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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) AND OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss)        
Balance at the beginning of the period     $ 66.3  
Other comprehensive income (loss) before reclassifications     (0.4)  
Amounts reclassified from accumulated other comprehensive income (loss)     (3.0)  
Other comprehensive income (loss) attributable to Axiall, net of tax 9.9 (10.1) (3.4) (17.8)
Balance at the end of the period 62.9   62.9  
Accrued Pension Benefit Liabilities
        
Accumulated Other Comprehensive Income (Loss)        
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)     (3.0)  
Other comprehensive income (loss) attributable to Axiall, net of tax     (3.1)  
Balance at the end of the period 57.4   57.4  
Foreign Currency Items
        
Accumulated Other Comprehensive Income (Loss)        
Balance at the beginning of the period     6.7  
Other comprehensive income (loss) before reclassifications     0.1  
Other comprehensive income (loss) attributable to Axiall, net of tax     0.1  
Balance at the end of the period 6.8   6.8  
Derivative Cash Flow Hedges
        
Accumulated Other Comprehensive Income (Loss)        
Balance at the beginning of the period     (0.9)  
Other comprehensive income (loss) before reclassifications     (0.4)  
Other comprehensive income (loss) attributable to Axiall, net of tax     (0.4)  
Balance at the end of the period $ (1.3)   $ (1.3)