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Fair Value (Details Textual) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value $ 1,157.2 $ 1,077.5
Long-term Fixed-rate Debt, Carrying Value $ 1,062.6 $ 1,070.7