Long-lived Assets - Schedule of Goodwill (Details) $ in Millions	3 Months Ended
Mar. 31, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill. beginning balance	$ 3,007.5
Foreign currency translation	39.7
Goodwill. ending balance	3,047.2
Liberty Caribbean
Goodwill [Roll Forward]
Goodwill. beginning balance	1,207.9
Foreign currency translation	2.9
Goodwill. ending balance	1,210.8
C&W Panama
Goodwill [Roll Forward]
Goodwill. beginning balance	617.1
Foreign currency translation	0.0
Goodwill. ending balance	617.1
Liberty Networks
Goodwill [Roll Forward]
Goodwill. beginning balance	669.3
Foreign currency translation	1.0
Goodwill. ending balance	670.3
Liberty Costa Rica
Goodwill [Roll Forward]
Goodwill. beginning balance	513.2
Foreign currency translation	35.8
Goodwill. ending balance	$ 549.0

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details