Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 91.0		$ 16.3
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Share-based compensation	49.9		65.0
Depreciation and amortization	51.6		43.4
Restructuring charges	7.7	[1]	2.0	[1]
Deferred income taxes	15.7		(13.9)
(Gain) loss on investments, net	(2.3)		14.0
Excess tax benefits from share-based compensation	(1.1)		(4.3)
Other non-cash charges	0.3		0.2
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(94.3)		126.5
Prepaid expenses and other assets	(53.6)		(22.3)
Accounts payable	9.1		(126.8)
Accrued compensation	(75.2)		(15.4)
Income taxes payable	(38.4)		(3.8)
Other accrued liabilities	(26.5)		(11.2)
Deferred revenue	57.2		32.6
Net cash (used in) provided by operating activities	(8.9)		102.3
Cash flows from investing activities:
Purchases of property and equipment	(71.5)		(82.0)
Purchases of trading investments	(1.5)		(2.7)
Purchases of available-for-sale investments	(582.2)		(371.2)
Proceeds from sales of available-for-sale investments	331.8		231.4
Proceeds from maturities of available-for-sale investments	54.0		222.8
Payments for business acquisitions, net of cash and cash equivalents acquired	(10.0)		(90.5)
Proceeds from sales of privately-held investments	1.6		0
Purchases of privately-held investments	(7.3)		(1.1)
Net cash used in investing activities	(285.1)		(93.3)
Cash flows from financing activities:
Proceeds from issuance of common stock	65.0		37.8
Purchases and retirement of common stock	(132.5)		(56.1)
Payment for capital lease obligation	(1.4)		0
Change in customer financing arrangements	(2.3)		7.7
Excess tax benefits from share-based compensation	1.1		4.3
Net cash used in financing activities	(70.1)		(6.3)
Net (decrease) increase in cash and cash equivalents	(364.1)		2.7
Cash and cash equivalents at beginning of period	2,407.8		2,910.4
Cash and cash equivalents at end of period	$ 2,043.7		$ 2,913.1

[1] Amount includes restructuring charges reported in operating expenses and in cost of revenues.