Consolidated Statements of Comprehensive Loss (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
NET LOSS	$ (22.4)		$ (58.5)
OTHER COMPREHENSIVE LOSS
Foreign currency translation adjustments	(1.0)		(38.8)
Less: reclassification adjustments recognized in net loss	(0.9)		0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(1.9)		(38.8)
Available-for-sale securities:
Changes in market value of available-for sale securities	0.1		0.4
Less: recognition of previously unrealized gains included in net loss	0		(1.0)
Income tax effect	0		0.1
Available-for-sale securities, net of tax	0.1		(0.5)
Derivative instruments:
Changes in fair value of derivative instruments	(0.6)		0
Less: recognition of previously unrealized losses included in net loss	0.4		0.4
Income tax effect	0.1		(0.2)
Derivative instruments, net of tax	(0.1)		0.2
Defined benefit pension and other postretirement plans:
Net actuarial gains for the period	(0.3)		(1.1)
Less: amortization of unrecognized losses, transition obligation and prior service cost included in net loss	2.6	[1]	2.8	[1]
Other	(0.1)		(0.5)
Income tax effect	(0.6)		(0.7)
Defined benefit pension and other postretirement plans, net of tax	1.6		0.5
Other comprehensive loss, net of tax	(0.3)		(38.6)
TOTAL COMPREHENSIVE LOSS	(22.7)		(97.1)
Less: comprehensive loss attributable to noncontrolling interests	(2.1)		(3.4)
COMPREHENSIVE LOSS ATTRIBUTABLE TO IPG	$ (20.6)		$ (93.7)

[1] These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 10 for further information.