Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
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
Other comprehensive income (loss):
Foreign currency translation adjustments	0.1	11.5	28.8	(23.5)
Derivative cash flow hedges	1.6	2.0	1.5	11.1
Pension and OPEB plan liability adjustments	(2.3)	(1.6)	(4.5)	(2.8)
Other comprehensive income (loss), before income taxes	(0.6)	11.9	25.8	(15.2)
Provision for (benefit from) income taxes related to other comprehensive income (loss) items	(0.3)	1.8	2.3	1.2
Other comprehensive income (loss), net of tax	(0.3)	10.1	23.5	(16.4)
Other comprehensive income attributable to noncontrolling interest, net of tax	0.1	1.7	2.0	3.0
Other comprehensive income (loss) attributable to Axiall, net of tax	(0.4)	8.4	21.5	(19.4)
Comprehensive income (loss), net of income taxes	(27.6)	32.0	(57.1)	(3.3)
Less: comprehensive income attributable to noncontrolling interest	0.6	3.0	2.8	6.1
Comprehensive income (loss) attributable to Axiall	$ (28.2)	$ 29.0	$ (59.9)	$ (9.4)