Investments (Debt Securities) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	$ 0.0		$ 344.6
Accumulated unrealized gains (losses)	0.0		0.5
Fair value	77.9		433.1
Proceeds from sale of debt securities	700.0	$ 1,100.0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	0.0		72.0
Accumulated unrealized gains (losses)	0.0		(0.1)
Fair value	0.0		71.9
Government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	0.0		129.4
Accumulated unrealized gains (losses)	0.0		0.4
Fair value	0.0		129.8
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	0.0		70.5
Accumulated unrealized gains (losses)	0.0		0.0
Fair value	0.0		70.5
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	0.0		66.4
Accumulated unrealized gains (losses)	0.0		0.2
Fair value	0.0		66.6
Structured notes
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 77.9		88.0
Payment to acquire investment			46.6
Proceeds from sale of debt securities			$ 62.3
Debt instrument, proportion of debt associated with return	100.00%		100.00%
Structured notes \| Affiliate \| VodafoneZiggo JV
Debt Securities, Available-for-sale [Line Items]
Debt instrument, proportion of debt associated with return	34.80%		33.90%
Structured notes \| Affiliate \| VMO2 JV
Debt Securities, Available-for-sale [Line Items]
Debt instrument, proportion of debt associated with return	28.40%		0.00%
Structured notes \| Affiliate \| Other
Debt Securities, Available-for-sale [Line Items]
Debt instrument, proportion of debt associated with return	0.00%		34.00%
Structured notes \| Telenet \| Subsidiaries
Debt Securities, Available-for-sale [Line Items]
Debt instrument, proportion of debt associated with return	36.80%		32.10%
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	$ 0.0		$ 6.3
Accumulated unrealized gains (losses)	0.0		0.0
Fair value	$ 0.0		$ 6.3

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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