Derivative Instruments (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	May 22, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative assets	$ 3,570.7		$ 3,570.7			$ 2,506.1
VM Convertible Senior Notes [Member]
Derivative [Line Items]
Interest rate	6.50%		6.50%
Sumitomo Share Loan [Member]
Derivative [Line Items]
Securities borrowed					$ 91.4
Cross-currency and interest rate derivative contracts
Derivative [Line Items]
Valuation adjustment in asset cross currency and interest rate derivative contracts	$ 127.1		$ 127.1			64.0
Valuation adjustment in liability cross currency and interest rate derivative contracts	160.4		160.4			86.5
Gain (loss) in changes in the credit risk valuation adjustments associated with our cross-currency and interest rate derivative contracts	(14.3)	$ 77.2	7.1	$ 60.3
Derivative assets	$ 2,579.0		$ 2,579.0			$ 2,085.6
Lionsgate Forward [Member]
Derivative [Line Items]
Number of common stock shares owned (in shares)	2.5		2.5
Counterparty Credit Risk [Member]
Derivative [Line Items]
Derivative assets	$ 2,441.3		$ 2,441.3