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Fair Value Measurements - Summary of Assets and Liabilities Recorded at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets:      
Fair Value $ 2,051.0 $ 2,970.3  
Fair value, measurements, recurring      
Assets:      
Cash equivalents 626.9 2,541.1  
Marketable equity securities 1,974.3 337.5  
Derivative contracts 20.5 43.8  
Plan assets for deferred compensation 28.2 27.7  
Total 4,700.9 5,920.4  
Liabilities:      
Derivative contracts 217.2 8.3  
Contingent consideration obligations 259.8 346.1 $ 409.8
Total 477.0 354.4  
Fair value, measurements, recurring | Corporate debt securities      
Assets:      
Fair Value 1,301.5 1,695.1  
Fair value, measurements, recurring | Government securities      
Assets:      
Fair Value 627.1 1,013.9  
Fair value, measurements, recurring | Mortgage and other asset backed securities      
Assets:      
Fair Value 122.4 261.3  
Quoted Prices in Active Markets (Level 1) | Fair value, measurements, recurring      
Assets:      
Cash equivalents 0.0 0.0  
Marketable equity securities 271.1 7.9  
Derivative contracts 0.0 0.0  
Plan assets for deferred compensation 0.0 0.0  
Total 271.1 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:      
Fair Value 0.0 0.0  
Quoted Prices in Active Markets (Level 1) | Fair value, measurements, recurring | Government securities      
Assets:      
Fair Value 0.0 0.0  
Quoted Prices in Active Markets (Level 1) | Fair value, measurements, recurring | Mortgage and other asset backed securities      
Assets:      
Fair Value 0.0 0.0  
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring      
Assets:      
Cash equivalents 626.9 2,541.1  
Marketable equity securities 1,703.2 329.6  
Derivative contracts 20.5 43.8  
Plan assets for deferred compensation 28.2 27.7  
Total 4,429.8 5,912.5  
Liabilities:      
Derivative contracts 217.2 8.3  
Contingent consideration obligations 0.0 0.0  
Total 217.2 8.3  
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring | Corporate debt securities      
Assets:      
Fair Value 1,301.5 1,695.1  
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring | Government securities      
Assets:      
Fair Value 627.1 1,013.9  
Significant Other Observable Inputs (Level 2) | Fair value, measurements, recurring | Mortgage and other asset backed securities      
Assets:      
Fair Value 122.4 261.3  
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 259.8 346.1  
Total 259.8 346.1  
Significant Unobservable Inputs (Level 3) | Fair value, measurements, recurring | Corporate debt securities      
Assets:      
Fair Value 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fair value, measurements, recurring | Government securities      
Assets:      
Fair Value 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fair value, measurements, recurring | Mortgage and other asset backed securities      
Assets:      
Fair Value $ 0.0 $ 0.0