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ACQUISITIONS - Intangible assets acquired (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Aug. 04, 2020 | Jul. 01, 2020 | Jun. 01, 2020 | Feb. 03, 2020
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Hanweck |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 14.0
FT Options |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | 6.3
Trade Alert |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  | $ 2.0 |
EuroCCP |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 32.3 |  |
MATCHNow |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 36.7 |  |  |
BIDS Holdings |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired | $ 156.4 |  |  |  |
Customer relationships | Hanweck |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 4.9
Useful Life (Years) |  |  |  |  | 13 years
Customer relationships | FT Options |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 2.2
Useful Life (Years) |  |  |  |  | 13 years
Customer relationships | Trade Alert |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  | $ 0.7 |
Useful Life (Years) |  |  |  | 13 years |
Customer relationships | MATCHNow |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 17.4 |  |  |
Useful Life (Years) |  | 15 years |  |  |
Customer relationships | BIDS Holdings |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired | $ 137.0 |  |  |  |
Useful Life (Years) | 17 years |  |  |  |
Technology | Hanweck |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 2.1
Useful Life (Years) |  |  |  |  | 4 years
Technology | FT Options |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 0.9
Useful Life (Years) |  |  |  |  | 4 years
Technology | Trade Alert |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  | $ 0.3 |
Useful Life (Years) |  |  |  | 4 years |
Technology | EuroCCP |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 3.6 |  |
Useful Life (Years) |  |  | 6 years |  |
Technology | MATCHNow |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 0.7 |  |  |
Useful Life (Years) |  | 7 years |  |  |
Technology | BIDS Holdings |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired | $ 17.8 |  |  |  |
Useful Life (Years) | 11 years |  |  |  |
Trademarks and tradenames | Hanweck |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 7.0
Useful Life (Years) |  |  |  |  | 10 years
Trademarks and tradenames | FT Options |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  |  | $ 3.2
Useful Life (Years) |  |  |  |  | 10 years
Trademarks and tradenames | Trade Alert |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  |  | $ 1.0 |
Useful Life (Years) |  |  |  | 10 years |
Trademarks and tradenames | EuroCCP |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 0.6 |  |
Useful Life (Years) |  |  | 10 years |  |
Trademarks and tradenames | MATCHNow |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired |  | $ 0.2 |  |  |
Useful Life (Years) |  | 2 years |  |  |
Trademarks and tradenames | BIDS Holdings |  |  |  |  |
Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired | $ 1.6 |  |  |  |
Useful Life (Years) | 10 years |  |  |  |
Trading registrations and licenses | EuroCCP |  |  |  |  |
Acquisitions |  |  |  |  |
Indefinite-lived intangible assets acquired |  |  | $ 28.1 |  |
Trading registrations and licenses | MATCHNow |  |  |  |  |
Acquisitions |  |  |  |  |
Indefinite-lived intangible assets acquired |  | $ 18.4 |  |  |

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