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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Mar. 31, 2012
Derivatives - Cash Flow Hedges [Member]
Mar. 31, 2011
Derivatives - Cash Flow Hedges [Member]
Mar. 31, 2012
Derivatives - Cash Flow Hedges [Member]
Cost of Goods Sold [Member]
Mar. 31, 2011
Derivatives - Cash Flow Hedges [Member]
Cost of Goods Sold [Member]
Mar. 31, 2012
Interest Rate Contract Gains [Member]
Derivatives - Fair Value Hedges [Member]
Interest Expense [Member]
Mar. 31, 2011
Interest Rate Contract Gains [Member]
Derivatives - Fair Value Hedges [Member]
Interest Expense [Member]
Mar. 31, 2012
Commodity Contracts [Member]
Derivatives Not Designated as Hedging Instruments [Member]
Cost of Goods Sold [Member]
Mar. 31, 2011
Commodity Contracts [Member]
Derivatives Not Designated as Hedging Instruments [Member]
Cost of Goods Sold [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Interest Rate Contract Gains [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Gains [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Gains [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Gains [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Losses [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Gains [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Current Installments of Long-term Debt [Member]
Interest Rate Contract Loss [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Current Installments of Long-term Debt [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Current Installments of Long-term Debt [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Gains [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Gains [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Gains [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Losses [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Long-term Debt [Member]
Interest Rate Contract Loss [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Long-term Debt [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2011
Designated as Hedging Instrument [Member]
Long-term Debt [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Interest Rate Contract Gains [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Losses [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Gains [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Loss [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Interest Rate Contract Gains [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Interest Rate Contract Gains [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Interest Rate Contract Loss [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Interest Rate Contract Loss [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Interest Rate Contract Loss [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Losses [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2011
Not Designated as Hedging Instrument [Member]
Accrued Liabilities [Member]
Commodity Contracts Losses [Member]
Mar. 31, 2012
Forward Contracts Buy Foreign Currencies [Member]
Dec. 31, 2011
Forward Contracts Buy Foreign Currencies [Member]
Mar. 31, 2011
Forward Contracts Buy Foreign Currencies [Member]
Mar. 31, 2012
Forward Contracts Sell Foreign Currencies [Member]
Dec. 31, 2011
Forward Contracts Sell Foreign Currencies [Member]
Mar. 31, 2011
Forward Contracts Sell Foreign Currencies [Member]
Dec. 31, 2011
Variable Interest Rate Swaps $75M [Member]
Dec. 31, 2011
Fixed Interest Rate Swap $75M [Member]
Mar. 31, 2012
Interest Rate Swaps Designated As Fair Value Hedges [Member]
Dec. 31, 2011
Interest Rate Swaps Designated As Fair Value Hedges [Member]
Mar. 31, 2011
Interest Rate Swaps Designated As Fair Value Hedges [Member]
Mar. 31, 2012
Copper Commodity Forward Contracts [Member]
Dec. 31, 2011
Copper Commodity Forward Contracts [Member]
Mar. 31, 2011
Copper Commodity Forward Contracts [Member]
Mar. 31, 2012
Zinc Commodity Forward Contracts [Member]
Dec. 31, 2011
Zinc Commodity Forward Contracts [Member]
Mar. 31, 2011
Zinc Commodity Forward Contracts [Member]
Mar. 31, 2012
Natural Gas Commodity Forward Contracts [Member]
Dec. 31, 2011
Natural Gas Commodity Forward Contracts [Member]
Mar. 31, 2011
Natural Gas Commodity Forward Contracts [Member]
Mar. 31, 2012
Lead Commodity Forward Contracts [Member]
Dec. 31, 2011
Lead Commodity Forward Contracts [Member]
Mar. 31, 2011
Lead Commodity Forward Contracts [Member]
Mar. 31, 2012
Variable Interest Rate Swaps $125M [Member]
Mar. 31, 2012
Fixed Interest Rate Swaps $125M [Member]
Derivative [Line Items]                                                                                                                                                                                    
Notional amount                                                                                                                                   $ 0 $ 0 $ 0 $ 8.1 $ 0 $ 0 $ 75.0 $ 75.0 $ 73.1 $ 80.8 $ 132.7 $ 42.6 $ 52.1 $ 43.3 $ 6.5 $ 7.3 $ 4.1 $ 10.3 $ 8.3 $ 3.1 $ 35.4 $ 37.9 $ 29.2 $ 125.0 $ 125.0
Gain on variable interest rate swaps dedesignation                                                                                                                                               7.9                                 11.0  
Amount of gain included in current installments of long-term debt                                                                                                                                                                                 10.0  
Notional amount of interest rate derivatives with Wells Fargo                                                                                                                                                   73.1                                
Cash flow hedges [Abstract]                                                                                                                                                                                    
Amount of commodity forward contracts with Wells Fargo 83.5                                                                                                                                                                                  
Gain if all open futures contracts were settled 1.8                                                                                                                                                                                  
Approximate amount of deferred gains would be reclassified into earnings during the next twelve months 1.0                                                                                                                                                                                  
Fair value hedges [Abstract]                                                                                                                                                                                    
Amount of terminated interest rate swaps on our industrial revenue bonds 7.7                                                                                                                                                                                  
Gain on terminated interest rate swaps on our industrial revenue bonds 0.2                                                                                                                                                                                  
Derivatives, Fair Value [Line Items]                                                                                                                                                                                    
Asset Derivatives 11.7 13.8 20.6                 1.8 2.2 17.8 0 0 0 0 0 14.3 0 0 (0.5) 1.8 2.2 4.0                         9.9 11.6 2.8 0 0 2.8 0 0 0 11.0 11.6 0 (1.1) 0 0                                                                          
Liability Derivatives 16.2 23.9 7.0                 13.8 21.4 6.1                         0 0 2.1 (3.6) (2.5) 0 5.4 11.2 0 12.0 12.7 4.0 2.4 2.5 0.9                         0 0 0 0 1.0 0 0 0 0.9 2.4 1.5 0                                                  
Derivative Instruments, Gain (Loss) [Line Items]                                                                                                                                                                                    
Recognized in other comprehensive loss (effective portion)       4.2 0.7                                                                                                                                                                          
Reclassified from accumulated other comprehensive loss into income (effective portion)           (2.7) 5.8                                                                                                                                                                      
Amount of gain (loss)               0.9 1.6 (2.9) (0.2)                                                                                                                                                              
Credit risk and collateral [Abstract]                                                                                                                                                                                    
Amounts recognized in other current assets or (accrued liabilities) for cash collateral provided by us to counterparties. (0.3) (3.9)                                                                                                                                                                                
Amounts recognized in other current assets or (accrued liabilities) for cash collateral provided to us by counterparties     $ 1.1