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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Business (Textual) [Abstract]    
Interest in subsidiary (less than given percentage) 100.00%  
Accumulated depreciation $ 1,246.4 $ 1,118.3