Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities
Net income	$ 738.6	$ 1,067.7
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	48.8	37.5
Amortization of purchased intangibles	90.3	99.2
Depreciation and amortization	103.0	95.1
Amortization of debt financing costs and discount accretion	3.3	3.9
Gain on sale of Index Services assets	0	(9.8)
Gain on contribution of Dow Jones Index Asset Group	(79.8)	0
Loss on sale of Credit Market Analysis Ltd.	19.9	0
Equity in net (gains) losses of unconsolidated subsidiaries	(14.8)	3.1
Deferred income taxes	67.6	(130.8)
Change in:
Accounts receivable	(32.4)	(72.5)
Other current assets	(36.1)	(15.1)
Other assets	(19.2)	(10.9)
Accounts payable	14.0	(11.3)
Income taxes payable	23.3	(16.1)
Other current liabilities	(41.7)	(55.5)
Other liabilities	12.0	14.7
Other	0.4	0.6
Net Cash Provided by Operating Activities	897.2	999.8
Cash Flows from Investing Activities
Proceeds from maturities of available-for-sale marketable securities	15.4	6.0
Purchases of available-for-sale marketable securities	(23.5)	(5.1)
Purchases of property	(103.9)	(129.4)
Proceeds from sale of building property	151.5	0
Proceeds from sale of Credit Market Analysis Ltd., net of cash sold with business	42.4	0
Investments in business ventures	(107.1)	0
Settlement of derivative related to debt issuance	(24.4)	0
Proceeds from sale of Index Services assets	0	18.0
Other	0	(0.5)
Net Cash Used in Investing Activities	(49.6)	(111.0)
Cash Flows from Financing Activities
Proceeds from other borrowings, net of issuance costs	747.7	0
Repayment of other borrowings	0	(420.5)
Cash dividends	(644.3)	(280.6)
Repurchase of Class A common stock, including costs	0	(220.4)
Proceeds from exercise of stock options	19.2	5.2
Excess tax benefits related to employee option exercises and restricted stock vesting	3.7	0.7
Other	0.7	0.9
Net Cash Used in Financing Activities	127.0	(914.7)
Net change in cash and cash equivalents	974.6	(25.9)
Cash and cash equivalents, beginning of period	1,042.3	855.2
Cash and Cash Equivalents, End of Period	2,016.9
Supplemental Disclosure of Cash Flow Information
Income taxes paid	517.1	612.1
Interest paid	110.6	111.9
Non-cash investing activities:
Investment in S&P/Dow Jones Indices LLC	878.4
Change in net unrealized securities gains	84.4	122.6
Change in net unrealized derivative gains (losses)	$ (30.1)	$ 0.4