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Fair Value Measures and Disclosures (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | The tables below present information about items that are measured at fair value:
|  | Fair Value as of |  | Level within the Fair Value Hierarchy as of June 30, 2025
(in millions) |  | June 30, 2025 |  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents |  | $ | 70.6 |  |  | $ | 70.6 |  |  | $ | — |  |  | $ | — |
Investments: |  |  |  |  |  |  |  |
Marketable equity investments, exchange-traded funds, and mutual funds |  | 32.9 |  |  | 32.9 |  |  | — |  |  | — |
Marketable debt securities |  | 1.4 |  |  | 1.4 |  |  | — |  |  | — |
Investments in unconsolidated entities: |  |  |  |  |  |  |  |
Non-current investment in Wealth Advisors |  | 27.3 |  |  | 27.3 |  |  | — |  |  | — |
Total |  | $ | 132.2 |  |  | $ | 132.2 |  |  | $ | — |  |  | $ | — |
|  | Fair Value as of |  | Level within the Fair Value Hierarchy as of December 31, 2024
(in millions) |  | December 31, 2024 |  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents |  | $ | 43.5 |  |  | $ | 43.5 |  |  | $ | — |  |  | $ | — |
Investments: |  |  |  |  |  |  |  |
Marketable equity investments, exchange-traded funds, and mutual funds |  | 42.3 |  |  | 42.3 |  |  | — |  |  | — |
Marketable debt securities |  | 2.4 |  |  | 2.4 |  |  | — |  |  | — |
Investments in unconsolidated entities: |  |  |  |  |  |  |  |
Investment in SmartX Advisory Solutions |  | 24.7 |  |  | — |  |  | — |  |  | 24.7 |
Non-current investment in Wealth Advisors |  | 24.9 |  |  | 24.9 |  |  | — |  |  | — |
Total |  | $ | 137.8 |  |  | $ | 113.1 |  |  | $ | — |  |  | $ | 24.7 |

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- Definition Tabular disclosure of financial instrument measured at fair value on recurring or nonrecurring basis. Includes, but is not limited to, instrument classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
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