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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2026
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments in Debt Securities | Investments in debt securities at the end of each period were as follows (in millions):
| June 30, 2026 |  | December 31, 2025
Held-to-maturity | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses | Fair Value
Bank time deposits | $ | 39.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 39.0 |  |  | $ | 39.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 39.1 |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | 460.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 460.7 |  |  | $ | 452.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 452.3 |
U.S. government and agency securities | 214.5 |  |  | — |  |  | (0.4) |  |  | 214.1 |  |  | 466.5 |  |  | 0.2 |  |  | (0.4) |  |  | 466.3 |
Asset-backed securities | 39.4 |  |  | — |  |  | (0.5) |  |  | 38.9 |  |  | 35.6 |  |  | — |  |  | (0.6) |  |  | 35.0 |
Corporate debt securities | 636.9 |  |  | — |  |  | (0.6) |  |  | 636.3 |  |  | 347.2 |  |  | 0.1 |  |  | (0.4) |  |  | 346.9 |
Total | $ | 1,351.5 |  |  | $ | — |  |  | $ | (1.5) |  |  | $ | 1,350.0 |  |  | $ | 1,301.6 |  |  | $ | 0.3 |  |  | $ | (1.4) |  |  | $ | 1,300.5 |
Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity | The cost and fair value of investments in debt securities, by contractual maturity, as of June 30, 2026, were as follows (in millions):
| Held-to-Maturity |  | Available-for-Sale
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in 1 year or less | $ | 39.0 |  |  | $ | 39.0 |  |  | $ | 1,307.8 |  |  | $ | 1,307.2 |
Instruments not due at a single maturity date (a) | — |  |  | — |  |  | 43.7 |  |  | 42.8 |
| $ | 39.0 |  |  | $ | 39.0 |  |  | $ | 1,351.5 |  |  | $ | 1,350.0 |
_______________________________________________________________________________ (a) Consists of mortgage-backed and asset-backed securities.
Schedule of Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position | The following tables present gross unrealized losses and fair values for those investments that were in an unrealized loss position as of June 30, 2026 and December 31, 2025, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in millions):
| June 30, 2026
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. government and agency securities | $ | 241.9 |  |  | $ | (0.1) |  |  | $ | 8.0 |  |  | $ | (0.3) |  |  | $ | 249.9 |  |  | $ | (0.4) |
Asset-backed securities | 13.2 |  |  | (0.1) |  |  | 20.8 |  |  | (0.4) |  |  | 34.0 |  |  | (0.5) |
Corporate debt securities | 586.6 |  |  | (0.5) |  |  | 15.3 |  |  | (0.1) |  |  | 601.9 |  |  | (0.6) |
| $ | 841.7 |  |  | $ | (0.7) |  |  | $ | 44.1 |  |  | $ | (0.8) |  |  | $ | 885.8 |  |  | $ | (1.5) |
| December 31, 2025
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. government and agency securities | $ | — |  |  | $ | — |  |  | $ | 11.2 |  |  | $ | (0.4) |  |  | $ | 11.2 |  |  | $ | (0.4) |
Asset-backed securities | 5.1 |  |  | (0.1) |  |  | 24.3 |  |  | (0.5) |  |  | 29.4 |  |  | (0.6) |
Corporate debt securities | 76.7 |  |  | (0.1) |  |  | 34.3 |  |  | (0.3) |  |  | 111.0 |  |  | (0.4) |
| $ | 81.8 |  |  | $ | (0.2) |  |  | $ | 69.8 |  |  | $ | (1.2) |  |  | $ | 151.6 |  |  | $ | (1.4) |
Schedule of Investments in Unconsolidated Affiliates | These investments are recorded in Long-term Investments on the condensed consolidated balance sheets, and are as follows (in millions):
| June 30, 2026 |  | December 31, 2025
Equity method investments |  |  |
Carrying value of equity method investments | $ | 36.9 |  |  | $ | 34.7 |
Equity securities |  |  |
Carrying value of marketable equity securities | 28.8 |  |  | 7.1 |
Carrying value of non-marketable equity securities | 135.6 |  |  | 185.5 |
Total investments in unconsolidated entities | $ | 201.3 |  |  | $ | 227.3 |

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B + Details
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- Definition A tabular presentation of the information summarizing investments in and advances to majority-owned subsidiaries, other controlled companies, and other affiliates, as prescribed by the SEC. It reflects specified information about ownership, financial results from, and financial position in such entities. Includes the tabular presentations that disaggregate investments in and advances to majority-owned subsidiaries, other controlled companies, and other affiliates. + References No definition available. + Details
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