Gain Loss On Credit Risk Derivatives Net Recognized In Earnings

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Notional Amount of Derivative Instruments without Exchange of Notional Amounts at Inception and Maturity

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Shares Needed to Borrow from Custody Account to Hedge Exposure

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Balance held at close of period in number of shares.

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Market value of securities borrowed to the extent to which no equivalent value is paid or credited.

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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 22, 2018
Derivative [Line Items]
Gain (loss) on change in credit risk valuation included in realized and unrealized gains (losses) on derivative instruments, net	$ (71.1)	$ 168.4	$ 26.5
Assets - derivative instruments	2,496.7	2,127.7
Virgin Media
Derivative [Line Items]
Notional amount of derivative instruments without exchange of notional amounts at inception and maturity	4,700.0
Cross Currency Interest Rate Contract
Derivative [Line Items]
Assets - derivative instruments	1,742.8	$ 1,548.9
ITV Collar
Derivative [Line Items]
Derivative asset fair value	$ 704.0
Number of common stock shares owned (in shares)	398,515,510
Shares needed to borrow from custody account to hedge exposure (in shares)	400,000,000
Sumitomo Collar
Derivative [Line Items]
Aggregate market value of borrowed Sumitomo shares				$ 159.3
Lionsgate Loan \| Common Stock
Derivative [Line Items]
Number of common stock shares owned (in shares)	1,250,000
Lionsgate Loan \| Nonvoting Common Stock
Derivative [Line Items]
Number of common stock shares owned (in shares)	1,250,000
Lionsgate Forward
Derivative [Line Items]
Derivative asset fair value	$ 42.2
Counterparty Credit Risk
Derivative [Line Items]
Assets - derivative instruments	$ 617.3