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Description of the business and summary of significant accounting policies: - Allowance for credit losses - Narrative (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:      
Bad debt recoveries $ (2.9) $ (1.9) $ (1.9)