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Debt Debt Retired and Issued (Details) - 22M [Member]
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]    
Long-term Debt, Gross   $ 22.0
Debt Instrument, Interest Rate, Stated Percentage 6.60% 6.60%
Debt Instrument, Maturity Date Mar. 01, 2018