Derivative Instruments (Narrative) (Details) £ in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) installment shares	Dec. 31, 2013 shares	Dec. 31, 2015 USD ($)	Nov. 30, 2015 USD ($)	Jul. 31, 2015 USD ($)	Jul. 31, 2014 GBP (£)
Derivative [Line Items]
Fair value derivative assets, counterparty credit risk exposure		$ 2,424.6
Liabilities - derivative instruments		$ 1,309.9		$ 1,594.6
Stated interest rate of debt		4.875%
Initial ITV Investment [Member]
Derivative [Line Items]
Original issue amount	$ 764.5						£ 446.9
Ziggo Collar [Member] | Put Options Purchased [Member]
Derivative [Line Items]
Number of options | shares			24,957,000
ITV Collar [Member]
Derivative [Line Items]
Discount rate	0.00%
Implied yield	1.39%						1.39%
Number of common stock shares owned (in shares) | shares		398,515,510
Original issue amount						$ 92.0
Shares needed to borrow from custody account to hedge exposure | shares		390,000,000
Liabilities - derivative instruments						270.5
Sumitomo Collar fair value		$ 311.9
Additional ITV Investment [Member]
Derivative [Line Items]
Original issue amount						77.5
ITV Collar Loan Modifications [Member]
Derivative [Line Items]
Original issue amount						$ 14.5
Sumitomo Collar [Member]
Derivative [Line Items]
Number of common stock shares owned (in shares) | shares		27,391,305
Percent of shares held that are hedged		60.00%
Number of equal semi-annual installments | installment		5
Sumitomo Collar fair value		$ 179.9
Stated interest rate of debt		1.883%
Sumitomo Share Loan [Member]
Derivative [Line Items]
Percent of shares held that are hedged		40.00%
Stated interest rate of debt		1.10%
Sumitomo Share Loan and Collar [Member]
Derivative [Line Items]
Percent of shares held that are hedged		100.00%
Lionsgate Forward [Member]
Derivative [Line Items]
Discount rate		0.00%
Implied yield		3.50%
Number of common stock shares owned (in shares) | shares		2,500,000
Original issue amount					$ 69.7
Shares needed to borrow from custody account to hedge exposure | shares		1,700,000
Sumitomo Collar fair value		$ 23.6
Virgin Media Capped Call [Member]
Derivative [Line Items]
Stated interest rate of debt				6.50%
Percentage of notional amount settled			93.80%
Proceeds from settlement of derivative instrument		$ 36.2