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Level 4 Transactions With Related Party (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Related Party Transaction [Line Items]        
Treasury Stock, Shares, Acquired     3,864,062  
Treasury Stock, Value, Acquired, Cost Method     $ 100.0  
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 5.0 5.3 16.5 14.7
Fiber Costs from Related Parties $ 18.1 $ 14.1 $ 50.7 $ 44.7