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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets:      
Marketable debt securities $ 1,245.9 $ 3,171.7  
Fair Value, Measurements, Recurring
      
Assets:      
Cash equivalents 424.7 439.4  
Derivative contracts 3.8 1.8  
Plan assets for deferred compensation 22.7 14.3  
Total 1,730.2 3,656.5  
Liabilities:      
Derivative contracts 23.5 14.4  
Contingent consideration obligations 280.9 293.9 151.0
Total 304.4 308.3  
Fair Value, Measurements, Recurring | Corporate debt securities
      
Assets:      
Marketable debt securities 439.8 1,001.0  
Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Marketable debt securities 674.7 1,657.8  
Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Marketable debt securities 131.4 512.9  
Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments 11.2 9.0  
Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments 21.9 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 11.2 9.0  
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:      
Marketable debt securities 0 0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Marketable debt securities 0 0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Marketable debt securities 0 0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments 11.2 9.0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments 0 0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
      
Assets:      
Cash equivalents 424.7 439.4  
Derivative contracts 3.8 1.8  
Plan assets for deferred compensation 22.7 14.3  
Total 1,697.1 3,627.2  
Liabilities:      
Derivative contracts 23.5 14.4  
Contingent consideration obligations 0 0  
Total 23.5 14.4  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate debt securities
      
Assets:      
Marketable debt securities 439.8 1,001.0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Marketable debt securities 674.7 1,657.8  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Marketable debt securities 131.4 512.9  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments 0 0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments 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 21.9 20.3  
Liabilities:      
Derivative contracts 0 0  
Contingent consideration obligations 280.9 293.9  
Total 280.9 293.9  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate debt securities
      
Assets:      
Marketable debt securities 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Government securities
      
Assets:      
Marketable debt securities 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
      
Assets:      
Marketable debt securities 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Marketable equity securities
      
Assets:      
Investments 0 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Venture capital investments
      
Assets:      
Investments $ 21.9 $ 20.3