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Derivative Financial Instruments and Fair Value Measurements (Details)
In Millions
6 Months Ended
Jun. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
Jun. 30, 2011
Carrying Amount [Member]
USD ($)
Dec. 31, 2010
Carrying Amount [Member]
USD ($)
Jun. 30, 2011
Carrying Amount [Member]
Euro-denominated Note EUR200 [Member]
EUR (€)
Jun. 30, 2011
Carrying Amount [Member]
Euro-denominated Note EUR200 [Member]
USD ($)
Jun. 30, 2011
Fair Value [Member]
USD ($)
Dec. 31, 2010
Fair Value [Member]
USD ($)
Jun. 30, 2011
Euro-denominated Note EUR300 [Member]
USD ($)
Jun. 30, 2011
Euro-denominated Note EUR300 [Member]
EUR (€)
Jun. 30, 2011
Recurring Basis [Member]
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
USD ($)
Dec. 31, 2010
Recurring Basis [Member]
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Recurring Basis [Member]
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Dec. 31, 2010
Recurring Basis [Member]
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Recurring Basis [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Dec. 31, 2010
Recurring Basis [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Net investment hedges [Abstract]                                
Long-term Debt     $ 724.4 $ 668.3 € 200.0 $ 289.6 $ 740.9 $ 686.3 $ 434.8 € 300.0            
Gain/(Loss) from economic hedges included in Accumulated Other Comprehensive Income, net of taxes 90.3                              
Assets [Abstract]                                
Available-for-sale securities 0.4 0.4                 0.4 0.4 0 0 0 0
Foreign currency forward contracts 0 0.1                 0 0 0 0.1 0 0
Deferred compensation plan assets 46.3 40.3                 46.3 40.3 0 0 0 0
Total assets $ 46.7 $ 40.8                 $ 46.7 $ 40.7 $ 0 $ 0.1 $ 0 $ 0