Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 188.9		$ 74.0
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	111.4		126.8
Depreciation and amortization	93.7		89.9
Restructuring charges	16.5	[1]	5.2	[1]
Deferred income taxes	26.6		(23.1)
Gain on investments, net	(3.8)		(0.8)
Excess tax benefits from share-based compensation	(1.3)		(6.8)
Other non-cash charges	1.0		0.4
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(92.3)		170.7
Prepaid expenses and other assets	(86.9)		(46.5)
Accounts payable	(3.4)		(137.5)
Accrued compensation	(64.0)		21.4
Income taxes payable	(18.5)		17.2
Other accrued liabilities	3.1		(2.4)
Deferred revenue	104.5		25.9
Net cash provided by operating activities	275.5		314.4
Cash flows from investing activities:
Purchases of property and equipment	(142.3)		(169.7)
Purchases of trading investments	(2.1)		(3.2)
Purchases of available-for-sale investments	(895.0)		(614.8)
Proceeds from sales of available-for-sale investments	587.5		399.7
Proceeds from maturities of available-for-sale investments	183.8		371.6
Payments for business acquisitions, net of cash and cash equivalents	(10.0)		(90.5)
Proceeds from sales of privately-held investments	1.7		19.8
Purchases of privately-held investments	(14.4)		(6.1)
Purchase of licensed software	(10.0)		(0.3)
Changes in restricted cash	0		(0.2)
Net cash used in investing activities	(300.8)		(93.7)
Cash flows from financing activities:
Proceeds from issuance of common stock	74.3		49.8
Purchases and retirement of common stock	(239.2)		(150.1)
Payment for capital lease obligation	(1.4)		(1.4)
Customer financing arrangements	32.4		8.1
Excess tax benefits from share-based compensation	1.3		6.8
Net cash used in financing activities	(132.6)		(86.8)
Net (decrease) increase in cash and cash equivalents	(157.9)		133.9
Cash and cash equivalents at beginning of period	2,407.8		2,910.4
Cash and cash equivalents at end of period	$ 2,249.9		$ 3,044.3

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