Long-lived Assets (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Value added tax, vendor financing arrangement	$ 14.8	$ 17.0
Deferred liabilities	420.5		$ 428.1
Finite lived intangible assets, net	2,019.2		$ 2,342.4
Telenet Wyre Transaction
Property, Plant and Equipment [Line Items]
Finite lived intangible assets, net		384.1
Vendor financing
Property, Plant and Equipment [Line Items]
Capital-related vendor financing additions	$ 129.9	$ 142.9