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LONG-TERM DEBT AND LEASE FINANCING OBLIGATION (Details) $ in Millions		6 Months Ended	12 Months Ended
	Feb. 27, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 01, 2013 USD ($)
Debt Instrument
Total debt		$ 1,384.0	$ 1,330.6
Less: current portion of long-term debt		(2.5)	(2.8)
Long-term debt, net		1,381.5	1,327.8
Lease financing obligation		88.2	$ 94.2
Future minimum lease payments
2015		2.6
2016		5.1
2017		$ 1.3
4.625 Notes
Debt Instrument
Stated Interest Rate (as a percent)		4.625%	4.625%
Total debt		$ 688.0	$ 688.0
Principal amount		$ 688.0
4.875 Notes
Debt Instrument
Stated Interest Rate (as a percent)		4.875%	4.875%
Total debt		$ 450.0	$ 450.0
Principal amount				$ 450.0
Term Loan Due 2017
Debt Instrument
Total debt			192.6
Debt issuance costs			1.8
Term Loan Due 2022
Debt Instrument
Stated Interest Rate (as a percent)		4.00%
Total debt		$ 246.0
Debt issuance costs and discounts		2.8
Term Loan Due 2022 \| Axiall Holdco
Debt Instrument
Principal amount	$ 250.0
Additional amount of term loans permitted under term loan facility subject to certain conditions	$ 250.0
Maximum consolidated secured debt ratio related to additional amount of term loans permitted under term loan facility	2.50
Term Loan Due 2022 \| Axiall Holdco \| Base Rate
Debt Instrument
Variable interest rate margin (as a percent)	1.50%
Variable interest rate basis floor (as a percent)	2.00%
Term Loan Due 2022 \| Axiall Holdco \| LIBOR
Debt Instrument
Variable interest rate margin (as a percent)	3.25%
Variable interest rate basis floor (as a percent)	0.75%
ABL Revolver
Debt Instrument
Total debt		0.0	0.0
Maximum borrowing capacity		600.0
Maximum cash dividends if conditions are met		150.0
Availability under the credit facility that, if exceeded, limits the cash dividend payments the entity is allowed to make		$ 75.0
Consecutive period of borrowing availability under the credit facility used to determine cash dividend payments allowed		30 days
Fixed charge coverage ratio that, if exceeded, limits the cash dividend payments the entity is allowed to make		1.00%
Availability under the credit facility that, if exceeded, allows the entity to make additional cash dividend payments		$ 100.0
Fixed charge coverage ratio, if exceeded, allows the entity to make additional cash dividend payments		1.10%
Availability under the credit facility		$ 489.4
Outstanding letters of credit		82.0
Lease financing obligation
Debt Instrument
Lease financing obligation		$ 88.2	$ 94.2
Lease financing obligation term		10 years