GUARANTOR INFORMATION (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 02, 2013
Assets
Cash and cash equivalents	$ 166.8	$ 166.5	$ 200.3	$ 88.6
Receivables, net of allowance for doubtful accounts	467.0	548.8
Inventories	353.7	403.6
Prepaid expenses and other	89.7	31.6
Deferred income taxes	28.0	18.0
Total current assets	1,105.2	1,168.5
Property, plant and equipment, net	1,665.7	1,658.7
Goodwill	1,741.0	1,763.2
Customer relationships, net	1,024.5	1,101.8
Other intangible assets, net	68.1	72.9
Other assets, net	69.8	112.1
Total assets	5,674.3	5,877.2	1,801.3
Liabilities and Equity:
Current portion of long-term debt	2.8	2.8
Accounts payable	295.5	313.7
Interest payable	15.2	15.4
Income taxes payable	3.1	17.1
Accrued compensation	33.6	61.5
Other accrued liabilities	133.9	132.6
Total current liabilities	484.1	543.1
Long-term debt excluding current portion of long-term debt	1,327.8	1,330.0
Lease financing obligation	94.2	104.7
Deferred income taxes	767.5	865.5
Pensions and other post-retirement benefits	250.5	129.8
Other non-current liabilities	161.2	175.8
Total liabilities	3,085.3	3,148.9
Equity:
Total Axiall stockholders' equity	2,481.1	2,608.9
Noncontrolling interest	107.9	119.4
Total equity	2,589.0	2,728.3	603.5	488.5
Total liabilities and equity	5,674.3	5,877.2
4.625 Notes
Guarantor Condensed Consolidating Balance Sheet Information
Interest rate (as a percent)	4.625%
4.875 Notes
Guarantor Condensed Consolidating Balance Sheet Information
Interest rate (as a percent)	4.875%
9.0 percent notes
Guarantor Condensed Consolidating Balance Sheet Information
Interest rate (as a percent)					9.00%
Spinco | 4.625 Notes
Guarantor Condensed Consolidating Balance Sheet Information
Interest rate (as a percent)	4.625%
Splitco and Guarantor Subsidiaries
Guarantor Condensed Consolidating Balance Sheet Information
Ownership interest (as a percent)	100.00%
Reportable legal entity | Parent Company
Assets
Receivables, net of allowance for doubtful accounts	162.8	162.5
Prepaid expenses and other	0.1	1.3
Deferred income taxes	3.1
Total current assets	166.0	163.8
Property, plant and equipment, net	12.0	9.8
Long-term receivables - affiliates	1,292.9	1,328.6
Other assets, net	17.0	12.2
Investments in subsidiaries	1,682.7	1,747.7
Total assets	3,170.6	3,262.1
Liabilities and Equity:
Accounts payable	97.2	16.8
Interest payable	3.0	3.1
Accrued compensation		0.5
Other accrued liabilities	14.3	12.9
Total current liabilities	114.5	33.3
Long-term debt excluding current portion of long-term debt	450.0	450.0
Deferred income taxes	10.0	31.0
Pensions and other post-retirement benefits	4.4	13.7
Other non-current liabilities	110.6	125.2
Total liabilities	689.5	653.2
Equity:
Total Axiall stockholders' equity	2,481.1	2,608.9
Total equity	2,481.1	2,608.9
Total liabilities and equity	3,170.6	3,262.1
Reportable legal entity | Spinco | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Assets
Other assets, net	12.4	13.2
Investments in subsidiaries	2,831.2	2,950.8
Total assets	2,843.6	2,964.0
Liabilities and Equity:
Current portion of long-term debt	2.8	2.8
Accounts payable	178.6	119.6
Interest payable	12.2	12.3
Total current liabilities	193.6	134.7
Long-term debt excluding current portion of long-term debt	877.8	880.0
Long-term payables - affiliates	900.0	900.0
Total liabilities	1,971.4	1,914.7
Equity:
Total Axiall stockholders' equity	872.2	1,049.3
Total equity	872.2	1,049.3
Total liabilities and equity	2,843.6	2,964.0
Reportable legal entity | Guarantor Subsidiaries Excluding Eagle Spinco Inc. | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Assets
Cash and cash equivalents	78.2	76.9	131.4	43.4
Receivables, net of allowance for doubtful accounts	509.7	482.2
Inventories	257.0	310.5
Prepaid expenses and other	83.0	26.1
Deferred income taxes	24.9	20.5
Total current assets	952.8	916.2
Property, plant and equipment, net	1,367.7	1,325.6
Goodwill	1,493.7	1,496.6
Customer relationships, net	877.9	935.2
Other intangible assets, net	67.8	72.9
Other assets, net	31.7	71.7
Investments in subsidiaries	290.5	312.9
Total assets	5,082.1	5,131.1
Liabilities and Equity:
Accounts payable	249.8	319.6
Income taxes payable	0.9	12.2
Accrued compensation	25.3	49.6
Other accrued liabilities	90.3	86.5
Total current liabilities	366.3	467.9
Deferred income taxes	720.4	790.9
Pensions and other post-retirement benefits	235.7	107.0
Other non-current liabilities	118.7	116.4
Total liabilities	1,441.1	1,482.2
Equity:
Total Axiall stockholders' equity	3,641.0	3,648.9
Total equity	3,641.0	3,648.9
Total liabilities and equity	5,082.1	5,131.1
Reportable legal entity | Guarantor Subsidiaries Including Eagle Spinco Inc | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Assets
Cash and cash equivalents	78.2	76.9	131.4	43.4
Receivables, net of allowance for doubtful accounts	493.9	478.7
Inventories	257.0	310.5
Prepaid expenses and other	83.0	26.1
Deferred income taxes	24.9	20.5
Total current assets	937.0	912.7
Property, plant and equipment, net	1,367.7	1,325.6
Goodwill	1,493.7	1,496.6
Customer relationships, net	877.9	935.2
Other intangible assets, net	67.8	72.9
Other assets, net	44.0	84.9
Investments in subsidiaries	290.5	312.9
Total assets	5,078.6	5,140.8
Liabilities and Equity:
Current portion of long-term debt	2.8	2.8
Accounts payable	412.5	435.7
Interest payable	12.2	12.3
Income taxes payable	0.9	12.2
Accrued compensation	25.3	49.6
Other accrued liabilities	90.3	86.5
Total current liabilities	544.0	599.1
Long-term debt excluding current portion of long-term debt	877.8	880.0
Long-term payables - affiliates	900.0	900.0
Deferred income taxes	720.4	790.9
Pensions and other post-retirement benefits	235.7	107.0
Other non-current liabilities	118.7	116.4
Total liabilities	3,396.6	3,393.4
Equity:
Total Axiall stockholders' equity	1,682.0	1,747.4
Total equity	1,682.0	1,747.4
Total liabilities and equity	5,078.6	5,140.8
Reportable legal entity | Non-Guarantor Subsidiaries | 4.625 Notes, 4.875 Notes and Term Loan credit agreement
Assets
Cash and cash equivalents	88.6	89.6	68.9	45.2
Receivables, net of allowance for doubtful accounts	71.4	73.3
Inventories	96.7	93.1
Prepaid expenses and other	6.6	4.2
Deferred income taxes		0.2
Total current assets	263.3	260.4
Property, plant and equipment, net	286.0	323.3
Goodwill	247.3	266.6
Customer relationships, net	146.6	166.6
Other intangible assets, net	0.3
Other assets, net	9.4	15.0
Total assets	952.9	1,031.9
Liabilities and Equity:
Accounts payable	46.9	26.9
Income taxes payable	2.2	4.9
Accrued compensation	8.3	11.4
Other accrued liabilities	29.3	35.9
Total current liabilities	86.7	79.1
Long-term payables - affiliates	392.9	428.6
Lease financing obligation	94.2	104.7
Deferred income taxes	37.7	43.6
Pensions and other post-retirement benefits	10.4	9.1
Other non-current liabilities	9.0	20.9
Total liabilities	630.9	686.0
Equity:
Total Axiall stockholders' equity	214.1	226.5
Noncontrolling interest	107.9	119.4
Total equity	322.0	345.9
Total liabilities and equity	952.9	1,031.9
Eliminations
Assets
Receivables, net of allowance for doubtful accounts	(261.1)	(165.7)
Deferred income taxes		(2.7)
Total current assets	(261.1)	(168.4)
Long-term receivables - affiliates	(1,292.9)	(1,328.6)
Other assets, net	(0.6)
Investments in subsidiaries	(1,973.2)	(2,060.6)
Total assets	(3,527.8)	(3,557.6)
Liabilities and Equity:
Accounts payable	(261.1)	(165.7)
Other accrued liabilities		(2.7)
Total current liabilities	(261.1)	(168.4)
Long-term payables - affiliates	(1,292.9)	(1,328.6)
Deferred income taxes	(0.6)
Other non-current liabilities	(77.1)	(86.7)
Total liabilities	(1,631.7)	(1,583.7)
Equity:
Total Axiall stockholders' equity	(1,896.1)	(1,973.9)
Total equity	(1,896.1)	(1,973.9)
Total liabilities and equity	$ (3,527.8)	$ (3,557.6)