Goodwill and Other Intangible Assets -Weighted Average Lives (Details)	12 Months Ended
	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	17 years
Customer lists and advertiser relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	10 years
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	23 years
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	13 years