Debt and Capital Lease Obligations (Unitymedia Notes) (Details) € in Millions, $ in Millions					6 Months Ended
	Mar. 30, 2015	Mar. 16, 2015 EUR (€)	Mar. 16, 2015 USD ($)	Mar. 11, 2015 USD ($)	Jun. 30, 2015 EUR (€)	Jun. 30, 2015 USD ($)	Mar. 16, 2015 USD ($)	Mar. 11, 2015 EUR (€)	Mar. 11, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Estimated fair value						$ 45,524.5				$ 46,151.1
Long-term Debt						44,624.9				44,611.4
Unitymedia Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt						7,441.0
Estimated fair value						7,698.7				7,869.3
Long-term Debt						7,441.0				$ 7,400.9
September 2012 UM Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 585.0	$ 652.4
Interest rate					5.50%	5.50%
Estimated fair value						$ 696.9
Long-term Debt						652.4
December 2012 UM Dollar Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt						$ 1,000.0
Interest rate					5.50%	5.50%
Estimated fair value						$ 1,019.4
Long-term Debt						1,000.0
December 2012 UM Euro Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 450.0	$ 501.9
Interest rate					5.75%	5.75%
Estimated fair value						$ 542.0
Long-term Debt						501.9
January 2013 UM Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 450.0	$ 501.9
Interest rate					5.125%	5.125%
Estimated fair value						$ 531.7
Long-term Debt						501.9
April 2013 UM Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 315.0	$ 351.3
Interest rate					5.625%	5.625%
Estimated fair value						$ 379.6
Long-term Debt						351.3
November 2013 UM Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 475.0	$ 529.8
Interest rate					6.25%	6.25%
Estimated fair value						$ 597.6
Long-term Debt						529.8
October 2014 UM Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt						$ 900.0
Interest rate					6.125%	6.125%
Estimated fair value						$ 940.5
Long-term Debt						900.0
December 2014 UM Euro Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 1,000.0	$ 1,115.3
Interest rate					4.00%	4.00%
Estimated fair value						$ 1,141.1
Long-term Debt						1,115.3
December 2014 UM Dollar Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt						$ 550.0
Interest rate					5.00%	5.00%
Estimated fair value						$ 546.6
Long-term Debt						550.0
March 2015 UM Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 700.0	$ 780.7
Interest rate					3.75%	3.75%
Estimated fair value						$ 756.8
Long-term Debt						780.7
March 2015 UM Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt					€ 500.0	$ 557.7
Interest rate					3.50%	3.50%
Estimated fair value						$ 546.5
Long-term Debt						$ 557.7
UM Senior Secured Notes Redeemed [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Percentage of principal amount redeemed				10.00%
Redemption price	103.00%			103.00%
Loss on debt modification and extinguishment				$ (8.1)
Payments for debt redemption premium				6.4
Write-off of deferred financing costs				$ 1.7
UM Senior Exchange Notes [Member] | Long-term Debt [Member]
Debt Instrument [Line Items]
Interest rate		9.50%					9.50%
Extinguishment of debt		€ 618.0	$ 689.3
Loss on debt modification and extinguishment			91.2
Payments for debt redemption premium			89.8
Write-off of unamortized debt discount (premium)			$ 1.4
Long-term Debt [Member] | March 2015 UM Senior Notes [Member] | 2021
Debt Instrument [Line Items]
Redemption price					101.875%
Long-term Debt [Member] | March 2015 UM Senior Notes [Member] | 2022
Debt Instrument [Line Items]
Redemption price					100.938%
Long-term Debt [Member] | March 2015 UM Senior Notes [Member] | 2023
Debt Instrument [Line Items]
Redemption price					100.469%
Long-term Debt [Member] | March 2015 UM Senior Notes [Member] | 2024 and thereafter
Debt Instrument [Line Items]
Redemption price					100.00%
Long-term Debt [Member] | March 2015 UM Senior Secured Notes [Member] | 2021
Debt Instrument [Line Items]
Redemption price					101.75%
Long-term Debt [Member] | March 2015 UM Senior Secured Notes [Member] | 2022
Debt Instrument [Line Items]
Redemption price					100.875%
Long-term Debt [Member] | March 2015 UM Senior Secured Notes [Member] | 2023
Debt Instrument [Line Items]
Redemption price					100.438%
Long-term Debt [Member] | March 2015 UM Senior Secured Notes [Member] | 2024 and thereafter
Debt Instrument [Line Items]
Redemption price					100.00%
Long-term Debt [Member] | 2015 UM Notes [Member]
Debt Instrument [Line Items]
Redemption term					12 months
Additional basis points used to determine redemption premium					50.00%	50.00%
Portion of debt threshold default In excess of which trigger event of default for aggregate debt					€ 75.0	$ 83.6
Redemption price, percentage in event that certain assets sold or specific control changed					101.00%	101.00%
UM Senior Secured Note Issuers [Member] | Long-term Debt [Member] | 2015 UM Senior Secured Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt								€ 500.0	$ 557.7
Interest rate								3.50%	3.50%
Unitymedia [Member] | Long-term Debt [Member] | 2015 UM Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt		€ 700.0					$ 780.7
Interest rate		3.75%					3.75%