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Derivative Financial Instruments and Fair Value Measurements (Details)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Dec. 31, 2011
USD ($)
Mar. 31, 2012
Recurring Basis [Member]
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
USD ($)
Dec. 31, 2011
Recurring Basis [Member]
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
USD ($)
Mar. 31, 2012
Recurring Basis [Member]
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Dec. 31, 2011
Recurring Basis [Member]
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Mar. 31, 2012
Recurring Basis [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Dec. 31, 2011
Recurring Basis [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Mar. 31, 2012
Carrying Amount [Member]
Euro-denominated Note EUR300 [Member]
USD ($)
Mar. 31, 2012
Carrying Amount [Member]
Euro-denominated Note EUR300 [Member]
EUR (€)
Mar. 31, 2012
Carrying Amount [Member]
Euro-denominated Note EUR200 [Member]
USD ($)
Mar. 31, 2012
Carrying Amount [Member]
Euro-denominated Note EUR200 [Member]
EUR (€)
Mar. 31, 2012
Carrying Amount [Member]
Euro-denominated Notes Total [Member]
USD ($)
Dec. 31, 2011
Carrying Amount [Member]
Euro-denominated Notes Total [Member]
USD ($)
Mar. 31, 2012
Fair Value [Member]
Euro-denominated Notes Total [Member]
USD ($)
Dec. 31, 2011
Fair Value [Member]
Euro-denominated Notes Total [Member]
USD ($)
Derivative Financial Instruments and Fair Value Measurements [Abstract]                                  
Gain associated with forward contracts included in Interest and Other Expenses $ 0.7 $ 0                              
Net investment hedges [Abstract]                                  
Long-term Debt                   400.2 300.0 266.6 200.0 666.8 647.6 676.6 654.9
Gain/(Loss) from economic hedges included in Accumulated Other Comprehensive Income, net of taxes (23.1)   (11.4)                            
Assets [Abstract]                                  
Available-for-sale securities 0.4   0.4 0.4 0.4 0 0 0 0                
Foreign currency forward contracts 0.6   0 0 0 0.6 0 0 0                
Deferred compensation plan assets 52.0   45.2 52.0 45.2 0 0 0 0                
Total assets 53.0   45.6 52.4 45.6 0.6 0 0 0                
Liabilities [Abstract]                                  
Foreign currency forward contracts 0.1   0.3 0 0 0.1 0.3 0 0                
Total Liabilities $ 0.1   $ 0.3 $ 0 $ 0 $ 0.1 $ 0.3 $ 0 $ 0