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Derivative Financial Instruments and Fair Value Measurements (Details)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2011
USD ($)
Dec. 31, 2011
USD ($)
Sep. 30, 2012
Recurring Basis [Member]
USD ($)
Dec. 31, 2011
Recurring Basis [Member]
USD ($)
Sep. 30, 2012
Recurring Basis [Member]
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
USD ($)
Dec. 31, 2011
Recurring Basis [Member]
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
USD ($)
Sep. 30, 2012
Recurring Basis [Member]
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Dec. 31, 2011
Recurring Basis [Member]
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2012
Recurring Basis [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Dec. 31, 2011
Recurring Basis [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2012
Euro-denominated Note EUR350 [Member]
USD ($)
Sep. 30, 2012
Euro-denominated Note EUR350 [Member]
EUR (€)
Sep. 30, 2012
Euro-denominated Note EUR200 [Member]
USD ($)
Sep. 30, 2012
Euro-denominated Note EUR200 [Member]
EUR (€)
Sep. 30, 2012
Carrying Amount [Member]
Euro-denominated Notes Total [Member]
USD ($)
Dec. 31, 2011
Carrying Amount [Member]
Euro-denominated Notes Total [Member]
USD ($)
Sep. 30, 2012
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Euro-denominated Notes Total [Member]
USD ($)
Dec. 31, 2011
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Euro-denominated Notes Total [Member]
USD ($)
Net investment hedges [Abstract]                                          
Long-term Debt                           $ 450.0 € 350.0 $ 257.0 € 200.0 $ 707.0 $ 647.6 $ 739.6 $ 654.9
Unrealized loss from economic hedges included in Accumulated Other Comprehensive Income, net of taxes 39.3   39.3   43.2                                
Gain associated with forward contracts included in Interest and Other Expenses 0.4 0 0.8 0                                  
Assets [Abstract]                                          
Available-for-sale securities           0.4 0.4 0.4 0.4 0 0 0 0                
Foreign currency forward contracts           0.5 0 0 0 0.5 0 0 0                
Deferred compensation plan assets           57.2 45.2 57.2 45.2 0 0 0 0                
Total assets           58.1 45.6 57.6 45.6 0.5 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