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Fair Value Measurements (Details Textual) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative Liability, Fixed Rate Debt, Carrying Value $ 479.2 $ 505.6
Derivative Liability, Fixed Rate Debt, Fair Value 479.6 516.5
Derivative Liability, Variable Rate Debt, Fair Value $ 166.0 $ 14.0