Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 110.6	$ 91.0
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Share-based compensation expense	60.8	49.9
Depreciation, amortization, and accretion	48.1	51.8
Restructuring and other charges	122.4	7.7
Deferred income taxes	(44.5)	15.7
Gain on investments, net	(166.2)	(2.3)
Excess tax benefits from share-based compensation	(6.7)	(1.1)
Loss on disposal of fixed assets	0.8	0.1
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(15.7)	(94.3)
Prepaid expenses and other assets	35.5	(53.6)
Accounts payable	19.2	9.1
Accrued compensation	(92.0)	(75.2)
Income taxes payable	21.2	(38.4)
Other accrued liabilities	(50.3)	(26.5)
Deferred revenue	82.8	57.2
Net cash provided by (used in) operating activities	126.0	(8.9)
Cash flows from investing activities:
Purchases of property and equipment	(57.3)	(71.5)
Purchases of available-for-sale investments	(327.1)	(582.2)
Proceeds from sales of available-for-sale investments	1,221.4	331.8
Proceeds from maturities of available-for-sale investments	79.3	54.0
Purchases of trading investments	(1.8)	(1.5)
Proceeds from sales of privately-held investments	2.5	1.6
Purchases of privately-held investments	(1.7)	(7.3)
Payments for business acquisitions, net of cash and cash equivalents acquired	(27.1)	(10.0)
Changes in restricted cash	25.0	0
Net cash provided by (used in) investing activities	913.2	(285.1)
Cash flows from financing activities:
Proceeds from issuance of common stock	101.2	65.0
Purchases and retirement of common stock	(905.8)	(132.5)
Purchase of equity forward contract	(300.0)	0
Issuance of long-term debt, net	346.5	0
Payment for capital lease obligation	(0.4)	(1.4)
Customer financing arrangements	8.0	(2.3)
Excess tax benefits from share-based compensation	6.7	1.1
Net cash used in financing activities	(743.8)	(70.1)
Net increase (decrease) in cash and cash equivalents	295.4	(364.1)
Cash and cash equivalents at beginning of period	2,284.0	2,407.8
Cash and cash equivalents at end of period	$ 2,579.4	$ 2,043.7