v3.5.0.2
Guarantor Information - Guarantor Condensed Consolidating Balance Sheet Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets:        
Cash and cash equivalents $ 128.4 $ 258.0 $ 131.4 $ 166.8
Receivables, net of allowance for doubtful accounts 455.0 355.3    
Inventories 276.0 280.9    
Prepaid expenses and other 100.5 58.9    
Current assets of discontinued operations 0.8 36.9    
Total current assets 960.7 990.0    
Property, plant and equipment, net 1,558.8 1,556.5    
Goodwill 856.4 852.1    
Customer relationships, net 923.2 950.3    
Other intangible assets, net 60.8 63.4    
Non-current assets of discontinued operations   62.0    
Other assets, net 81.7 65.1    
Total assets 4,441.6 4,539.4    
Liabilities and Equity:        
Current portion of long-term debt 2.5 2.5    
Accounts payable 256.3 244.8    
Interest payable 15.2 15.4    
Income taxes payable 2.4 2.2    
Accrued compensation 60.2 41.0    
Other accrued liabilities 135.9 94.7    
Current liabilities of discontinued operations 6.8 15.5    
Total current liabilities 479.3 416.1    
Long-term debt, excluding the current portion of long-term debt 1,364.8 1,364.5    
Lease financing obligation 46.8 44.0    
Deferred income taxes 661.1 683.0    
Pension and other post-retirement benefits 189.7 202.8    
Non-current liabilities of discontinued operations   35.6    
Other non-current liabilities 132.3 140.3    
Total liabilities 2,874.0 2,886.3    
Equity:        
Total Axiall stockholders' equity 1,497.1 1,578.3    
Noncontrolling interest 70.5 74.8    
Total equity 1,567.6 1,653.1    
Total liabilities and equity 4,441.6 4,539.4    
Eliminations [Member]        
Assets:        
Receivables, net of allowance for doubtful accounts (195.6) (97.6)    
Prepaid expenses and other   (0.4)    
Total current assets (195.6) (98.0)    
Long-term receivables-affiliates (900.0) (900.0)    
Investment in subsidiaries (1,644.9) (1,708.7)    
Total assets (2,740.5) (2,706.7)    
Liabilities and Equity:        
Accounts payable (195.6) (97.6)    
Income taxes payable   (0.4)    
Total current liabilities (195.6) (98.0)    
Long-term payables-affiliates (900.0) (900.0)    
Other non-current liabilities (9.5) (7.2)    
Total liabilities (1,105.1) (1,005.2)    
Equity:        
Total Axiall stockholders' equity (1,635.4) (1,701.5)    
Total equity (1,635.4) (1,701.5)    
Total liabilities and equity (2,740.5) (2,706.7)    
Parent Company [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents   0.3    
Receivables, net of allowance for doubtful accounts 49.4 27.1    
Prepaid expenses and other 0.5 0.7    
Total current assets 49.9 28.1    
Property, plant and equipment, net 10.1 11.0    
Long-term receivables-affiliates 900.0 900.0    
Other assets, net 4.5 5.6    
Investment in subsidiaries 1,177.0 1,235.5    
Total assets 2,141.5 2,180.2    
Liabilities and Equity:        
Accounts payable 127.1 81.7    
Interest payable 3.1 3.2    
Accrued compensation 1.3 9.5    
Other accrued liabilities 34.4 16.2    
Total current liabilities 165.9 110.6    
Long-term debt, excluding the current portion of long-term debt 444.6 444.2    
Deferred income taxes 19.3 18.0    
Pension and other post-retirement benefits 3.3 3.6    
Other non-current liabilities 11.3 25.5    
Total liabilities 644.4 601.9    
Equity:        
Total Axiall stockholders' equity 1,497.1 1,578.3    
Total equity 1,497.1 1,578.3    
Total liabilities and equity 2,141.5 2,180.2    
Eagle Spinco Inc [Member] | Reportable Legal Entities [Member]        
Assets:        
Receivables, net of allowance for doubtful accounts 9.1 5.5    
Total current assets 9.1 5.5    
Other assets, net 1.7 1.7    
Investment in subsidiaries 1,795.1 1,833.3    
Total assets 1,805.9 1,840.5    
Liabilities and Equity:        
Accounts payable 49.3 27.0    
Interest payable 12.1 12.2    
Total current liabilities 61.4 39.2    
Long-term debt, excluding the current portion of long-term debt 679.2 678.4    
Long-term payables-affiliates 900.0 900.0    
Total liabilities 1,640.6 1,617.6    
Equity:        
Total Axiall stockholders' equity 165.3 222.9    
Total equity 165.3 222.9    
Total liabilities and equity 1,805.9 1,840.5    
Guarantor Subsidiaries Excluding Eagle Spinco Inc [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents 24.9 161.7 81.1 78.2
Receivables, net of allowance for doubtful accounts 515.7 377.8    
Inventories 218.2 217.6    
Prepaid expenses and other 92.1 55.9    
Current assets of discontinued operations 0.8 19.3    
Total current assets 851.7 832.3    
Property, plant and equipment, net 1,380.3 1,357.9    
Goodwill 707.8 707.8    
Customer relationships, net 795.6 823.1    
Other intangible assets, net 60.8 63.1    
Non-current assets of discontinued operations   18.4    
Other assets, net 73.9 56.2    
Investment in subsidiaries 467.9 473.2    
Total assets 4,338.0 4,332.0    
Liabilities and Equity:        
Current portion of long-term debt 2.5 2.5    
Accounts payable 236.3 214.9    
Income taxes payable   0.4    
Accrued compensation 51.6 23.7    
Other accrued liabilities 79.6 45.6    
Current liabilities of discontinued operations 6.8 9.3    
Total current liabilities 376.8 296.4    
Long-term debt, excluding the current portion of long-term debt 240.9 241.9    
Deferred income taxes 612.1 636.1    
Pension and other post-retirement benefits 179.7 189.9    
Other non-current liabilities 121.9 113.2    
Total liabilities 1,531.4 1,477.5    
Equity:        
Total Axiall stockholders' equity 2,806.6 2,854.5    
Total equity 2,806.6 2,854.5    
Total liabilities and equity 4,338.0 4,332.0    
Guarantor Subsidiaries Including Eagle Spinco Inc [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents 24.9 161.7 81.1 78.2
Receivables, net of allowance for doubtful accounts 515.7 377.8    
Inventories 218.2 217.6    
Prepaid expenses and other 92.1 55.9    
Current assets of discontinued operations 0.8 19.3    
Total current assets 851.7 832.3    
Property, plant and equipment, net 1,380.3 1,357.9    
Goodwill 707.8 707.8    
Customer relationships, net 795.6 823.1    
Other intangible assets, net 60.8 63.1    
Non-current assets of discontinued operations   18.4    
Other assets, net 73.9 56.2    
Investment in subsidiaries 467.9 473.2    
Total assets 4,338.0 4,332.0    
Liabilities and Equity:        
Current portion of long-term debt 2.5 2.5    
Accounts payable 276.5 236.4    
Interest payable 12.1 12.2    
Income taxes payable   0.4    
Accrued compensation 51.6 23.7    
Other accrued liabilities 79.6 45.6    
Current liabilities of discontinued operations 6.8 9.3    
Total current liabilities 429.1 330.1    
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 610.3 634.4    
Pension and other post-retirement benefits 179.7 189.9    
Other non-current liabilities 121.9 113.2    
Total liabilities 3,161.2 3,087.9    
Equity:        
Total Axiall stockholders' equity 1,176.8 1,244.1    
Total equity 1,176.8 1,244.1    
Total liabilities and equity 4,338.0 4,332.0    
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Assets:        
Cash and cash equivalents 103.5 96.0 $ 50.3 $ 88.6
Receivables, net of allowance for doubtful accounts 85.5 48.0    
Inventories 57.8 63.3    
Prepaid expenses and other 7.9 2.7    
Current assets of discontinued operations   17.6    
Total current assets 254.7 227.6    
Property, plant and equipment, net 168.4 187.6    
Goodwill 148.6 144.3    
Customer relationships, net 127.6 127.2    
Other intangible assets, net   0.3    
Non-current assets of discontinued operations   43.6    
Other assets, net 3.3 3.3    
Total assets 702.6 733.9    
Liabilities and Equity:        
Accounts payable 48.3 24.3    
Income taxes payable 2.4 2.2    
Accrued compensation 7.3 7.8    
Other accrued liabilities 21.9 32.9    
Current liabilities of discontinued operations   6.2    
Total current liabilities 79.9 73.4    
Lease financing obligation 46.8 44.0    
Deferred income taxes 31.5 30.6    
Pension and other post-retirement benefits 6.7 9.3    
Non-current liabilities of discontinued operations   35.6    
Other non-current liabilities 8.6 8.8    
Total liabilities 173.5 201.7    
Equity:        
Total Axiall stockholders' equity 458.6 457.4    
Noncontrolling interest 70.5 74.8    
Total equity 529.1 532.2    
Total liabilities and equity $ 702.6 $ 733.9