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Debt, Credit Facility (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Line of Credit Facility [Line Items]    
Long-term Debt $ 810.8 $ 798.6
Credit Agreement, covenant compliance Our actual leverage for the four consecutive quarters ended September 30, 2012, was 1.3 which is below the maximum leverage of 3.5. Our actual interest coverage for the four consecutive quarters ended September 30, 2012, was 17.3 which is above the minimum interest coverage of 3.5. We were in compliance with all covenants at September 30, 2012.  
Credit Agreement, covenant compliance, actual leverage ratio 1.3  
Credit Agreement, covenant terms, maximum leverage ratio 3.5  
Credit Agreement, covenant compliance, actual interest coverage ratio 17.3  
Credit Agreement, covenant terms, minimum interest coverage ratio 3.5  
2011 Credit Agreement [Member]
   
Line of Credit Facility [Line Items]    
Credit Agreement, available funds 1,402.6 1,424.5
Letters of credit outstanding amount 73.4 75.5
2011 Credit Agreement [Member]
   
Line of Credit Facility [Line Items]    
Long-term Debt $ 24.0 $ 0