Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 874.4	$ 1,047.2	$ 2,605.7	$ 2,905.8
Operating costs and expenses:
Cost of sales	756.9	888.4	2,259.1	2,519.4
Selling, general and administrative expenses	68.6	78.5	229.2	228.5
Integration-related costs and other, net	2.4	6.8	11.7	19.9
Restructuring and divestiture costs	10.0	1.3	11.4	4.9
Goodwill impairment charges	847.8		847.8
Total operating costs and expenses	1,685.7	975.0	3,359.2	2,772.7
Operating income (loss)	(811.3)	72.2	(753.5)	133.1
Interest expense, net	(19.6)	(19.5)	(57.9)	(56.9)
Debt refinancing costs			(3.2)
Foreign exchange loss	(0.5)	(0.3)	(1.0)	(0.2)
Income (loss) from continuing operations before income taxes	(831.4)	52.4	(815.6)	76.0
Provision for (benefit from) income taxes	(33.9)	8.9	(29.9)	12.8
Net income (loss) from continuing operations	(797.5)	43.5	(785.7)	63.2
Discontinued operations:
Income (loss) from discontinued operations	11.0	2.0	11.6	(0.9)
Less: Provision for (benefit from) income taxes of discontinued operations	6.0	0.4	5.3	(0.3)
Net income (loss) from discontinued operations	5.0	1.6	6.3	(0.6)
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
Basic earnings (loss) per share attributable to Axiall:
Earnings (loss) per share from continuing operations	$ (10.98)	$ 0.61	$ (10.88)	$ 0.87
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:
Earnings (loss) per share from continuing operations	(10.98)	0.61	(10.88)	0.86
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
Weighted average common shares outstanding:
Basic (in shares)	70.6	70.2	70.4	70.0
Diluted (in shares)	70.6	70.6	70.4	70.6
Dividends per common share (in dollars per share)	$ 0.16	$ 0.16	$ 0.48	$ 0.48