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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets:        
Marketable debt securities $ 1,155.8 $ 1,245.9    
Fair Value, Measurements, Recurring
        
Assets:        
Cash equivalents 236.1 424.7    
Derivative contracts 2.6 3.8    
Plan assets for deferred compensation 32.9 22.7    
Total 1,464.8 1,730.2    
Liabilities:        
Derivative contracts 19.1 23.5    
Contingent consideration obligations 275.1 280.9 293.7 293.9
Total 294.2 304.4    
Fair Value, Measurements, Recurring | Corporate debt securities
        
Assets:        
Marketable debt securities 536.9 439.8    
Fair Value, Measurements, Recurring | Government securities
        
Assets:        
Marketable debt securities 466.7 674.7    
Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
        
Assets:        
Marketable debt securities 152.2 131.4    
Fair Value, Measurements, Recurring | Marketable equity securities
        
Assets:        
Investments 13.8 11.2    
Fair Value, Measurements, Recurring | Venture capital investments
        
Assets:        
Investments 23.6 21.9 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 13.8 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 13.8 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 236.1 424.7    
Derivative contracts 2.6 3.8    
Plan assets for deferred compensation 32.9 22.7    
Total 1,427.4 1,697.1    
Liabilities:        
Derivative contracts 19.1 23.5    
Contingent consideration obligations 0 0    
Total 19.1 23.5    
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate debt securities
        
Assets:        
Marketable debt securities 536.9 439.8    
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government securities
        
Assets:        
Marketable debt securities 466.7 674.7    
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities
        
Assets:        
Marketable debt securities 152.2 131.4    
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 23.6 21.9    
Liabilities:        
Derivative contracts 0 0    
Contingent consideration obligations 275.1 280.9    
Total 275.1 280.9    
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 $ 23.6 $ 21.9