Debt and Capital Lease Obligations (Capital Lease Obligations) (Schedule) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Debt Instrument [Line Items]
2014 (remainder of year)	$ 94.2
2015	300.0
2016	249.8
2017	199.7
2018	165.7
2019	150.0
Thereafter	1,511.1
Total principal and interest payments	2,670.5
Amounts representing interest	(1,021.5)
Present value of net minimum lease payments	1,649.0
Current portion	215.9
Noncurrent portion	1,433.1
UnityMedia KabelBW [Member]
Debt Instrument [Line Items]
2014 (remainder of year)	23.1
2015	92.6
2016	92.6
2017	92.6
2018	92.6
2019	92.6
Thereafter	1,008.1
Total principal and interest payments	1,494.2
Amounts representing interest	(641.9)
Present value of net minimum lease payments	852.3
Current portion	27.7
Noncurrent portion	824.6
Telenet [Member]
Debt Instrument [Line Items]
2014 (remainder of year)	19.3
2015	66.5
2016	66.1
2017	64.3
2018	60.8
2019	50.0
Thereafter	248.9
Total principal and interest payments	575.9
Amounts representing interest	(148.9)
Present value of net minimum lease payments	427.0
Current portion	42.3
Noncurrent portion	384.7
Virgin Media [Member]
Debt Instrument [Line Items]
2014 (remainder of year)	41.9
2015	123.3
2016	71.9
2017	30.4
2018	6.9
2019	4.6
Thereafter	231.3
Total principal and interest payments	510.3
Amounts representing interest	(211.4)
Present value of net minimum lease payments	298.9
Current portion	127.7
Noncurrent portion	171.2
Other Subsidiaries [Member]
Debt Instrument [Line Items]
2014 (remainder of year)	9.9
2015	17.6
2016	19.2
2017	12.4
2018	5.4
2019	2.8
Thereafter	22.8
Total principal and interest payments	90.1
Amounts representing interest	(19.3)
Present value of net minimum lease payments	70.8
Current portion	18.2
Noncurrent portion	$ 52.6