v3.5.0.2
Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Oct. 03, 2016
Dec. 14, 2015
Dec. 11, 2015
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill acquired       $ 12,009.0 $ 12,079.0
Interactive Data Holdings Corporation Acquisition [Member]          
Business Acquisition [Line Items]          
Net assets acquired   $ 273.0      
Goodwill acquired   3,228.0      
Business Combination, Consideration Transferred   6,000.0      
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   $ 6.5      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred       23.0  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities       6.0  
Goodwill, Purchase Accounting Adjustments       28.0  
Business Acquisition, Percentage of Voting Interests Acquired   100.00%      
TRAYPORT [Member]          
Business Acquisition [Line Items]          
Net assets acquired     $ 8.0    
Goodwill acquired     388.0    
Business Combination, Consideration Transferred     620.0    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     $ 2.5    
Business Acquisition, Percentage of Voting Interests Acquired     100.00%    
Data/Databases [Member] | Interactive Data Holdings Corporation Acquisition [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Assets, Purchase Accounting Adjustments       33.0  
Trademarks and Trade Names [Member] | Interactive Data Holdings Corporation Acquisition [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Assets, Purchase Accounting Adjustments       21.0  
Customer Relationships [Member] | Interactive Data Holdings Corporation Acquisition [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Assets, Purchase Accounting Adjustments       $ 17.0  
Senior Notes [Member] | Interactive Data Holdings Corporation Acquisition [Member]          
Business Acquisition [Line Items]          
Proceeds from Issuance of Debt   $ 2,500.0      
Revolving Credit Facility [Member] | Interactive Data Holdings Corporation Acquisition [Member]          
Business Acquisition [Line Items]          
Proceeds from Lines of Credit   $ 1,600.0     $ 1,600.0
Subsequent Event [Member] | SPSE and CMA [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred $ 431.0