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Non-Operating Expense	12 Months Ended
Non-Operating Expense	Dec. 31, 2017
Other Income And Expenses [Abstract]
Non-Operating Expense	Note 18 — Non-operating Expense In June 2016, the Company amended and extended our $700 million senior unsecured revolving credit facility that now matures in June 2021. As a result of this amendment, we accelerated certain unamortized costs of the credit facility being replaced incurring a pretax charge of $0.4 million.