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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2010
Dec. 31, 2011
Dec. 31, 2010
Apr. 30, 2010
Dec. 31, 2011
Cash Flow Hedging [Member]
Dec. 31, 2010
Cash Flow Hedging [Member]
Dec. 31, 2009
Cash Flow Hedging [Member]
Dec. 31, 2011
Cash Flow Hedging [Member]
Cost of goods sold [Member]
Dec. 31, 2010
Cash Flow Hedging [Member]
Cost of goods sold [Member]
Dec. 31, 2009
Cash Flow Hedging [Member]
Cost of goods sold [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Dec. 31, 2009
Not Designated as Hedging Instrument [Member]
Dec. 31, 2011
Variable Interest Rate Swaps 75 M [Member]
Dec. 31, 2011
Variable Interest Rate Swaps 125 M [Member]
Dec. 31, 2011
Fixed Interest Rate Swaps 75 M [Member]
Dec. 31, 2011
Fixed Interest Rate Swaps 125 M [Member]
Dec. 31, 2011
Copper Commodity Forward Contracts [Member]
Dec. 31, 2010
Copper Commodity Forward Contracts [Member]
Dec. 31, 2011
Zinc Commodity Forward Contracts [Member]
Dec. 31, 2010
Zinc Commodity Forward Contracts [Member]
Dec. 31, 2011
Lead Commodity Forward Contracts [Member]
Dec. 31, 2010
Lead Commodity Forward Contracts [Member]
Dec. 31, 2011
Natural Gas Commodity Forward Contracts [Member]
Dec. 31, 2010
Natural Gas Commodity Forward Contracts [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Dec. 31, 2011
Forward Contracts Buy Foreign Currency [Member]
Dec. 31, 2010
Forward Contracts Buy Foreign Currency [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Fair Value Hedging [Member]
Interest Expense [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Fair Value Hedging [Member]
Interest Expense [Member]
Dec. 31, 2009
Interest Rate Contracts [Member]
Fair Value Hedging [Member]
Interest Expense [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Interest Expense [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Interest Expense [Member]
Dec. 31, 2009
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Interest Expense [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Other Assets [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Other Assets [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Current Installments of Long-term Debt [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Current Installments of Long-term Debt [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Long-term Debt [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Designated as Hedging Instrument [Member]
Long-term Debt [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2011
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Dec. 31, 2010
Interest Rate Contracts [Member]
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Dec. 31, 2011
Commodity Contracts Gains [Member]
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2010
Commodity Contracts Gains [Member]
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2011
Commodity Contracts Gains [Member]
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2010
Commodity Contracts Gains [Member]
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2011
Commodity Contracts Gains [Member]
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2010
Commodity Contracts Gains [Member]
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2011
Commodity Contracts Gains [Member]
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2010
Commodity Contracts Gains [Member]
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2011
Commodity Contracts Losses [Member]
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2010
Commodity Contracts Losses [Member]
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2011
Commodity Contracts Losses [Member]
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2010
Commodity Contracts Losses [Member]
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2011
Commodity Contracts Losses [Member]
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2010
Commodity Contracts Losses [Member]
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Dec. 31, 2011
Commodity Contracts Losses [Member]
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2010
Commodity Contracts Losses [Member]
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Dec. 31, 2011
Commodity Contract [Member]
Dec. 31, 2011
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Cost of goods sold [Member]
Dec. 31, 2010
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Cost of goods sold [Member]
Dec. 31, 2009
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Cost of goods sold [Member]
Dec. 31, 2011
SunBelt Notes [Member]
Derivatives, Fair Value [Line Items]                                                                                                                                                        
Notional amount                                                           $ 0 $ 0.3 $ 80.8 $ 132.7                                                                                     $ 73.1
Asset Derivatives   13.8 26.0                                             2.2 22.2 11.6 3.8                     0 0 2.2 5.3         0 3.8 11.6 0         0 16.9     0 0     0 0     0 0              
Liability Derivatives   23.9 9.5                                             21.4 8.1 2.5 1.4                             0 2.8 12.7 5.3         0 1.2 1.0 0     (2.5) 0     0 (0.1)     11.2 0     1.5 0.3          
Notional amount of interest rate derivatives with Citibank                                                               7.7                                                                                        
Notional amount of derivatives with Wells Fargo                                                               73.1                                                                               80.1        
Derivative [Line Items]                                                                                                                                                        
Gain on variable interest rate swaps                           7.9 11.0                                                                                                                          
Amount of gain included in long-term debt       0.3                     10.5                                                                                                                          
Notional amount                           75.0 125.0 75.0 125.0 52.1 25.1 7.3 3.2 37.9 19.6 8.3 5.5                                                                                                      
Cash flow hedges [Abstract]                                                                                                                                                        
Losses if all open futures contracts were settled   8.8                                                                                                                                                    
Approximate amount of deferred losses would be reclassified into earnings during the next twelve months   (6.9)                                                                                                                                                    
Fair value hedges [Abstract]                                                                                                                                                        
Amount of terminated interest rate swaps on our industrial revenue bonds       18.9                                                                                                                                                
Gain on terminated interest rate swaps on our industrial revenue bonds       0.4                                                                                                                                                
Gain on terminated interest rate swaps recognized in interest expense upon redemption of our industrial revenue bonds 0.3                                                                                                                                                      
Derivative Instruments, Gain (Loss) [Line Items]                                                                                                                                                        
Recognized in other comprehensive loss (effective portion)         (17.3) 8.8 39.3                                                                                                                                          
Reclassified from accumulated other comprehensive loss into income (effective portion)               10.3 8.8 (20.4)                                                                                                                                    
Recognized in income (ineffective portion)               0 0 0.1                                                                                                                                    
Amount of gain (loss)         10.3 8.8 (20.3)       (1.7) (0.8) (2.7)                                         6.7 6.7 3.4 0.5 0.3 (0.4)                                                                   (2.2) (1.1) (2.3)  
Credit risk and collateral [Abstract]                                                                                                                                                        
Amounts recognized in other current assets or (accrued liabilities) for cash collateral provided to us by counterparties     3.2                                                                                                                                                  
Amounts recognized in other current assets or (accrued liabilities) for cash colleteral provided by us to counterparties   $ (3.9)