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Fair Value (Narrative) (Details) - Senior Notes - Level 2
$ in Millions
Sep. 30, 2015
USD ($)
Senior Unsecured Notes due 2019  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Estimated fair value of senior unsecured notes $ 350.0
Senior Unsecured Notes due 2021  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Estimated fair value of senior unsecured notes $ 300.0