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Derivative Instruments (Realized and Unrealized Gains (Losses) on Derivatives) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | $ (192.0) | $ 1,125.8 | $ (1,052.8)
Cross-currency and interest rate derivative contracts |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | (207.3) | 905.8 | (1,145.6)
ITV Collar |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | (84.4) | 176.7 | 215.0
Lionsgate Forward |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | 13.0 | 30.1 | (11.4)
Sumitomo Collar |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | 0.0 | (11.8) | (77.4)
Other |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | 8.0 | 2.5 | (3.9)
Total equity-related derivative instruments |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | (63.4) | 197.5 | 122.3
Foreign currency forward and option contracts |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | 77.4 | 22.7 | (30.2)
Other |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on derivative instruments, net | $ 1.3 | $ (0.2) | $ 0.7

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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=109980867&loc=SL5618551-113959 + Details
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