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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation plan investments $ 41.0 $ 46.7
Available-for-sale investment   5.0
Derivative financial instruments, Assets 0.1  
Derivative financial instruments, Liabilities 16.6 36.9
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation plan investments 41.0 46.7
Available-for-sale investment   5.0
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments, Assets 0.1  
Derivative financial instruments, Liabilities $ 16.6 $ 36.9