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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | Financial assets and liabilities carried at fair value and measured on a recurring basis as of March 31, 2024 are classified in the hierarchy as follows (in millions):
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial assets carried at fair value: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Time deposits | — |  |  | 50.0 |  |  | — |  |  | 50.0 |
Money market funds | 137.4 |  |  | — |  |  | — |  |  | 137.4 |
Total cash equivalents (a) | 137.4 |  |  | 50.0 |  |  | — |  |  | 187.4 |
Restricted investments (b) | 7.1 |  |  | — |  |  | — |  |  | 7.1 |
Equity securities (c) | 7,721.7 |  |  | — |  |  | — |  |  | 7,721.7 |
Loan under the fair value option (d) | — |  |  | — |  |  | 330.6 |  |  | 330.6 |
Available-for-sale investments: |  |  |  |  |  |  |
Corporate debt securities | — |  |  | 551.0 |  |  | — |  |  | 551.0 |
U.S. government sponsored agencies | — |  |  | 281.4 |  |  | — |  |  | 281.4 |
Foreign government obligations | — |  |  | 3.8 |  |  | — |  |  | 3.8 |
Municipal obligations | — |  |  | 9.5 |  |  | — |  |  | 9.5 |
Asset-backed securities | — |  |  | 293.3 |  |  | — |  |  | 293.3 |
Total available-for-sale investments (e) | — |  |  | 1,139.0 |  |  | — |  |  | 1,139.0 |
Forward foreign exchange contracts (f) | — |  |  | 2.3 |  |  | — |  |  | 2.3 |
Total financial assets carried at fair value | $ | 7,866.2 |  |  | $ | 1,191.3 |  |  | $ | 330.6 |  |  | $ | 9,388.1 |
Financial liabilities carried at fair value: |  |  |  |  |  |  |
Forward foreign exchange contracts (g) | $ | — |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | 1.3 |
Contingent consideration (h) | — |  |  | — |  |  | 17.7 |  |  | 17.7 |
Total financial liabilities carried at fair value | $ | — |  |  | $ | 1.3 |  |  | $ | 17.7 |  |  | $ | 19.0 |
Financial assets and liabilities carried at fair value and measured on a recurring basis as of December 31, 2023 are classified in the hierarchy as follows (in millions):
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial assets carried at fair value: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Commercial paper | $ | — |  |  | $ | 12.5 |  |  | $ | — |  |  | $ | 12.5 |
Time deposits | — |  |  | 36.6 |  |  | — |  |  | 36.6 |
U.S. government sponsored agencies | — |  |  | 7.0 |  |  | — |  |  | 7.0 |
Money market funds | 28.0 |  |  | — |  |  | — |  |  | 28.0 |
Total cash equivalents (a) | 28.0 |  |  | 56.1 |  |  | — |  |  | 84.1 |
Restricted investments (b) | 7.1 |  |  | — |  |  | — |  |  | 7.1 |
Equity securities (c) | 7,399.3 |  |  | — |  |  | — |  |  | 7,399.3 |
Loan under the fair value option (d) | — |  |  | — |  |  | 325.7 |  |  | 325.7 |
Available-for-sale investments: |  |  |  |  |  |  |
Corporate debt securities | — |  |  | 531.6 |  |  | — |  |  | 531.6 |
U.S. government sponsored agencies | — |  |  | 255.9 |  |  | — |  |  | 255.9 |
Foreign government obligations | — |  |  | 12.7 |  |  | — |  |  | 12.7 |
Municipal obligations | — |  |  | 12.1 |  |  | — |  |  | 12.1 |
Asset-backed securities | — |  |  | 323.7 |  |  | — |  |  | 323.7 |
Total available-for-sale investments (e) | — |  |  | 1,136.0 |  |  | — |  |  | 1,136.0 |
Forward foreign exchange contracts (f) | — |  |  | 4.1 |  |  | — |  |  | 4.1 |
Total financial assets carried at fair value | $ | 7,434.4 |  |  | $ | 1,196.2 |  |  | $ | 325.7 |  |  | $ | 8,956.3 |
Financial liabilities carried at fair value: |  |  |  |  |  |  |
Forward foreign exchange contracts (g) | $ | — |  |  | $ | 11.7 |  |  | $ | — |  |  | $ | 11.7 |
Contingent consideration (h) | — |  |  | — |  |  | 17.5 |  |  | 17.5 |
Total financial liabilities carried at fair value | $ | — |  |  | $ | 11.7 |  |  | $ | 17.5 |  |  | $ | 29.2 |
(a)Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets. (b) 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 |
(c) 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 |
(d) The Loan under the fair value option is included in Other investments in the condensed consolidated balance sheets. (e) Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets. (f) Forward foreign exchange contracts in an asset position are included in Other current assets in the condensed consolidated balance sheets. (g) Forward foreign exchange contracts in a liability position are included in Other current liabilities in the condensed consolidated balance sheets. (h) 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.
Debt Securities, Available-for-sale | Available-for-sale investments consist of the following (in millions):
| March 31, 2024
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  |  | Estimated Fair Value
Short-term investments: |  |  |  |  |  |  |  |
Corporate debt securities | $ | 553.3 |  |  | $ | 0.8 |  |  | $ | (3.1) |  |  |  | $ | 551.0 |
Municipal obligations | 9.6 |  |  | — |  |  | (0.1) |  |  |  | 9.5 |
Asset-backed securities | 294.4 |  |  | 0.6 |  |  | (1.7) |  |  |  | 293.3 |
U.S. government sponsored agencies | 283.5 |  |  | 0.1 |  |  | (2.2) |  |  |  | 281.4 |
Foreign government obligations | 3.8 |  |  | — |  |  | — |  |  |  | 3.8 |
| $ | 1,144.6 |  |  | $ | 1.5 |  |  | $ | (7.1) |  |  |  | $ | 1,139.0 |
Available-for-sale investments consist of the following (in millions):
| December 31, 2023
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  |  | Estimated Fair Value
Short-term investments: |  |  |  |  |  |  |  |
Corporate debt securities | $ | 534.1 |  |  | $ | 0.8 |  |  | $ | (3.3) |  |  |  | $ | 531.6 |
Municipal obligations | 12.2 |  |  | — |  |  | (0.1) |  |  |  | 12.1 |
Asset-backed securities | 325.7 |  |  | 0.7 |  |  | (2.7) |  |  |  | 323.7 |
U.S. government sponsored agencies | 257.4 |  |  | 0.1 |  |  | (1.6) |  |  |  | 255.9 |
Foreign government obligations | 12.8 |  |  | — |  |  | (0.1) |  |  |  | 12.7 |
Total | $ | 1,142.2 |  |  | $ | 1.6 |  |  | $ | (7.8) |  |  |  | $ | 1,136.0 |
Summary of amortized cost and estimated fair value of debt securities by contractual maturity date | The following is a summary of the amortized cost and estimated fair value of our debt securities at March 31, 2024 by contractual maturity date (in millions):
| Amortized Cost |  | Estimated Fair Value
Mature in less than one year | $ | 272.1 |  |  | $ | 270.3 |
Mature in one to five years | 724.7 |  |  | 721.7 |
Mature in more than five years | 147.8 |  |  | 147.0 |
Total | $ | 1,144.6 |  |  | $ | 1,139.0 |
Discussion of current derivative risk management | The following is a summary of our forward foreign currency exchange contracts (in millions):
Contracts maturing in April through June 2024 to sell foreign currency: | March 31, 2024
Notional value | $ | 673.7 |
Unrealized loss | $ | 0.8 |
Contracts maturing in April through June 2024 to purchase foreign currency: |
Notional value | $ | 65.1 |
Unrealized gain | $ | 0.1 |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The carrying value and fair value of our long-term debt were as follows (in millions):
|  | March 31, 2024 |  | December 31, 2023
|  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Senior notes |  | $ | 1,189.9 |  |  | $ | 1,097.2 |  |  | $ | 1,189.5 |  |  | $ | 1,102.5 |
Other long-term debt |  | 9.5 |  |  | 9.5 |  |  | 9.6 |  |  | 9.6 |
Total |  | $ | 1,199.4 |  |  | $ | 1,106.7 |  |  | $ | 1,199.1 |  |  | $ | 1,112.1 |
Fair Value Measurement Inputs and Valuation Techniques | The following table provides a reconciliation of the Level 3 Loan measured at estimated fair value (in millions):
December 31, 2023 | $ | 325.7 |
Net increase in estimated fair market value of the loan included in Gains (losses) in fair market value of equity securities and loan receivable | $ | 12.3 |
Foreign currency exchange gains (losses), net | $ | (7.4) |
March 31, 2024 | $ | 330.6 |

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