Segment Reporting (Reconciliation of Consolidated Segment Adjusted OIBDA) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Earnings (loss) from continuing operations	$ 315.6	$ (985.6)	$ 12,889.2	$ (502.2)
Income tax expense (benefit)	2.2	(165.5)	444.2	(252.2)
Other income, net	(8.2)	(5.4)	(25.6)	(67.4)
Share of results of affiliates, net	29.2	27.1	35.6	99.1
Losses on debt extinguishment, net	0.0	0.3	90.6	220.4
Realized and unrealized losses (gains) due to changes in fair values of certain investments and debt, net	109.4	21.5	(373.3)	399.0
Foreign currency transaction losses (gains), net	(422.4)	754.6	(857.6)	836.3
Realized and unrealized losses (gains) gains on derivative instruments, net	(199.3)	717.5	(707.4)	(200.4)
Interest expense	140.9	279.3	748.1	873.5
Operating income	101.0	643.8	1,239.4	1,406.1
Impairment, restructuring and other operating items, net	17.2	(16.7)	68.4	46.5
Depreciation and amortization	582.3	432.0	1,744.8	1,710.1
Share-based compensation expense	58.0	104.4	220.6	243.4
Adjusted EBITDA	758.5	1,163.5	3,273.2	3,406.1
Atlas Edge JV
Segment Reporting Information [Line Items]
Gain (adjustment to gain) on JV Transaction	(213.7)	0.0	(213.7)	0.0
U.K. JV Transaction
Segment Reporting Information [Line Items]
Gain (adjustment to gain) on JV Transaction	$ 347.3	$ 0.0	$ (10,790.7)	$ 0.0