Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 94.0	$ 165.9
Derivative liability, fair value	25.3	23.0
Accounts Receivable [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	19.2	83.8
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	10.1	5.2
Designated as Hedging Instrument [Member] | Treasury Lock Agreements [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	9.5	3.5
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	9.5	3.5
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Derivative Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	10.1	5.2
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	83.9	160.7
Derivative liability, fair value	15.8	19.5
Not Designated as Hedging Instrument [Member] | Accounts Receivable [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	19.2	83.8
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
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Derivative Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	61.4	72.9
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	15.8	19.5
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Derivative Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 3.3	$ 1.2