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Investments (Schedule of Investments) (Details) £ in Millions, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 16, 2024 USD ($) | Feb. 16, 2024 GBP (£) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 9,890.4 | $ 9,987.6
Short-term, separately-managed accounts (SMAs) |  |  | 1,652.8 | 1,990.5
Total investments |  |  | 5,224.7 | 5,399.0
Total investments |  |  | 15,115.1 | 15,386.6
Short-term investments |  |  | 1,652.8 | 1,990.5
Long-term investments |  |  | $ 13,462.3 | $ 13,396.1
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  |  | Other current assets (notes 3 and 4) | Other current assets (notes 3 and 4)
Accrued interest |  |  | $ 35.2 | $ 34.6
VMO2 JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 7,175.1 | 7,248.5
Ownership percentage |  |  | 50.00% |
VodafoneZiggo JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 1,998.5 | 2,055.4
Ownership percentage |  |  | 50.00% |
VodafoneZiggo JV | VodafoneZiggo JV Loan |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Excess of carrying amount over proportional share in investees net assets |  |  | $ 1,213.8 | 1,234.7
Related party note receivable rate |  |  | 5.55% |
Interest accrued |  |  | $ 13.8 |
VodafoneZiggo JV | VodafoneZiggo JV Receivable I |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Related party note receivable |  |  | 755.8 | 774.5
VodafoneZiggo JV | VodafoneZiggo JV Receivable II |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Related party note receivable |  |  | 224.4 | 230.0
AtlasEdge JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 272.0 | 250.8
Ownership percentage |  |  | 48.20% |
All3Media Ltd. (All3Media) (d) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 149.4 | 144.2
Ownership percentage | 100.00% | 100.00% | 50.00% |
Cash proceeds from equity sale | $ 397.7 | £ 315.0 |  |
Formula E Holdings Ltd (Formula E) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 101.9 | 99.1
Ownership percentage |  |  | 35.90% |
nexfibre JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 67.8 | 55.9
Ownership percentage |  |  | 25.00% |
Other |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity |  |  | $ 125.7 | 133.7
Long-term investments at fair value |  |  | 369.6 | 361.9
Vodafone - subject to re-use rights |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term, SMAs |  |  | 1,187.6 | 1,168.1
Total investments |  |  | $ 122.3 | 115.5
Ownership percentage |  |  | 4.90% |
EdgeConneX, Inc. (EdgeConneX) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term investments at fair value |  |  | $ 402.8 | 318.3
Ownership percentage |  |  | 5.20% |
Televisa Univision, Inc. (Televisa Univision) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term, SMAs |  |  | $ 388.3 | 388.3
Ownership percentage |  |  | 6.00% |
SMAs |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term, SMAs |  |  | $ 376.7 | 285.6
ITV plc (ITV) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term investments at fair value |  |  | $ 371.9 | 321.9
Ownership percentage |  |  | 9.90% |
Plume Design, Inc. (Plume) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term, SMAs |  |  | $ 167.3 | 168.4
Ownership percentage |  |  | 11.50% |
Warrants, fair value |  |  | $ 60.9 | 61.3
Pax8, Inc. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term, SMAs |  |  | $ 101.1 | 100.3
Ownership percentage |  |  | 5.60% |
CANAL+ Polska S.A. |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term investments at fair value |  |  | $ 75.2 | 76.4
Ownership percentage |  |  | 17.00% |
Lions Gate Entertainment Corp. (Lionsgate) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term investments at fair value |  |  | $ 63.6 | 69.6
Ownership percentage |  |  | 2.80% |
Aviatrix Systems, Inc. (Aviatrix) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term investments at fair value |  |  | $ 41.2 | 55.5
Ownership percentage |  |  | 3.30% |
Lacework, Inc. (Lacework) |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Long-term investments at fair value |  |  | $ 26.6 | $ 94.2
Ownership percentage |  |  | 3.30% |

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