Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities:
Net income	$ 713.8	$ 690.9
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation (including amortization of technology projects)	95.0	91.3
Amortization of intangibles	45.1	32.0
Amortization of prepublication costs	164.5	207.2
Provision for losses on accounts receivable	4.9	11.5
Deferred income taxes	(4.8)	(23.4)
Stock-based compensation	64.8	44.8
Other	12.9	(4.5)
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions:
Accounts receivable	(146.9)	(165.3)
Inventories	(11.9)	6.6
Prepaid and other current assets	(3.4)	5.8
Accounts payable and accrued expenses	(174.2)	(4.2)
Unearned revenue	23.7	2.2
Other current liabilities	(50.6)	(9.8)
Net change in prepaid/accrued income taxes	288.4	181.5
Net change in other assets and liabilities	16.3	(13.3)
Cash provided by operating activities	1,037.6	1,053.3
Investing Activities:
Investment in prepublication costs	(105.1)	(99.3)
Capital expenditures	(69.6)	(65.3)
Acquisitions, including contingent payments, net of cash acquired	(198.9)	(325.0)
Proceeds from dispositions	21.4	30.6
Changes in short-term investments	(14.0)	(8.2)
Cash used for investing activities	(366.2)	(467.2)
Financing Activities:
Dividends paid to shareholders	(224.7)	(221.3)
Dividends paid to noncontrolling interests	(10.9)	(16.8)
Repurchase of treasury shares	(635.6)	(255.8)
Exercise of stock options	115.0	28.6
Excess tax benefits from share-based payments	3.3	1.3
Cash used for financing activities	(752.9)	(464.0)
Effect of exchange rate changes on cash	(6.5)	(9.2)
Net change in cash and equivalents	(88.0)	112.9
Cash and equivalents at beginning of period	1,525.6	1,209.9
Cash and equivalents at end of period	$ 1,437.6	$ 1,322.8