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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets:            
Marketable debt securities $ 1,720.6   $ 1,245.9      
Fair Value, Measurements, Recurring
            
Assets:            
Cash equivalents 475.2   424.7      
Derivative contracts 2.1   3.8      
Plan assets for deferred compensation 37.0   22.7      
Total 2,256.4   1,730.2      
Liabilities:            
Derivative contracts 9.1   23.5      
Contingent consideration obligations 279.1 275.1 280.9 281.0 293.7 293.9
Total 288.2   304.4      
Fair Value, Measurements, Recurring | Corporate debt securities
            
Assets:            
Marketable debt securities 617.2   439.8      
Fair Value, Measurements, Recurring | Government securities
            
Assets:            
Marketable debt securities 948.0   674.7      
Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
            
Assets:            
Marketable debt securities 155.4   131.4      
Fair Value, Measurements, Recurring | Marketable equity securities
            
Assets:            
Investments 0.4   11.2      
Fair Value, Measurements, Recurring | Venture capital investments
            
Assets:            
Investments 21.1 23.6 21.9 23.5 18.0 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 0.4   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 0.4   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 475.2   424.7      
Derivative contracts 2.1   3.8      
Plan assets for deferred compensation 37.0   22.7      
Total 2,234.9   1,697.1      
Liabilities:            
Derivative contracts 9.1   23.5      
Contingent consideration obligations 0   0      
Total 9.1   23.5      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate debt securities
            
Assets:            
Marketable debt securities 617.2   439.8      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government securities
            
Assets:            
Marketable debt securities 948.0   674.7      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
            
Assets:            
Marketable debt securities 155.4   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 21.1   21.9      
Liabilities:            
Derivative contracts 0   0      
Contingent consideration obligations 279.1   280.9      
Total 279.1   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 $ 21.1   $ 21.9