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Debt (Narrative) (Details) (Senior Secured Revolving Credit Facility [Member], USD $)
3 Months Ended
Sep. 30, 2014
Oct. 24, 2014
Oct. 07, 2014
Apr. 10, 2014
Dec. 31, 2013
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 1,000,000,000        
Line of credit facility, current borrowing capacity 570,000,000 800,000,000 675,000,000 470,000,000  
Ratio of total debt to EBITDA 2.02        
Current ratio 1.68        
Line of credit facility amount outstanding 119,000,000       0
Debt, Weighted Average Interest Rate 2.01%        
Letters of credit outstanding amount $ 600,000        
Maximum [Member]
         
Debt Instrument [Line Items]          
Ratio of total debt to EBITDA 4.00        
Minimum [Member]
         
Debt Instrument [Line Items]          
Current ratio 1.00