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GOODWILL AND INTANGIBLE ASSETS, NET - Itangible assets by category (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Intangible Assets |  |  |
Intangible assets, net | $ 1,668.6 | $ 1,729.0 | $ 1,589.9
Customer relationships | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 17 years | 16 years |
Market data customer relationships | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 10 years | 11 years |
Technology | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 5 years | 5 years |
Trademarks and tradenames | Weighted Average |  |  |
Intangible Assets |  |  |
Amortization period (in years) | 8 years | 9 years |
Options |  |  |
Intangible Assets |  |  |
Accumulated amortization | $ (77.6) | $ (63.3) |
Intangible assets, net | 159.1 | 173.4 | 166.6
Options | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 46.6 | 46.6 |
Options | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 53.6 | 53.6 |
Options | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 28.1 | 28.1 |
Options | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 12.9 | 12.9 |
Options | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 95.5 | 95.5 |
North American Equities |  |  |
Intangible Assets |  |  |
Accumulated amortization | (349.8) | (285.7) |
Intangible assets, net | 991.4 | 1,055.5 | 921.4
North American Equities | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 378.3 | 378.3 |
North American Equities | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 322.0 | 322.0 |
North American Equities | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 41.1 | 41.1 |
North American Equities | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 7.8 | 7.8 |
North American Equities | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 592.0 | 592.0 |
Europe and Asia Pacific |  |  |
Intangible Assets |  |  |
Accumulated amortization | (130.3) | (105.3) |
Intangible assets, net | 426.4 | 386.8 | 363.7
Europe and Asia Pacific | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 232.3 | 175.7 |
Europe and Asia Pacific | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 65.2 | 65.9 |
Europe and Asia Pacific | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 35.6 | 28.6 |
Europe and Asia Pacific | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 2.5 | 2.6 |
Europe and Asia Pacific | Trading registrations and licenses |  |  |
Intangible Assets |  |  |
Indefinite-lived intangible assets, gross | 221.1 | 219.3 |
Global FX |  |  |
Intangible Assets |  |  |
Accumulated amortization | (136.4) | (114.8) |
Intangible assets, net | 91.7 | 113.3 | $ 138.2
Global FX | Customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 140.0 | 140.0 |
Global FX | Market data customer relationships |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 64.4 | 64.4 |
Global FX | Technology |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | 22.5 | 22.5 |
Global FX | Trademarks and tradenames |  |  |
Intangible Assets |  |  |
Finite-lived intangible assets, gross | $ 1.2 | $ 1.2 |

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