Consolidated Statements of Stockholders' Equity (USD $) In Millions	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss, Net of Tax	Treasury Stock	Total IPG Stockholders' Equity	Noncontrolling Interests
Beginning balance at Dec. 31, 2010	$ 2,566.9	$ 221.5	$ 47.5	$ 2,456.8	$ (63.7)	$ (119.0)	$ (14.1)	$ 2,529.0	$ 37.9
Beginning balance, shares at Dec. 31, 2010			489.5
Net income	551.5				532.3			532.3	19.2
Other comprehensive loss	(109.2)					(106.7)		(106.7)	(2.5)
Noncontrolling interest transactions	(1.6)			0.4	0.6			1.0	(2.6)
Distributions to noncontrolling interests	(23.0)								(23.0)
Change in redemption value of redeemable noncontrolling interests	(14.1)			(10.6)	(3.5)			(14.1)
Repurchase of common stock	(400.8)						(400.8)	(400.8)
Common stock dividends	(111.1)			(56.8)	(54.3)			(111.1)
Preferred stock dividends	(11.6)			(5.8)	(5.8)			(11.6)
Stock-based compensation, shares			1.5
Share-based Compensation	51.7
Stock-based compensation, value	48.7		0.8	47.9				48.7
Exercise of stock options, shares	1.3		1.3
Exercise of stock options, value	12.0		0.1	11.9				12.0
Reclassifications related to redeemable noncontrolling interests	10.4			2.7				2.7	7.7
Shares withheld for taxes, shares			(0.9)
Shares withheld for taxes, value	(27.0)		(0.2)	(26.8)				(27.0)
Operating Income (Loss)	687.2
Loss on Extinguishment of Debt	0
Restructuring and other reorganization-related charges (reversals), net	1.0
Tax effect from stock-based compensation	8.4			8.4				8.4
Other	(2.2)			(0.6)	(0.5)			(1.1)	(1.1)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	(0.1)
Ending balance at Dec. 31, 2011	2,497.3	221.5	48.2	2,427.5	405.1	(225.7)	(414.9)	2,461.7	35.6
Ending balance, shares at Dec. 31, 2011			491.4
Net income	464.6				446.7			446.7	17.9
Other comprehensive loss	(63.4)					(62.3)		(62.3)	(1.1)
Noncontrolling interest transactions	(2.2)								(2.2)
Distributions to noncontrolling interests	(17.0)								(17.0)
Change in redemption value of redeemable noncontrolling interests	2.7				2.7			2.7
Repurchase of common stock	(350.5)						(350.5)	(350.5)
Common stock dividends	(103.4)				(103.4)			(103.4)
Preferred stock dividends	(11.6)				(11.6)			(11.6)
Stock-based compensation, shares			1.6
Share-based Compensation	44.5
Stock-based compensation, value	32.0		0.7	31.3				32.0
Exercise of stock options, shares	1.2		1.1
Exercise of stock options, value	10.9		0.1	10.8				10.9
Reclassifications related to redeemable noncontrolling interests	10.9			12.0				12.0	(1.1)
Shares withheld for taxes, shares			(2.1)
Shares withheld for taxes, value	(23.7)		(0.2)	(23.5)				(23.7)
Operating Income (Loss)	678.3
Loss on Extinguishment of Debt	0
Restructuring and other reorganization-related charges (reversals), net	(1.2)
Tax effect from stock-based compensation	14.8			14.8				14.8
Other	(4.8)			(7.5)	(1.2)			(8.7)	3.9
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	0.4
Ending balance at Dec. 31, 2012	2,456.6	221.5	48.8	2,465.4	738.3	(288.0)	(765.4)	2,420.6	36.0
Ending balance, shares at Dec. 31, 2012			492.0
Net income	288.9				267.9			267.9	21.0
Other comprehensive loss	(127.1)					(123.2)		(123.2)	(3.9)
Noncontrolling interest transactions	1.0			(0.1)				(0.1)	1.1
Distributions to noncontrolling interests	(14.9)								(14.9)
Change in redemption value of redeemable noncontrolling interests	(6.2)				(6.2)			(6.2)
Repurchase of common stock	(481.8)						(481.8)	(481.8)
Common stock dividends	(126.0)				(126.0)			(126.0)
Preferred stock dividends	(8.7)				(8.7)			(8.7)
Conversion of convertible notes to common stock, shares	17.3		16.9
Conversion of convertible notes to common stock, value	200.0		1.7	198.3				200.0
Capped call transaction	0			19.1			(19.1)	0
Conversion of preferred stock to common stock		(221.5)
Conversion of preferred stock to common stock, shares			17.3
Conversion of preferred stock to common stock, value	0		1.7	219.8				0
Stock-based compensation, shares			2.4
Share-based Compensation	43.1		0.5
Stock-based compensation, value	43.6			43.1				43.6
Exercise of stock options, shares	5.2		5.2
Exercise of stock options, value	47.9		0.5	47.4				47.9
Reclassifications related to redeemable noncontrolling interests	(4.4)			0.2					(4.6)
Shares withheld for taxes, shares			(1.5)
Shares withheld for taxes, value	(20.1)		(0.2)	(19.9)				(20.1)
Operating Income (Loss)	598.3
Loss on Extinguishment of Debt	(45.2)
Restructuring and other reorganization-related charges (reversals), net	60.6
Other	2.0			1.9	(0.8)			1.1	0.9
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	0.8
Ending balance at Dec. 31, 2013	$ 2,250.8	$ 0	$ 53.0	$ 2,975.2	$ 864.5	$ (411.2)	$ (1,266.3)	$ 2,215.2	$ 35.6
Ending balance, shares at Dec. 31, 2013			532.3