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Debt (Tables)
6 Months Ended
Jun. 30, 2011
Debt [Abstract]  
Long-term debt
                 
    June 30,
    December 31,
 
    2011     2010  
 
Senior Notes due 2019
  $ 500.0     $ 500.0  
Senior Notes due 2039
    500.0       500.0  
Debt discount
    (1.2 )     (1.2 )
Interest rate swaps
    5.5       1.5  
Senior Credit Facility
    143.0       141.8  
                 
Total long-term debt
  $ 1,147.3     $ 1,142.1