ACCUMULATED OTHER COMPREHENSIVE INCOME AND OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income
Balance at the beginning of the period			$ 66.3
Other comprehensive income (loss) before reclassifications			(14.2)
Amounts reclassified from accumulated other comprehensive income (loss)			(4.4)
Other comprehensive income (loss) attributable to Axiall, net of tax	(15.2)	7.4	(18.6)	(10.3)
Balance at the end of the period	47.7		47.7
Accrued Pension and OPEB Plan Liabilities
Accumulated Other Comprehensive Income
Balance at the beginning of the period			60.5
Other comprehensive income (loss) before reclassifications			(0.1)
Amounts reclassified from accumulated other comprehensive income (loss)			(4.4)
Other comprehensive income (loss) attributable to Axiall, net of tax			(4.5)
Balance at the end of the period	56.0		56.0
Foreign Currency Items
Accumulated Other Comprehensive Income
Balance at the beginning of the period			6.7
Other comprehensive income (loss) before reclassifications			(14.6)
Other comprehensive income (loss) attributable to Axiall, net of tax			(14.6)
Balance at the end of the period	(7.9)		(7.9)
Derivative Cash Flow Hedges
Accumulated Other Comprehensive Income
Balance at the beginning of the period			(0.9)
Other comprehensive income (loss) before reclassifications			0.5
Other comprehensive income (loss) attributable to Axiall, net of tax			0.5
Balance at the end of the period	$ (0.4)		$ (0.4)