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Depreciation and amortization expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating expenses:      
Operating expenses $ 1,370.3 $ 756.3 $ 291.6
General and administrative expenses 26.0 22.9 22.5
Total depreciation and amortization expense $ 1,396.3 $ 779.2 $ 314.1