Derivative Instruments (Foreign Currency Forwards) (Schedule) (Details) - Dec. 31, 2016 € in Millions, £ in Millions, SFr in Millions, PLN in Millions, HUF in Millions, CZK in Millions, CLP in Millions, $ in Millions	PLN PLN / € PHP / £ ₨ / £	EUR (€) PLN / € PHP / £ ₨ / £	USD ($) PLN / € PHP / £ ₨ / £	GBP (£) PLN / € PHP / £ ₨ / £	HUF PLN / € PHP / £ ₨ / £	CHF (SFr) PLN / € PHP / £ ₨ / £	CZK PLN / € PHP / £ ₨ / £	CLP PLN / € PHP / £ ₨ / £
Foreign Currency Forward 1 [Member] | LGE Financing
Derivative [Line Items]
Notional amount of derivative		€ 143.8	$ 166.1
Foreign Currency Forward 2 [Member] | LGE Financing
Derivative [Line Items]
Notional amount of derivative			133.7	£ 94.6
Foreign Currency Forward 3 [Member] | LGE Financing
Derivative [Line Items]
Notional amount of derivative		126.0		99.0
Foreign Currency Forward 4 [Member] | LGE Financing
Derivative [Line Items]
Notional amount of derivative		3.2		2.7
Foreign Currency Forward 5 [Member] | UPC Broadband Holding [Member]
Derivative [Line Items]
Notional amount of derivative			2.6				CZK 60.0
Foreign Currency Forward 6 [Member] | UPC Broadband Holding [Member]
Derivative [Line Items]
Notional amount of derivative		368.1				SFr 398.6
Foreign Currency Forward 7 [Member] | UPC Broadband Holding [Member]
Derivative [Line Items]
Notional amount of derivative		20.1					CZK 540.0
Foreign Currency Forward 8 [Member] | UPC Broadband Holding [Member]
Derivative [Line Items]
Notional amount of derivative		19.0			HUF 6,000.0
Foreign Currency Forward 9 [Member] | UPC Broadband Holding [Member]
Derivative [Line Items]
Notional amount of derivative	PLN 160.9	36.0
Foreign Currency Forward 10 [Member] | UPC Broadband Holding [Member]
Derivative [Line Items]
Notional amount of derivative		1.2		0.9
Foreign Currency Forward 11 [Member] | Telenet N.V.
Derivative [Line Items]
Notional amount of derivative		€ 41.5	47.1
Foreign Currency Forward 12 [Member] | VTR [Member]
Derivative [Line Items]
Notional amount of derivative			$ 149.7					CLP 104,207.4
Foreign Currency Forward Option 1 [Member] | VMIH [Member]
Derivative [Line Items]
Notional amount of derivative				£ 7.0
Weighted Average Strike Price | ₨ / £	95.28	95.28	95.28	95.28	95.28	95.28	95.28	95.28
Foreign Currency Forward Option 2 [Member] | VMIH [Member]
Derivative [Line Items]
Notional amount of derivative				£ 16.9
Weighted Average Strike Price | PHP / £	66.35	66.35	66.35	66.35	66.35	66.35	66.35	66.35
Foreign Currency Forward Option 3 [Member] | VMIH [Member]
Derivative [Line Items]
Notional amount of derivative | €		€ 286.6
Weighted Average Strike Price | PLN / €	4.07	4.07	4.07	4.07	4.07	4.07	4.07	4.07