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Derivative Instruments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) tranche shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | May 22, 2018 USD ($)
Derivative [Line Items] |  |  |  |  |
Gain (loss) on change in credit risk valuation included in realized and unrealized gains (losses) on derivative instruments, net |  | $ 16.6 | $ (71.1) | $ 168.4 |
Assets - derivative instruments |  | 1,827.5 | 2,496.7 |  |
Principal borrowing outstanding |  | 1,582.7 | $ 1,370.7 |  |
Virgin Media |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivative instruments without exchange of notional amounts at inception and maturity |  | 3,400.0 |  |  |
Sumitomo Collar |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Aggregate market value of borrowed shares |  |  |  |  | $ 159.3
Counterparty Credit Risk |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Assets - derivative instruments |  | $ 253.2 |  |  |
ITV Collar |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of common stock shares owned (in shares) | shares |  | 398,515,510 |  |  |
Shares needed to borrow from custody account to hedge exposure (in shares) | shares |  | 390,000,000 |  |  |
Derivative asset fair value |  | $ 619.6 |  |  |
Principal borrowing outstanding |  | 1,435.5 |  |  |
Lionsgate Loan |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Principal borrowing outstanding | $ 27.6 | $ 55.3 |  |  |
Lionsgate Loan | Common Stock |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of common stock shares owned (in shares) | shares | 833,334 | 1,250,000 |  |  |
Derivative asset fair value |  | $ 37.2 |  |  |
Lionsgate Loan | Nonvoting Common Stock |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of common stock shares owned (in shares) | shares | 833,333 | 1,250,000 |  |  |
Lionsgate Forward |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset fair value | $ 18.1 |  |  |  |
Number of tranches settled | tranche | 25 |  |  |  |

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