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3. Fair Value Measurements (Details) € in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI |  | $ 322.6 | [1] | € 400.0 | $ 443.1 | [1]
Debt Securities, Available-for-sale | [2] | 1,300.0 |  |  |  |
Business Combination, Contingent Consideration, Liability | [3] | 36.1 |  |  |  |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI, Unrealized Loss |  | (5,070.0) |  |  |  |
Fair Value, Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted Investments, at Fair Value | [4] | 6.8 |  |  | 6.9 |
Equity Securities, FV-NI | [5] | 8,530.4 |  |  | 13,977.5 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 322.6 |  |  | 443.1 |
Debt Securities, Available-for-sale |  | 1,300.0 |  |  | 327.7 |
Forward foreign exchange contracts, Asset | [6] | 1.5 |  |  | 1.7 |
Financial Assets Carried at Fair Value |  | 10,227.0 |  |  | 14,899.5 |
Forward foreign exchange contracts, Liability | [7] | 6.2 |  |  | 2.8 |
Business Combination, Contingent Consideration, Liability | [3] | 35.6 |  |  |  |
Liabilities, Fair Value Disclosure |  |  |  |  | 2.8 |
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 333.4 |  |  | 87.3 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 699.3 |  |  | 182.3 |
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 230.7 |  |  | 44.3 |
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 13.5 |  |  | 1.0 |
Fair Value, Recurring [Member] | Foreign Government Debt [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  |  | 3.8 |
Fair Value, Recurring [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 23.1 |  |  | 9.0 |
Fair Value, Recurring [Member] | Commercial Paper [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 21.1 |  |  | 39.8 |
Fair Value, Recurring [Member] | Time Deposits [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 5.7 |  |  | 17.3 |
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 1.4 |  |  | 0.1 |
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 31.5 |  |  | 50.7 |
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 6.0 |  |  | 33.6 |
Fair Value, Recurring [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 65.7 |  |  | 142.6 |
Fair Value, Recurring [Member] | 8888 Foreign Governments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.8 |
Fair Value, Recurring [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.3 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted Investments, at Fair Value | [4] | 6.8 |  |  | 6.9 |
Equity Securities, FV-NI | [5] | 8,530.4 |  |  | 13,977.5 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 0.0 |  |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |  | 0.0 |
Forward foreign exchange contracts, Asset | [6] | 0.0 |  |  | 0.0 |
Financial Assets Carried at Fair Value |  | 8,574.4 |  |  | 14,042.3 |
Forward foreign exchange contracts, Liability | [7] | 0.0 |  |  | 0.0 |
Business Combination, Contingent Consideration, Liability | [3] | 0.0 |  |  |  |
Liabilities, Fair Value Disclosure |  |  |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Time Deposits [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 5.7 |  |  | 7.2 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 31.5 |  |  | 50.7 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 37.2 |  |  | 57.9 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | 8888 Foreign Governments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted Investments, at Fair Value | [4] | 0.0 |  |  | 0.0 |
Equity Securities, FV-NI | [5] | 0.0 |  |  | 0.0 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 0.0 |  |  | 0.0 |
Debt Securities, Available-for-sale |  | 1,300.0 |  |  | 327.7 |
Forward foreign exchange contracts, Asset | [6] | 1.5 |  |  | 1.7 |
Financial Assets Carried at Fair Value |  | 1,330.0 |  |  | 414.1 |
Forward foreign exchange contracts, Liability | [7] | 6.2 |  |  | 2.8 |
Business Combination, Contingent Consideration, Liability | [3] | 0.0 |  |  |  |
Liabilities, Fair Value Disclosure |  |  |  |  | 2.8 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 333.4 |  |  | 87.3 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 699.3 |  |  | 182.3 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 230.7 |  |  | 44.3 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 13.5 |  |  | 1.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  |  | 3.8 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 23.1 |  |  | 9.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 21.1 |  |  | 39.8 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 10.1 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 1.4 |  |  | 0.1 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 6.0 |  |  | 33.6 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 28.5 |  |  | 84.7 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | 8888 Foreign Governments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.8 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.3 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted Investments, at Fair Value | [4] | 0.0 |  |  | 0.0 |
Equity Securities, FV-NI | [5] | 0.0 |  |  | 0.0 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 322.6 |  |  | 443.1 |
Debt Securities, Available-for-sale |  | 0.0 |  |  | 0.0 |
Forward foreign exchange contracts, Asset | [6] | 0.0 |  |  | 0.0 |
Financial Assets Carried at Fair Value |  | 322.6 |  |  | 443.1 |
Forward foreign exchange contracts, Liability | [7] | 0.0 |  |  | 0.0 |
Business Combination, Contingent Consideration, Liability | [3] | 35.6 |  |  |  |
Liabilities, Fair Value Disclosure |  |  |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Time Deposits [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] | 0.0 |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | 8888 Foreign Governments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash equivalents | [8] |  |  |  | 0.0 |
Fair value of Appreciation rights |  |  |  |  |  |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] |  |  |  |  |  |
Investment Owned, Unrecognized Unrealized Depreciation |  | 75.0 |  |  |  |
Short-term Investments [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI |  | 56.5 |  |  | 71.4 |
Short-term Investments [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 333.4 |  |  | 87.4 |
Short-term Investments [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 699.3 |  |  | 182.2 |
Short-term Investments [Member] | Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 230.7 |  |  | 44.3 |
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 13.5 |  |  | 1.0 |
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Debt [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  |  | 3.8 |
Short-term Investments [Member] | Fair Value, Recurring [Member] | Municipal Obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 23.1 |  |  | 9.0 |
Short-term Investments [Member] | Fair Value, Recurring [Member] | Debt Securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 1,300.0 |  |  | 327.7 |
Other Investments [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted Investments, at Fair Value |  | 1.2 |  |  | 1.3 |
Equity Securities, FV-NI |  | 8,473.9 |  |  | 13,906.1 |
Restricted investment | Fair Value, Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted Investments, at Fair Value |  | $ 5.6 |  |  | $ 5.6 |
[1] | The Loan under the fair value option is included in Other investments in the consolidated balance sheets.
[2] | Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.
[3] | Contingent considerations in a liability position are included in Other long-term liabilities in the consolidated balance sheets.
[4] | Restricted investments are included in the following accounts in the consolidated balance sheets (in millions):
| December 31, 2022 |  | December 31, 2021
Restricted investments | $ | 5.6 |  |  | $ | 5.6 |
Other investments | 1.2 |  | 1.3 |
Total | $ | 6.8 |  |  | $ | 6.9 |
[5] | Equity securities are included in the following accounts in the consolidated balance sheets (in millions):
| December 31, 2022 |  | December 31, 2021
Short-term investments | $ | 56.5 |  |  | $ | 71.4 |
Other investments | 8,473.9 |  |  | 13,906.1 |
Total | $ | 8,530.4 |  |  | $ | 13,977.5 |
[6] | Forward foreign exchange contracts in an asset position are included in Other current assets in the consolidated balance sheets.
[7] | Forward foreign exchange contracts in a liability position are included in Other current liabilities in the consolidated balance sheets.
[8] | Cash equivalents are included in Cash and cash equivalents in the consolidated balance sheets.

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