Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Gross carrying amount	$ 6,700.7	$ 7,380.0
Accumulated amortization	(3,230.9)	(3,722.3)
Net carrying amount	3,469.8	3,657.7
Customer Relationships [Member]
Gross carrying amount	6,097.3	6,802.7
Accumulated amortization	(3,018.8)	(3,564.6)
Net carrying amount	3,078.5	3,238.1
Other Intangible Assets [Member]
Gross carrying amount	603.4	577.3
Accumulated amortization	(212.1)	(157.7)
Net carrying amount	391.3	419.6
Liberty Global Group [Member]
Gross carrying amount	5,206.4	5,977.7
Accumulated amortization	(3,013.5)	(3,554.5)
Net carrying amount	2,192.9	2,423.2
Liberty Global Group [Member] | Customer Relationships [Member]
Gross carrying amount	4,688.5	5,499.4
Accumulated amortization	(2,820.2)	(3,404.5)
Net carrying amount	1,868.3	2,094.9
Liberty Global Group [Member] | Other Intangible Assets [Member]
Gross carrying amount	517.9	478.3
Accumulated amortization	(193.3)	(150.0)
Net carrying amount	324.6	328.3
LiLAC Group [Member]
Gross carrying amount	1,494.3	1,402.3
Accumulated amortization	(217.4)	(167.8)
Net carrying amount	1,276.9	1,234.5
LiLAC Group [Member] | Customer Relationships [Member]
Gross carrying amount	1,408.8	1,303.3
Accumulated amortization	(198.6)	(160.1)
Net carrying amount	1,210.2	1,143.2
LiLAC Group [Member] | Other Intangible Assets [Member]
Gross carrying amount	85.5	99.0
Accumulated amortization	(18.8)	(7.7)
Net carrying amount	$ 66.7	$ 91.3