Nature of Operations and Basis of Presentation (Details) $ in Billions	1 Months Ended	6 Months Ended
	Feb. 29, 2016 business	Jun. 30, 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 | S&P Global Platts | Disposal Group, Held-for-sale, Not Discontinued Operations
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