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Derivative Instruments and Hedging Activities (Narrative) (Details)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||||||
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Jun. 30, 2011
USD ($)
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Jun. 30, 2010
USD ($)
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Jun. 30, 2011
USD ($)
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Jun. 30, 2010
USD ($)
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Jun. 30, 2011
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Dec. 31, 2010
USD ($)
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Jun. 30, 2010
Increase [Member]
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
USD ($)
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Jun. 30, 2011
Twelve Month [Member]
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Jun. 30, 2011
Twenty Four Month [Member]
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Jun. 30, 2011
Accounts Receivable [Member]
USD ($)
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Jun. 30, 2011
Derivative Assets (Current) [Member]
Customer Supply Agreements [Member]
USD ($)
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Dec. 31, 2010
Derivative Assets (Current) [Member]
Customer Supply Agreements [Member]
USD ($)
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Jun. 30, 2011
Foreign Exchange Contract [Member]
USD ($)
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Dec. 31, 2010
Foreign Exchange Contract [Member]
USD ($)
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Jun. 30, 2010
Foreign Exchange Contract [Member]
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Jun. 30, 2011
Foreign Exchange Contracts (Hedge Designation) [Member]
USD ($)
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Jun. 30, 2011
Foreign Exchange Contracts (Hedge Designation) [Member]
USD ($)
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Jan. 11, 2011
Foreign Exchange Contracts (Hedge Designation) [Member]
CAD
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Jun. 30, 2011
Provisional Pricing Arrangements [Member]
USD ($)
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Jun. 30, 2011
Provisional Pricing Arrangements [Member]
USD ($)
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Jun. 30, 2010
Provisional Pricing Arrangements [Member]
Product Revenues [Member]
USD ($)
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Jun. 30, 2011
Changes in Fair Value of Foreign Currency Contracts [Member]
USD ($)
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Jun. 30, 2011
Changes in Fair Value of Foreign Currency Contracts [Member]
USD ($)
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Jun. 30, 2011
Accumulated Other Comprehensive Income [Member]
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Jun. 30, 2011
Customer Supply Agreements [Member]
Product Revenues [Member]
USD ($)
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Jun. 30, 2010
Customer Supply Agreements [Member]
Product Revenues [Member]
USD ($)
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Jun. 30, 2011
Customer Supply Agreements [Member]
Product Revenues [Member]
USD ($)
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Jun. 30, 2010
Customer Supply Agreements [Member]
Product Revenues [Member]
USD ($)
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Jun. 30, 2011
Product Revenues [Member]
USD ($)
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Jun. 30, 2010
Product Revenues [Member]
USD ($)
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Jun. 30, 2011
Product Revenues [Member]
USD ($)
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Jun. 30, 2010
Product Revenues [Member]
USD ($)
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| Percentage of hedging policy allowed anticipated operating cost | 75.00% | 50.00% | ||||||||||||||||||||||||||||||
| Notional amount of derivative | 4,700,000,000 | |||||||||||||||||||||||||||||||
| Gains remain in accumulated other comprehensive loss related to the effective cash flow hedge contracts prior to de-designation | 3,000,000 | 4,900,000 | ||||||||||||||||||||||||||||||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 387,000,000 | 429,900,000 | 488,200,000 | 797,100,000 | 289,400,000 | 309,400,000 | 46,500,000 | 48,400,000 | 71,100,000 | 68,300,000 | ||||||||||||||||||||||
| Foreign currency cash flow hedge gains to be reclassified to changes in fair value of foreign currency contracts during the next twelve months | 6,200,000 | |||||||||||||||||||||||||||||||
| Notional amounts of outstanding exchange rate contracts | 105,000,000 | 230,000,000 | ||||||||||||||||||||||||||||||
| Amount of Gain/(Loss) Recognized in Income on Derivative | (10,000,000) | (7,700,000) | 389,300,000 | 731,500,000 | 7,000,000 | 11,400,000 | 46,500,000 | 48,400,000 | 71,100,000 | 68,300,000 | ||||||||||||||||||||||
| Notional amount of hedged portion of purchase price | 135,000,000 | 135,000,000 | 70,000,000 | |||||||||||||||||||||||||||||
| Derivatives and currency hedges | 89,800,000 | 107,200,000 | ||||||||||||||||||||||||||||||
| Derivative Asset, Fair Value | 124,300,000 | 124,300,000 | 84,600,000 | 14,100,000 | ||||||||||||||||||||||||||||
| Accounts receivable | 317,200,000 | 317,200,000 | 352,300,000 | |||||||||||||||||||||||||||||
| Fair value of derivative assets | 93,900,000 | 93,900,000 | 45,600,000 | 64,000,000 | 45,600,000 | |||||||||||||||||||||||||||
| Derivative assets | 110,200,000 | 110,200,000 | 82,600,000 | 15,800,000 | 15,800,000 | |||||||||||||||||||||||||||
| Swap resulted in net realized gains | 41,500,000 | 93,100,000 | ||||||||||||||||||||||||||||||
| Foreign currency spot rate | 1.07 | 0.85 | 1.07 | |||||||||||||||||||||||||||||
| Reclassified gains from Accumulated other comprehensive loss related to contracts that settled during the year, recorded the amounts as Product revenues | $ 1,900,000 | $ 2,200,000 | ||||||||||||||||||||||||||||||