Debt and Capital Lease Obligations (VM Notes) (Details)	Mar. 14, 2014 VM Dollar Senior Secured Notes, 2025 [Member] USD ($)	Mar. 14, 2014 VM Sterling Senior Secured Notes, 2025 [Member] USD ($)	Mar. 14, 2014 VM Sterling Senior Secured Notes, 2025 [Member] GBP (£)	Mar. 14, 2014 Original 2029 VM Senior Secured Notes [Member] USD ($)	Mar. 14, 2014 Original 2029 VM Senior Secured Notes [Member] GBP (£)	Mar. 14, 2014 VM Sterling Senior Secured Notes, 2018 [Member] USD ($)	Mar. 14, 2014 VM Sterling Senior Secured Notes, 2018 [Member] GBP (£)	Mar. 31, 2014 VM Senior Notes [Member] USD ($)	Mar. 31, 2014 VM Senior Notes [Member] GBP (£)	Mar. 31, 2014 VM Senior Secured Notes, 2025 [Member]	Mar. 31, 2014 VM Senior Secured Notes, 2029 [Member]	Apr. 02, 2014 Subsequent Event [Member] Original 2029 VM Senior Secured Notes [Member]	Apr. 02, 2014 Subsequent Event [Member] Additional 2029 VM Senior Secured Notes [Member] USD ($)	Apr. 02, 2014 Subsequent Event [Member] Additional 2029 VM Senior Secured Notes [Member] GBP (£)	Apr. 02, 2014 Subsequent Event [Member] Senior Secured Notes Due 2018 [Member] USD ($)
Debt Instrument [Line Items]
Interest rate	5.50%	5.50%	5.50%	6.25%	6.25%	7.00%	7.00%					6.25%			6.50%
Principal amount of debt	$ 425,000,000	$ 717,300,000	£ 430,000,000	$ 375,300,000	£ 225,000,000	$ 1,459,500,000	£ 875,000,000						$ 291,900,000	£ 175,000,000	$ 1,000,000,000
Issue price percent												101.75%
Debt acceleration covenant threshold for event of default								$ 83,400,000	£ 50,000,000
Additional basis points used to determine redemption premium										0.50%	0.50%
2019										102.75%
2020										101.833%
2021										100.00%	103.125%
2022										100.00%	102.083%
2023										100.00%	101.042%
2024										100.00%	100.00%