Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUE:
Net revenue	$ 2,125.9	$ 1,948.2	$ 4,130.7	$ 3,722.2
Billable expenses	394.3	443.6	750.7	838.7
Total revenue	2,520.2	2,391.8	4,881.4	4,560.9
OPERATING EXPENSES:
Salaries and related expenses	1,381.2	1,292.9	2,802.3	2,623.2
Office and other direct expenses	387.3	333.3	776.5	657.1
Billable expenses	394.3	443.6	750.7	838.7
Cost of services	2,162.8	2,069.8	4,329.5	4,119.0
Selling, general and administrative expenses	18.1	28.8	59.5	63.9
Depreciation and amortization	73.0	44.0	144.1	90.0
Restructuring charges	2.1	0.0	33.9
Total operating expenses	2,256.0	2,142.6	4,567.0	4,272.9
OPERATING INCOME	264.2	249.2	314.4	288.0
EXPENSES AND OTHER INCOME:
Interest expense	(51.6)	(26.1)	(101.4)	(46.0)
Interest income	7.7	4.7	15.5	8.7
Other expense, net	(3.8)	(16.3)	(10.7)	(40.7)
Total (expenses) and other income	(47.7)	(37.7)	(96.6)	(78.0)
Income before income taxes	216.5	211.5	217.8	210.0
Provision for income taxes	43.6	63.6	54.1	76.3
Income of consolidated companies	172.9	147.9	163.7	133.7
Equity in net loss of unconsolidated affiliates	(0.1)	(0.1)	(0.4)	(2.0)
NET INCOME	172.8	147.8	163.3	131.7
Net income attributable to noncontrolling interests	(3.3)	(2.0)	(1.8)	(0.0)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ 169.5	$ 145.8	$ 161.5	$ 131.7
Earnings per share, Basic	$ 0.44	$ 0.38	$ 0.42	$ 0.34
Earnings per share, Diluted	$ 0.43	$ 0.37	$ 0.41	$ 0.34
Weighted-average number of common shares outstanding, Basic	386.2	383.6	385.4	383.5
Weighted-average number of common shares outstanding, Diluted	391.2	389.5	390.1	388.9