Lines of Credit and Financing Arrangements (Credit Facility Ratios) (Details) - Revolving Credit Facility [Member]	6 Months Ended
Jun. 30, 2018
Maximum [Member]
Line of Credit Facility [Line Items]
Consolidated Indebtedness to Adjusted EBITDA Ratio no greater than	3.5
Minimum [Member]
Line of Credit Facility [Line Items]
Cash Flow to Net Interest Expense Ratio no less than	3.0

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