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Debt (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Debt  
Total$ 1,479.8$ 943.1
Less: unamortized discount(1.7)(1.8)
Less: amounts due within one year and short-term borrowings(14.2)(86.2)
Total long-term debt1,463.9855.1
Unsecured revolving credit facility due July 26, 2016
  
Debt  
Total790.0 
Unsecured revolving credit facility due November 9, 2012
  
Debt  
Total 195.0
Senior unsecured notes due from July 1, 2011 to July 2, 2013.
  
Debt  
Total75.0135.0
Senior unsecured notes due November 15, 2016
  
Debt  
Total350.0350.0
Senior unsecured notes due November 15, 2036
  
Debt  
Total250.0250.0
Other notes and revolving credit facilities
  
Debt  
Total$ 14.8$ 13.1