CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net income	$ 351.2	$ 347.8
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	45.6	39.5
Stock-based compensation expense	29.9	30.3
Deferred income taxes	47.5	5.8
Excess tax benefits from stock-based compensation plans	(9.2)	(5.9)
Legacy Tax Matters		(6.4)
Changes in assets and liabilities:
Accounts receivable	(40.5)	11.2
Other current assets	(32.4)	71.6
Other assets	(3.2)	(1.3)
Accounts payable and accrued liabilities	(115.8)	(78.0)
Restructuring		(0.2)
Deferred revenue	45.6	20.5
Unrecognized tax benefits	(73.9)	6.4
Other liabilities	(9.3)	4.6
Net cash provided by operating activities	235.5	445.9
Cash flows from investing activities
Capital additions	(21.9)	(35.6)
Purchases of short-term investments	(24.7)	(16.6)
Sales and maturities of short-term investments	24.2	18.9
Cash paid for acquisitions	(3.5)	(7.1)
Net cash used in investing activities	(25.9)	(40.4)
Cash flows from financing activities
Repayments of notes	(7.5)	(3.8)
Net proceeds from stock-based compensation plans	34.9	35.1
Cost of treasury shares repurchased	(100.0)	(127.6)
Excess tax benefits from stock-based compensation plans	9.2	5.9
Payment of dividends	(71.6)	(58.2)
Payment of dividends to noncontrolling interests	(4.5)	(4.5)
Contingent consideration paid	(0.5)
Debt issuance costs and related fees	(2.5)
Net cash used in financing activities	(142.5)	(153.1)
Effect of exchange rate changes on cash and cash equivalents	(3.0)	26.5
Net increase in cash and cash equivalents	64.1	278.9
Cash and cash equivalents, beginning of the period	760.0	659.6
Cash and cash equivalents, end of the period	$ 824.1	$ 938.5