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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