     4 years            
Financial Services debt     $ 331,621,000 $ 267,877,000          
Maximum [Member]                  
Debt Instrument                  
Debt instrument, interest rate, stated percentage     5.00%            
Unsecured Senior Notes 6.50% due May 2016 [Member]                  
Debt Instrument                  
Debt instrument, interest rate, stated percentage     6.50% 6.50%          
Senior notes     $ 0 $ 465,245,000          
Unsecured Letter Of Credit Facility [Member]                  
Debt Instrument                  
Letters of credit outstanding, amount     219,100,000 $ 191,300,000          
Revolving Credit Facility [Member]                  
Debt Instrument                  
Maximum borrowing capacity     500,000,000            
Short-term debt covenant description       375000          
Line of Credit, Current     $ 0            
Line of Credit Facility, Initiation Date     Jul. 23, 2014            
Line of Credit Facility, Expiration Date     Jun. 01, 2019            
Revolving Credit Facility Accordion Feature [Member]                  
Debt Instrument                  
Maximum borrowing capacity     $ 1,250,000,000.00            
Financial Services [Member]                  
Debt Instrument                  
Maximum borrowing capacity     360,000,000 $ 310,000,000          
Unused credit lines     $ 28,379,000 42,123,000          
Financial Services [Member] | Unsecured Letter Of Credit Facility [Member]                  
Debt Instrument                  
Line of Credit Facility, Expiration Date     Sep. 01, 2014            
Financial Services [Member] | Repurchase Agreement [Member]                  
Debt Instrument                  
Maximum borrowing capacity     $ 360,000,000         $ 750,000,000  
Financial Services debt     $ 331,600,000 267,900,000          
Line of Credit Facility, Initiation Date Jun. 01, 2015 Feb. 02, 2015 Sep. 08, 2014            
Line of Credit Facility, Expiration Date     Sep. 07, 2015            
Financial Services [Member] | Repurchase Agreement [Member] | Minimum [Member]                  
Debt Instrument                  
Maximum borrowing capacity     $ 175,000,000            
Financial Services [Member] | Repurchase Agreement [Member] | Maximum [Member]                  
Debt Instrument                  
Maximum borrowing capacity     200,000,000            
Senior Unsecured Notes February 2016 [Member] | Senior Notes [Member]                  
Debt Instrument                  
Debt Instrument, Face Amount                 $ 1,000,000,000
4.250% unsecured senior notes due March 2021 [Member] | Senior Notes [Member]                  
Debt Instrument                  
Debt Instrument, Face Amount             $ 400,000,000   300,000,000
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
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    
Senior Notes [Member] | 5.500% unsecured senior notes due March 2026 [Member]                  
Debt Instrument                  
Senior notes     700,000,000 0          
Senior Notes [Member] | Senior Unsecured Term Loan Maturing January 3, 2027 [Member] [Domain]                  
Debt Instrument                  
Debt instrument, interest rate, stated percentage             5.00%    
Senior notes     $ 600,000,000 $ 0