Financing Activities (Details) - Revolving Credit Facility [Member] $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Covenant Terms	five year term
Line of Credit Facility, Maximum Borrowing Capacity	$ 850.0
Line of Credit Facility, Borrowing Capacity, Description	The Company may borrow cash and may obtain letters of credit in multiple currencies under this facility.