GUARANTOR INFORMATION (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 02, 2013
Guarantor Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
Net sales	$ 1,068.7	$ 1,269.4	$ 1,236.9	$ 993.7	$ 1,134.5	$ 1,197.5	$ 1,272.8	$ 1,061.2	$ 4,568.7	$ 4,666.0	$ 3,325.8
Operating costs and expenses:
Cost of sales									4,068.1	3,924.5	2,865.4
Selling, general and administrative expenses									310.5	299.1	203.5
Transaction-related costs and other, net									38.4	35.6	38.9
Long-lived asset impairment charges (recoveries), net									17.6	36.0	(0.8)
Gain on sale of assets											(19.3)
Total operating costs and expenses									4,434.6	4,295.2	3,087.7
Operating income	1.9	74.2	58.4	(0.4)	96.9	78.1	124.6	71.2	134.1	370.8	238.1
Other income (expense):
Interest expense, net									(75.8)	(76.6)	(57.1)
Foreign exchange gain (loss)									(0.6)		(0.6)
Loss on redemption and other debt costs										(78.5)	(2.7)
Gain on acquisition of controlling interest										25.9
Income (loss) before income taxes									57.7	241.6	177.7
Provision for (benefit from) income taxes									7.5	73.6	57.2
Consolidated net income	(12.4)	45.1	28.1	(10.6)	57.8	39.3	73.7	(2.8)	50.2	168.0	120.5
Less net income attributable to noncontrolling interest									3.9	2.7
Net income (loss) attributable to Axiall	(13.8)	44.5	27.2	(11.6)	57.0	39.0	72.8	(3.5)	46.3	165.3	120.5
Comprehensive income (loss) attributable to Axiall									(93.7)	253.5	116.8
9.0 percent notes
Other income (expense):
Loss on redemption and other debt costs												2.2
Reportable legal entity | Parent Company
Operating costs and expenses:
Selling, general and administrative expenses									45.5	41.3	38.1
Transaction-related costs and other, net									15.4	34.4	35.8
Long-lived asset impairment charges (recoveries), net										7.5
Total operating costs and expenses									60.9	83.2	73.9
Operating income									(60.9)	(83.2)	(73.9)
Other income (expense):
Interest expense, net									31.1	(45.7)	(89.9)
Foreign exchange gain (loss)											0.2
Loss on redemption and other debt costs										(66.1)	(2.7)
Equity in income (loss) of subsidiaries									55.7	293.1	233.3
Income (loss) before income taxes									25.9	98.1	67.0
Provision for (benefit from) income taxes									(20.4)	(67.2)	(53.5)
Consolidated net income									46.3	165.3
Net income (loss) attributable to Axiall									46.3	165.3	120.5
Comprehensive income (loss) attributable to Axiall									(93.7)	253.5	116.8
Reportable legal entity | Spinco | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Other income (expense):
Interest expense, net									(87.4)	(45.8)
Loss on redemption and other debt costs										(12.4)
Equity in income (loss) of subsidiaries									(19.3)	114.3
Income (loss) before income taxes									(106.7)	56.1
Provision for (benefit from) income taxes									(29.9)	(19.7)
Consolidated net income									(76.8)	75.8
Net income (loss) attributable to Axiall									(76.8)	75.8
Comprehensive income (loss) attributable to Axiall									(193.1)	165.7
Reportable legal entity | Guarantor Subsidiaries Excluding Eagle Spinco Inc. | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Guarantor Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
Net sales									4,036.3	4,125.1	2,880.8
Operating costs and expenses:
Cost of sales									3,658.1	3,520.8	2,518.0
Selling, general and administrative expenses									188.6	181.4	94.5
Transaction-related costs and other, net									15.2	(2.3)	2.6
Long-lived asset impairment charges (recoveries), net									17.5	25.5	(0.8)
Gain on sale of assets											(19.3)
Total operating costs and expenses									3,879.4	3,725.4	2,595.0
Operating income									156.9	399.7	285.8
Other income (expense):
Interest expense, net									1.9	37.7	56.3
Foreign exchange gain (loss)									(0.5)		(0.1)
Gain on acquisition of controlling interest										25.9
Equity in income (loss) of subsidiaries									11.7	22.6	0.7
Income (loss) before income taxes									170.0	485.9	342.7
Provision for (benefit from) income taxes									59.6	157.1	115.2
Consolidated net income									110.4	328.8
Net income (loss) attributable to Axiall									110.4	328.8	227.5
Comprehensive income (loss) attributable to Axiall									(50.4)	479.3	219.9
Reportable legal entity | Guarantor Subsidiaries Including Eagle Spinco Inc | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Guarantor Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
Net sales									4,036.3	4,125.1	2,880.8
Operating costs and expenses:
Cost of sales									3,658.1	3,520.8	2,518.0
Selling, general and administrative expenses									188.6	181.4	94.5
Transaction-related costs and other, net									15.2	(2.3)	2.6
Long-lived asset impairment charges (recoveries), net									17.5	25.5	(0.8)
Gain on sale of assets											(19.3)
Total operating costs and expenses									3,879.4	3,725.4	2,595.0
Operating income									156.9	399.7	285.8
Other income (expense):
Interest expense, net									(85.5)	(8.1)	56.3
Foreign exchange gain (loss)									(0.5)		(0.1)
Loss on redemption and other debt costs										(12.4)
Gain on acquisition of controlling interest										25.9
Equity in income (loss) of subsidiaries									11.7	22.6	0.7
Income (loss) before income taxes									82.6	427.7	342.7
Provision for (benefit from) income taxes									29.7	137.4	115.2
Consolidated net income									52.9	290.3
Net income (loss) attributable to Axiall									52.9	290.3	227.5
Comprehensive income (loss) attributable to Axiall									(107.9)	429.0	219.9
Reportable legal entity | Non-Guarantor Subsidiaries | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Guarantor Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
Net sales									762.7	734.4	611.1
Operating costs and expenses:
Cost of sales									640.3	597.2	513.5
Selling, general and administrative expenses									76.4	76.4	70.9
Transaction-related costs and other, net									7.8	3.5	0.5
Long-lived asset impairment charges (recoveries), net									0.1	3.0
Total operating costs and expenses									724.6	680.1	584.9
Operating income									38.1	54.3	26.2
Other income (expense):
Interest expense, net									(21.4)	(22.8)	(23.5)
Foreign exchange gain (loss)									(0.1)		(0.7)
Income (loss) before income taxes									16.6	31.5	2.0
Provision for (benefit from) income taxes									(1.8)	3.4	(4.5)
Consolidated net income									18.4	28.1
Less net income attributable to noncontrolling interest									3.9	2.7
Net income (loss) attributable to Axiall									14.5	25.4	6.5
Comprehensive income (loss) attributable to Axiall									(0.9)	19.8	4.1
Eliminations
Guarantor Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)
Net sales									(230.3)	(193.5)	(166.1)
Operating costs and expenses:
Cost of sales									(230.3)	(193.5)	(166.1)
Total operating costs and expenses									(230.3)	(193.5)	(166.1)
Other income (expense):
Equity in income (loss) of subsidiaries									(67.4)	(315.7)	(234.0)
Income (loss) before income taxes									(67.4)	(315.7)	(234.0)
Consolidated net income									(67.4)	(315.7)
Net income (loss) attributable to Axiall									(67.4)	(315.7)	(234.0)
Comprehensive income (loss) attributable to Axiall									$ 108.8	$ (448.8)	$ (224.0)