Segments - Schedule of Capital Expenditures by Segment (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total	$ 349.2	$ 208.1
Operating Segments
Segment Reporting Information [Line Items]
Total	328.8	208.1
Corporate/shared operating expenses
Segment Reporting Information [Line Items]
Total	20.4	0.0
Kinetic \| Operating Segments
Segment Reporting Information [Line Items]
Total	251.9	0.0
Uniti Solutions \| Operating Segments
Segment Reporting Information [Line Items]
Total	6.5	0.0
Fiber Infrastructure \| Operating Segments
Segment Reporting Information [Line Items]
Total	$ 70.4	$ 208.1

Amount of expenditure for addition to long-lived assets included in determination of segment assets by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Excludes expenditure for addition to financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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