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Intangible Assets and Goodwill (Components of Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Net book value |  | $ 2,821.6 | $ 3,050.2
Other Indefinite-lived Intangible Assets | [1] | 17,175.3 | 17,175.3
Trade Names [Member] |  |  |
Net book value |  | 450.0 | 450.0
Clearing Firm, Market Data, and Other Customer Relationships [Member] |  |  |
Cost |  | 4,683.5 | 4,694.4
Accumulated amortization |  | (2,334.4) | (2,124.9)
Net book value |  | 2,349.1 | 2,569.5
Technology-Related Intellectual Property [Member] |  |  |
Cost |  | 62.5 | 62.5
Accumulated amortization |  | (62.5) | (62.2)
Net book value |  | 0.0 | 0.3
Other Intangible Assets [Member] |  |  |
Cost |  | 71.1 | 71.6
Accumulated amortization |  | (48.6) | (41.2)
Net book value |  | 22.5 | 30.4
Finite-Lived Intangible Assets [Member] |  |  |
Cost |  | 4,817.1 | 4,828.5
Accumulated amortization |  | (2,445.5) | (2,228.3)
Net book value |  | $ 2,371.6 | $ 2,600.2
[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.

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