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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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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

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