Long-lived Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill beginning balance	$ 23,748.8us-gaap_Goodwill	$ 13,877.6us-gaap_Goodwill
Acquisitions and related adjustments	7,737.0us-gaap_GoodwillAcquiredDuringPeriod	9,078.6us-gaap_GoodwillAcquiredDuringPeriod
Reclassification of Chellomedia Disposal Group to discontinued operations		(223.4)us-gaap_GoodwillOtherChanges
Foreign currency translation adjustments and other	(2,484.2)	1,016.0
Goodwill ending balance	29,001.6us-gaap_Goodwill	23,748.8us-gaap_Goodwill
European Operations Division U.K / Ireland [Member]
Goodwill [Line Items]
Goodwill beginning balance	9,844.2	235.5
Acquisitions and related adjustments	2.1	9,000.8
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(601.2)	607.9
Goodwill ending balance	9,245.1	9,844.2
European Operations Division Germany [Member]
Goodwill [Line Items]
Goodwill beginning balance	3,939.4	3,770.3
Acquisitions and related adjustments	0	0
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(482.5)	169.1
Goodwill ending balance	3,456.9	3,939.4
European Operations Division Belgium [Member]
Goodwill [Line Items]
Goodwill beginning balance	2,255.1	2,158.3
Acquisitions and related adjustments	0	0
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(276.2)	96.8
Goodwill ending balance	1,978.9	2,255.1
European Operations Division The Netherlands [Member]
Goodwill [Line Items]
Goodwill beginning balance	1,260.4	1,206.2
Acquisitions and related adjustments	7,724.3	0
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(379.7)	54.2
Goodwill ending balance	8,605.0	1,260.4
European Operations Division Switzerland / Austria [Member]
Goodwill [Line Items]
Goodwill beginning balance	4,031.1	3,903.9
Acquisitions and related adjustments	2.3	0.6
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(441.5)	126.6
Goodwill ending balance	3,591.9	4,031.1
European Operations Division Total Western Europe [Member]
Goodwill [Line Items]
Goodwill beginning balance	21,330.2	11,274.2
Acquisitions and related adjustments	7,728.7	9,001.4
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(2,181.1)	1,054.6
Goodwill ending balance	26,877.8	21,330.2
European Operations Division Central and Eastern Europe [Member]
Goodwill [Line Items]
Goodwill beginning balance	1,520.1	1,509.5
Acquisitions and related adjustments	8.3	0
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(226.3)	10.6
Goodwill ending balance	1,302.1	1,520.1
Total European Operations Division [Member]
Goodwill [Line Items]
Goodwill beginning balance	22,850.3	12,783.7
Acquisitions and related adjustments	7,737.0	9,001.4
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(2,407.4)	1,065.2
Goodwill ending balance	28,179.9	22,850.3
Chile [Member]
Goodwill [Line Items]
Goodwill beginning balance	508.5	558.0
Acquisitions and related adjustments	0	0
Reclassification of Chellomedia Disposal Group to discontinued operations		0
Foreign currency translation adjustments and other	(68.2)	(49.5)
Goodwill ending balance	440.3	508.5
Corporate and Other [Member]
Goodwill [Line Items]
Goodwill beginning balance	390.0	535.9
Acquisitions and related adjustments	0	77.2
Reclassification of Chellomedia Disposal Group to discontinued operations		(223.4)
Foreign currency translation adjustments and other	(8.6)	0.3
Goodwill ending balance	$ 381.4	$ 390.0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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