Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (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 loss	(53.2)				(45.2)			(45.2)	(8.0)
Other comprehensive income	45.4					45.2		45.2	0.2
Reclassifications related to redeemable noncontrolling interests	11.2								11.2
Noncontrolling interest transactions	(3.3)			(0.1)				(0.1)	(3.2)
Distributions to noncontrolling interests	(3.1)								(3.1)
Change in redemption value of redeemable noncontrolling interests	(9.4)			(9.4)				(9.4)
Repurchase of common stock	(10.5)						(10.5)	(10.5)
Common stock dividends	(28.5)			(28.5)				(28.5)
Preferred stock dividends	(2.9)			(2.9)				(2.9)
Stock-based compensation, shares			0.6
Stock-based compensation	16.7		0.1	16.6				16.7
Exercise of stock options, shares			0.9
Exercise of stock options	8.5		0.1	8.4				8.5
Shares withheld for taxes, shares			(0.1)
Shares withheld for taxes	(5.2)		0	(5.2)				(5.2)
Other	0.2			0.3				0.3	(0.1)
Ending balance at Mar. 31, 2011	2,532.8	221.5	47.7	2,436.0	(108.9)	(73.8)	(24.6)	2,497.9	34.9
Ending balance, shares at Mar. 31, 2011			490.9
Beginning 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
Beginning balance, shares at Dec. 31, 2011			491.4
Net loss	(45.7)				(43.0)			(43.0)	(2.7)
Other comprehensive income	44.4					43.9		43.9	0.5
Reclassifications related to redeemable noncontrolling interests	16.9			13.0				13.0	3.9
Noncontrolling interest transactions	(0.8)								(0.8)
Distributions to noncontrolling interests	(1.8)								(1.8)
Change in redemption value of redeemable noncontrolling interests	3.3				3.3			3.3
Repurchase of common stock	(52.5)						(52.5)	(52.5)
Common stock dividends	(26.2)				(26.2)			(26.2)
Preferred stock dividends	(2.9)				(2.9)			(2.9)
Stock-based compensation, shares			(0.1)
Stock-based compensation	14.0		0.6	13.4				14.0
Exercise of stock options, shares			0.4
Exercise of stock options	5.0		0.1	4.9				5.0
Shares withheld for taxes, shares			(0.1)
Shares withheld for taxes	(22.7)		(0.2)	(22.5)				(22.7)
Other	(0.2)			0.9	(0.6)			0.3	(0.5)
Ending balance at Mar. 31, 2012	$ 2,428.1	$ 221.5	$ 48.7	$ 2,437.2	$ 335.7	$ (181.8)	$ (467.4)	$ 2,393.9	$ 34.2
Ending balance, shares at Mar. 31, 2012			491.6