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Level 4 Transactions With Related Party (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity Method Investee [Member]
       
Related Party Transaction [Line Items]        
Variable Interest Entity Ownership Percentage     50.00%  
Co-venturer [Member]
       
Related Party Transaction [Line Items]        
Variable Interest Entity Ownership Percentage     50.00%  
Revenue from Related Parties $ 7.1 $ 5.3 $ 14.3 $ 11.5
Fiber Costs from Related Parties $ 18.9 $ 16.8 $ 35.0 $ 32.5