Lines of Credit and Financing Arrangements (Weighted Average Borrowing Rate) (Details)	Mar. 31, 2018	Dec. 31, 2017
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Weighted average borrowing rate	3.03%	2.76%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration