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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2026
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Debt Securities | Marketable debt securities accounted for as available-for-sale (AFS), and recorded within Other current assets in the Consolidated Balance Sheets, were as follows:
| As of June 30, 2026
|  |  |  |  |  |  |  |  | Fair Value of Securities with Contractual Maturities
(In millions) | Amortized Cost |  | Total Net Gains 1 |  | Total Net Losses 1 |  | Fair Value |  | Within 1 Year |  | After 1 Year through 5 Years |  | After 5 Years
U.S. Treasury | $20.1 |  | $— |  | $(0.1) |  | $20.0 |  | $3.6 |  | $12.1 |  | $4.3
Municipal securities | 10.5 |  | 0.1 |  | (0.1) |  | 10.5 |  | 1.6 |  | 7.5 |  | 1.4
Corporate debt | 27.6 |  | 0.1 |  | (0.1) |  | 27.6 |  | 3.4 |  | 16.5 |  | 7.7
Total | $58.2 |  | $0.2 |  | $(0.3) |  | $58.1 |  | $8.6 |  | $36.1 |  | $13.4
| As of December 31, 2025
|  |  |  |  |  |  |  |  | Fair Value of Securities with Contractual Maturities
(In millions) | Amortized Cost |  | Total Net Gains 1 |  | Total Net Losses 1 |  | Fair Value |  | Within 1 Year |  | After 1 Year through 5 Years |  | After 5 Years
U.S. Treasury | $21.4 |  | $0.2 |  | $— |  | $21.6 |  | $3.7 |  | $14.5 |  | $3.4
Municipal securities | 10.4 |  | 0.2 |  | — |  | 10.6 |  | 0.1 |  | 9.0 |  | 1.5
Corporate debt | 21.5 |  | 0.3 |  | — |  | 21.8 |  | 4.0 |  | 14.3 |  | 3.5
Total | $53.3 |  | $0.7 |  | $— |  | $54.0 |  | $7.8 |  | $37.8 |  | $8.4
1 Represents total unrealized gains (losses) for securities with net gains (losses) in Accumulated other comprehensive income.

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + 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 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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