Business and Summary of Significant Accounting Principles (Accounts Receivable and Allowance for Doubtful Receivables) (Details)	12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]
Past due period	120 days

Threshold period past due for trade accounts receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_ThresholdPeriodPastDueForWriteoffOfTradeAccountsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration