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Acquisitions - Allocation of Purchase Price (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 05, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 3,279.9   $ 2,956.1 $ 2,888.4
NYX        
Business Acquisition [Line Items]        
Cash, cash equivalents and restricted cash   $ 23.3    
Accounts receivable and other current assets   55.8    
Property and equipment and other non-current assets   22.1    
Goodwill   368.3    
Intangible assets   350.0    
Total assets   819.5    
Current liabilities   74.5    
Deferred income taxes   66.3    
Assumed debt and other liabilities   299.7    
Total liabilities   440.5    
Total consideration transferred   379.0    
Receivables   40.5    
Contract assets   12.9    
Contract liabilities   $ 15.7