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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair Value Measurements
                                                                 
    Fair Value                             Fair Value                    
    September 30,                             December 31,                    
    2011     Level 1     Level 2     Level 3     2010     Level 1     Level 2     Level 3  
Cash Equivalents (1)
  $     $     $     $     $ 596.2     $ 596.2     $     $  
Derivative Financial Instruments (2)
                                                               
Cash Flow Hedges
    (0.3 )           (0.3 )           30.6             30.6        
Other Forward Contracts
    (0.7 )           (0.7 )           (0.2 )           (0.2 )      
Rabbi Trust Assets (3)
    53.2       53.2                   55.3       55.3              
Long-term debt (4)
    (2,861.4 )           (2,861.4 )           (2,531.8 )           (2,531.8 )      
 
(1)   Because of their short maturities, the carrying value of these assets approximates fair value.
 
(2)   See Note 18, “Derivatives and Hedging Activities”. Estimates of the fair value of the derivative financial instruments represent the Company’s best estimates based on its valuation models, which incorporate industry data and trends and relevant market rates and transactions.
 
(3)   Rabbi trust assets include mutual funds and cash equivalents for payment of certain non-qualified benefits for retired, terminated and active employees. The fair value of these assets was based on quoted market prices.
 
(4)   The carrying amount of the Company’s long-term debt was $2,369.7 million and $2,339.6 million at September 30, 2011 and December 31, 2010, respectively. The fair value of long-term debt is based on quoted market prices or on rates available to the Company for debt with similar terms and maturities.