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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Unamortized debt issuance costs $ 33.6  
Senior Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt issuance costs $ 25.9 $ 29.3