Segment Reporting (Reconciliation of Consolidated Segment Adjusted OIBDA) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Measurement Disclosures [Abstract]
Adjusted OIBDA from continuing operations	$ 1,294.1	$ 1,251.4	$ 3,875.7	$ 3,553.2
Share-based compensation expense	(42.8)	(21.5)	(131.0)	(101.8)
Depreciation and amortization	(935.3)	(953.7)	(2,952.8)	(2,743.4)
Impairment, restructuring and other operating items, net	(107.4)	(54.6)	(199.0)	(61.0)
Operating income	208.6	221.6	592.9	647.0
Interest expense	(363.6)	(360.0)	(1,120.6)	(1,048.3)
Realized and unrealized gains (losses) on derivative instruments, net	65.5	(187.4)	529.7	(783.5)
Foreign currency transaction gains (losses), net	96.5	(159.3)	46.9	(148.3)
Realized and unrealized gains (losses) due to changes in fair values of certain investments and debt, net	(99.6)	39.6	(95.3)	(3.0)
Losses on debt modification and extinguishment, net	(27.7)	(37.3)	(50.4)	(136.2)
Share of results of affiliates, net	(11.1)	(26.8)	(129.9)	(46.1)
Other income, net	16.0	9.5	32.2	41.9
Loss from continuing operations before income taxes	$ (115.4)	$ (500.1)	$ (194.5)	$ (1,476.5)