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Business Restructuring and Cost Reduction Plans (Carrying Amount of Accrual) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]                      
Charge $ 231.6 [1] $ 0 [1] $ 0 [1] $ 0 [1] $ 240.6 [1] $ 0 [1] $ 86.8 [1] $ 0 [1] $ 231.6 [2] $ 327.4 [2] $ 0 [2]
Plan 2013 [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge 231.6               231.6    
Amount reflected in pension liability                 (6.9)    
Noncash expenses                 (100.4)    
Cash expenditures                 (61.5)    
Currency translation adjustment                 0.4    
Accrued Balance 63.2               63.2    
Plan 2013 [Member] | Severance And Other Benefits [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge 71.9               71.9    
Amount reflected in pension liability                 (6.9)    
Cash expenditures                 (3.0)    
Currency translation adjustment                 0.4    
Accrued Balance 62.4               62.4    
Plan 2013 [Member] | Asset Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge 100.4               100.4    
Noncash expenses                 (100.4)    
Accrued Balance 0               0    
Plan 2013 [Member] | Contract Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge                 59.3    
Cash expenditures                 (58.5)    
Accrued Balance 0.8               0.8    
Plan 2013 [Member] | Contract Actions [Member] | Photovoltaic Market Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge 58.5                    
Plan 2012 [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge                   327.4  
Amount reflected in environmental liability                   (9.0) [3]  
Amount reflected in pension liability                   (7.5)  
Noncash expenses                   (87.0)  
Cash expenditures                 (185.8) (32.9)  
Currency translation adjustment                 0.3 (1.6)  
Accrued Balance 3.9       189.4       3.9 189.4  
Plan 2012 [Member] | Cost Reduction Plan [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge             86.8        
Plan 2012 [Member] | Photovoltaic Market Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         186.0 [4]            
Plan 2012 [Member] | Polyurethane Intermediates Business Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         54.6 [5]            
Plan 2012 [Member] | Severance And Other Benefits [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge                   83.5  
Amount reflected in environmental liability                   0  
Amount reflected in pension liability                   (7.5)  
Noncash expenses                   (0.4)  
Cash expenditures                 (40.4) (32.8)  
Currency translation adjustment                 0.3 (1.6)  
Accrued Balance 1.1       41.2       1.1 41.2  
Plan 2012 [Member] | Severance And Other Benefits [Member] | Cost Reduction Plan [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge             80.8        
Plan 2012 [Member] | Severance And Other Benefits [Member] | Photovoltaic Market Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         0            
Plan 2012 [Member] | Severance And Other Benefits [Member] | Polyurethane Intermediates Business Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         2.7            
Plan 2012 [Member] | Asset Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge                   67.3  
Amount reflected in environmental liability                   0  
Amount reflected in pension liability                   0  
Noncash expenses                   (67.3)  
Cash expenditures                 0 0  
Currency translation adjustment                 0 0  
Accrued Balance 0       0       0 0  
Plan 2012 [Member] | Asset Actions [Member] | Cost Reduction Plan [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge             6.0        
Plan 2012 [Member] | Asset Actions [Member] | Photovoltaic Market Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         34.7            
Plan 2012 [Member] | Asset Actions [Member] | Polyurethane Intermediates Business Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         26.6 [5]            
Plan 2012 [Member] | Contract Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge                   100.0  
Amount reflected in environmental liability                   0  
Amount reflected in pension liability                   0  
Noncash expenses                   0  
Cash expenditures                 (98.1) 0  
Currency translation adjustment                 0 0  
Accrued Balance 1.9       100.0       1.9 100.0  
Plan 2012 [Member] | Contract Actions [Member] | Cost Reduction Plan [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge             0        
Plan 2012 [Member] | Contract Actions [Member] | Photovoltaic Market Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         93.5            
Plan 2012 [Member] | Contract Actions [Member] | Polyurethane Intermediates Business Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         6.5            
Plan 2012 [Member] | Other Costs [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge                   76.6  
Amount reflected in environmental liability                   (9.0) [3]  
Amount reflected in pension liability                   0  
Noncash expenses                   (19.3)  
Cash expenditures                 (47.3) (0.1)  
Currency translation adjustment                 0 0  
Accrued Balance 0.9       48.2       0.9 48.2  
Plan 2012 [Member] | Other Costs [Member] | Cost Reduction Plan [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge             0        
Plan 2012 [Member] | Other Costs [Member] | Photovoltaic Market Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         57.8 [4]            
Plan 2012 [Member] | Other Costs [Member] | Polyurethane Intermediates Business Actions [Member]
                     
Restructuring Cost and Reserve [Line Items]                      
Charge         $ 18.8            
[1] For additional information, see Note 4, Business Restructuring and Cost Reduction Plans.
[2] Information about how this charge related to the businesses at the segment level is discussed in Note 4, Business Restructuring and Cost Reduction Plans.
[3]   Reflected in accrual for environmental obligations. See Note 17, Commitments and Contingencies.
[4]   Other includes the write-down of inventory to its net realizable value, the write-down of accounts receivable, and expected losses on purchase
[5]   Charge is net of $32.7 in proceeds received in cash at closing for certain PUI assets and the rights to a supply contract.