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Intangible Assets and Goodwill (Tables)
12 Months Ended
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]  
Components of intangible assets
Intangible assets consisted of the following at December 31, 2023 and 2022: 
 20232022
(in millions)Assigned ValueAccumulated
Amortization
Net Book
Value
Assigned ValueAccumulated
Amortization
Net Book
Value
Amortizable Intangible Assets:
Clearing firm, market data and other customer relationships $4,694.4 $(2,124.9)$2,569.5 $4,685.8 $(1,909.7)$2,776.1 
Technology-related intellectual property62.5 (62.2)0.3 62.5 (55.8)6.7 
Other71.6 (41.2)30.4 69.5 (32.6)36.9 
Total Amortizable Intangible Assets$4,828.5 $(2,228.3)$2,600.2 $4,817.8 $(1,998.1)$2,819.7 
Indefinite-Lived Intangible Assets:
Trade names450.0 450.0 
Total Intangible Assets—Other, Net$3,050.2 $3,269.7 
Trading products (1)
$17,175.3 $17,175.3 
 _______________
(1)Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the CFTC. Product authorizations from the CFTC have no term limits.
Weighted average useful life for the amortizable intangible assets
The originally assigned useful lives for the amortizable intangible assets as of December 31, 2023 are as follows:
Clearing firm, market data and other customer relationships5 - 30 years
Technology-related intellectual property5 - 9 years
Other3 - 24.5 years
Future estimated amortization expense As of December 31, 2023, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:  
(in millions) 
2024$222.2 
2025222.2 
2026222.2 
2027220.9 
2028214.5 
Thereafter1,498.2