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ACQUISITIONS - Fair values of assets acquired and liabilities assumed (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Feb. 28, 2017
Acquisitions      
Goodwill $ 2,701.3 $ 2,707.4  
Bats Global Markets, Inc.      
Acquisitions      
Cash and cash equivalents     $ 130.1
Accounts receivable     117.8
Financial investments     66.0
Property and equipment     21.8
Other assets     32.8
Goodwill     2,653.3
Intangibles     2,000.0
Accounts payable     (33.7)
Accrued expenses     (26.2)
Section 31 fees payable     (143.6)
Income tax payable     (52.9)
Deferred tax liability     (722.6)
Other liabilities     (82.6)
Fair value of assets acquired and liabilities assumed     3,960.2
Goodwill expected to be deductible for tax purposes     $ 0.0