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Description of the Business and Summary of Significant Accounting Policies - Aggregate Business Acquisitions Completed (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 23, 2018
Jan. 05, 2018
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Preliminary Purchase Price Allocation Summary            
Goodwill     $ 3,372.5 $ 3,372.5   $ 2,956.1
Intangible assets acquired, royalty rate     0.50%      
Minimum            
Preliminary Purchase Price Allocation Summary            
Intangible assets acquired, discount rate     10.00%      
Maximum            
Preliminary Purchase Price Allocation Summary            
Intangible assets acquired, discount rate     14.00%      
NYX            
Business Acquisition [Line Items]            
Payments to acquire business   $ 665.8        
Fair value of shares acquired   91.9        
Fair value of non-controlling equity interest   90.4        
Acquisition related costs     $ 7.7      
Preliminary Purchase Price Allocation Summary            
Cash, cash equivalents and restricted cash   23.3        
Accounts receivables and other current assets   55.2        
Property and equipment and other non-current assets   22.1        
Goodwill   376.4        
Intangible assets   350.0        
Total assets   827.0        
Current liabilities   82.0        
Deferred income taxes   66.3        
Assumed debt and other liabilities   299.7        
Total liabilities   448.0        
Total consideration transferred   379.0        
Receivables acquired   43.0        
Contract assets acquired   12.9        
Assumed contract liabilities   15.7        
Details of Total Intangible Assets            
Revenue since acquisition       49.2    
Earnings since acquisition       $ 7.4    
Unaudited Pro Forma Financial Information            
Revenue     811.8   $ 768.7  
Net loss     $ 194.1   $ 115.9  
Tech Art            
Unaudited Pro Forma Financial Information            
Total Consideration $ 9.6          
Tech Art | Intellectual property            
Details of Total Intangible Assets            
Weighted Average Useful Life (Years) 15 years          
Level 3 | NYX | Customer relationships            
Details of Total Intangible Assets            
Fair Value   214.0        
Level 3 | NYX | Intellectual property            
Details of Total Intangible Assets            
Fair Value   $ 126.5        
Weighted Average Useful Life (Years)   7 years        
Level 3 | NYX | Brand names            
Details of Total Intangible Assets            
Fair Value   $ 9.5        
Weighted Average Useful Life (Years)   7 years        
Level 3 | NYX | Minimum | Customer relationships            
Details of Total Intangible Assets            
Weighted Average Useful Life (Years)   7 years        
Level 3 | NYX | Maximum | Customer relationships            
Details of Total Intangible Assets            
Weighted Average Useful Life (Years)   7 years