Business and Summary of Significant Accounting Principles (Intangible Assets and Goodwill) (Details)	12 Months Ended
	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	12 years 10 months 3 days
Other Intangible Assets | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	2 years
Other Intangible Assets | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	20 years