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Subsequent Event (Details)
Feb. 01, 2016
USD ($)
Feb. 17, 2012
USD ($)
Line of Credit Facility [Line Items]    
Line of credit facility, increase limit   $ 250,000,000
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit    
Line of Credit Facility [Line Items]    
Debt instrument term 5 years  
Unsecured revolving credit facility $ 1,500,000,000.0  
Debt to EBITDA ratio (not greater than) 3.25  
EBITDA to interest payable ratio (not less than) 3.00  
Periodic principal payment percentage 2.50%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Term Loan    
Line of Credit Facility [Line Items]    
Unsecured term loan $ 500,000,000  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Term Loan | Base Rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.125%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Term Loan | Base Rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.875%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Term Loan | LIBOR | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.125%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Term Loan | LIBOR | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.875%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Unsecured revolving credit facility $ 1,000,000,000  
Line of credit facility, increase limit $ 750,000,000  
Unsecured revolving credit facility extension 2  
Long-term line of credit, outstanding $ 250,000,000  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Revolving Credit Facility | Base Rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.00%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Revolving Credit Facility | Base Rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.50%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Revolving Credit Facility | LIBOR | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.90%  
February 1, 2016 Credit Agreement | Subsequent event | Line of Credit | Revolving Credit Facility | LIBOR | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.50%