Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 374.7	$ 454.3
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	180.2	151.1
Depreciation, amortization, and accretion	159.2	169.7
Other	3.5	(6.7)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	200.9	331.9
Prepaid expenses and other assets	43.9	51.2
Accounts payable	(27.6)	(11.5)
Accrued compensation	(4.2)	(60.6)
Income taxes payable	(244.0)	8.8
Other accrued liabilities	(14.5)	(20.3)
Deferred revenue	(23.4)	(21.2)
Net cash provided by operating activities	648.7	1,046.7
Cash flows from investing activities:
Purchases of property and equipment	(110.9)	(97.6)
Purchases of available-for-sale debt securities	(608.1)	(1,298.6)
Proceeds from sales of available-for-sale debt securities	1,012.2	761.2
Proceeds from maturities and redemptions of available-for-sale debt securities	446.6	521.3
Purchases of equity securities	(8.1)	(13.7)
Proceeds from sales of equity securities	29.8	1.3
Proceeds from Pulse note receivable	0.0	75.0
Payment of escrow balance related to prior year acquisitions	(31.5)	0.0
Payments for business acquisitions, net of cash and cash equivalents acquired	0.0	(27.0)
Net cash provided by (used in) investing activities	730.0	(78.1)
Cash flows from financing activities:
Repurchase and retirement of common stock	(755.5)	(395.5)
Proceeds from issuance of common stock	56.8	64.4
Payment of dividends	(187.0)	(113.5)
Change in customer financing arrangement	(16.9)	0.0
Other	(1.5)	0.0
Net cash used in financing activities	(904.1)	(444.6)
Effect of foreign currency exchange rates on cash, cash equivalents, and restricted cash	(10.9)	13.3
Net increase in cash, cash equivalents, and restricted cash	463.7	537.3
Cash, cash equivalents, and restricted cash at beginning of period	2,059.1	1,880.6
Cash, cash equivalents, and restricted cash at end of period	$ 2,522.8	$ 2,417.9

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration