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Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt    
Total $ 2,338.0 $ 1,208.9
Less: unamortized discount (3.5) (1.5)
Less: amounts due within one year and short-term borrowings (114.6) (83.6)
Total long-term debt 2,219.9 1,123.8
Unsecured revolving credit facility due April 4, 2018
   
Debt    
Total 600.0 525.0
Senior unsecured term loan due from September 30, 2013 to April 4, 2018
   
Debt    
Total 493.8  
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 April 15, 2023
   
Debt    
Total 500.0  
Senior unsecured notes due November 15, 2036
   
Debt    
Total 250.0 250.0
Other notes and revolving credit facilities
   
Debt    
Total $ 69.2 $ 8.9