Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue
Revenue	$ 1,865.5	$ 1,841.1	$ 5,417.6	$ 5,330.0
Operating Expenses:
Salaries and related expenses	1,202.2	1,195.2	3,622.6	3,554.0
Office and general expenses	471.4	474.6	1,379.5	1,420.6
Total operating expenses	1,673.6	1,669.8	5,002.1	4,974.6
OPERATING INCOME	191.9	171.3	415.5	355.4
Expenses and Other Income:
Interest expense	(21.3)	(20.7)	(62.5)	(63.5)
Interest income	5.6	7.5	17.8	20.3
Other expense, net	(37.2)	(0.6)	(36.4)	(10.1)
Total (expenses) and other income	(52.9)	(13.8)	(81.1)	(53.3)
Income before income taxes	139.0	157.5	334.4	302.1
Provision for income taxes	61.1	65.0	137.4	128.6
Income of consolidated companies	77.9	92.5	197.0	173.5
Equity in net income of unconsolidated affiliates	0.1	0.3	0.6	0.6
NET INCOME	78.0	92.8	197.6	174.1
Net income attributable to noncontrolling interests	(3.1)	(3.1)	(3.3)	(5.9)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ 74.9	$ 89.7	$ 194.3	$ 168.2
Earnings Per Share, Basic	$ 0.18	$ 0.21	$ 0.47	$ 0.40
Earnings Per Share, Diluted	$ 0.18	$ 0.21	$ 0.47	$ 0.39
Weighted Average Number of Shares Outstanding, Basic	407.6	419.2	409.7	421.0
Weighted Average Number of Shares Outstanding, Diluted	415.5	426.4	417.0	427.2
Dividends declared per common share	$ 0.120	$ 0.095	$ 0.360	$ 0.285