CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 1,007.7	$ 275.8	$ 949.6
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	158.3	126.7	113.5
Stock-based compensation expense	122.9	98.1	87.2
CCXI gains	(59.7)
Purchase price hedge gain	(111.1)
FX gain relating to liquidation/sale of subsidiaries		(36.6)
Deferred income taxes	88.3	(153.1)	18.1
Legacy tax matters		(1.6)	(6.4)
Changes in assets and liabilities:
Accounts receivable	(148.1)	(104.8)	(25.4)
Other current assets	(70.3)	37.0	(28.9)
Other assets	12.1	6.6	(13.1)
Accounts payable and accrued liabilities	(651.4)	908.7	51.4
Deferred revenue	72.9	74.9	31.6
Unrecognized tax benefits and other non-current tax liabilities	63.0	2.2	(10.9)
Other liabilities	262.9	25.3	31.4
Net cash provided by operating activities	747.5	1,259.2	1,198.1
Cash flows from investing activities
Capital additions	(90.6)	(115.2)	(89.0)
Purchases of investments	(170.1)	(379.9)	(688.2)
Sales and maturities of investments	238.5	699.5	653.1
Receipts from purchase price hedge	111.1
Cash paid for acquisitions and investment in affiliates, net of cash acquired	(3,511.0)	(80.8)	(7.6)
Receipts from settlement of net investment hedges	2.1	3.8	39.7
Payments for settlements of net investment hedges		(26.9)
Cash received upon diposal of a subsidiary, net of cash transferred to purchaser		1.5
Net cash provided by (used in) investing activities	(3,420.0)	102.0	(92.0)
Cash flows from financing activities
Issuance of notes	2,291.9		852.8
Repayment of notes	(300.0)
Issuance of commercial paper	1,837.1
Repayments of commercial paper	(1,707.2)
Proceeds from stock-based compensation plans	55.6	77.8	89.2
Repurchase of shares related to stock-based compensation	(48.8)	(44.4)	(59.5)
Treasury shares	(199.7)	(738.8)	(1,098.1)
Dividends	(290.4)	(285.1)	(272.1)
Dividends to noncontrolling interests	(3.2)	(6.7)	(6.8)
Payment for noncontrolling interest	(8.5)	(45.4)
Contingent consideration		(0.2)	(1.5)
Debt issuance costs and related fees	(19.6)	(0.1)	(9.5)
Net cash used in financing activities	1,607.2	(1,042.9)	(505.5)
Effect of exchange rate changes on cash and cash equivalents	85.3	(24.2)	(62.7)
Increase (decrease) in cash and cash equivalents	(980.0)	294.1	537.9
Cash and cash equivalents, beginning of period	2,051.5	1,757.4	1,219.5
Cash and cash equivalents, end of period	$ 1,071.5	$ 2,051.5	$ 1,757.4

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- Definition

The cash inflow associated with the amount received from the stock plan during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash outflow due to repaying amounts borrowed by issuing commercial paper.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

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-SubTopic 10
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- 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

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