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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD (Tables)
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill details by segment
The following table presents the details of goodwill by segment (in millions):
OptionsNorth American
Equities		Europe and
Asia Pacific		Global FXTotal
Balance as of December 31, 2023$305.8 $2,004.4 $563.2 $267.2 $3,140.6 
Changes in foreign currency exchange rates— (3.3)13.2 — 9.9 
Balance as of September 30, 2024$305.8 $2,001.1 $576.4 $267.2 $3,150.5 
Schedule of details of intangible assets by segment
The following table presents the details of the intangible assets by segment (in millions):
OptionsNorth American
Equities		Europe and
Asia Pacific		Global FXDigitalTotal
Balance as of December 31, 2023$134.1 $935.3 $352.5 $56.2 $83.4 $1,561.5 
Additions— 1.0 — — — 1.0 
Sales— — — — (0.1)(0.1)
Amortization(6.0)(38.6)(12.2)(9.1)(2.3)(68.2)
Changes in foreign currency exchange rates— (1.7)13.2 — — 11.5 
Impairment— — — — (81.0)(81.0)
Balance as of September 30, 2024$128.1 $896.0 $353.5 $47.1 $— $1,424.7 
Schedule of categories of intangible assets by segment
The following tables present the categories of intangible assets by segment as of September 30, 2024 and December 31, 2023 (in millions, except as stated):
September 30, 2024Weighted
Average
Amortization
Period (in years)
OptionsNorth
American
Equities		Europe
and Asia
Pacific		Global FXDigital
Trading registrations and licenses$95.5 $605.3 $218.4 $— $— Indefinite
Customer relationships46.6 412.9 224.4 140.0 — 15
Market data customer relationships53.6 322.0 64.6 64.4 — 8
Technology28.1 56.5 35.3 22.5 — 6
Trademarks and trade names12.9 8.2 2.5 1.2 — 5
Digital assets held— 1.0 — — — Indefinite
Accumulated amortization(108.6)(509.9)(191.7)(181.0)— 
$128.1$896.0$353.5$47.1$—
December 31, 2023Weighted
Average
Amortization
Period (in years)
OptionsNorth
American
Equities		Europe
and Asia
Pacific		Global FXDigital
Trading registrations and licenses$95.5 $606.0 $209.6 $— $25.0 Indefinite
Customer relationships46.6 413.9 216.1 140.0 — 15
Market data customer relationships53.6 322.0 61.6 64.4 — 8
Technology28.1 56.9 34.2 22.5 70.0 7
Trademarks and trade names12.9 8.2 2.4 1.2 — 6
Digital assets held— — — — 0.1 Indefinite
Accumulated amortization(102.6)(471.7)(171.4)(171.9)(11.7)
$134.1$935.3$352.5$56.2$83.4