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Long-Term Debt Foreign Credit Facilities (Narrative) (Details) - Foreign Credit Facilities [Member] - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Line of credit facility, amount outstanding $ 53.2 $ 60.4
Foreign Credit Facilities, Remaining Borrowing Capacity $ 159.7 $ 62.0