Investments (Debt Securities) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	$ 1,882.3	$ 2,180.1
Accumulated unrealized gains	0.2	0.2
Fair value	2,029.5	2,276.1
Contractual maturity:
Due in one year or less	1,652.8
Due in one to five years	329.1
Due in five to ten years	47.6
Fair value	$ 2,029.5	2,276.1
Weighted Average
Contractual maturity:
Weighted average life	9 months 18 days
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	$ 903.4	1,066.5
Accumulated unrealized gains	0.6	(0.1)
Fair value	904.0	1,066.4
Contractual maturity:
Fair value	904.0	1,066.4
Government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	431.1	504.7
Accumulated unrealized gains	(0.3)	0.3
Fair value	430.8	505.0
Contractual maturity:
Fair value	430.8	505.0
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	300.7	373.1
Accumulated unrealized gains	0.0	0.1
Fair value	300.7	373.2
Contractual maturity:
Fair value	300.7	373.2
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	245.1	226.6
Accumulated unrealized gains	(0.1)	(0.1)
Fair value	245.0	226.5
Contractual maturity:
Fair value	245.0	226.5
Structured note
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 147.0	$ 95.8
Proportion of debt associated with the return on the leveraged structured note	100.00%	100.00%
Contractual maturity:
Fair value	$ 147.0	$ 95.8
Payment to acquire investment	$ 46.6
Structured note \| Affiliate \| VMO2 JV
Debt Securities, Available-for-sale [Line Items]
Proportion of debt associated with the return on the leveraged structured note	21.23%	31.49%
Structured note \| Affiliate \| VodafoneZiggo JV
Debt Securities, Available-for-sale [Line Items]
Proportion of debt associated with the return on the leveraged structured note	20.07%	7.37%
Structured note \| Sunrise Holding \| Subsidiaries
Debt Securities, Available-for-sale [Line Items]
Proportion of debt associated with the return on the leveraged structured note	40.08%	32.91%
Structured note \| Telenet \| Subsidiaries
Debt Securities, Available-for-sale [Line Items]
Proportion of debt associated with the return on the leveraged structured note	18.62%	28.23%
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis	$ 2.0	$ 9.2
Accumulated unrealized gains	0.0	0.0
Fair value	2.0	9.2
Contractual maturity:
Fair value	$ 2.0	$ 9.2

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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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