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Long-Term Debt (Details 2) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Carrying Value    
Carrying values and estimated fair values of outstanding debt    
Total debt $ 75.9 $ 82.7
Fair Value | Significant Other Observable Inputs (Level 2)    
Carrying values and estimated fair values of outstanding debt    
Total debt $ 75.9 $ 82.7