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GOODWILL AND INTANGIBLE ASSETS, NET - Goodwill by segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill
Balance at beginning of the period	$ 3,025.4
Changes in foreign currency exchange rates	(7.3)
Balance at end of the period	3,018.1
Options
Goodwill
Balance at beginning of the period	305.8
Balance at end of the period	305.8
North American Equities
Goodwill
Balance at beginning of the period	1,876.9
Changes in foreign currency exchange rates	0.6
Balance at end of the period	1,877.5
Europe and Asia Pacific
Goodwill
Balance at beginning of the period	575.5
Changes in foreign currency exchange rates	(7.9)
Balance at end of the period	567.6
Global FX
Goodwill
Balance at beginning of the period	267.2
Balance at end of the period	267.2
Futures
Goodwill
Balance at end of the period	$ 0.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
-Paragraph 1
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-SubTopic 20
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- Definition

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+ References

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