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Fair Value Of Financial Instruments (Schedule Of Fair Values Of Financial Assets And Liabilities Measured On A Recurring Basis) (Detail) (Fair Value [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash surrender value of life insurance policies $ 12.9 $ 11.9
Earn-out Arrangements [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 165.9 143.6
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 3.9 3.3
Auction Rate Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Auction rate securities 9.3 14.4
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash surrender value of life insurance policies 12.9 11.9
Level 1 [Member] | Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 3.9 3.3
Level 3 [Member] | Earn-out Arrangements [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 165.9 143.6
Level 3 [Member] | Auction Rate Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Auction rate securities $ 9.3 $ 14.4