Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Gross carrying amount	$ 7,380.0	$ 10,639.8
Accumulated amortization	(3,722.3)	(3,547.3)
Net carrying amount	3,657.7	7,092.5
Customer Relationships [Member]
Gross carrying amount	6,802.7	10,434.3
Accumulated amortization	(3,564.6)	(3,442.4)
Net carrying amount	3,238.1	6,991.9
Other Intangible Assets [Member]
Gross carrying amount	577.3	205.5
Accumulated amortization	(157.7)	(104.9)
Net carrying amount	$ 419.6	100.6
Minimum [Member] | Customer Relationships [Member]
Estimated useful life	4 years
Minimum [Member] | Other Intangible Assets [Member]
Estimated useful life	2 years
Maximum [Member] | Customer Relationships [Member]
Estimated useful life	15 years
Maximum [Member] | Other Intangible Assets [Member]
Estimated useful life	20 years
Liberty Global Group [Member]
Gross carrying amount	$ 5,977.7	10,490.6
Accumulated amortization	(3,554.5)	(3,515.5)
Net carrying amount	2,423.2	6,975.1
Liberty Global Group [Member] | Customer Relationships [Member]
Gross carrying amount	5,499.4	10,285.3
Accumulated amortization	(3,404.5)	(3,410.7)
Net carrying amount	2,094.9	6,874.6
Liberty Global Group [Member] | Other Intangible Assets [Member]
Gross carrying amount	478.3	205.3
Accumulated amortization	(150.0)	(104.8)
Net carrying amount	328.3	100.5
LiLAC Group [Member]
Gross carrying amount	1,402.3	149.2
Accumulated amortization	(167.8)	(31.8)
Net carrying amount	1,234.5	117.4
LiLAC Group [Member] | Customer Relationships [Member]
Gross carrying amount	1,303.3	149.0
Accumulated amortization	(160.1)	(31.7)
Net carrying amount	1,143.2	117.3
LiLAC Group [Member] | Other Intangible Assets [Member]
Gross carrying amount	99.0	0.2
Accumulated amortization	(7.7)	(0.1)
Net carrying amount	$ 91.3	$ 0.1