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Acquisitions and Dispositions (Narrative) (Details) SFr / shares in Units, $ / shares in Units, $ in Millions, SFr in Billions |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 11, 2020 CHF (SFr) SFr / shares | Nov. 11, 2020 USD ($) | May 07, 2020 | Mar. 31, 2021 USD ($) | Apr. 30, 2021 | Feb. 28, 2021 | Nov. 11, 2020 $ / shares
U.K. J.V. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Termination rights period |  |  | 24 months |  |  |  |
Extended period |  |  | 6 months |  |  |  |
Ownership percentage |  |  | 50.00% |  |  |  |
Telefonica |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Co-venturer ownership percentage |  |  | 50.00% |  |  | 50.00% |
Sunrise Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | (per share) | SFr 110 |  |  |  |  |  | $ 120
Consideration transferred | SFr 5.0 | $ 5,400.0 |  |  |  |  |
Percentage of shares tendered |  |  |  | 99.20% |  |  |
Recorded liability |  |  |  | $ 41.2 |  |  |
Sunrise Acquisition | Subsequent Event |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Interest acquired |  |  |  |  | 0.80% |  |

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