Derivative Instruments (Realized and Unrealized Gains (Losses) on Derivatives) (Schedule and Footnotes) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Gain (loss) on derivative instruments, net	$ 199.3	$ (717.5)	$ 707.4	$ 200.4
Cross-currency and interest rate derivative contracts
Derivative [Line Items]
Gain (loss) on derivative instruments, net	170.9	(755.4)	658.0	(222.5)
Equity-related derivative instruments:
Derivative [Line Items]
Gain (loss) on derivative instruments, net	50.8	77.1	74.3	454.7
ITV Collar
Derivative [Line Items]
Gain (loss) on derivative instruments, net	0.0	82.9	(11.8)	433.2
Other
Derivative [Line Items]
Gain (loss) on derivative instruments, net	50.8	(5.8)	86.1	21.5
Foreign currency forward and option contracts
Derivative [Line Items]
Gain (loss) on derivative instruments, net	(22.4)	(39.2)	(27.1)	(31.8)
Other
Derivative [Line Items]
Gain (loss) on derivative instruments, net	$ 0.0	$ 0.0	$ 2.2	$ 0.0