Segment Reporting (Reconciliation of Consolidated Segment Adjusted OIBDA) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Measurement Disclosures [Abstract]
Adjusted OIBDA from continuing operations	$ 1,190.7	$ 1,303.5	$ 2,374.0	$ 2,565.2
Share-based compensation expense	(87.0)	(45.5)	(154.3)	(88.2)
Depreciation and amortization	(921.8)	(964.0)	(1,861.4)	(2,004.7)
Impairment, restructuring and other operating items, net	(33.2)	(29.9)	(104.1)	(90.6)
Operating income	148.7	264.1	254.2	381.7
Interest expense	(363.6)	(380.4)	(730.9)	(755.7)
Realized and unrealized gains on derivative instruments, net	152.9	675.5	70.1	464.2
Foreign currency transaction gains (losses), net	(27.0)	51.5	111.6	(50.2)
Realized and unrealized gains (losses) due to changes in fair values of certain investments and debt, net	(138.7)	61.5	(146.9)	4.3
Losses on debt modification and extinguishment, net (note 9)	(48.3)	(20.1)	(48.8)	(22.7)
Share of results of affiliates, net	(69.3)	(82.3)	(140.2)	(118.8)
Other income, net (note 4)	32.5	6.4	39.0	16.2
Earnings (loss) from continuing operations before income taxes	$ (312.8)	$ 576.2	$ (591.9)	$ (81.0)