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Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | [1] | $ 1,141.4 | $ 1,141.4 |
Debt Securities, Available-for-sale | [1] | 1,135.6 | 1,135.6 |
Equity Securities, FV-NI, Unrealized Loss |  | (2,874.4) | (2,472.1) |
Equity Securities without Readily Determinable Fair Value, Amount |  | 6.5 | 6.5 | $ 6.5
Equity Method Investments |  | 33.9 | 33.9 | 32.3
Fair Value, Recurring |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [1] | 1,135.6 | 1,135.6 | 1,136.0
Fair Value, Recurring | Corporate Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [1] | 545.0 | 545.0 | 531.6
Fair Value, Recurring | Municipal obligations [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [1] | 8.3 | 8.3 | 12.1
Fair Value, Recurring | US Government Sponsored Agencies [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [1] | 246.1 | 246.1 | 255.9
Fair Value, Recurring | Foreign Government Obligations [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [1] | 2.6 | 2.6 | 12.7
Fair Value, Recurring | Asset-backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [1] | 333.6 | 333.6 | 323.7
Fair Value, Recurring | Short-term Investments [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | [1] | 1,141.4 | 1,141.4 | 1,142.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 1.3 | 1.3 | 1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (7.1) | (7.1) | (7.8)
Debt Securities, Available-for-sale | [1] | 1,135.6 | 1,135.6 | 1,136.0
Fair Value, Recurring | Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | [1] | 547.3 | 547.3 | 534.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.7 | 0.7 | 0.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (3.0) | (3.0) | (3.3)
Debt Securities, Available-for-sale | [1] | 545.0 | 545.0 | 531.6
Fair Value, Recurring | Short-term Investments [Member] | Municipal obligations [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | [1] | 8.3 | 8.3 | 12.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0 | (0.1)
Debt Securities, Available-for-sale | [1] | 8.3 | 8.3 | 12.1
Fair Value, Recurring | Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | [1] | 248.1 | 248.1 | 257.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.1 | 0.1 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (2.1) | (2.1) | (1.6)
Debt Securities, Available-for-sale | [1] | 246.1 | 246.1 | 255.9
Fair Value, Recurring | Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | [1] | 2.6 | 2.6 | 12.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0 | (0.1)
Debt Securities, Available-for-sale | [1] | 2.6 | 2.6 | 12.7
Fair Value, Recurring | Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | [1] | 335.1 | 335.1 | 325.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.5 | 0.5 | 0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (2.0) | (2.0) | (2.7)
Debt Securities, Available-for-sale | [1] | $ 333.6 | $ 333.6 | $ 323.7
[1] | Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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