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Fair Value Measurements - Summary of Assets and Liabilities Recorded at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Feb. 29, 2012
Assets:        
Marketable debt securities   $ 2,179.2    
Samsung Bioepis        
Liabilities:        
Ownership percentage     49.90% 15.00%
Fair value, measurements, recurring        
Assets:        
Cash equivalents $ 610.7 2,847.6    
Marketable equity securities 416.8 791.1    
Derivative contracts 11.9 63.0    
Plan assets for deferred compensation 37.5 32.8    
Total 1,506.9 7,117.9    
Liabilities:        
Derivative contracts 31.6 26.0    
Total 31.6 26.0    
Fair value, measurements, recurring | Samsung Bioepis        
Assets:        
Receivable from Samsung BioLogics 430.0 798.8    
Receivable from Samsung BioLogics   405.4    
Fair value, measurements, recurring | Corporate debt securities        
Assets:        
Marketable debt securities   1,231.6    
Fair value, measurements, recurring | Government securities        
Assets:        
Marketable debt securities   810.3    
Fair value, measurements, recurring | Mortgage and other asset backed securities        
Assets:        
Marketable debt securities   137.3    
Quoted Prices in Active Markets (Level 1) | Fair value, measurements, recurring        
Assets:        
Cash equivalents 0.0 0.0    
Marketable equity securities 416.8 791.1    
Derivative contracts 0.0 0.0    
Plan assets for deferred compensation 0.0 0.0    
Total 416.8 791.1    
Liabilities:        
Derivative contracts 0.0 0.0    
Total 0.0 0.0    
Quoted Prices in Active Markets (Level 1) | Fair value, measurements, recurring | Samsung Bioepis        
Assets:        
Receivable from Samsung BioLogics 0.0 0.0    
Receivable from Samsung BioLogics   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    
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring        
Assets:        
Cash equivalents 610.7 2,847.6    
Marketable equity securities 0.0 0.0    
Derivative contracts 11.9 63.0    
Plan assets for deferred compensation 37.5 32.8    
Total 660.1 5,122.6    
Liabilities:        
Derivative contracts 31.6 26.0    
Total 31.6 26.0    
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring | Samsung Bioepis        
Assets:        
Receivable from Samsung BioLogics 0.0 0.0    
Receivable from Samsung BioLogics   0.0    
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring | Corporate debt securities        
Assets:        
Marketable debt securities   1,231.6    
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring | Government securities        
Assets:        
Marketable debt securities   810.3    
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring | Mortgage and other asset backed securities        
Assets:        
Marketable debt securities   137.3    
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 430.0 1,204.2    
Liabilities:        
Derivative contracts 0.0 0.0    
Total 0.0 0.0    
Significant Unobservable Inputs (Level 3) | Fair value, measurements, recurring | Samsung Bioepis        
Assets:        
Receivable from Samsung BioLogics $ 430.0 798.8    
Receivable from Samsung BioLogics   405.4    
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