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Intangible Assets And Goodwill (Tables)
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of intangible assets
Intangible assets consisted of the following at September 30, 2024 and December 31, 2023:
 
 September 30, 2024December 31, 2023
(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$4,706.9 $(2,289.9)$2,417.0 $4,694.4 $(2,124.9)$2,569.5 
Technology-related intellectual property62.5 (62.5)— 62.5 (62.2)0.3 
Other73.6 (48.4)25.2 71.6 (41.2)30.4 
Total amortizable intangible assets$4,843.0 $(2,400.8)$2,442.2 $4,828.5 $(2,228.3)$2,600.2 
Indefinite-Lived Intangible Assets:
Trade names450.0 450.0 
Total intangible assets – other, net$2,892.2 $3,050.2 
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 Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits.
Future estimated amortization expense
As of September 30, 2024, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:
(in millions) Amortization Expense
Remainder of 2024$55.8 
2025223.2 
2026223.2 
2027221.9 
2028215.3 
2029215.3 
Thereafter1,287.5 
Schedule of Goodwill
Goodwill activity consisted of the following for the periods ended September 30, 2024 and December 31, 2023:
(in millions)Goodwill
Balance at December 31, 2022$10,482.5 
Foreign currency translation12.8
Balance at December 31, 202310,495.3 
Foreign currency translation18.8 
Balance at September 30, 2024$10,514.1