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GOODWILL AND INTANGIBLE ASSETS, NET - Schedule of intangible assets by segment (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Intangible Assets |  |
Balance at beginning of the year | $ 1,729.0 |
Amortization | (32.9) | $ (32.5)
Changes in foreign currency exchange rates | 2.0 |
Balance at end of the year | 1,698.1 |
Options |  |
Intangible Assets |  |
Balance at beginning of the year | 173.4 |
Amortization | (3.8) |
Balance at end of the year | 169.6 |
North American Equities |  |
Intangible Assets |  |
Balance at beginning of the year | 1,055.5 |
Amortization | (17.1) |
Changes in foreign currency exchange rates | 0.4 |
Balance at end of the year | 1,038.8 |
Europe |  |
Intangible Assets |  |
Balance at beginning of the year | 386.8 |
Amortization | (6.2) |
Changes in foreign currency exchange rates | 1.6 |
Balance at end of the year | 382.2 |
Global FX |  |
Intangible Assets |  |
Balance at beginning of the year | 113.3 |
Amortization | (5.8) |
Balance at end of the year | $ 107.5 |

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- Definition Finite-lived and Indefinite-lived Intangible Assets [Roll Forward] + References No definition available. + Details
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- Definition Intangible Assets, Foreign Currency Translation Gain (Loss) + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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