Long-lived Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill beginning balance	$ 5,133.3	$ 5,673.6
Acquisitions and related adjustments	45.4	174.9
Dispositions	(33.6)
Foreign currency translation adjustments and other	(56.8)	(105.2)
Impairments	(181.9)	(610.0)
Goodwill ending balance	4,906.4	5,133.3
Accumulated goodwill impairments	1,348.0	1,166.0
C&W
Goodwill [Roll Forward]
Goodwill beginning balance	4,325.6	4,962.5
Acquisitions and related adjustments	37.1	23.6
Foreign currency translation adjustments and other	(36.4)	(50.5)
Impairments	(181.9)	(610.0)
Goodwill ending balance	4,110.8	4,325.6
VTR/Cabletica
Goodwill [Roll Forward]
Goodwill beginning balance	530.0	433.4
Acquisitions and related adjustments	8.3	151.3
Foreign currency translation adjustments and other	(20.4)	(54.7)
Impairments	0.0	0.0
Goodwill ending balance	517.9	530.0
Liberty Puerto Rico
Goodwill [Roll Forward]
Goodwill beginning balance	277.7	277.7
Acquisitions and related adjustments	0.0	0.0
Foreign currency translation adjustments and other	0.0	0.0
Impairments	0.0	0.0
Goodwill ending balance	277.7	$ 277.7
Seychelles Disposition
Goodwill [Roll Forward]
Dispositions	0.0
Seychelles Disposition \| C&W
Goodwill [Roll Forward]
Dispositions	(33.6)
Seychelles Disposition \| VTR/Cabletica
Goodwill [Roll Forward]
Dispositions	$ 0.0

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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