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GOODWILL, INTANGIBLE ASSETS, NET, AND DIGITAL ASSETS HELD (Tables)
 12 Months Ended
Dec. 31, 2025
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 
Adjustments0.2 (0.8)0.4 0.2 — 
Changes in foreign currency exchange rates— (12.8)(3.6)— (16.4)
Balance as of December 31, 2024$306.0 $1,990.8 $560.0 $267.4 $3,124.2 
Changes in foreign currency exchange rates— 7.3 19.0 — 26.3 
Balance as of December 31, 2025$306.0 $1,998.1 $579.0 $267.4 $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— 1.2 — — — 1.2 
Sales— — — — (0.1)(0.1)
Amortization(7.7)(50.6)(16.1)(12.0)(2.3)(88.7)
Changes in foreign currency exchange rates— (6.3)(9.7)— — (16.0)
Impairment— — — — (81.0)(81.0)
Balance as of December 31, 2024$126.4 $879.6 $326.7 $44.2 $— $1,376.9 
Sales— (0.7)— — — (0.7)
Amortization(6.5)(39.9)(14.2)(9.6)— (70.2)
Changes in foreign currency exchange rates— 3.3 24.5 — — 27.8 
Impairment— (17.7)(18.9)— — (36.6)
Balance as of December 31, 2025$119.9 $824.6 $318.1 $34.6 $— $1,297.2 
Schedule of categories of intangible assets by segment The following tables present the categories of intangible assets by segment as of December 31, 2025 and 2024 (in millions, except as stated):
December 31, 2025Weighted
Average
Amortization
Period (in years)
OptionsNorth American
Equities		Europe and
Asia Pacific		Global FX
Trading registrations and licenses$95.5 $586.9 $219.4 $— Indefinite
Customer relationships46.6 412.1 204.7 140.0 13
Market data customer relationships53.6 322.0 65.1 64.4 6
Technology27.9 55.5 35.7 22.5 6
Trademarks and tradenames12.9 8.2 2.5 1.2 4
Digital assets held— 0.7 — — Indefinite
Accumulated amortization(116.6)(560.8)(209.3)(193.5)
$119.9 $824.6 $318.1 $34.6 
December 31, 2024Weighted
Average
Amortization
Period (in years)
OptionsNorth American
Equities		Europe and
Asia Pacific		Global FX
Trading registrations and licenses$95.5 $603.4 $205.2 $— Indefinite
Customer relationships46.6 409.7 209.2 140.0 14
Market data customer relationships53.6 322.0 60.8 64.4 7
Technology28.1 55.5 33.6 22.5 7
Trademarks and tradenames12.9 8.1 2.3 1.2 5
Digital assets held— 1.2 — — Indefinite
Accumulated amortization(110.3)(520.3)(184.4)(183.9)
$126.4 $879.6 $326.7 $44.2