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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Assets:            
Marketable debt securities $ 3,907.4   $ 3,689.3      
Fair Value, Measurements, Recurring            
Assets:            
Cash equivalents 1,655.8   705.5      
Marketable equity securities 336.7   615.4      
Derivative contracts 161.7   66.9      
Plan assets for deferred compensation 26.3   25.4      
Total 6,087.9   5,102.5      
Liabilities:            
Derivative contracts 9.8   24.6      
Contingent consideration obligations 343.5 $ 401.3 409.8 $ 412.0 $ 499.9 $ 523.6
Total 353.3   434.4      
Fair Value, Measurements, Recurring | Corporate debt securities            
Assets:            
Marketable debt securities 2,702.2   2,459.2      
Fair Value, Measurements, Recurring | Government securities            
Assets:            
Marketable debt securities 868.2   969.6      
Fair Value, Measurements, Recurring | Mortgage and other asset backed securities            
Assets:            
Marketable debt securities 337.0   260.5      
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring            
Assets:            
Cash equivalents 0.0   0.0      
Marketable equity securities 18.5   51.7      
Derivative contracts 0.0   0.0      
Plan assets for deferred compensation 0.0   0.0      
Total 18.5   51.7      
Liabilities:            
Derivative contracts 0.0   0.0      
Contingent consideration obligations 0.0   0.0      
Total 0.0   0.0      
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Corporate debt securities            
Assets:            
Marketable debt securities 0.0   0.0      
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring | Government securities            
Assets:            
Marketable debt securities 0.0   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   0.0      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring            
Assets:            
Cash equivalents 1,655.8   705.5      
Marketable equity securities 318.2   563.7      
Derivative contracts 161.7   66.9      
Plan assets for deferred compensation 26.3   25.4      
Total 6,069.4   5,050.8      
Liabilities:            
Derivative contracts 9.8   24.6      
Contingent consideration obligations 0.0   0.0      
Total 9.8   24.6      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate debt securities            
Assets:            
Marketable debt securities 2,702.2   2,459.2      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government securities            
Assets:            
Marketable debt securities 868.2   969.6      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities            
Assets:            
Marketable debt securities 337.0   260.5      
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring            
Assets:            
Cash equivalents 0.0   0.0      
Marketable equity securities 0.0   0.0      
Derivative contracts 0.0   0.0      
Plan assets for deferred compensation 0.0   0.0      
Total 0.0   0.0      
Liabilities:            
Derivative contracts 0.0   0.0      
Contingent consideration obligations 343.5   409.8      
Total 343.5   409.8      
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate debt securities            
Assets:            
Marketable debt securities 0.0   0.0      
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Government securities            
Assets:            
Marketable debt securities 0.0   0.0      
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities            
Assets:            
Marketable debt securities $ 0.0   $ 0.0