v3.5.0.2
Earnings (Loss) Per Share - Reconciliation of Numerators and Denominators Used for Basic and Diluted Earnings (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator        
Income (loss) from continuing operations $ (27.3) $ 22.8 $ (57.6) $ 20.4
Less: net income attributable to noncontrolling interest 0.5 1.3 0.8 3.1
Income (loss) from continuing operations attributable to Axiall (27.8) 21.5 (58.4) 17.3
Net loss from discontinued operations   (0.9) (23.0) (7.3)
Consolidated net income (loss) attributable to Axiall $ (27.8) $ 20.6 $ (81.4) $ 10.0
Denominator        
Weighted average common shares outstanding, basic 70.6 70.4 70.6 70.3
Dilutive impact of stock options and other share-based awards   0.5   0.6
Weighted average common shares outstanding, diluted 70.6 70.9 70.6 70.9
Basic earnings (loss) per share attributable to Axiall:        
Basic earnings (loss) per share from continuing operations $ (0.39) $ 0.30 $ (0.83) $ 0.25
Basic loss per share from discontinued operations   (0.01) (0.32) (0.11)
Basic earnings (loss) per share attributable to Axiall (0.39) 0.29 (1.15) 0.14
Diluted earnings (loss) per share attributable to Axiall:        
Diluted earnings (loss) per share from continuing operations (0.39) 0.30 (0.83) 0.25
Diluted loss per share from discontinued operations   (0.01) (0.32) (0.11)
Diluted earnings (loss) per share attributable to Axiall $ (0.39) $ 0.29 $ (1.15) $ 0.14