Debt (Vendor Financing Obligations) (Schedule) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
2023 (remainder of year)	$ 155.5
2024	491.7
2025	337.3
Total debt	15,289.9	$ 13,370.2
Current portion	621.6
Long-term portion	14,513.9
UPC Holding
Debt Instrument [Line Items]
2023 (remainder of year)	43.0
2024	191.4
2025	0.0
Total debt	6,263.9
Current portion	234.4
Long-term portion	6,007.1
Telenet
Debt Instrument [Line Items]
2023 (remainder of year)	100.8
2024	285.2
2025	22.2
Total debt	5,856.0
Current portion	368.3
Long-term portion	5,477.9
Other
Debt Instrument [Line Items]
2023 (remainder of year)	11.7
2024	15.1
2025	315.1
Total debt	2,218.0
Current portion	18.9
Long-term portion	2,082.1
Vendor financing
Debt Instrument [Line Items]
2023 (remainder of year)	139.9
2024	470.2
2025	1.1
Total debt	611.2	$ 704.7	$ 660.8	$ 843.2
Current portion	602.2
Long-term portion	9.0
Vendor financing | UPC Holding
Debt Instrument [Line Items]
2023 (remainder of year)	43.0
2024	191.4
2025	0.0
Total debt	234.4
Current portion	234.4
Long-term portion	0.0
Vendor financing | Telenet
Debt Instrument [Line Items]
2023 (remainder of year)	85.2
2024	263.7
2025	0.0
Total debt	348.9
Current portion	348.9
Long-term portion	0.0
Vendor financing | Other
Debt Instrument [Line Items]
2023 (remainder of year)	11.7
2024	15.1
2025	1.1
Total debt	27.9
Current portion	18.9
Long-term portion	$ 9.0