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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | $ 1,561.5 |
Additions |  |  | 1.0 |
Amortization | $ (21.3) | $ (29.3) | (47.5) | $ (60.2)
Changes in foreign currency exchange rates |  |  | (9.3) |
Impairment | 81.0 |  | 81.0 |
Balance at end of the period | 1,424.7 |  | 1,424.7 |
Options |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 134.1 |
Amortization |  |  | (4.2) |
Balance at end of the period | 129.9 |  | 129.9 |
North American Equities |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 935.3 |
Additions |  |  | 1.0 |
Amortization |  |  | (26.2) |
Changes in foreign currency exchange rates |  |  | (2.4) |
Balance at end of the period | 907.7 |  | 907.7 |
Europe and Asia Pacific |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 352.5 |
Amortization |  |  | (8.4) |
Changes in foreign currency exchange rates |  |  | (6.9) |
Balance at end of the period | 337.2 |  | 337.2 |
Global FX |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 56.2 |
Amortization |  |  | (6.4) |
Balance at end of the period | 49.8 |  | 49.8 |
Digital |  |  |  |
Intangible Assets |  |  |  |
Balance at beginning of the period |  |  | 83.4 |
Amortization |  |  | (2.3) |
Impairment | 81.0 |  | 81.0 |
Balance at end of the period | $ 0.1 |  | $ 0.1 |

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition, excluding goodwill. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-1 + Details
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