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Derivative Instruments (Realized and Unrealized Gains (Losses) on Derivatives) (Schedule and Footnotes) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Derivative [Line Items] |  |
Gain (loss) on derivative instruments, net | $ 811.1 | $ 1,237.3
Cross-currency and interest rate derivative contracts |  |
Derivative [Line Items] |  |
Gain (loss) on derivative instruments, net | 784.6 | 842.3
Equity-related derivative instruments: |  |
Derivative [Line Items] |  |
Gain (loss) on derivative instruments, net | 24.5 | 390.4
ITV Collar |  |
Derivative [Line Items] |  |
Gain (loss) on derivative instruments, net | (10.6) | 383.4
Other |  |
Derivative [Line Items] |  |
Gain (loss) on derivative instruments, net | 35.1 | 7.0
Foreign currency forward and option contracts |  |
Derivative [Line Items] |  |
Gain (loss) on derivative instruments, net | 2.1 | 5.7
Other |  |
Derivative [Line Items] |  |
Gain (loss) on derivative instruments, net | $ (0.1) | $ (1.1)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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