Debt (Components of Debt) (Details) € in Millions, $ in Millions	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate	3.28%	3.28%
Unused borrowing capacity	$ 1,586.4
Total debt before deferred financing costs, discounts and premiums	14,650.9		$ 14,516.3
Deferred financing costs, discounts and premiums, net	(60.3)		(118.4)
Total carrying amount of debt	14,590.6		14,397.9
Finance lease obligations (note 10)	493.2		549.5
Total debt and finance lease obligations	15,083.8		14,947.4
Current maturities of debt and finance lease obligations	(986.5)		(1,086.1)
Long-term debt and finance lease obligations	$ 14,097.3		13,861.3
UPC Holding Bank Facility
Debt Instrument [Line Items]
Weighted average interest rate	2.87%	2.87%
Unused borrowing capacity	$ 828.6
Total debt before deferred financing costs, discounts and premiums	4,085.8		4,767.1
Total carrying amount of debt	$ 4,059.8
UPCB SPE Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.43%	4.43%
Total debt before deferred financing costs, discounts and premiums	$ 1,944.2		1,393.7
Total carrying amount of debt	$ 1,938.7
UPC Holding Senior Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.59%	4.59%
Total debt before deferred financing costs, discounts and premiums	$ 1,222.6		1,261.5
Telenet Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	2.14%	2.14%
Total debt before deferred financing costs, discounts and premiums	$ 3,579.3		3,652.0
Telenet Senior Secured Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.73%	4.73%
Total debt before deferred financing costs, discounts and premiums	$ 1,624.8		1,660.2
VM Ireland Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	3.50%	3.50%
Unused borrowing capacity	$ 115.7	€ 100.0
Total debt before deferred financing costs, discounts and premiums	$ 1,041.3		0.0
Vendor financing
Debt Instrument [Line Items]
Weighted average interest rate	2.01%	2.01%
Total debt before deferred financing costs, discounts and premiums	$ 1,003.5		1,099.6
ITV Collar Loan
Debt Instrument [Line Items]
Weighted average interest rate	0.00%	0.00%
Total debt before deferred financing costs, discounts and premiums	$ 0.0		415.9
Other
Debt Instrument [Line Items]
Weighted average interest rate	7.08%	7.08%
Total debt before deferred financing costs, discounts and premiums	$ 149.4		$ 266.3