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Plant, Property and Equipment, Net - Components (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Plant, Property and Equipment, Net
Total property, plant and equipment	$ 2,594.0	$ 2,594.0		$ 2,594.0		$ 2,473.6
Less accumulated depreciation	(1,770.2)	(1,770.2)		(1,770.2)		(1,643.2)
Plant, Property and Equipment, Net	823.8	823.8		823.8		830.4
Depreciation expense		52.5	$ 48.9	157.7	$ 141.1
Gain (loss) on sale of operating assets, net		(2.6)	$ (0.4)	(2.3)	$ (0.3)
Hurricane Helene
Plant, Property and Equipment, Net
Loss from write-down of fixed assets	2.4
Distribution facilities
Plant, Property and Equipment, Net
Total property, plant and equipment	1,628.3	1,628.3		1,628.3		1,510.6
Head-end equipment
Plant, Property and Equipment, Net
Total property, plant and equipment	297.5	297.5		297.5		296.5
Customer premise equipment
Plant, Property and Equipment, Net
Total property, plant and equipment	274.6	274.6		274.6		274.9
Computer equipment and software
Plant, Property and Equipment, Net
Total property, plant and equipment	196.0	196.0		196.0		182.0
Telephony infrastructure
Plant, Property and Equipment, Net
Total property, plant and equipment	48.0	48.0		48.0		48.0
Buildings and leasehold improvements
Plant, Property and Equipment, Net
Total property, plant and equipment	34.1	34.1		34.1		33.4
Vehicles
Plant, Property and Equipment, Net
Total property, plant and equipment	30.0	30.0		30.0		28.1
Office and technical equipment
Plant, Property and Equipment, Net
Total property, plant and equipment	19.2	19.2		19.2		19.1
Land
Plant, Property and Equipment, Net
Total property, plant and equipment	4.4	4.4		4.4		4.4
Construction in progress (including material inventory and other)
Plant, Property and Equipment, Net
Total property, plant and equipment	$ 61.9	$ 61.9		$ 61.9		$ 76.6

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