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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Intangible Assets |  |  |  |
Balance at beginning of the period |  | $ 1,561.5 | $ 1,662.8 |
Dispositions |  |  | (0.8) |
Amortization |  | (88.7) | (116.6) | $ (124.3)
Changes in foreign currency exchange rates |  | (16.0) | 16.1 |
Additions |  | 1.2 |  |
Sales |  | 0.1 |  |
Impairment of intangible assets |  | (81.0) | 0.0 | 0.0
Balance at end of the period |  | 1,376.9 | 1,561.5 | 1,662.8
Options |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  | 134.1 | 146.1 |
Dispositions |  |  | 0.0 |
Amortization |  | (7.7) | (12.0) |
Changes in foreign currency exchange rates |  | 0.0 | 0.0 |
Additions |  | 0.0 |  |
Sales |  | 0.0 |  |
Impairment of intangible assets |  | 0.0 |  |
Balance at end of the period |  | 126.4 | 134.1 | 146.1
North American Equities |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  | 935.3 | 992.8 |
Dispositions |  |  | 0.0 |
Amortization |  | (50.6) | (59.5) |
Changes in foreign currency exchange rates |  | (6.3) | 2.0 |
Additions |  | 1.2 |  |
Sales |  | 0.0 |  |
Impairment of intangible assets |  | 0.0 |  |
Balance at end of the period |  | 879.6 | 935.3 | 992.8
Europe and Asia Pacific |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  | 352.5 | 359.9 |
Dispositions |  |  | 0.0 |
Amortization |  | (16.1) | (21.5) |
Changes in foreign currency exchange rates |  | (9.7) | 14.1 |
Additions |  | 0.0 |  |
Sales |  | 0.0 |  |
Impairment of intangible assets |  | 0.0 |  |
Balance at end of the period |  | 326.7 | 352.5 | 359.9
Global FX |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  | 56.2 | 72.8 |
Dispositions |  |  | 0.0 |
Amortization |  | (12.0) | (16.6) |
Changes in foreign currency exchange rates |  | 0.0 | 0.0 |
Additions |  | 0.0 |  |
Sales |  | 0.0 |  |
Impairment of intangible assets |  | 0.0 |  |
Balance at end of the period |  | 44.2 | 56.2 | 72.8
Digital |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  | 83.4 | 91.2 |
Dispositions |  |  | (0.8) |
Amortization |  | (2.3) | (7.0) |
Changes in foreign currency exchange rates |  | 0.0 | 0.0 |
Additions |  | 0.0 |  |
Sales |  | 0.1 |  |
Impairment of intangible assets | $ (81.0) | (81.0) |  |
Balance at end of the period |  | $ 0.0 | $ 83.4 | $ 91.2

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- Definition Finite-lived and Indefinite-lived Intangible Assets [Roll Forward] + References No definition available. + Details
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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. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: 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 4: 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 + Details
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