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Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized Gain on Securities |  | $ 402.3 |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI |  | 330.6 | $ 325.7 |  |
Debt Securities, Available-for-sale | [1] | 1,139.0 |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | 12.3 |  |  |
Foreign exchange (gains) losses, net |  | (7.4) |  |  |
Fair Value, Option, Loans Held as Assets [Abstract] |  |  |  |  |
Debt Securities | [2] |  |  |  | $ 400.0
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions |  | (8.8) |  |  |
Derivative, Forward Interest Rate |  |  |  |  | 1.50%
Investment Owned, Unrecognized Unrealized Appreciation (Depreciation), Net [Abstract] |  |  |  |  |
Value appreciation rights, Unrecognized Unrealized Appreciation (Depreciation), Net |  | $ (3.5) |  |  |
Ordinary voting shares [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment ownership percentage |  | 38.00% |  |  |
Preference shares [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment ownership percentage |  | 27.00% |  |  |
Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | $ 7.1 | 7.1 |  |
Equity Securities | [4] | 7,721.7 | 7,399.3 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 330.6 | 325.7 |  |
Debt Securities, Available-for-sale | [1] | 1,139.0 | 1,136.0 |  |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 2.3 | 4.1 |  |
Assets, Fair Value Disclosure |  | 9,388.1 | 8,956.3 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 1.3 | 11.7 |  |
Business Combination, Contingent Consideration, Liability | [7] | 17.7 | 17.5 |  |
Liabilities, Fair Value Disclosure |  | 19.0 | 29.2 |  |
Fair Value, Recurring | Research and Development Expense |  |  |  |  |
Investment Owned, Unrecognized Unrealized Appreciation (Depreciation), Net [Abstract] |  |  |  |  |
Changes in fair value of contingent consideration |  | 0.2 |  |  |
Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 7.1 | 7.1 |  |
Equity Securities | [4] | 7,721.7 | 7,399.3 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 0.0 | 0.0 |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure |  | 7,866.2 | 7,434.4 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | [7] | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure |  | 0.0 | 0.0 |  |
Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 0.0 | 0.0 |  |
Equity Securities | [4] | 0.0 | 0.0 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 0.0 | 0.0 |  |
Debt Securities, Available-for-sale |  | 1,139.0 | 1,136.0 | [1] |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 2.3 | 4.1 |  |
Assets, Fair Value Disclosure |  | 1,191.3 | 1,196.2 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 1.3 | 11.7 |  |
Business Combination, Contingent Consideration, Liability | [7] | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure |  | 1.3 | 11.7 |  |
Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 0.0 | 0.0 |  |
Equity Securities | [4] | 0.0 | 0.0 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 330.6 | 325.7 |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure |  | 330.6 | 325.7 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | [7] | 17.7 | 17.5 |  |
Liabilities, Fair Value Disclosure |  | 17.7 | 17.5 |  |
Commercial Paper [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 12.5 |  |
Commercial Paper [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 0.0 |  |
Commercial Paper [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 12.5 |  |
Commercial Paper [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 0.0 |  |
Time Deposits [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 50.0 | 36.6 |  |
Time Deposits [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 0.0 | 0.0 |  |
Time Deposits [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 50.0 | 36.6 |  |
Time Deposits [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 0.0 | 0.0 |  |
Money Market Funds [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 137.4 | 28.0 |  |
Money Market Funds [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 137.4 | 28.0 |  |
Money Market Funds [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 0.0 | 0.0 |  |
Money Market Funds [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 0.0 | 0.0 |  |
Cash Equivalents [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 187.4 | 84.1 |  |
Cash Equivalents [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 137.4 | 28.0 |  |
Cash Equivalents [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 50.0 | 56.1 |  |
Cash Equivalents [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] | 0.0 | 0.0 |  |
US Treasury Securities | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 7.0 |  |
US Treasury Securities | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 7.0 |  |
US Treasury Securities | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 0.0 |  |
Foreign Government Debt [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [8] |  | 0.0 |  |
Municipal Obligations (Member) | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 9.5 | 12.1 |  |
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 9.5 | 12.1 |  |
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 3.8 | 12.7 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 3.8 | 12.7 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 551.0 | 531.6 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 551.0 | 531.6 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 281.4 | 255.9 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 281.4 | 255.9 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Asset-backed Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 293.3 | 323.7 |  |
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 293.3 | 323.7 |  |
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Short-term Investments [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity Securities | [4] | 73.3 | 67.2 |  |
Debt Securities, Available-for-sale | [1] | 1,139.0 | 1,136.0 |  |
Short-term Investments [Member] | Municipal Obligations (Member) | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 9.5 | 12.1 |  |
Short-term Investments [Member] | Foreign Government Obligations [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 3.8 | 12.7 |  |
Short-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 551.0 | 531.6 |  |
Short-term Investments [Member] | US Government Sponsored Agencies [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 281.4 | 255.9 |  |
Short-term Investments [Member] | Asset-backed Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 293.3 | 323.7 |  |
Other Investments [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 1.5 | 1.5 |  |
Equity Securities | [4] | 7,648.4 | 7,332.1 |  |
Restricted investment [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | $ 5.6 | $ 5.6 |  |
[1] | Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.
[2] | The Loan under the fair value option is included in Other investments in the condensed consolidated balance sheets.
[3] | Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
| March 31, 2024 |  | December 31, 2023
Restricted investments | $ | 5.6 |  |  | $ | 5.6 |
Other investments | 1.5 |  |  | 1.5 |
Total | $ | 7.1 |  |  | $ | 7.1 |
[4] | Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
| March 31, 2024 |  | December 31, 2023
Short-term investments | $ | 73.3 |  |  | $ | 67.2 |
Other investments | 7,648.4 |  |  | 7,332.1 |
Total | $ | 7,721.7 |  |  | $ | 7,399.3 |
[5] | Forward foreign exchange contracts in an asset position are included in Other current assets in the condensed consolidated balance sheets.
[6] | Forward foreign exchange contracts in a liability position are included in Other current liabilities in the condensed consolidated balance sheets.
[7] | Contingent considerations in a liability position are included in Other long-term liabilities in the condensed consolidated balance sheets. The changes in the fair value of contingent consideration included in Research and development expense amounted to $0.2 million in the consolidated statements of income for the three months ended March 31, 2024. No conditions triggering payment of the contingent consideration were met as of March 31, 2024.
[8] | Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.

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