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Nature of Operations and Basis of Presentation (Details)
$ in Billions
1 Months Ended 3 Months Ended
Feb. 29, 2016
business
Mar. 31, 2016
Segment
Apr. 30, 2016
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Number of reportable segments (in segments) | Segment   4  
J.D. Power | C&C | Disposal Group, Held-for-sale, Not Discontinued Operations | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Consideration for sale of business | $     $ 1.1
SPSE and CMA | S&P Global Market Intelligence | Disposal Group, Held-for-sale, Not Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of businesses to be sold | business 2