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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Assets:            
Marketable debt securities $ 2,364.8   $ 2,970.3      
Fair Value, Measurements, Recurring            
Assets:            
Cash equivalents 1,570.3   2,541.1      
Marketable equity securities 868.5   337.5      
Derivative contracts 26.0   43.8      
Plan assets for deferred compensation 26.4   27.7      
Total 4,856.0   5,920.4      
Liabilities:            
Derivative contracts 99.6   8.3      
Contingent consideration obligations 322.6 $ 351.6 346.1 $ 343.5 $ 401.3 $ 409.8
Total 422.2   354.4      
Fair Value, Measurements, Recurring | Corporate debt securities            
Assets:            
Marketable debt securities 1,443.8   1,695.1      
Fair Value, Measurements, Recurring | Government securities            
Assets:            
Marketable debt securities 767.4   1,013.9      
Fair Value, Measurements, Recurring | Mortgage and other asset backed securities            
Assets:            
Marketable debt securities 153.6   261.3      
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring            
Assets:            
Cash equivalents 0.0   0.0      
Marketable equity securities 276.5   7.9      
Derivative contracts 0.0   0.0      
Plan assets for deferred compensation 0.0   0.0      
Total 276.5   7.9      
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 1,570.3   2,541.1      
Marketable equity securities 592.0   329.6      
Derivative contracts 26.0   43.8      
Plan assets for deferred compensation 26.4   27.7      
Total 4,579.5   5,912.5      
Liabilities:            
Derivative contracts 99.6   8.3      
Contingent consideration obligations 0.0   0.0      
Total 99.6   8.3      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate debt securities            
Assets:            
Marketable debt securities 1,443.8   1,695.1      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government securities            
Assets:            
Marketable debt securities 767.4   1,013.9      
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage and other asset backed securities            
Assets:            
Marketable debt securities 153.6   261.3      
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 322.6   346.1      
Total 322.6   346.1      
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