SUPPLEMENTAL GUARANTOR INFORMATION (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 79.9	$ 200.3	$ 118.5	$ 88.6
Receivables, net of allowance for doubtful accounts	637.1	314.9
Inventories	414.8	288.4
Prepaid expenses and other	65.6	14.7
Deferred income taxes	10.4	21.1
Total current assets	1,207.8	839.4
Property, plant and equipment, net	1,649.3	637.7
Goodwill	1,720.0	217.2
Intangibles, net	1,139.6	43.4
Other assets, net	76.4	63.6
Total assets	5,793.1	1,801.3
Liabilities and Equity
Current portion of long-term debt	2.8
Accounts payable	332.0	211.2
Interest payable	12.8	18.9
Income taxes payable	3.8	15.1
Accrued compensation	47.5	44.7
Other accrued current liabilities	128.7	61.2
Total current liabilities	527.6	351.1
Long-term debt, excluding the current portion of long-term debt	1,330.5	448.1
Lease financing obligation	108.3	112.3
Deferred income taxes	743.9	177.9
Pensions and other postretirement benefits	331.5	48.3
Other non-current liabilities	171.1	60.1
Total liabilities	3,212.9	1,197.8
Equity:
Total Axiall stockholders' equity (deficit)	2,461.6	603.5
Noncontrolling interest	118.6
Total equity	2,580.2	603.5
Total liabilities and equity	5,793.1	1,801.3
Parent Company
Assets
Receivables, net of allowance for doubtful accounts	0.9	2.2
Prepaid expenses and other	21.8
Deferred income taxes	7.9	7.9
Total current assets	30.6	10.1
Property, plant and equipment, net	4.2	1.5
Long-term receivables - affiliates	442.7	458.0
Other assets, net	12.7	14.0
Investments in Subsidiaries	3,436.9	1,446.5
Total assets	3,927.1	1,930.1
Liabilities and Equity
Accounts payable	856.6	745.1
Interest payable	8.5	18.9
Other accrued current liabilities	10.7	1.0
Total current liabilities	875.8	765.0
Long-term debt, excluding the current portion of long-term debt	450.0	448.1
Deferred income taxes	11.4	16.9
Other non-current liabilities	128.3	96.6
Total liabilities	1,465.5	1,326.6
Equity:
Total Axiall stockholders' equity (deficit)	2,461.6	603.5
Total equity	2,461.6	603.5
Total liabilities and equity	3,927.1	1,930.1
Eliminations
Assets
Receivables, net of allowance for doubtful accounts	(851.4)	(731.7)
Total current assets	(851.4)	(731.7)
Long-term receivables - affiliates	(442.7)	(467.4)
Investments in Subsidiaries	(3,748.4)	(1,446.5)
Total assets	(5,042.5)	(2,645.6)
Liabilities and Equity
Accounts payable	(851.4)	(731.7)
Total current liabilities	(851.4)	(731.7)
Long-term payables - affiliates	(442.7)	(467.4)
Other non-current liabilities	(88.6)	(104.8)
Total liabilities	(1,382.7)	(1,303.9)
Equity:
Total Axiall stockholders' equity (deficit)	(3,659.8)	(1,341.7)
Total equity	(3,659.8)	(1,341.7)
Total liabilities and equity	(5,042.5)	(2,645.6)
4.625 Notes, 4.875 Notes and Term Loan Credit Agreement | Guarantor Subsidiaries
Assets
Cash and cash equivalents	15.7	131.4
Receivables, net of allowance for doubtful accounts	1,372.9
Inventories	309.9
Prepaid expenses and other	40.3
Deferred income taxes	2.3
Total current assets	1,741.1
Property, plant and equipment, net	1,320.4
Goodwill	1,444.5
Intangibles, net	970.7
Other assets, net	47.9
Investments in Subsidiaries	311.5
Total assets	5,836.1
Liabilities and Equity
Current portion of long-term debt	2.8
Accounts payable	277.8
Interest payable	4.3
Accrued compensation	34.0
Other accrued current liabilities	80.2
Total current liabilities	399.1
Long-term debt, excluding the current portion of long-term debt	880.5
Deferred income taxes	686.4
Pensions and other postretirement benefits	319.6
Other non-current liabilities	114.1
Total liabilities	2,399.7
Equity:
Total Axiall stockholders' equity (deficit)	3,436.4
Total equity	3,436.4
Total liabilities and equity	5,836.1
4.625 Notes, 4.875 Notes and Term Loan Credit Agreement | Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	64.2	68.9
Receivables, net of allowance for doubtful accounts	114.7
Inventories	104.9
Prepaid expenses and other	3.5
Deferred income taxes	0.2
Total current assets	287.5
Property, plant and equipment, net	324.7
Goodwill	275.5
Intangibles, net	168.9
Other assets, net	15.8
Total assets	1,072.4
Liabilities and Equity
Accounts payable	49.0
Income taxes payable	3.8
Accrued compensation	13.5
Other accrued current liabilities	37.8
Total current liabilities	104.1
Long-term payables - affiliates	442.7
Lease financing obligation	108.3
Deferred income taxes	46.1
Pensions and other postretirement benefits	11.9
Other non-current liabilities	17.3
Total liabilities	730.4
Equity:
Total Axiall stockholders' equity (deficit)	223.4
Noncontrolling interest	118.6
Total equity	342.0
Total liabilities and equity	1,072.4
Splitco Notes
Supplemental Condensed Consolidating Balance Sheet Information
Interest rate (as a percent)	4.625%
4.875 Notes
Supplemental Condensed Consolidating Balance Sheet Information
Interest rate (as a percent)	4.875%
9 percent notes
Supplemental Condensed Consolidating Balance Sheet Information
Interest rate (as a percent)		9.00%	9.00%
9 percent notes | Guarantor Subsidiaries
Assets
Cash and cash equivalents		131.0	79.5	43.4
Receivables, net of allowance for doubtful accounts		989.1
Inventories		201.6
Prepaid expenses and other		11.9
Deferred income taxes		13.0
Total current assets		1,346.6
Property, plant and equipment, net		422.0
Long-term receivables - affiliates		9.4
Goodwill		105.0
Intangibles, net		40.9
Other assets, net		38.8
Total assets		1,962.7
Liabilities and Equity
Accounts payable		176.3
Income taxes payable		13.9
Accrued compensation		29.4
Other accrued current liabilities		38.5
Total current liabilities		258.1
Deferred income taxes		161.0
Pensions and other postretirement benefits		48.3
Other non-current liabilities		48.7
Total liabilities		516.1
Equity:
Total Axiall stockholders' equity (deficit)		1,446.6
Total equity		1,446.6
Total liabilities and equity		1,962.7
9 percent notes | Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents		69.3	39.0	45.2
Receivables, net of allowance for doubtful accounts		55.3
Inventories		86.8
Prepaid expenses and other		2.8
Deferred income taxes		0.2
Total current assets		214.4
Property, plant and equipment, net		214.2
Goodwill		112.2
Intangibles, net		2.5
Other assets, net		10.8
Total assets		554.1
Liabilities and Equity
Accounts payable		21.5
Income taxes payable		1.2
Accrued compensation		15.3
Other accrued current liabilities		21.7
Total current liabilities		59.7
Long-term payables - affiliates		467.4
Lease financing obligation		112.3
Other non-current liabilities		19.6
Total liabilities		659.0
Equity:
Total Axiall stockholders' equity (deficit)		(104.9)
Total equity		(104.9)
Total liabilities and equity		$ 554.1