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Debt, Credit Facility (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Line of Credit Facility [Line Items]  
Long-term Debt$ 541,000,000$ 619,400,000
Credit Agreement, covenant complianceOur actual leverage for the four consecutive quarters ended September 30, 2011, was 1.0 which is below the maximum leverage of 3.5. Our actual interest coverage for the four consecutive quarters ended September 30, 2011, was 14.8 which is above the minimum interest coverage of 3.5. We were in compliance with all covenants at September 30, 2011. 
Credit Agreement, covenant compliance, actual leverage ratio1.0 
Credit Agreement, covenant terms, maximum leverage ratio3.5 
Credit Agreement, covenant compliance, actual interest coverage ratio14.8 
Credit Agreement, covenant terms, minimum interest coverage ratio3.5 
2011 Credit Agreement [Member]
  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Current Borrowing Capacity1,500,000,000 
Credit Agreement, available funds1,369,000,000 
Letters of credit outstanding amount120,100,000 
Line of Credit Facility, Maximum Borrowing Capacity2,250,000,000 
Terminated Domestic and European Credit Agreements [Member]
  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity915,000,000 
European credit agreement [Member]
  
Line of Credit Facility [Line Items]  
Credit Agreement, outstanding borrowings00
Credit Agreement, available funds 289,100,000
Domestic credit agreement [Member]
  
Line of Credit Facility [Line Items]  
Credit Agreement, outstanding borrowings00
Credit Agreement, available funds 469,600,000
Letters of credit outstanding amount $ 130,400,000