Acquisitions and Dispositions (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions |
9 Months Ended | |
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Sep. 30, 2026 |
Sep. 30, 2025 |
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| Acquisitions and Dispositions [Abstract] | ||
| Revenue (in millions) | $ 6,901.7 | $ 6,830.3 |
| Net earnings (loss) attributable to Liberty Global shareholders | $ 207.9 | $ (4,247.0) |
| Basic earnings (loss) attributable to Liberty Global shareholders per share (in dollars per share) | $ 0.62 | $ (12.33) |
| Diluted earnings (loss) attributable to Liberty Global shareholders per share (in dollars per share) | $ 0.59 | $ (12.33) |
| Gain recognized on previously held equity interest | $ 121.6 | |
| Direct acquisition costs | $ 23.5 | |
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- Definition Acquisitions and Dispositions [Abstract] No definition available.
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- Definition Per basic share amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Per diluted share amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of pro forma revenue of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of gain from remeasurement of acquisition-date fair value of equity interest in acquiree held by acquirer immediately before acquisition date in business combination achieved in stages. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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