Segment Reporting - Schedule of Revenue and Adjusted OIBDA by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Revenue	$ 1,117.4	$ 1,112.5	$ 3,302.8	$ 3,282.7
Liberty Networks
Segment Reporting [Line Items]
Revenue	(22.0)	23.0	67.0	69.0
Operating Segments
Segment Reporting [Line Items]
Revenue	1,139.4	1,137.3	3,369.9	3,356.0
Adjusted OIBDA	471.7	461.4	1,354.7	1,341.8
Operating Segments \| Liberty Caribbean
Segment Reporting [Line Items]
Revenue	366.0	368.8	1,082.2	1,099.0
Adjusted OIBDA	172.4	172.5	500.3	519.6
Operating Segments \| C&W Panama
Segment Reporting [Line Items]
Revenue	189.4	199.1	541.8	553.4
Adjusted OIBDA	72.4	71.8	201.5	205.0
Operating Segments \| Liberty Networks
Segment Reporting [Line Items]
Revenue	122.0	116.7	373.6	341.7
Adjusted OIBDA	55.7	65.2	177.6	183.9
Operating Segments \| Liberty Puerto Rico
Segment Reporting [Line Items]
Revenue	288.6	298.2	872.3	897.9
Adjusted OIBDA	102.7	95.5	286.5	264.0
Operating Segments \| Liberty Costa Rica
Segment Reporting [Line Items]
Revenue	173.4	154.5	500.0	464.0
Adjusted OIBDA	68.5	56.4	188.8	169.3
Corporate
Segment Reporting [Line Items]
Revenue	3.5	3.5	10.6	11.2
Adjusted OIBDA	(17.7)	(28.0)	(59.6)	(86.8)
Intersegment eliminations
Segment Reporting [Line Items]
Revenue	$ (25.5)	$ (28.3)	$ (77.7)	$ (84.5)