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Debt, Credit Facility (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Line of Credit Facility, Covenant Compliance Our actual leverage for the four consecutive quarters ended March 31, 2013, was 1.7 which is below the maximum leverage of 3.5. Our actual interest coverage for the four consecutive quarters ended March 31, 2013, was 17.5 which is above the minimum interest coverage of 3.5. We were in compliance with all covenants at March 31, 2013.  
Long-term Debt $ 1,239.9 $ 914.5
Credit Agreement, covenant compliance, actual leverage ratio 1.7  
Credit Agreement, covenant terms, maximum leverage ratio 3.5  
Credit Agreement, covenant compliance, actual interest coverage ratio 17.5  
Credit Agreement, covenant terms, minimum interest coverage ratio 3.5  
2011 Credit Agreement [Member]
    
Line of Credit Facility [Line Items]    
Credit Agreement, available funds 971.7  
Letters of credit outstanding amount 73.3  
2011 Credit Agreement [Member]
    
Line of Credit Facility [Line Items]    
Long-term Debt $ 455.0 [1] $ 130.0 [1]
[1] Letters of credit outstanding under the 2011 Credit Agreement totaled $73.3 million and available funds under this facility were $971.7 million at March 31, 2013.