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Description of the business and summary of significant accounting policies: - Financial instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Jun. 17, 2025
Level 2 | Interest rate swap    
Description of the business and summary of significant accounting policies:    
long-term liability $ 4.1  
Senior unsecured 2027 notes | Level 2    
Description of the business and summary of significant accounting policies:    
Senior notes $ 450.0  
Interest rate (as a percent) 7.00%  
Senior notes, fair value $ 445.5  
Senior Unsecured Mirror Notes due 2027 | Level 2    
Description of the business and summary of significant accounting policies:    
Senior notes $ 300.0  
Interest rate (as a percent) 7.00%  
Senior notes, fair value $ 297.0  
Senior secured 2026 notes    
Description of the business and summary of significant accounting policies:    
Interest rate (as a percent) 3.50%  
Senior secured 2026 notes | Level 2    
Description of the business and summary of significant accounting policies:    
Senior notes $ 600.0  
Interest rate (as a percent) 6.50%  
Secured IPv4 Notes | Level 2    
Description of the business and summary of significant accounting policies:    
Senior notes $ 380.4  
Senior notes, fair value $ 390.7  
Senior secured 2032 notes    
Description of the business and summary of significant accounting policies:    
Interest rate (as a percent) 6.50% 6.50%
Senior secured 2032 notes | Level 2    
Description of the business and summary of significant accounting policies:    
Senior notes, fair value $ 553.5