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Long-term Debt and Other Financing (Details2) (USD $)
6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Revolving Credit Facility [Member]
     
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 1,100,000,000.0  
Line of Credit Facility, Expiration Date Mar. 31, 2019    
Minimum amount of borrowing capacity for a fixed charge coverage ratio applies 110,000,000    
Line of Credit Facility, Current Borrowing Capacity 1,100,000,000    
Outstanding borrowings on revolving credit facility 530,000,000   90,000,000
Letters of credit, outstanding 67,500,000    
Line of credit facility, remaining borrowing capacity 502,500,000    
Replaced Credit Facility [Member]
     
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 1,100,000,000.0  
Line of Credit Facility, Expiration Date Apr. 28, 2016