Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 776.1	$ 869.2	$ 1,475.3	$ 1,653.8
Operating costs and expenses:
Cost of sales	705.5	745.7	1,324.5	1,426.4
Selling, general and administrative expenses	69.8	75.8	139.9	151.8
Restructuring and divestiture costs	4.5	0.4	41.2	1.1
Integration-related costs and other, net	2.1	4.2	5.5	9.3
Legal and settlement claims, net	23.4		23.4
Fees associated with unsolicited offer and strategic alternatives	8.4		13.6
Total operating costs and expenses	813.7	826.1	1,548.1	1,588.6
Operating income (loss)	(37.6)	43.1	(72.8)	65.2
Interest expense, net	(18.0)	(18.3)	(35.0)	(35.9)
Debt refinancing costs				(3.2)
Foreign currency exchange loss	(0.1)	(0.1)	(1.0)	(0.8)
Income (loss) from continuing operations before income taxes	(55.7)	24.7	(108.8)	25.3
Provision for (benefit from) income taxes	(28.4)	1.9	(51.2)	4.9
Net income (loss) from continuing operations	(27.3)	22.8	(57.6)	20.4
Discontinued operations:
Loss from discontinued operations	(1.7)	(1.7)	(33.1)	(8.9)
Less: Benefit from income taxes of discontinued operations	(1.7)	(0.8)	(10.1)	(1.6)
Net loss from discontinued operations		(0.9)	(23.0)	(7.3)
Consolidated net income (loss)	(27.3)	21.9	(80.6)	13.1
Less: net income attributable to noncontrolling interest	0.5	1.3	0.8	3.1
Net income (loss) attributable to Axiall	$ (27.8)	$ 20.6	$ (81.4)	$ 10.0
Basic earnings (loss) per share attributable to Axiall:
Basic earnings (loss) per share from continuing operations	$ (0.39)	$ 0.30	$ (0.83)	$ 0.25
Basic loss per share from discontinued operations		(0.01)	(0.32)	(0.11)
Basic earnings (loss) per share attributable to Axiall	(0.39)	0.29	(1.15)	0.14
Diluted earnings (loss) per share attributable to Axiall:
Diluted earnings (loss) per share from continuing operations	(0.39)	0.30	(0.83)	0.25
Diluted loss per share from discontinued operations		(0.01)	(0.32)	(0.11)
Diluted earnings (loss) per share attributable to Axiall	$ (0.39)	$ 0.29	$ (1.15)	$ 0.14
Weighted average common shares outstanding:
Basic	70.6	70.4	70.6	70.3
Diluted	70.6	70.9	70.6	70.9
Dividends per common share	$ 0.16	$ 0.16	$ 0.32	$ 0.32