Debt and Capital Lease Obligations (VM Credit Facility) (Details)	12 Months Ended
	Dec. 31, 2013 VM Credit Facility [Member] USD ($)	Dec. 31, 2013 VM Credit Facility [Member] GBP (£)	Dec. 31, 2013 VM Credit Facility A [Member] USD ($)	Dec. 31, 2013 VM Credit Facility A [Member] GBP (£)	Dec. 31, 2013 VM Credit Facility B [Member] USD ($)	Dec. 31, 2013 VM Credit Facility B [Member] GBP (£)	Dec. 31, 2013 VM Credit Facility C [Member] USD ($)	Dec. 31, 2013 VM Credit Facility C [Member] GBP (£)	Dec. 31, 2013 VM Revolving Credit Facility [Member] USD ($)	Dec. 31, 2013 VM Revolving Credit Facility [Member] GBP (£)	Dec. 31, 2013 VM Credit Facility B and C [Member]
Debt Instrument [Line Items]
Facility amount			$ 621,300,000	£ 375,000,000	$ 2,755,000,000	£ 2,755,000,000	$ 994,000,000	£ 600,000,000	$ 1,093,400,000	£ 660,000,000
Unused borrowing capacity	1,093,400,000		0		0		0		1,093,400,000
Carrying value	4,352,800,000		621,200,000		2,742,200,000		989,400,000		0
Description of variable rate basis			LIBOR	LIBOR	LIBOR	LIBOR	LIBOR	LIBOR	LIBOR	LIBOR
Basis spread on variable rate			3.25%	3.25%	2.75%	2.75%	3.75%	3.75%	3.25%	3.25%
EBITDA Minimum Percentage	80.00%	80.00%
Minimum term after change in control lenders may cancel commitments	30 days	30 days
Portion of debt, default of which triggers event of default	82,800,000	50,000,000
Unused borrowing capacity considering limitations	1,082,800,000	653,600,000
Unused borrowing capacity, considering limitations, after compliance reporting requirements	$ 1,030,500,000	£ 622,000,000
Fee on unused portion of credit facility	1.30%	1.30%
LIBOR interest rate floor											0.75%