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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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