Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Consolidated net loss	$ (53.3)	$ (8.8)
Less: net income attributable to noncontrolling interest	0.3	1.8
Net loss attributable to Axiall	(53.6)	(10.6)
Other comprehensive income (loss):
Foreign currency translation adjustments	28.7	(35.0)
Derivative cash flow hedges	(0.1)	9.0
Pension and OPEB plan liability adjustments	(2.2)	(1.2)
Other comprehensive income (loss), before income taxes	26.4	(27.2)
Provision for (benefit from) income taxes related to other comprehensive income (loss) items	2.6	(0.7)
Other comprehensive income (loss), net of tax	23.8	(26.5)
Other comprehensive income (loss) attributable to noncontrolling interest, net of tax	1.9	1.3
Other comprehensive income (loss) attributable to Axiall, net of tax	21.9	(27.8)
Comprehensive loss, net of income taxes	(29.5)	(35.3)
Less: comprehensive income attributable to noncontrolling interest	2.2	3.1
Comprehensive loss attributable to Axiall	$ (31.7)	$ (38.4)