Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 699.2	$ 784.6
Operating costs and expenses:
Cost of sales	619.0	680.7
Selling, general and administrative expenses	70.1	76.0
Restructuring and divestiture costs	36.7	0.7
Integration-related costs and other, net	3.4	5.1
Fees associated with unsolicited offer and strategic alternatives	5.2
Total operating costs and expenses	734.4	762.5
Operating income (loss)	(35.2)	22.1
Interest expense, net	(17.0)	(17.6)
Debt refinancing costs		(3.2)
Foreign currency exchange loss	(0.9)	(0.7)
Income (loss) from continuing operations before income taxes	(53.1)	0.6
Provision for (benefit from) income taxes	(22.8)	3.0
Net loss from continuing operations	(30.3)	(2.4)
Discontinued operations:
Loss from discontinued operations	(31.4)	(7.2)
Less: Benefit from income taxes of discontinued operations	(8.4)	(0.8)
Net loss from discontinued operations	(23.0)	(6.4)
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)
Basic loss per share attributable to Axiall:
Basic loss per share from continuing operations	$ (0.43)	$ (0.06)
Basic loss per share from discontinued operations	(0.33)	(0.09)
Basic loss per share attributable to Axiall	(0.76)	(0.15)
Diluted loss per share attributable to Axiall:
Diluted loss per share from continuing operations	(0.43)	(0.06)
Diluted loss per share from discontinued operations	(0.33)	(0.09)
Diluted loss per share attributable to Axiall	$ (0.76)	$ (0.15)
Weighted average common shares outstanding:
Basic	70.6	70.2
Diluted	70.6	70.2
Dividends per common share	$ 0.16	$ 0.16