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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD - Intangible assets by segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Intangible Assets |  |  |
Balance at beginning of the period | $ 1,662.8 | $ 1,668.6 |
Adjustments |  | (61.0) |
Additions |  | 226.0 |
Dispositions | (0.8) |  |
Amortization | (116.6) | (124.3) | $ (126.6)
Changes in foreign currency exchange rates | 16.1 | (46.5) |
Balance at end of the period | 1,561.5 | 1,662.8 | 1,668.6
Options |  |  |
Intangible Assets |  |  |
Balance at beginning of the period | 146.1 | 159.1 |
Amortization | (12.0) | (13.0) |
Balance at end of the period | 134.1 | 146.1 | 159.1
North American Equities |  |  |
Intangible Assets |  |  |
Balance at beginning of the period | 992.8 | 991.4 |
Adjustments |  | (61.0) |
Additions |  | 130.1 |
Amortization | (59.5) | (62.1) |
Changes in foreign currency exchange rates | 2.0 | (5.6) |
Balance at end of the period | 935.3 | 992.8 | 991.4
Europe and Asia Pacific |  |  |
Intangible Assets |  |  |
Balance at beginning of the period | 359.9 | 426.4 |
Amortization | (21.5) | (25.6) |
Changes in foreign currency exchange rates | 14.1 | (40.9) |
Balance at end of the period | 352.5 | 359.9 | 426.4
Global FX |  |  |
Intangible Assets |  |  |
Balance at beginning of the period | 72.8 | 91.7 |
Amortization | (16.6) | (18.9) |
Balance at end of the period | 56.2 | 72.8 | $ 91.7
Digital |  |  |
Intangible Assets |  |  |
Balance at beginning of the period | 91.2 |  |
Additions |  | 95.9 |
Dispositions | (0.8) |  |
Amortization | (7.0) | (4.7) |
Balance at end of the period | $ 83.4 | $ 91.2 |

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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 Amount of increase (decrease) from adjustments to finite and indefinite lived intangible assets. + 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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