ACCUMULATED OTHER COMPREHENSIVE INCOME AND OTHER COMPREHENSIVE LOSS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income
Balance at the beginning of the period	$ 66.3
Other comprehensive loss before reclassifications	(11.8)
Amounts reclassified from accumulated other comprehensive loss	(1.5)
Other comprehensive loss attributable to Axiall, net of tax	(13.3)	(7.7)
Balance at the end of the period	53.0
Accrued Pension Benefit Liabilities
Accumulated Other Comprehensive Income
Balance at the beginning of the period	60.5
Amounts reclassified from accumulated other comprehensive loss	(1.5)
Other comprehensive loss attributable to Axiall, net of tax	(1.5)
Balance at the end of the period	59.0
Foreign Currency Items
Accumulated Other Comprehensive Income
Balance at the beginning of the period	6.7
Other comprehensive loss before reclassifications	(11.6)
Other comprehensive loss attributable to Axiall, net of tax	(11.6)
Balance at the end of the period	(4.9)
Equity Investee's Other Comprehensive Loss
Accumulated Other Comprehensive Income
Balance at the beginning of the period	(0.9)
Other comprehensive loss before reclassifications	(0.2)
Other comprehensive loss attributable to Axiall, net of tax	(0.2)
Balance at the end of the period	$ (1.1)