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Plant, Property and Equipment, Net - Components (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Plant, Property and Equipment, Net      
Total property, plant and equipment $ 2,473.6 $ 2,202.2  
Less accumulated depreciation (1,643.2) (1,476.4)  
Plant, Property and Equipment, Net 830.4 725.8  
Depreciation expense 192.8 178.9 $ 168.9
Losses (gains) on sale of operating assets, net 0.4 (1.1) $ 0.0
Distribution facilities      
Plant, Property and Equipment, Net      
Total property, plant and equipment 1,510.6 1,341.1  
Customer premise equipment      
Plant, Property and Equipment, Net      
Total property, plant and equipment 274.9 272.3  
Head-end equipment      
Plant, Property and Equipment, Net      
Total property, plant and equipment 296.5 256.7  
Computer equipment and software      
Plant, Property and Equipment, Net      
Total property, plant and equipment 182.0 156.4  
Telephony infrastructure      
Plant, Property and Equipment, Net      
Total property, plant and equipment 48.0 52.4  
Buildings and leasehold improvements      
Plant, Property and Equipment, Net      
Total property, plant and equipment 33.4 33.4  
Vehicles      
Plant, Property and Equipment, Net      
Total property, plant and equipment 28.1 22.9  
Office and technical equipment      
Plant, Property and Equipment, Net      
Total property, plant and equipment 19.1 19.1  
Land      
Plant, Property and Equipment, Net      
Total property, plant and equipment 4.4 4.4  
Construction in progress (including material inventory and other)      
Plant, Property and Equipment, Net      
Total property, plant and equipment $ 76.6 $ 43.5