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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible Assets by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | $ 1,376.9 |
Sales |  |  | (0.6) |
Amortization | $ (17.2) | $ (20.7) | (52.8) | $ (68.2)
Changes in foreign currency exchange rates |  |  | 25.7 |
Impairment |  |  | (18.9) |
Balance at end of the period | 1,330.3 |  | 1,330.3 |
Options |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 126.4 |
Sales |  |  | 0.0 |
Amortization |  |  | (4.8) |
Changes in foreign currency exchange rates |  |  | 0.0 |
Impairment |  |  | 0.0 |
Balance at end of the period | 121.6 |  | 121.6 |
North American Equities |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 879.6 |
Sales |  |  | (0.6) |
Amortization |  |  | (30.0) |
Changes in foreign currency exchange rates |  |  | 2.2 |
Impairment |  |  | 0.0 |
Balance at end of the period | 851.2 |  | 851.2 |
Europe and Asia Pacific |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 326.7 |
Sales |  |  | 0.0 |
Amortization |  |  | (10.7) |
Changes in foreign currency exchange rates |  |  | 23.5 |
Impairment |  |  | (18.9) |
Balance at end of the period | 320.6 |  | 320.6 |
Global FX |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 44.2 |
Sales |  |  | 0.0 |
Amortization |  |  | (7.3) |
Changes in foreign currency exchange rates |  |  | 0.0 |
Impairment |  |  | 0.0 |
Balance at end of the period | $ 36.9 |  | $ 36.9 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-18 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-11 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-12 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-6 + Details
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