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Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Debt    
Total $ 1,532.8 $ 1,332.8
Less: unamortized discount (1.6) (1.6)
Less: amounts due within one year and short-term borrowings (12.2) (12.2)
Total long-term debt 1,519.0 1,319.0
Unsecured revolving credit facility due July 26, 2016
   
Debt    
Total 845.0 645.0
Senior unsecured notes due July 2, 2013
   
Debt    
Total 75.0 75.0
Senior unsecured notes due November 15, 2016
   
Debt    
Total 350.0 350.0
Senior unsecured notes due November 15, 2036
   
Debt    
Total 250.0 250.0
Other notes and revolving credit facilities
   
Debt    
Total $ 12.8 $ 12.8