v3.4.0.3
Guarantor Information - Guarantor Condensed Consolidating Balance Sheet Information (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets:        
Cash and cash equivalents $ 201.4 $ 258.0 $ 134.7 $ 166.8
Receivables, net of allowance for doubtful accounts 381.2 355.3    
Inventories 307.2 280.9    
Prepaid expenses and other 69.1 58.9    
Current assets of discontinued operations 0.6 36.9    
Total current assets 959.5 990.0    
Property, plant and equipment, net 1,539.8 1,556.5    
Goodwill 856.2 852.1    
Customer relationships, net 938.9 950.3    
Other intangible assets, net 62.0 63.4    
Non-current assets of discontinued operations   62.0    
Other assets, net 70.1 65.1    
Total assets 4,426.5 4,539.4    
Liabilities and Equity:        
Current portion of long-term debt 2.5 2.5    
Accounts payable 260.3 244.8    
Interest payable 12.8 15.4    
Income taxes payable 2.3 2.2    
Accrued compensation 38.0 41.0    
Other accrued liabilities 84.4 94.7    
Current liabilities of discontinued operations 5.5 15.5    
Total current liabilities 405.8 416.1    
Long-term debt, excluding the current portion of long-term debt 1,364.6 1,364.5    
Lease financing obligation 46.9 44.0    
Deferred income taxes 678.7 683.0    
Pension and other post-retirement benefits 193.8 202.8    
Non-current liabilities of discontinued operations   35.6    
Other non-current liabilities 124.8 140.3    
Total liabilities 2,814.6 2,886.3    
Equity:        
Total Axiall stockholders' equity 1,534.9 1,578.3    
Noncontrolling interest 77.0 74.8    
Total equity 1,611.9 1,653.1    
Total liabilities and equity 4,426.5 4,539.4    
Eliminations [Member]        
Assets:        
Receivables, net of allowance for doubtful accounts (156.1) (97.6)    
Prepaid expenses and other   (0.4)    
Total current assets (156.1) (98.0)    
Long-term receivables-affiliates (900.0) (900.0)    
Investment in subsidiaries (1,673.9) (1,708.7)    
Total assets (2,730.0) (2,706.7)    
Liabilities and Equity:        
Accounts payable (156.1) (97.6)    
Income taxes payable   (0.4)    
Total current liabilities (156.1) (98.0)    
Long-term payables-affiliates (900.0) (900.0)    
Other non-current liabilities (10.7) (7.2)    
Total liabilities (1,066.8) (1,005.2)    
Equity:        
Total Axiall stockholders' equity (1,663.2) (1,701.5)    
Total equity (1,663.2) (1,701.5)    
Total liabilities and equity (2,730.0) (2,706.7)    
Parent Company [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents 0.5 0.3    
Receivables, net of allowance for doubtful accounts 38.6 27.1    
Prepaid expenses and other 0.4 0.7    
Total current assets 39.5 28.1    
Property, plant and equipment, net 10.7 11.0    
Long-term receivables-affiliates 900.0 900.0    
Other assets, net 4.9 5.6    
Investment in subsidiaries 1,207.1 1,235.5    
Total assets 2,162.2 2,180.2    
Liabilities and Equity:        
Accounts payable 123.6 81.7    
Interest payable 8.6 3.2    
Accrued compensation 1.9 9.5    
Other accrued liabilities 15.3 16.2    
Total current liabilities 149.4 110.6    
Long-term debt, excluding the current portion of long-term debt 444.4 444.2    
Deferred income taxes 19.2 18.0    
Pension and other post-retirement benefits 3.3 3.6    
Other non-current liabilities 11.0 25.5    
Total liabilities 627.3 601.9    
Equity:        
Total Axiall stockholders' equity 1,534.9 1,578.3    
Total equity 1,534.9 1,578.3    
Total liabilities and equity 2,162.2 2,180.2    
Eagle Spinco Inc [Member] | Reportable Legal Entities [Member]        
Assets:        
Receivables, net of allowance for doubtful accounts 0.6 5.5    
Total current assets 0.6 5.5    
Other assets, net 1.7 1.7    
Investment in subsidiaries 1,827.5 1,833.3    
Total assets 1,829.8 1,840.5    
Liabilities and Equity:        
Accounts payable 38.5 27.0    
Interest payable 4.2 12.2    
Total current liabilities 42.7 39.2    
Long-term debt, excluding the current portion of long-term debt 678.8 678.4    
Long-term payables-affiliates 900.0 900.0    
Total liabilities 1,621.5 1,617.6    
Equity:        
Total Axiall stockholders' equity 208.3 222.9    
Total equity 208.3 222.9    
Total liabilities and equity 1,829.8 1,840.5    
Guarantor Subsidiaries Excluding Eagle Spinco Inc [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents 80.6 161.7 76.3 78.2
Receivables, net of allowance for doubtful accounts 436.3 377.8    
Inventories 246.2 217.6    
Prepaid expenses and other 62.6 55.9    
Current assets of discontinued operations 0.6 19.3    
Total current assets 826.3 832.3    
Property, plant and equipment, net 1,359.7 1,357.9    
Goodwill 707.8 707.8    
Customer relationships, net 809.4 823.1    
Other intangible assets, net 62.0 63.1    
Non-current assets of discontinued operations   18.4    
Other assets, net 61.8 56.2    
Investment in subsidiaries 466.8 473.2    
Total assets 4,293.8 4,332.0    
Liabilities and Equity:        
Current portion of long-term debt 2.5 2.5    
Accounts payable 222.9 214.9    
Income taxes payable   0.4    
Accrued compensation 28.2 23.7    
Other accrued liabilities 37.7 45.6    
Current liabilities of discontinued operations 5.5 9.3    
Total current liabilities 296.8 296.4    
Long-term debt, excluding the current portion of long-term debt 241.3 241.9    
Deferred income taxes 629.6 636.1    
Pension and other post-retirement benefits 184.0 189.9    
Other non-current liabilities 116.0 113.2    
Total liabilities 1,467.7 1,477.5    
Equity:        
Total Axiall stockholders' equity 2,826.1 2,854.5    
Total equity 2,826.1 2,854.5    
Total liabilities and equity 4,293.8 4,332.0    
Guarantor Subsidiaries Including Eagle Spinco Inc [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents 80.6 161.7 76.3 78.2
Receivables, net of allowance for doubtful accounts 436.3 377.8    
Inventories 246.2 217.6    
Prepaid expenses and other 62.6 55.9    
Current assets of discontinued operations 0.6 19.3    
Total current assets 826.3 832.3    
Property, plant and equipment, net 1,359.7 1,357.9    
Goodwill 707.8 707.8    
Customer relationships, net 809.4 823.1    
Other intangible assets, net 62.0 63.1    
Non-current assets of discontinued operations   18.4    
Other assets, net 61.8 56.2    
Investment in subsidiaries 466.8 473.2    
Total assets 4,293.8 4,332.0    
Liabilities and Equity:        
Current portion of long-term debt 2.5 2.5    
Accounts payable 260.7 236.4    
Interest payable 4.2 12.2    
Income taxes payable   0.4    
Accrued compensation 28.2 23.7    
Other accrued liabilities 37.7 45.6    
Current liabilities of discontinued operations 5.5 9.3    
Total current liabilities 338.8 330.1    
Long-term debt, excluding the current portion of long-term debt 920.2 920.3    
Long-term payables-affiliates 900.0 900.0    
Deferred income taxes 627.9 634.4    
Pension and other post-retirement benefits 184.0 189.9    
Other non-current liabilities 116.0 113.2    
Total liabilities 3,086.9 3,087.9    
Equity:        
Total Axiall stockholders' equity 1,206.9 1,244.1    
Total equity 1,206.9 1,244.1    
Total liabilities and equity 4,293.8 4,332.0    
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents 120.3 96.0 $ 58.4 $ 88.6
Receivables, net of allowance for doubtful accounts 62.4 48.0    
Inventories 61.0 63.3    
Prepaid expenses and other 6.1 2.7    
Current assets of discontinued operations   17.6    
Total current assets 249.8 227.6    
Property, plant and equipment, net 169.4 187.6    
Goodwill 148.4 144.3    
Customer relationships, net 129.5 127.2    
Other intangible assets, net   0.3    
Non-current assets of discontinued operations   43.6    
Other assets, net 3.4 3.3    
Total assets 700.5 733.9    
Liabilities and Equity:        
Accounts payable 32.1 24.3    
Income taxes payable 2.3 2.2    
Accrued compensation 7.9 7.8    
Other accrued liabilities 31.4 32.9    
Current liabilities of discontinued operations   6.2    
Total current liabilities 73.7 73.4    
Lease financing obligation 46.9 44.0    
Deferred income taxes 31.6 30.6    
Pension and other post-retirement benefits 6.5 9.3    
Non-current liabilities of discontinued operations   35.6    
Other non-current liabilities 8.5 8.8    
Total liabilities 167.2 201.7    
Equity:        
Total Axiall stockholders' equity 456.3 457.4    
Noncontrolling interest 77.0 74.8    
Total equity 533.3 532.2    
Total liabilities and equity $ 700.5 $ 733.9