EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator
Income (loss) from continuing operations	$ (797.5)	$ 43.5	$ (785.7)	$ 63.2
Less net income (loss) attributable to noncontrolling interest	(22.9)	0.6	(19.8)	2.5
Income (loss) from continuing operations attributable to Axiall	(774.6)	42.9	(765.9)	60.7
Less: net income (loss) from discontinued operations	5.0	1.6	6.3	(0.6)
Consolidated net income (loss) attributable to Axiall	$ (769.6)	$ 44.5	$ (759.6)	$ 60.1
Denominator
Weighted average common shares outstanding, basic	70.6	70.2	70.4	70.0
Dilutive impact of stock options and other share-based awards		0.4		0.6
Weighted average common shares outstanding, diluted	70.6	70.6	70.4	70.6
Basic earnings (loss) per share attributable to Axiall:
Basic earnings (loss) per share from continuing operations attributable to Axiall	$ (10.98)	$ 0.61	$ (10.88)	$ 0.87
Basic earnings (loss) per share from discontinued operations	0.08	0.03	0.09	(0.01)
Earnings (loss) per share attributable to Axiall	(10.90)	0.64	(10.79)	0.86
Diluted earnings (loss) per share attributable to Axiall:
Diluted earnings (loss) per share from continuing operations attributable to Axiall	(10.98)	0.61	(10.88)	0.86
Diluted earnings (loss) per share from discontinued operations	0.08	0.02	0.09	(0.01)
Earnings (loss) per share Attributable to Axiall	$ (10.90)	$ 0.63	$ (10.79)	$ 0.85