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Other Current and Non-current Assets - ZIM (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Schedule Of Other Assets [Line Items] |  |  |  |  |  |
Total gain on ZIM ordinary shares |  | $ (168,635,000) | $ 196,290,000 | $ (69,096,000) | $ 444,165,000 |
Non-current portion of unearned revenue |  | $ 152,564,000 |  | $ 152,564,000 |  | $ 37,977,000
ZIM |  |  |  |  |  |
Schedule Of Other Assets [Line Items] |  |  |  |  |  |
Ordinary shares owned |  | 5,686,950 |  | 5,686,950 |  | 7,186,950
Fair value of shareholding interest |  | $ 268,600,000 |  | $ 268,600,000 |  | $ 423,000,000.0
Ordinary shares sold | 1,500,000 |  |  |  |  |
Net proceeds from sale of ordinary shares | $ 85,300,000 |  |  |  |  |
Total gain on ZIM ordinary shares |  |  |  | (69,100,000) | 444,200,000 |
Unrealized gain |  | 268,600,000 |  | 268,600,000 |  |
Dividend received |  |  |  | 138,400,000 | $ 0 |
Dividends received net of withholdings of tax |  |  |  | 14,500,000 |  |
Non-current portion of unearned revenue |  | $ 60,900,000 |  | $ 60,900,000 |  | $ 39,900,000

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