Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income (loss)	$ (792.5)	$ 45.1	$ (779.4)	$ 62.6
Less: net income (loss) attributable to noncontrolling interest	(22.9)	0.6	(19.8)	2.5
Net income (loss) attributable to Axiall	(769.6)	44.5	(759.6)	60.1
Other comprehensive loss:
Foreign currency translation adjustments	(46.3)	(27.4)	(69.6)	(29.3)
Derivative cash flow hedges	0.2	1.4	11.2	0.8
Pension and OPEB plan liability adjustments	33.9	(2.3)	31.1	(7.1)
Other comprehensive loss, before income taxes	(12.2)	(28.3)	(27.3)	(35.6)
Provision for (benefit from) income taxes related to other comprehensive loss items	5.9	(11.2)	7.2	(13.8)
Other comprehensive loss, net of tax	(18.1)	(17.1)	(34.5)	(21.8)
Other comprehensive loss attributable to noncontrolling interest, net of tax	(6.8)	(1.9)	(3.8)	(3.2)
Other comprehensive loss attributable to Axiall, net of tax	(11.3)	(15.2)	(30.7)	(18.6)
Comprehensive income (loss), net of income taxes	(810.6)	28.0	(813.9)	40.8
Less: comprehensive loss attributable to noncontrolling interest	(29.7)	(1.3)	(23.6)	(0.7)
Comprehensive income (loss) attributable to Axiall	$ (780.9)	$ 29.3	$ (790.3)	$ 41.5