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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Liabilities:      
Contingent consideration obligations $ 293.9 $ 151.0 $ 81.2
Fair Value, Measurements, Recurring
      
Assets:      
Cash equivalents 439.4 399.8  
Derivative contracts 1.8 39.5  
Plan assets for deferred compensation 14.3 11.6  
Total 3,656.5 3,067.4  
Liabilities:      
Derivative contracts 14.4 0.5  
Contingent consideration obligations 293.9 151.0  
Total 308.3 151.5  
Fair Value, Measurements, Recurring | Corporate debt securities
      
Assets:      
Investments, fair value disclosure 1,001.0 602.6  
Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Investments, fair value disclosure 1,657.8 1,716.5  
Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Investments, fair value disclosure 512.9 273.8  
Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments, fair value disclosure 9.0 0.1  
Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments, fair value disclosure 20.3 23.5  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring
      
Assets:      
Cash equivalents 0 0  
Derivative contracts 0 0  
Plan assets for deferred compensation 0 0  
Total 9.0 0.1  
Liabilities:      
Derivative contracts 0 0  
Contingent consideration obligations 0 0  
Total 0 0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Corporate debt securities
      
Assets:      
Investments, fair value disclosure 0 0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Investments, fair value disclosure 0 0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Investments, fair value disclosure 0 0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments, fair value disclosure 9.0 0.1  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments, fair value disclosure 0 0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
      
Assets:      
Cash equivalents 439.4 399.8  
Derivative contracts 1.8 39.5  
Plan assets for deferred compensation 14.3 11.6  
Total 3,627.2 3,043.8  
Liabilities:      
Derivative contracts 14.4 0.5  
Contingent consideration obligations 0 0  
Total 14.4 0.5  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate debt securities
      
Assets:      
Investments, fair value disclosure 1,001.0 602.6  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Investments, fair value disclosure 1,657.8 1,716.5  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Investments, fair value disclosure 512.9 273.8  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments, fair value disclosure 0 0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments, fair value disclosure 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
      
Assets:      
Cash equivalents 0 0  
Derivative contracts 0 0  
Plan assets for deferred compensation 0 0  
Total 20.3 23.5  
Liabilities:      
Derivative contracts 0 0  
Contingent consideration obligations 293.9 151.0  
Total 293.9 151.0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate debt securities
      
Assets:      
Investments, fair value disclosure 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Investments, fair value disclosure 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Investments, fair value disclosure 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments, fair value disclosure 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments, fair value disclosure $ 20.3 $ 23.5