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Debt (Revolving Credit Facility Under The Senior Credit Agreement) (Narrative) (Details) (USD $)
9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Subsequent Event [Member]
Feb. 07, 2014
Revolving Credit Facility [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Feb. 07, 2014
2014 Term Loan [Member]
Feb. 07, 2014
2014 Term Loan [Member]
Eurodollar [Member]
Feb. 07, 2014
2014 Term Loan [Member]
Base Rate [Member]
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Minimum [Member]
Eurodollar [Member]
Sep. 30, 2014
Minimum [Member]
Base Rate [Member]
Sep. 30, 2014
Minimum [Member]
Revolving Credit Facility [Member]
Sep. 30, 2014
Maximum [Member]
Sep. 30, 2014
Maximum [Member]
Eurodollar [Member]
Sep. 30, 2014
Maximum [Member]
Base Rate [Member]
Sep. 30, 2014
Maximum [Member]
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]                                  
Line of credit facility, maximum borrowing capacity         $ 770,000,000 $ 770,000,000                      
Basis spread on variable interest rate               2.50% 1.50% 1.875% 1.875% 0.875%   2.375% 2.375% 1.375%  
Line of credit facility, commitment fee                         0.375%       0.50%
Borrowings on the revolving credit facility         300,000,000 575,000,000                      
Repayments of revolving credit facility 490,000,000 225,000,000 300,000,000 390,000,000 100,000,000 490,000,000                      
Line of credit facility, outstanding         300,000,000 300,000,000                      
Line of credit facility, remaining borrowing capacity         770,000,000 770,000,000                      
Debt instrument, face amount             $ 1,500,000,000                    
Revolving credit facility, effective interest rate         2.535% 2.535%