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Investments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |
Revenue | $ 1,945.1 | $ 1,868.4 |
Other assets, current | 692.9 |  | $ 847.0
Proceeds from sale of debt securities | 1,100.0 | 2,400.0 |
Realized net losses | 11.2 | 19.2 |
UK JV Services |  |  |
Schedule of Investments [Line Items] |  |  |
Revenue | 112.3 | 65.8 |
VMO2 JV |  |  |
Schedule of Investments [Line Items] |  |  |
Revenue | 3,282.8 | 3,162.7 |
Dividends received |  | 198.3 |
VMO2 JV | Related Party |  |  |
Schedule of Investments [Line Items] |  |  |
Other assets, current | 29.4 |  | 18.6
JV Services |  |  |
Schedule of Investments [Line Items] |  |  |
Revenue | 62.1 | 65.0 |
VodafoneZiggo JV |  |  |
Schedule of Investments [Line Items] |  |  |
Revenue | 1,114.0 | $ 1,083.4 |
VodafoneZiggo JV | Related Party |  |  |
Schedule of Investments [Line Items] |  |  |
Other assets, current | $ 37.6 |  | $ 24.2

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