SEGMENT INFORMATION (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 47 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Segment Reporting Information [Line Items]                  
Total sales $ 593.6     $ 670.7     $ 1,741.4 $ 1,952.9  
Income before taxes [Abstract]                  
Income from continuing operations before taxes 40.3     93.0     143.3 219.5  
Environmental expense (1.6)     (0.7)     (6.3) (4.9)  
Restructuring charges (1.2) (2.3) (1.0) (1.6) (0.2) (2.3) (4.5) (4.1) (63.4)
Other operating (expense) income 0     (0.4)     0.8 1.3  
Interest expense (17.7)     (9.9)     (37.0) (28.7)  
Interest income 0.2     0.1     0.9 0.3  
Other (expense) income 0     (1.9)     0.1 (6.3)  
Chlor Alkali Products
                 
Segment Reporting Information [Line Items]                  
Total sales 329.2     374.2     996.0 1,090.1  
Income before taxes [Abstract]                  
Income from continuing operations before taxes 26.2     64.4     101.3 173.1  
Chemical Distribution
                 
Segment Reporting Information [Line Items]                  
Total sales 76.6     101.9     221.4 325.7  
Income before taxes [Abstract]                  
Income from continuing operations before taxes 0.8     3.4     0 9.7  
Winchester
                 
Segment Reporting Information [Line Items]                  
Total sales 209.6     213.1     591.2 599.2  
Income before taxes [Abstract]                  
Income from continuing operations before taxes 38.5     40.7     109.9 109.1  
Intersegment Elimination
                 
Segment Reporting Information [Line Items]                  
Total sales (21.8)     (18.5)     (67.2) (62.1)  
CorporateOther
                 
Income before taxes [Abstract]                  
Pension income 8.8     7.3     24.2 20.0  
Environmental expense (1.6)     (0.7)     (6.3) (4.9)  
Other corporate and unallocated costs (13.7)     (8.4)     (46.1) (50.0)  
Restructuring charges $ (1.2)     $ (1.6)     $ (4.5) $ (4.1)