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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Assets:            
Marketable debt securities $ 2,046.4   $ 1,245.9      
Fair Value, Measurements, Recurring
            
Assets:            
Cash equivalents 663.3   424.7      
Derivative contracts 42.9   3.8      
Plan assets for deferred compensation 35.2   22.7      
Total 2,805.2   1,730.2      
Liabilities:            
Derivative contracts 6.8   23.5      
Contingent consideration obligations 213.2 279.1 280.9 281.0 281.0 293.9
Total 220.0   304.4      
Fair Value, Measurements, Recurring | Corporate debt securities
            
Assets:            
Marketable debt securities 774.4   439.8      
Fair Value, Measurements, Recurring | Government securities
            
Assets:            
Marketable debt securities 1,085.0   674.7      
Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
            
Assets:            
Marketable debt securities 187.0   131.4      
Fair Value, Measurements, Recurring | Marketable equity securities
            
Assets:            
Investments 0.7   11.2      
Fair Value, Measurements, Recurring | Venture capital investments
            
Assets:            
Investments 16.7 21.1 21.9 27.6 23.5 20.3
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 0.7   11.2      
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 0.7   11.2      
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 663.3   424.7      
Derivative contracts 42.9   3.8      
Plan assets for deferred compensation 35.2   22.7      
Total 2,787.8   1,697.1      
Liabilities:            
Derivative contracts 6.8   23.5      
Contingent consideration obligations 0   0      
Total 6.8   23.5      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate debt securities
            
Assets:            
Marketable debt securities 774.4   439.8      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government securities
            
Assets:            
Marketable debt securities 1,085.0   674.7      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
            
Assets:            
Marketable debt securities 187.0   131.4      
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 16.7   21.9      
Liabilities:            
Derivative contracts 0   0      
Contingent consideration obligations 213.2   280.9      
Total 213.2   280.9      
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 $ 16.7   $ 21.9