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Description of the business and summary of significant accounting policies: - Gross receipts taxes, universal service fund and other surcharges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Description of the business and summary of significant accounting policies:      
Excise taxes and surcharge $ 80.4 $ 50.2 $ 15.4