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Long-term Debt (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
May 05, 2014
Apr. 07, 2014
Debt Instrument [Line Items]      
Early Repayment of Senior Debt $ 200,000,000    
Senior Notes [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 1,000,000,000
Debt Instrument, Maturity Date Apr. 10, 2024    
Debt Instrument, Interest Rate, Stated Percentage   5.875% 3.60%
Senior Notes [Member] | Redemption Of Debt [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Nov. 21, 2033