DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 78.6	$ 165.9
Derivative liability, fair value	13.2	23.0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	16.2	5.2
Derivative liability, fair value	1.9	3.5
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	62.4	160.7
Derivative liability, fair value	11.3	19.5
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value
Significant Other Observable Inputs (Level 2) [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Derivative Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	16.2	5.2
Significant Other Observable Inputs (Level 2) [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	1.9	3.5
Significant Other Observable Inputs (Level 2) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Derivative Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value		2.8
Significant Other Observable Inputs (Level 2) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value
Market Approach [Member] | Managements Estimate Of 62% Fee [Member] | Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Derivative Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	3.5	1.2
Market Approach [Member] | Managements Estimate Of 62% Fee [Member] | Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Accounts Receivable [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value		83.8
Market Approach [Member] | Managements Estimate Of 62% Fee [Member] | Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	11.3	19.5
Market Approach [Member] | Hot-Rolled Steel Estimate [Member] | Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value
Market Approach [Member] | Hot-Rolled Steel Estimate [Member] | Significant Unobservable Inputs (Level 3) [Member] | Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member] | Derivative Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 58.9	$ 72.9