Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 1,913.3	$ 3,796.0	$ 3,002.2
Short-term investments, at cost	5.4	0.4
Accounts receivable, net of allowance for doubtful accounts of $24.7 and $32.1	6,760.5	8,083.8
Work in process	1,353.5	1,110.6
Other current assets	1,197.4	1,125.2
Total Current Assets	11,230.1	14,116.0
Property and Equipment at cost, less accumulated depreciation of $1,275.8 and $1,279.2	697.2	690.9
Equity Method Investments	120.3	120.3
Goodwill	9,442.6	9,337.5	8,976.1
Intangible Assets, net of accumulated amortization of $727.1 and $879.9	377.7	368.4
Other Assets	301.6	298.1
TOTAL ASSETS	22,169.5	24,931.2
Current Liabilities:
Accounts payable	9,568.1	11,574.6
Customer advances	1,147.1	1,266.7
Short-term debt	20.8	11.8
Taxes payable	263.4	330.0
Other current liabilities	1,618.5	1,925.8
Total Current Liabilities	12,617.9	15,108.9
Long-Term Debt	4,866.8	4,912.9
Long-Term Liabilities	1,196.4	1,091.2
Deferred Tax Liabilities	451.0	483.6
Commitments and Contingent Liabilities (Note 11)
Temporary Equity - Redeemable Noncontrolling Interests	178.5	182.4
Shareholders’ Equity:
Preferred stock	0.0	0.0
Common stock	44.6	44.6
Additional paid-in capital	811.5	828.3
Retained earnings	6,587.7	6,210.6
Accumulated other comprehensive income (loss)	(1,167.3)	(963.0)	$ (1,356.0)
Treasury stock, at cost	(3,955.1)	(3,505.4)
Total Shareholders’ Equity	2,321.4	2,615.1
Noncontrolling interests	537.5	537.1
Total Equity	2,858.9	3,152.2
TOTAL LIABILITIES AND EQUITY	$ 22,169.5	$ 24,931.2