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GOODWILL AND INTANGIBLE ASSETS, NET - Schedule of intangible assets by category (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets    
Intangible assets, net $ 1,813.0 $ 1,902.6
Customer relationships | Weighted Average    
Finite-Lived Intangible Assets    
Weighted average amortization period (in years) 19 years 19 years
Market data customer relationships | Weighted Average    
Finite-Lived Intangible Assets    
Weighted average amortization period (in years) 14 years 14 years
Technology | Weighted Average    
Finite-Lived Intangible Assets    
Weighted average amortization period (in years) 6 years 6 years
Trademarks and tradenames | Weighted Average    
Finite-Lived Intangible Assets    
Weighted average amortization period (in years) 1 year 2 years
Other | Weighted Average    
Finite-Lived Intangible Assets    
Weighted average amortization period (in years) 1 year 2 years
Options    
Finite-Lived Intangible Assets    
Accumulated amortization $ (24.2) $ (15.7)
Intangible assets, net 190.2 198.7
Options | Customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 38.8 38.8
Options | Market data customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 53.6 53.6
Options | Technology    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 24.6 24.6
Options | Trademarks and tradenames    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 1.7 1.7
Options | Other    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 0.2 0.2
Options | Trading registrations and licenses    
Finite-Lived Intangible Assets    
Indefinite-lived intangible assets, gross 95.5 95.5
U.S. Equities    
Finite-Lived Intangible Assets    
Accumulated amortization (115.8) (74.3)
Intangible assets, net 1,030.3 1,071.8
U.S. Equities | Customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 222.9 222.9
U.S. Equities | Market data customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 322.0 322.0
U.S. Equities | Technology    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 22.5 22.5
U.S. Equities | Trademarks and tradenames    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 6.0 6.0
U.S. Equities | Trading registrations and licenses    
Finite-Lived Intangible Assets    
Indefinite-lived intangible assets, gross 572.7 572.7
European Equities    
Finite-Lived Intangible Assets    
Accumulated amortization (30.3) (24.7)
Intangible assets, net 404.5 427.0
European Equities | Customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 167.2 173.7
European Equities | Market data customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 62.7 65.1
European Equities | Technology    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 23.5 24.4
European Equities | Trademarks and tradenames    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 1.9 2.0
European Equities | Trading registrations and licenses    
Finite-Lived Intangible Assets    
Indefinite-lived intangible assets, gross 179.5 186.5
Global FX    
Finite-Lived Intangible Assets    
Accumulated amortization (45.0) (28.5)
Intangible assets, net 183.1 199.6
Global FX | Customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 140.0 140.0
Global FX | Market data customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 64.4 64.4
Global FX | Technology    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 22.5 22.5
Global FX | Trademarks and tradenames    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 1.2 1.2
Corporate and Other    
Finite-Lived Intangible Assets    
Accumulated amortization (3.1) (2.5)
Intangible assets, net 4.9 5.5
Corporate and Other | Customer relationships    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 3.0 3.0
Corporate and Other | Technology    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross 4.0 4.0
Corporate and Other | Trademarks and tradenames    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross   $ 1.0
Corporate and Other | Trading registrations and licenses    
Finite-Lived Intangible Assets    
Indefinite-lived intangible assets, gross $ 1.0