Derivative Instruments (Realized and Unrealized Gains (Losses) on Derivatives) (Schedule and Footnotes) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative [Line Items]
Gain (loss) on derivative instruments, net	$ (303.1)	$ (319.7)	$ 508.0	$ 917.6
Cross-currency and interest rate derivative contracts
Derivative [Line Items]
Gain (loss) on derivative instruments, net	(297.5)	(309.4)	487.1	532.9
Equity-related derivative instruments:
Derivative [Line Items]
Gain (loss) on derivative instruments, net	(1.0)	(12.8)	23.5	377.6
ITV Collar
Derivative [Line Items]
Gain (loss) on derivative instruments, net	(1.2)	(33.1)	(11.8)	350.3
Other
Derivative [Line Items]
Gain (loss) on derivative instruments, net	0.2	20.3	35.3	27.3
Foreign currency forward and option contracts
Derivative [Line Items]
Gain (loss) on derivative instruments, net	(6.8)	1.7	(4.7)	7.4
Other
Derivative [Line Items]
Gain (loss) on derivative instruments, net	$ 2.2	$ 0.8	$ 2.1	$ (0.3)