Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details)

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Mar. 31, 2020
Dec. 31, 2019
Commodity Contract [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 1.6  
Commodity Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 26.5 $ 3.2
Commodity Contract [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 3.4  
Foreign Exchange Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 1.6  
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 0.9  
Customer Supply Agreement [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 19.0 44.5
Provisional Pricing Arrangements [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.6 1.3
Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability   1.1
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 1.6  
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 26.5 3.2
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 3.4  
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 1.6  
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 0.9  
Fair Value, Inputs, Level 2 [Member] | Customer Supply Agreement [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset   0.0
Fair Value, Inputs, Level 2 [Member] | Provisional Pricing Arrangements [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset   0.0
Fair Value, Inputs, Level 2 [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability   0.0
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0  
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Customer Supply Agreement [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 19.0 44.5
Fair Value, Inputs, Level 3 [Member] | Provisional Pricing Arrangements [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.6 1.3
Fair Value, Inputs, Level 3 [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability   1.1
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.3 0.0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability (25.9) (3.2)
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability (2.8) 0.0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability (1.6) 0.0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability (0.9) 0.0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Derivative Asset [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 1.3 0.0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability (0.6) 0.0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability (0.6) 0.0
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 19.0 44.5
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.6 1.3
Derivative liability $ 0.0 $ (1.1)